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LT1809/LT1810 Single/Dual 180MHz, 350V/s Rail-to-Rail Input and Output Low Distortion Op Amps
FEATURES
s s s s s s s s s s s s s s s s
DESCRIPTIO
-3dB Bandwidth: 320MHz, AV = 1 Gain-Bandwidth Product: 180MHz, AV 10 Slew Rate: 350V/s Wide Supply Range: 2.5V to 12.6V Large Output Current: 85mA Low Distortion, 5MHz: - 90dBc Input Common Mode Range Includes Both Rails Output Swings Rail-to-Rail Input Offset Voltage, Rail-to-Rail: 2.5mV Max Common Mode Rejection: 89dB Typ Power Supply Rejection: 87dB Typ Open-Loop Gain: 100V/mV Typ Shutdown Pin: LT1809 Single in 8-Pin SO and 6-Pin SOT-23 Packages Dual in 8-Pin SO and MSOP Packages Operating Temperature Range: - 40C to 85C
The LT(R)1809/LT1810 are single/dual low distortion railto-rail input and output op amps with a 350V/s slew rate. These amplifiers have a -3dB bandwidth of 320MHz at unity-gain, a gain-bandwidth product of 180MHz (AV 10) and an 85mA output current to fit the needs of low voltage, high performance signal conditioning systems. The LT1809/LT1810 have an input range that includes both supply rails and an output that swings within 20mV of either supply rail to maximize the signal dynamic range in low supply applications. The LT1809/LT1810 have very low distortion (-90dBc) up to 5MHz that allows them to be used in high performance data acquisition systems. The LT1809/LT1810 maintain their performance for supplies from 2.5V to 12.6V and are specified at 3V, 5V and 5V supplies. The inputs can be driven beyond the supplies without damage or phase reversal of the output. The LT1809 is available in the 8-pin SO package with the standard op amp pinout and the 6-pin SOT-23 package. The LT1810 features the standard dual op amp pinout and is available in 8-pin SO and MSOP packages. These devices can be used as a plug-in replacement for many op amps to improve input/output range and performance.
APPLICATIO S
s s s s s
Driving A/D Converters Low Voltage Signal Processing Active Filters Rail-to-Rail Buffer Amplifiers Video Line Driver
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Distortion vs Frequency
-40 -50 -60 -70 -80 -90 RL = 100, 3RD -100
1809 TA01
High Speed ADC Driver
5V 5V VIN 1VP-P
AV = +1 VIN = 2VP-P VS = 5V
DISTORTION (dB)
+
LT1809
R3 49.9 +AIN C1 470pF -5V R2 1k -AIN
-
LTC(R)1420 PGA GAIN = 1 REF = 2.048V
* * *
12 BITS 10Msps
-5V R1 1k
-110 0.3
U
RL = 100, 2ND RL = 1k, 3RD RL = 1k, 2ND 1 FREQUENCY (MHz)
1809 TA02
U
U
10
30
1
LT1809/LT1810
ABSOLUTE
AXI U
RATI GS
Total Supply Voltage (V + to V -) ........................... 12.6V Input Voltage (Note 2) .............................................. VS Input Current (Note 2) ........................................ 10mA Output Short-Circuit Duration (Note 3) ............ Indefinite Operating Temperature Range (Note 4) .. - 40C to 85C
PACKAGE/ORDER I FOR ATIO
TOP VIEW OUT 1 V- 2 +IN 3 6 V+ 5 SHDN 4 -IN
ORDER PART NUMBER
SHDN 1
LT1809CS6 LT1809IS6 S6 PART MARKING LTKY LTUF ORDER PART NUMBER
S6 PACKAGE 6-LEAD PLASTIC SOT-23
TJMAX = 150C, JA = 145C/W (Note 9)
TOP VIEW OUT A -IN A +IN A V- 1 2 3 4 8 7 6 5 V+ OUT B -IN B +IN B
LT1810CMS8 LT1810IMS8 MS8 PART MARKING LTRF LTTQ
MS8 PACKAGE 8-LEAD PLASTIC MSOP
TJMAX = 150C, JA = 130C/W (Note 9)
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
TA = 25C. VS = 5V, 0V; VS = 3V, 0V; VSHDN = open; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM = V + LT1809 SO-8 VCM = V - LT1809 SO-8 VCM = V + VCM = V - VCM = V - to V + LT1809 SO-8 VCM = V - to V + VCM = V + VCM = V - + 0.2V VCM = V - + 0.2V to V + VCM = V + VCM = V - + 0.2V MIN TYP 0.6 0.6 0.6 0.6 0.3 0.3 0.7 - 27.5 1.8 -13 14.8 0.1 0.2 MAX 2.5 2.5 3.0 3.0 2.0 2.5 6 8 35.5 4 8 UNITS mV mV mV mV mV mV mV A A A A A
VOS
Input Offset Shift Input Offset Voltage Match (Channel-to-Channel) (Note 10)
IB IB
Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) (Note 10)
2
U
U
W
WW U
W
(Note 1)
Specified Temperature Range (Note 5) ... - 40C to 85C Junction Temperature ........................................... 150C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
TOP VIEW 8 - + 7 6 5 NC V+ OUT NC
ORDER PART NUMBER LT1809CS8 LT1809IS8 S8 PART MARKING 1809 1809I ORDER PART NUMBER LT1810CS8 LT1810IS8 S8 PART MARKING 1810 1810I
-IN 2 +IN 3 V- 4
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 100C/W (Note 9)
TOP VIEW OUT A 1 -IN A 2 +IN A 3 V- 4 B 5 +IN B A 8 V+ 7 OUT B 6 -IN B
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150C, JA = 100C/W (Note 9)
LT1809/LT1810
ELECTRICAL CHARACTERISTICS
TA = 25C. VS = 5V, 0V; VS = 3V, 0V; VSHDN = open; VCM = VOUT = half supply, unless otherwise noted.
SYMBOL PARAMETER IOS IOS en in CIN AVOL Input Offset Current Input Offset Current Shift Input Noise Voltage Density Input Noise Current Density Input Capacitance Large-Signal Voltage Gain VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2 VS = 5V, VO = 1V to 4V, RL = 100 to VS/2 VS = 3V, VO = 0.5V to 2.5V, RL = 1k to VS/2 VS = 5V, VCM = V - to V + VS = 3V, VCM = V - to V + VS = 5V, VCM = V - to V + VS = 3V, VCM = V - to V + VS = 2.5V to 10V, VCM = 0V VS = 2.5V to 10V, VCM = 0V No Load ISINK = 5mA ISINK = 25mA No Load ISOURCE = 5mA ISOURCE = 25mA VS = 5V VS = 3V VS = 5V, VSHDN = 0.3V VS = 3V, VSHDN = 0.3V VS = 5V, VSHDN = 0.3V VS = 3V, VSHDN = 0.3V VSHDN = 0.3V VS - 0.5 VSHDN = 0.3V to 4.5V, RL = 100 VSHDN = 4.5V to 0.3V, RL = 100 Frequency = 2MHz VS = 5V, AV = -1, RL = 1k, VO = 4VP-P VS = 5V, VOUT = 4VP-P VS = 5V, AV = 1, RL = 1k, VO = 2VP-P, fC = 5MHz 0.1%, VS = 5V, VSTEP = 2V, AV = - 1, RL = 500 VS = 5V, AV = 2, RL = 150 VS = 5V, AV = 2, RL = 150 80 50 160 300 23.5 - 86 27 0.015 0.05 45 35 25 4 15 66 61 60 55 V- 71 65 87 87 2.3 12 50 180 20 80 330 85 70 12.5 0.55 0.31 420 220 0.1 17 1.25 0.90 750 500 75 0.3 2.5 50 120 375 80 180 650 CONDITIONS VCM VCM = V - + 0.2V VCM = V - + 0.2V to V + f = 10kHz f = 10kHz = V+ MIN TYP 0.05 0.2 0.25 16 5 2 80 10 42 82 78 82 78 V+ MAX 1.2 4 5.2 UNITS A A A nV/Hz pA/Hz pF V/mV V/mV V/mV dB dB dB dB V dB dB V mV mV mV mV mV mV mA mA mA mA mA A A A V V ns ns MHz V/s MHz dB ns % Deg
CMRR
Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 10) Input Common Mode Range
PSRR
Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 10) Minimum Supply Voltage (Note 6)
VOL
Output Voltage Swing LOW (Note 7)
VOH
Output Voltage Swing HIGH (Note 7)
ISC IS
Short-Circuit Current Supply Current per Amplifier Supply Current, Shutdown
ISHDN
SHDN Pin Current Output Leakage Current, Shutdown
VL VH tON tOFF GBW SR FPBW THD tS G
SHDN Pin Input Voltage Low SHDN Pin Input Voltage High Turn-On Time Turn-Off Time Gain-Bandwidth Product Slew Rate Full Power Bandwidth Total Harmonic Distortion Settling Time Differential Gain (NTSC) Differential Phase (NTSC)
3
LT1809/LT1810
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER VOS Input Offset Voltage
The q denotes the specifications which apply over the 0C TA 70C temperature range. VS = 5V, 0V; VS = 3V, 0V; VSHDN = open; VCM = VOUT = half supply, unless otherwise noted.
CONDITIONS VCM = V + LT1809 SO-8 VCM = V - LT1809 SO-8 VCM = V + VCM = V - VCM = V + VCM = V - VCM = V - to V + LT1809 SO-8 VCM = V - to V + VCM = V -, VCM = V + VCM = V + - 0.2V VCM = V - + 0.4V VCM = V - + 0.4V to V + - 0.2V VCM = V + - 0.2V VCM = V - + 0.4V VCM = V + - 0.2V VCM = V - + 0.4V VCM = V - + 0.4V to V + - 0.2V VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2 VS = 5V, VO = 1V to 4V, RL = 100 to VS/2 VS = 3V, VO = 0.5V to 2.5V, RL = 1k to VS/2 VS = 5V, VCM = V - to V + VS = 3V, VCM = V - to V + VS = 5V, VCM = V -, VCM = V + VS = 3V, VCM = V -, VCM = V + VS = 2.5V to 10V, VCM = 0V VS = 2.5V to 10V, VCM = 0V No Load ISINK = 5mA ISINK = 25mA No Load ISOURCE = 5mA ISOURCE = 25mA VS = 5V VS = 3V VS = 5V, VSHDN = 0.3V VS = 3V, VSHDN = 0.3V VS = 5V, VSHDN = 0.3V VS = 3V, VSHDN = 0.3V VSHDN = 0.3V
q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q VS - 0.5
MIN
TYP 1 1 1 1 9 9 0.5 0.5 1.2 2 -14 16 0.1 0.5 0.05 0.40 0.45
MAX 3.0 3.0 3.5 3.5 25 25 2.5 3.0 6.5 10 40 5 10 1.5 4.5 6
UNITS mV mV mV mV V/C V/C mV mV mV A A A A A A A A V/mV V/mV V/mV dB dB dB dB
VOS TC VOS
Input Offset Voltage Drift (Note 8) Input Offset Voltage Shift Input Offset Voltage Match (Channel-to-Channel) (Note 10)
IB IB
Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) (Note 10)
- 30
IOS IOS AVOL
Input Offset Current Input Offset Current Shift Large-Signal Voltage Gain
20 3.5 12 64 60 58 54 V- 70 64
75 8.5 40 80 75 80 75 V+ 83 83 2.3 12 55 200 50 110 370 2.5 60 140 400 120 220 700
CMRR
Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 10) Input Common Mode Range
V dB dB V mV mV mV mV mV mV mA mA
PSRR
Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 10) Minimum Supply Voltage (Note 6)
VOL
Output Voltage Swing LOW (Note 7)
VOH
Output Voltage Swing HIGH (Note 7)
ISC IS
Short-Circuit Current Supply Current per Amplifier Supply Current, Shutdown
40 30
75 65 15 0.58 0.35 420 220 2 0.3 20 1.4 1.1 850 550
mA mA mA A A A V V
ISHDN
SHDN Pin Current Output Leakage Current, Shutdown
VL VH
SHDN Pin Input Voltage Low SHDN Pin Input Voltage High
4
LT1809/LT1810
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER tON tOFF GBW SR FPBW Turn-On Time Turn-Off Time Gain-Bandwidth Product Slew Rate Full Power Bandwidth
The q denotes the specifications which apply over the 0C TA 70C temperature range. VS = 5V, 0V; VS = 3V, 0V; VSHDN = open; VCM = VOUT = half supply, unless otherwise noted.
CONDITIONS VSHDN = 0.3V to 4.5V, RL = 100 VSHDN = 4.5V to 0.3V, RL = 100 Frequency = 2MHz VS = 5V, AV = -1, RL = 1k, VO = 4VP-P VS = 5V, VOUT = 4VP-P
q q q q q
MIN
TYP 80 50 145 250 20
MAX
UNITS ns ns MHz V/s MHz
The q denotes the specifications which apply over the - 40C TA 85C temperature range. VS = 5V, 0V; VS = 3V, 0V; VSHDN = open; VCM = VOUT = half supply, unless otherwise noted. (Note 5)
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM = V + LT1809 SO-8 VCM = V - LT1809 SO-8 VCM = V + VCM = V - VCM = V + VCM = V - VCM = V - to V+ LT1809 SO-8 VCM = V - VCM = V +, VCM = V - VCM = V + - 0.2V VCM = V - + 0.4V VCM = V - + 0.4V to V + - 0.2V VCM = V + VCM = V - VCM = V + VCM = V - VCM = V - - 0.2V + 0.4V - 0.2V + 0.4V + 0.4V to V + - 0.2V
q q q q q q q q q q q q q q q q q q q q q q q q q
MIN
TYP 1 1 1 1 9 9 0.5 0.5 1.2 2 -17 19 0.2 0.6 0.08 0.5 0.58
MAX 3.5 3.5 4.0 4.0 25 25 3.0 3.5 7 12 47 6 12 2 6 7.5
UNITS mV mV mV mV V/C V/C mV mV mV A A A A A A A A V/mV V/mV V/mV dB dB dB dB
VOS TC VOS
Input Offset Voltage Drift (Note 8) Input Offset Voltage Shift Input Offset Voltage Match (Channel-to-Channel) (Note 10)
IB IB
Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) (Note 10)
- 35
IOS IOS AVOL
Input Offset Current Input Offset Current Shift Large-Signal Voltage Gain
VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2 VS = 5V, VO = 1V to 4V, RL = 100 to VS/2 VS = 3V, VO = 0.5V to 2.5V, RL = 1k to VS/2 VS = 5V, VCM = V - to V + VS = 3V, VCM = V - to V + VS = 5V, VCM = V - to V + VS = 3V, VCM = V - to V + VS = 2.5V to 10V, VCM = 0V VS = 2.5V to 10V, VCM = 0V No Load ISINK = 5mA ISINK = 25mA No Load ISOURCE = 5mA ISOURCE = 25mA VS = 5V VS = 3V VS = 5V, VSHDN = 0.3V VS = 3V, VSHDN = 0.3V
17 2.5 10 63 58 57 52 V- 69 63
60 7 35 80 75 78 72 V+ 83 83 2.3 18 60 210 55 120 375 2.5 70 150 450 130 240 750
CMRR
Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 10) Input Common Mode Range
V dB dB V mV mV mV mV mV mV mA mA
PSRR
Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 10) Minimum Supply Voltage (Note 6)
q q q q q q q q q q q q q q
VOL
Output Voltage Swing LOW (Note 7)
VOH
Output Voltage Swing HIGH (Note 7)
ISC IS
Short-Circuit Current Supply Current per Amplifier Supply Current, Shutdown
30 25
70 60 15 0.58 0.35 21 1.5 1.2
mA mA mA
5
LT1809/LT1810
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER ISHDN SHDN Pin Current Output Leakage Current, Shutdown VL VH tON tOFF GBW SR FPBW SHDN Pin Input Voltage Low SHDN Pin Input Voltage High Turn-On Time Turn-Off Time Gain-Bandwidth Product Slew Rate Full Power Bandwidth
The q denotes the specifications which apply over the - 40C TA 85C temperature range. VS = 5V, 0V; VS = 3V, 0V; VSHDN = open; VCM = VOUT = half supply, unless otherwise noted. (Note 5)
CONDITIONS VS = 5V, VSHDN = 0.3V VS = 3V, VSHDN = 0.3V VSHDN = 0.3V
q q q q q VS - 0.5
MIN
TYP 420 220 3
MAX 900 600 0.3
UNITS A A A V V ns ns MHz V/s MHz
VSHDN = 0.3V to 4.5V, RL = 100 VSHDN = 4.5V to 0.3V, RL = 100 Frequency = 2MHz VS = 5V, AV = -1, RL = 1k, VO = 4VP-P VS = 5V, VOUT = 4VP-P
q q q q q
80 50 140 180 14
TA = 25C. VS = 5V, VSHDN = open, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM = V + LT1809 SO-8 VCM = V - LT1809 SO-8 VCM = V + VCM = V - VCM = V - to V + LT1809 SO-8 VCM = V - to V + VCM = V +, VCM = V - VCM = V + VCM = V - + 0.2V VCM = V - + 0.2V to V + VCM = V+ VCM = V - + 0.2V VCM = V+ VCM = V - + 0.2V VCM = V - + 0.2V to V + f = 10kHz f = 10kHz f = 100kHz VO = - 4V to 4V, RL = 1k VO = - 2.5V to 2.5V, RL = 100 VCM = V - to V + VCM = V - to V + V + = 2.5V to 10V, V - = 0V V + = 2.5V to 10V, V - = 0V No Load ISINK = 5mA ISINK = 25mA No Load ISOURCE = 5mA ISOURCE = 25mA 30 4.5 70 64 V- 71 65 87 90 12 50 180 35 90 310 60 140 425 100 200 700 MIN TYP 0.8 0.8 0.8 0.8 0.35 0.35 1 2 -12.5 14.5 0.1 0.4 0.05 0.40 0.45 16 5 2 100 12 89 89 V+ MAX 3.0 3.0 3.5 3.5 2.5 3.0 6 10 40 5 10 2 5 7 UNITS mV mV mV mV mV mV mV A A A A A A A A nV/Hz pA/Hz pF V/mV V/mV dB dB V dB dB mV mV mV mV mV mV
VOS
Input Offset Voltage Shift Input Offset Voltage Match (Channel-to-Channel) (Note 10)
IB IB
Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) (Note 10)
- 30
IOS IOS en in CIN AVOL CMRR
Input Offset Current Input Offset Current Shift Input Noise Voltage Density Input Noise Current Density Input Capacitance Large-Signal Voltage Gain Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 10) Input Common Mode Range
PSRR VOL
Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 10) Output Voltage Swing LOW (Note 7)
VOH
Output Voltage Swing HIGH (Note 7)
6
LT1809/LT1810
ELECTRICAL CHARACTERISTICS
TA = 25C. VS = 5V, VSHDN = open, VCM = 0V, VOUT = 0, unless otherwise noted.
SYMBOL PARAMETER ISC IS ISHDN VL VH tON tOFF GBW SR FPBW THD tS G Short-Circuit Current Supply Current per Amplifier Supply Current, Shutdown SHDN Pin Current Output Leakage Current, Shutdown SHDN Pin Input Voltage Low SHDN Pin Input Voltage High Turn-On Time Turn-Off Time Gain-Bandwidth Product Slew Rate Full Power Bandwidth Total Harmonic Distortion Settling Time Differential Gain (NTSC) Differential Phase (NTSC) VSHDN = 0.3V to 4.5V, RL = 100 VSHDN = 4.5V to 0.3V, RL = 100 Frequency = 2MHz AV = -1, RL = 1k, VO = 4V, Measured at VO = 3V VOUT = 8VP-P AV = 1, RL = 1k, VO = 2VP-P, fC = 5MHz 0.1%, VSTEP = 8V, AV = - 1, RL = 500 AV = 2, RL = 150 AV = 2, RL = 150 110 175 V+ - 0.5 80 50 180 350 14 - 90 34 0.01 0.01 VSHDN = 0.3V VSHDN = 0.3V VSHDN = 0.3V CONDITIONS MIN 55 TYP 85 15 0.6 420 0.1 20 1.3 750 75 0.3 MAX UNITS mA mA mA A A V V ns ns MHz V/s MHz dB ns % Deg
The q denotes the specifications which apply over the 0C TA 70C temperature range. VS = 5V, VSHDN = open, VCM = 0V, VOUT = 0V, unless otherwise noted.
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM = V + LT1809 SO-8 VCM = V - LT1809 SO-8 VCM = V + VCM = V - VCM = V + VCM = V - VCM = V - to V + LT1809 SO-8 VCM = V - to V + VCM = V - to V + VCM = V + - 0.2V VCM = V - + 0.4V VCM = V - + 0.4V to V + - 0.2V VCM VCM = V - + 0.4V VCM = V + - 0.2V VCM = V - + 0.4V VCM = V - + 0.4V to V + - 0.2V VO = - 4V to 4V, RL = 1k VO = - 2.5V to 2.5V, RL = 100 VCM = V - to V + VCM = V - to V + = V + - 0.2V
q q q q q q q q q q q q q q q q q q q q q q
MIN
TYP 1 1 1 1 10 10 0.5 0.5 1.2 2.5 -15 17.5 0.1 0.5 0.06 0.5 0.56
MAX 3.25 3.25 3.75 3.75 25 25 2.75 3.25 6.5 12.5 50 6 12 2.25 6 8.25
UNITS mV mV mV mV V/C V/C mV mV mV A A A A A A A A V/mV V/mV dB dB
VOS TC VOS
Input Offset Voltage Drift (Note 8) Input Offset Voltage Shift Input Offset Voltage Match (Channel-to-Channel) (Note 10)
IB IB
Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) (Note 10)
- 37.5
IOS IOS AVOL CMRR
Input Offset Current Input Offset Current Shift Large-Signal Voltage Gain Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 10) Input Common Mode Range
27 3.5 69 63 V-
80 10 86 86 V+
V
7
LT1809/LT1810
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER PSRR VOL Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 10) Output Voltage Swing LOW (Note 7)
The q denotes the specifications which apply over the 0C TA 70C temperature range. VS = 5V, VSHDN = open, VCM = 0V, VOUT = 0V, unless otherwise noted.
CONDITIONS V + = 2.5V to 10V, V - No Load ISINK = 5mA ISINK = 25mA No Load ISOURCE = 5mA ISOURCE = 25mA = 0V
q q q q q q q q q q
MIN 70 64
TYP 83 83 20 50 210 60 120 370
MAX
UNITS dB dB
V + = 2.5V to 10V, V - = 0V
80 160 475 140 240 750 25 1.5 850 0.3
mV mV mV mV mV mV mA mA mA A A V V ns ns MHz V/s MHz
VOH
Output Voltage Swing HIGH (Note 7)
ISC IS ISHDN VL VH tON tOFF GBW SR FPBW
Short-Circuit Current Supply Current per Amplifier Supply Current, Shutdown SHDN Pin Current Output Leakage Current, Shutdown SHDN Pin Input Voltage Low SHDN Pin Input Voltage High Turn-On Time Turn-Off Time Gain-Bandwidth Product Slew Rate Full Power Bandwidth VSHDN = 0.3V to 4.5V, RL = 100 VSHDN = 4.5V to 0.3V, RL = 100 Frequency = 2MHz AV = -1, RL = 1k, VO = 4V, Measured at VO = 3V VOUT = 8VP-P VSHDN= 0.3V VSHDN = 0.3V VSHDN = 0.3V
45
75 17.5 0.6 420 3
q q q q q q q q q q
V+ - 0.5 80 50 85 140 170 300 12
The q denotes the specifications which apply over the - 40C TA 85C temperature range. VS = 5V, VSHDN = open, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 5)
SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS VCM LT1809 SO-8 VCM = V - LT1809 SO-8 VCM = V + VCM = V - VCM = V + VCM = V - VCM = V - to V + LT1809 SO-8 VCM = V - to V + VCM = V - to V + VCM = V + - 0.2V VCM = V - + 0.4V VCM = V - + 0.4V to V + - 0.2V VCM = V + - 0.2V VCM = V - + 0.4V VCM = V + - 0.2V VCM = V - + 0.4V VCM = V - + 0.4V to V + - 0.2V VO = - 4V to 4V, RL = 1k VO = - 2.5V to 2.5V, RL = 100 = V+
q q q q q q q q q q q q q q q q q q q
MIN
TYP 1 1 1 1 10 10 0.5 0.5 1.2 2.8 -17 19.8 0.1 0.6 0.08 0.6 0.68
MAX 3.75 3.75 4.25 4.25 25 25 3.00 3.75 7.5 14 59 7 14 2.5 8 10.5
UNITS mV mV mV mV V/C V/C mV mV mV A A A A A A A A V/mV V/mV
VOS TC VOS
Input Offset Voltage Drift (Note 8) Input Offset Voltage Shift Input Offset Voltage Match (Channel-to-Channel) (Note 10)
IB IB
Input Bias Current Input Bias Current Shift Input Bias Current Match (Channel-to-Channel) (Note 10)
- 45
IOS IOS AVOL
Input Offset Current Input Offset Current Shift Large-Signal Voltage Gain
22 3
70 10
8
LT1809/LT1810
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CMRR Common Mode Rejection Ratio CMRR Match (Channel-to-Channel) (Note 10) Input Common Mode Range PSRR VOL Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 10) Output Voltage Swing LOW (Note 7)
The q denotes the specifications which apply over the - 40C TA 85C temperature range. VS = 5V, VSHDN = open, VCM = 0V, VOUT = 0V, unless otherwise noted. (Note 5)
CONDITIONS VCM VCM = V- = V- to V + to V +
q q q
MIN 68 62 V- 69 63
TYP 86 86
MAX
UNITS dB dB
V+ 83 83 23 60 220 75 130 375 100 170 525 160 260 775 25 1.6 900 0.3
V dB dB mV mV mV mV mV mV mA mA mA A A V V ns ns MHz V/s MHz
V + = 2.5V to 10V, V - = 0V V + = 2.5V to 10V, V - = 0V No Load ISINK = 5mA ISINK = 25mA No Load ISOURCE = 5mA ISOURCE = 25mA
q q q q q q q q q q
VOH
Output Voltage Swing HIGH (Note 7)
ISC IS ISHDN VL VH tON tOFF GBW SR FPBW
Short-Circuit Current Supply Current per Amplifier Supply Current, Shutdown SHDN Pin Current Output Leakage Current, Shutdown SHDN Pin Input Voltage Low SHDN Pin Input Voltage High Turn-On Time Turn-Off Time Gain-Bandwidth Product Slew Rate Full Power Bandwidth VSHDN = 0.3V to 4.5V, RL = 100 VSHDN = 4.5V to 0.3V, RL = 100 Frequency = 2MHz AV = - 1, RL = 1k, VO = 4V, Measured at VO = 3V VOUT = 8VP-P VSHDN = 0.3V VSHDN = 0.3V VSHDN = 0.3V
30
75 19 0.65 420 4
q q q q q q q q q q
V+ - 0.5 80 50 80 110 160 220 8.5
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The inputs are protected by back-to-back diodes. If the differential input voltage exceeds 1.4V, the input current should be limited to less than 10mA. Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted indefinitely. Note 4: The LT1809C/LT1809I and LT1810C/LT1810I are guaranteed functional over the operating temperature range of - 40C and 85C. Note 5: The LT1809C/LT1810C are guaranteed to meet specified performance from 0C to 70C. The LT1809C/LT1810C are designed, characterized and expected to meet specified performance from - 40C to 85C but are not tested or QA sampled at these temperatures. The LT1809I/LT1810I are guaranteed to meet specified performance from - 40C to 85C.
Note 6: Minimum supply voltage is guaranteed by power supply rejection ratio test. Note 7: Output voltage swings are measured between the output and power supply rails. Note 8: This parameter is not 100% tested. Note 9: Thermal resistance varies depending upon the amount of PC board metal attached to the V - pin of the device. JA is specified for a certain amount of 2oz of copper metal trace connecting to the V - pin as described in the thermal resistance tables in the Applications Information section. Note 10: Matching parameters are the difference between the two amplifiers of the LT1810.
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LT1809/LT1810 TYPICAL PERFOR A CE CHARACTERISTICS
VOS Distribution, VCM = 0V (PNP Stage)
50 VS = 5V, 0V 40 PERCENT OF UNITS (%) PERCENT OF UNITS (%) 40 PERCENT OF UNITS (%) 50 VS = 5V, 0V 20
30
20
10
0
-3
2 -1 0 1 -2 INPUT OFFSET VOLTAGE (mV)
Supply Current vs Supply Voltage
25
INPUT BIAS CURRENT (A)
20
SUPPLY CURRENT (mA)
OFFSET VOLTAGE (mV)
TA = 125C 15 TA = 25C
10
TA = -55C
5
0
0
1
2345678 TOTAL SUPPLY VOLTAGE (V)
Input Bias Current vs Temperature
5 3
INPUT BIAS CURRENT (A)
OUTPUT LOW SATURATION VOLTAGE (V)
1 -1 -3 -5 -7 -9 -11 -13
VCM = 5V
1
OUTPUT HIGH SATURATION VOLTAGE (V)
VS = 5V, 0V
VCM = 0V
-15 -50 -35 -20 -5 10 25 40 55 TEMPERATURE (C)
10
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3
1809 G01
VOS Distribution, VCM = 5V (NPN Stage)
25
VOS Shift for VCM = 0V to 5V
VS = 5V, 0V
30
15
20
10
10
5
0
-3
2 -1 0 1 -2 INPUT OFFSET VOLTAGE (mV)
3
1809 G02
0
-1 -0.75 -0.5 -0.25 0 0.25 0.5 0.75 INPUT OFFSET VOLTAGE (mV)
1
1809 G03
Offset Voltage vs Input Common Mode
2.0 1.5 1.0 0.5 0 -0.5 TA = -55C -1.0 -1.5 TA = 25C VS = 5V, 0V TYPICAL PART TA = 125C 10 5 0 -5 -10 -15 -20 -25 0 4 INPUT COMMON MODE VOLTAGE (V) 1 2 3 5
Input Bias Current vs Common Mode Voltage
VS = 5V, 0V TA = 25C TA = 125C TA = -55C
TA = -55C TA = 25C TA = 125C
9
10
-30 -1
0
4 5 1 3 2 COMMON MODE VOLTAGE (V)
6
1809 G06
1809 G04
1809 G05
Output Saturation Voltage vs Load Current (Output Low)
10 VS = 5V, 0V 10
Output Saturation Voltage vs Load Current (Output High)
VS = 5V, 0V
1
0.1 TA = 125C 0.01 TA = -55C TA = 25C
0.1
TA = 125C TA = 25C
0.01 TA = -55C
70
85
0.001 0.01
0.1 1 10 LOAD CURRENT (mA)
100
1809 G08
0.001 0.01
0.1 1 10 LOAD CURRENT (mA)
100
1809 G09
1809 G07
LT1809/LT1810 TYPICAL PERFOR A CE CHARACTERISTICS
Minimum Supply Voltage
1.0
OUTPUT SHORT-CIRCUIT CURRENT (mA)
CHANGE IN OFFSET VOLTAGE (mV)
0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0
VCM = V- + 0.5V
60 40 20 0 -20 -40 -60 -80 1.5
TA = 125C
"SINKING"
SUPPLY CURRENT (mA)
TA = -55C TA = 125C TA = 25C
1.5
2.0
2.5 3.0 3.5 4.0 4.5 TOTAL SUPPLY VOLTAGE (V)
SHDN Pin Current vs SHDN Pin Voltage
50 0
VS = 5V, 0V
SHDN PIN CURRENT (A)
-50
INPUT VOLTAGE (mV)
-100 -150 -200 -250 -300 -350 -400 -450 0 1
1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 RL = 100 RL = 1k
INPUT VOLTAGE (mV)
TA = 125C TA = -55C TA = 25C
3 4 2 SHDN PIN VOLTAGE (V)
Open-Loop Gain
2.5 2.0 1.5
OFFSET VOLTAGE (mV)
CHANGE IN OFFSET VOLTAGE (V)
INPUT VOLTAGE (mV)
1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 -5 -4 -3 -2 -1 0 1 2 3 OUTPUT VOLTAGE (V) 4 5 RL = 100 RL = 1k
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1809 G10
Output Short-Circuit Current vs Power Supply Voltage
120 100 80 TA = -55C TA = 25C
Supply Current vs SHDN Pin Voltage
18 16 14 12 10 8 6 4 2 TA = -55C TA = 25C TA = 125C VS = 5V, 0V
"SOURCING" TA = -55C TA = 25C 4.0 4.5 2.0 2.5 3.0 3.5 POWER SUPPLY VOLTAGE (V) 5.0 TA = 125C
5.0
-100
0 0 1 4 3 2 SHDN PIN VOLTAGE (V)
1809 G12
5
1809 G11
Open-Loop Gain
2.5 2.0 1.5 VS = 3V, 0V 2.5 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 0 0.5 1.5 2.0 1.0 OUTPUT VOLTAGE (V) 2.5 3.0
1809 G14
Open-Loop Gain
VS = 5V, 0V
RL = 1k
RL = 100
5
1809 G13
0
1
3 2 OUTPUT VOLTAGE (V)
4
5
1809 G15
Offset Voltage vs Output Current
VS = 5V
15 10 5 0 TA = -55C -5 -10 -15 -100 -80 -60 -40 -20 0 20 40 60 80 100 OUTPUT CURRENT (mA)
1809 G17
Warm-Up Drift vs Time (LT1809S8)
180 160 140 120 100 80 60 40 20 0 0 20 40 60 80 100 120 140 160 TIME AFTER POWER UP (SEC)
1809 G18
VS = 5V
TA = 25C VS = 5V
TA = 25C TA = 125C
VS = 5V, 0V VS = 3V, 0V
1809 G16
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LT1809/LT1810 TYPICAL PERFOR A CE CHARACTERISTICS
Input Noise Voltage vs Frequency
100 90
NOISE VOLTAGE (nV/Hz)
VS = 5V, 0V
70 60 50 40 30 20 10 0 0.1 PNP ACTIVE VCM = 2.5V NPN ACTIVE VCM = 4.5V
OUTPUT VOLTAGE (V/DIV) 100
1809 G20
CURRENT NOISE (pA/Hz)
80
1 10 FREQUENCY (kHz)
Gain Bandwidth and Phase Margin vs Supply Voltage
TA = 25C RL = 1k 55 50 PHASE MARGIN 190 185 180 175 170 165 160 0 2 6 8 4 TOTAL SUPPLY VOLTAGE (V) 10
1809 G23
GAIN BANDWIDTH (MHz)
GAIN BANDWIDTH (MHz)
35
VS = 3V, 0V 200 190 180 170 160 150 -55 -25 VS = 3V, 0V GAIN BANDWIDTH 50 25 0 75 TEMPERATURE (C) 100 VS = 5V
SLEW RATE (V/s)
GAIN BANDWIDTH
Gain and Phase vs Frequency
60 50 40 VS = 3V, 0V PHASE VS = 5V 100 80 60
GAIN (dB)
GAIN (dB)
VS = 5V VS = 3V, 0V
GAIN (dB)
30 20 10
GAIN 0 -10 CL = 5pF RL = 1k 1M 10M 100M FREQUENCY (Hz) 1G
1809 G22
-20 100k
12
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1809 G19
Input Noise Current vs Frequency
20 VS = 5V, 0V 10 8 16 6 4 2 0 -2 -4 -6 -8 -10
0.1Hz to 10Hz Output Voltage Noise
12
8
PNP ACTIVE VCM = 2.5V NPN ACTIVE VCM = 4.5V
4
0
100
0.1
1 10 FREQUENCY (kHz)
TIME (2 SEC/DIV)
1809 G21
Gain Bandwidth and Phase Margin vs Temperature
55 PHASE MARGIN VS = 5V 50 45 350 300 250 200 150 100 125 450 400
Slew Rate vs Temperature
45
VS = 5V VS = 5V, 0V
PHASE MARGIN (DEG) PHASE (DEG)
PHASE MARGIN (DEG)
40
40 35 30
50 - 55 - 25
AV = 1 RF = RG = 1k RL = 1k RISING AND FALLING SLEW RATE 0 75 50 25 TEMPERATURE (C) 100 125
1809 G24
1809 G25
Closed-Loop Gain vs Frequency
15 12 9 6 3 0 -3 -6
-20 -40 -60
Closed-Loop Gain vs Frequency
15 12 9 AV = +2
AV = +1
40 20 0
VS = 3V VS = 5V
6 3 0 -3 -6 -9 -12 VS = 3V VS = 5V
-9 -12 -15 100k 1M 10M FREQUENCY (Hz) 100M 500M
1809 G26
-15 100k
1M
10M FREQUENCY (Hz)
100M
500M
1809 G27
LT1809/LT1810 TYPICAL PERFOR A CE CHARACTERISTICS
Output Impedance vs Frequency
600
110
COMMON MODE REJECTION RATIO (dB)
POWER SUPPLY REJECTION RATIO (dB)
VS = 5V, 0V 100
OUTPUT IMPEDANCE ()
10 AV = 10 1 AV = 2 AV = 1 0.1
0.01 100k
1M
10M FREQUENCY (Hz)
Series Output Resistor vs Capacitive Load
40 35 30 OVERSHOOT (%) 25 20 15 10 5 0 10 100 CAPACITIVE LOAD (pF) 1000
1809 G32
VS = 5V, 0V AV = +1
OVERSHOOT (%)
RS = 10, RL = RS = 20, RL =
RL = RS = 50
Distortion vs Frequency
-40 -50 -60 -70 -80 -90 RL = 100, 3RD -100 -110 0.3 RL = 1k, 3RD RL = 1k, 2ND 1 FREQUENCY (MHz)
1809 G35
AV = +1 VO = 2VP-P VS = 5V
DISTORTION (dB)
DISTORTION (dB)
DISTORTION (dB)
RL = 100, 2ND
10
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100M
1809 G28
Common Mode Rejection Ratio vs Frequency
100 90 80 70 60 50 40 30 20 10 10k 100k 1M 10M FREQUENCY (Hz) 100M 500M
1809 G30
Power Supply Rejection Ratio vs Frequency
100 90 80 70 60 50 40 30 20 10 0 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M
1809 G31
VS = 5V, 0V
VS = 5V, 0V TA = 25C POSITIVE SUPPLY NEGATIVE SUPPLY
500M
Series Output Resistor vs Capacitive Load
50 VS = 5V, 0V 45 AV = +2 40 35 30 25 20 15 10 5 0 10 100 CAPACITIVE LOAD (pF) 1000
1809 G33
0.01% Settling Time
INPUT SIGNAL GENERATION (2V/DIV)
RS = 10 RL =
RS = 20 RL =
OUTPUT SETTLING RESOLUTION (2mV/DIV)
RL = RS = 50
20ns/DIV VS = 5V VOUT = 4V AV = - 1 RL = 500 tS = 110ns (SETTLING TIME)
1809 G34
Distortion vs Frequency
-40 -50 -60 -70 -80 -90 RL = 100, 3RD -100 -110 0.3 RL = 1k, 3RD
-100
Distortion vs Frequency
-40 -50 -60 RL = 100, 2ND -70 -80 -90 RL = 1k, 2ND RL = 100, 3RD RL = 1k, 3RD AV = +2 VO = 2VP-P VS = 5V
AV = +1 VO = 2VP-P VS = 5V
RL = 1k, 2ND RL = 100, 2ND
30
1 FREQUENCY (MHz)
10
30
1809 G36
-110 0.3
1 FREQUENCY (MHz)
10
30
1809 G37
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LT1809/LT1810 TYPICAL PERFOR A CE CHARACTERISTICS
Distortion vs Frequency
-40 -50 -60 RL = 100, 2ND -70 -80 RL = 1k, 2ND -90 -100 -110 0.3 RL = 100, 3RD RL = 1k, 3RD AV = +2 VO = 2VP-P VS = 5V 4.6
OUTPUT VOLTAGE SWING (VP-P)
DISTORTION (dB)
5V Large-Signal Response
VS = 5V AV = +1 RL = 1k
10ns/DIV
5V Small-Signal Response
VS = 5V AV = +1 RL = 1k
10ns/DIV
14
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1
Maximum Undistorted Output Signal vs Frequency
VS = 5V AV = -1 4.5 4.4 4.3 4.2 4.1 4.0 3.9 0.1
AV = +2
10 FREQUENCY (MHz)
30
1809 G38
1 10 FREQUENCY (MHz)
100
1809 G39
5V Small-Signal Response
5V Large-Signal Response
1809 G40
VS = 5V AV = +1 RL = 1k
10ns/DIV
1809 G41
VS = 5V AV = +1 RL = 1k
10ns/DIV
1809 G42
Output Overdriven Recovery
Shutdown Response
VIN (1V/DIV) 0V 0V
VSHDN 0V VOUT 0V
VOUT (2V/DIV)
1809 G43
VS = 5V, 0V AV = +2
100ns/DIV
1809 G44
VS = 5V, 0V AV = +2 RL = 100
100ns/DIV
1809 G44
LT1809/LT1810
APPLICATIO S I FOR ATIO
Rail-to-Rail Characteristics The LT1809/LT1810 have an input and output signal range that includes both negative and positive power supply. Figure 1 depicts a simplified schematic of the amplifier. The input stage is comprised of two differential amplifiers, a PNP stage Q1/Q2 and a NPN stage Q3/Q4 that are active over different ranges of common mode input voltage. The PNP differential pair is active for common mode voltages between the negative supply to approximately 1.5V below the positive supply. As the input voltage moves closer toward the positive supply, the transistor Q5 will steer the tail current I1 to the current mirror Q6/Q7, activating the NPN differential pair and causing the PNP pair to become inactive for the rest of the input common mode range up to the positive supply. A pair of complementary common emitter stages Q14/Q15 form the output stage, enabling the output to swing from rail-to-rail. The capacitors C1 and C2 form the local feedback loops that lower the output impedance at high frequency. These devices are fabricated on Linear Technology's proprietary high speed complementary bipolar process.
V+ R6 10k V+ ESDD5 D9 SHDN ESDD6 V- D5 -IN ESDD4 V- V+ ESDD3 D7 Q4 Q3 Q1 Q2 D3 Q10 D4 Q9 Q8 C1 Q7 Q6 R1 V- R2
1809 F01
Q16
Q17 V+
V- ESDD2 D1 I1 Q11 Q12 Q13 C2 Q15
R7 100k
ESDD1 +IN
D6
D8
BIAS GENERATION
Figure 1. LT1809 Simplified Schematic Diagram
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Power Dissipation The LT1809/LT1810 amplifiers combine high speed with large output current in a small package, so there is a need to ensure that the die's junction temperature does not exceed 150C. The LT1809 is housed in an SO-8 package or a 6-lead SOT-23 package and the LT1810 is in an SO-8 or 8-lead MSOP package. All packages have the V - supply pin fused to the lead frame to enhance the thermal conductance when connecting to a ground plane or a large metal trace. Metal trace and plated through-holes can be used to spread the heat generated by the device to the backside of the PC board. For example, on a 3/32" FR-4 board with 2oz copper, a total of 660 square millimeters connected to Pin 4 of LT1810 in an SO-8 package (330 square millimeters on each side of the PC board) will bring the thermal resistance, JA, to about 85C/W. Without extra metal trace connected to the V - pin to provide a heat sink, the thermal resistance will be around 105C/W. More information on thermal resistance for all packages with various metal areas connecting to the V - pin is provided in Tables 1, 2 and 3 for thermal consideration.
R3 R4 R5 D2 Q5 VBIAS CC V- I2 OUT BUFFER AND OUTPUT BIAS Q14
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LT1809/LT1810
APPLICATIO S I FOR ATIO
Table 1. LT1809 6-Lead SOT-23 Package
COPPER AREA TOPSIDE (mm2) 270 100 20 0 BOARD AREA (mm2) 2500 2500 2500 2500
THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 135C/W 145C/W 160C/W 200C/W
Device is mounted on topside.
Table 2. LT1809/LT1810 SO-8 Package
COPPER AREA TOPSIDE BACKSIDE (mm2) (mm2) 1100 330 35 35 0 1100 330 35 0 0 BOARD AREA (mm2) 2500 2500 2500 2500 2500 THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 65C/W 85C/W 95C/W 100C/W 105C/W
Device is mounted on topside.
Table 3. LT1810 8-Lead MSOP Package
COPPER AREA TOPSIDE BACKSIDE (mm2) (mm2) 540 100 100 30 0 540 100 0 0 0 BOARD AREA THERMAL RESISTANCE (mm2) (JUNCTION-TO-AMBIENT) 2500 2500 2500 2500 2500 110C/W 120C/W 130C/W 135C/W 140C/W
Device is mounted on topside.
Junction temperature TJ is calculated from the ambient temperature TA and power dissipation PD as follows: TJ = TA + (PD * JA) The power dissipation in the IC is the function of the supply voltage, output voltage and the load resistance. For a given supply voltage, the worst-case power dissipation PD(MAX) occurs at the maximum supply current with the output voltage at half of either supply voltage (or the maximum swing is less than 1/2 the supply voltage). PD(MAX) is given by: PD(MAX) = (VS * IS(MAX)) + (VS/2)2/RL Example: An LT1810 in SO-8 mounted on a 2500mm 2 area of PC board without any extra heat spreading plane
16
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connected to its V - pin has a thermal resistance of 105C/W, JA. Operating on 5V supplies with both amplifiers simultaneously driving 50 loads, the worstcase power dissipation is given by: PD(MAX) = 2 * (10 * 25mA) + 2 * (2.5)2/50 = 0.5 + 0.250 = 0.750W The maximum ambient temperature that the part is allowed to operate is: TA = TJ - (PD(MAX) * 105C/W) = 150C - (0.750W * 105C/W) = 71C To operate the device at higher ambient temperature, connect more metal area to the V - pin to reduce the thermal resistance of the package as indicated in Table 2. Input Offset Voltage The offset voltage will change depending upon which input stage is active and the maximum offset voltage is guaranteed to be less than 3mV. The change of VOS over the entire input common mode range (CMRR) is less than 2.5mV on a single 5V and 3V supply. Input Bias Current The input bias current polarity depends upon a given input common voltage at whichever input stage is operating. When the PNP input stage is active, the input bias currents flow out of the input pins and flow into the input pins when the NPN input stage is activated. Because the input offset current is less than the input bias current, matching the source resistances at the input pin will reduce total offset error. Output The LT1809/LT1810 can deliver a large output current, so the short-circuit current limit is set around 90mA to prevent damage to the device. Attention must be paid to keep the junction temperature of the IC below the absolute maximum rating of 150C (refer to the Power Dissipation section) when the output is continuously short circuited. The output of the amplifier has reverse-biased diodes connected to each supply. If the output is forced
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LT1809/LT1810
APPLICATIO S I FOR ATIO
beyond either supply, unlimited current will flow through these diodes. If the current is transient and limited to several hundred milliamps, no damage to the device will occur. Overdrive Protection When the input voltage exceeds the power supplies, two pairs of crossing diodes, D1 to D4, will prevent the output from reversing polarity. If the input voltage exceeds either power supply by 700mV, diodes D1/D2 or D3/D4 will turn on, keeping the output at the proper polarity. For the phase reversal protection to perform properly, the input current must be limited to less than 5mA. If the amplifier is severely overdriven, an external resistor should be used to limit the overdrive current. The LT1809/LT1810's input stages are also protected against differential input voltages of 1.4V or higher by back-to-back diodes, D5/D8, that prevent the emitter-base breakdown of the input transistors. The current in these diodes should be limited to less than 10mA when they are active. The worst-case differential input voltage usually occurs when the input is driven while the output is shorted to ground in a unity-gain configuration. In addition, the amplifier is protected against ESD strikes up to 3kV on all pins by a pair of protection diodes on each pin that are connected to the power supplies as shown in Figure 1. Capacitive Load The LT1809/LT1810 is optimized for high bandwidth and low distortion applications. It can drive a capacitive load about 20pF in a unity-gain configuration and more with higher gain. When driving a larger capacitive load, a resistor of 10 to 50 should be connected between the
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output and the capacitive load to avoid ringing or oscillation. The feedback should still be taken from the output so that the resistor will isolate the capacitive load to ensure stability. Graphs on capacitive loads indicate the transient response of the amplifier when driving capacitive load with a specified series resistor. Feedback Components When feedback resistors are used to set up gain, care must be taken to ensure that the pole formed by the feedback resistors and the total capacitance at the inverting input does not degrade stability. For instance, the LT1809 in a noninverting gain of 2, set up with two 1K resistors and a capacitance of 3pF (device plus PC board), will probably ring in transient response. The pole that is formed at 106MHz will reduce phase margin by 34 degrees when the crossover frequency of the amplifier is around 70MHz. A capacitor of 3pF or higher connected across the feedback resistor will eliminate any ringing or oscillation. SHDN Pin The LT1809 has a SHDN pin to reduce the supply current to less than 1.25mA. When the SHDN pin is pulled low, it will generate a signal to power down the device. If the pin is left unconnected, an internal pull-up resistor of 10k will keep the part fully operating as shown in Figure 1. The output will be high impedance during shutdown, and the turn-on and turn-off time is less than 100ns. Because the inputs are protected by a pair of back-to-back diodes, the input signal will feed through to the output during shutdown mode if the amplitude of signal between the inputs is larger than 1.4V.
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LT1809/LT1810
TYPICAL APPLICATIO S
Driving A/D Converters The LT1809/LT1810 have a 27ns settling time to 0.1% of a 2V step signal and 20 output impedance at 100MHz making it ideal for driving high speed A/D converters. With the rail-to-rail input and output and low supply voltage operation, the LT1809 is also desirable for single supply applications. As shown in Figure 2, the LT1809 drives a 10Msps, 12-bit ADC, the LTC1420. The lowpass filter, R3 and C1, reduces the noise and distortion products that might come from the input signal. High quality capacitors and resistors, an NPO chip capacitor and metal-film surface mount resistors, should be used since these components can add to distortion. The voltage glitch of the converter, due to its sampling nature, is buffered by the LT1809 and the ability of the amplifier to settle it quickly will affect the spurious-free dynamic range of the system. Figure 2 to Figure 7 depict the LT1809 driving the LTC1420 at different configurations and voltage supplies. The FFT responses show better than 90dB of SFDR for a 5V supply, and 80dB on a 5V single supply for the 1.394MHz signal.
5V 5V VIN 1VP-P
AMPLITUDE (dB)
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+
LT1809
R3 49.9 +AIN C1 470pF -5V R2 1k -AIN
-
LTC1420 PGA GAIN = 1 REF = 2.048V
* * *
12 BITS 10Msps
1809 F02
-5V R1 1k
Figure 2. Noninverting A/D Driver
0 -20 -40 -60 -80
VS = 5V AV = +2 fSAMPLE = 10Msps fIN = 1.394MHz SFDR = 90dB
-100 -120 0 1 2 3 FREQUENCY (MHz) 4 5
1809 F03
Figure 3. 4096 Point FFT Response
LT1809/LT1810
TYPICAL APPLICATIO S
0 -20 VS = 5V AV = -1 fSAMPLE = 10Msps fIN = 1.394MHz SFDR = 90dB
1k 5V 5V VIN 2VP-P 1k
AMPLITUDE (dB)
* * * 12 BITS 10Msps
1809 F04
-
LT1809
49.9 +AIN 470pF -5V -AIN
+
Figure 4. Inverting A/D Driver
5V VIN 1VP-P ON 2.5V DC 3
+ -
7 LT1809 6 1 4 1k 470pF 49.9 1 +AIN 2 -AIN LTC1420 PGA GAIN = 2 REF = 4.096V VCM 3 1F
1809 F06
AMPLITUDE (dB)
2
1k 0.15F
Figure 6. Single Supply A/D Driver
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-40 -60 -80
LTC1420 PGA GAIN = 1 REF = 2.048V
-100 -120 0 1 2 3 FREQUENCY (MHz) 4 5
1809 F05
-5V
Figure 5. 4096 Point FFT Response
0 -20 5V -40 -60 -80
VS = 5V AV = +2 fSAMPLE = 10Msps fIN = 1.394MHz SFDR = 80dB
* * *
12 BITS 10Msps
-100 -120 0 1 2 3 FREQUENCY (MHz) 4 5
1809 F07
Figure 7. 4096 Point FFT Response
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LT1809/LT1810
TYPICAL APPLICATIO S
Single Supply Video Line Driver The LT1809 is a wideband rail-to-rail op amp with a large output current that allows it to drive video signals in low supply applications. Figure 8 depicts a single supply video line driver with AC coupling to minimize the quiescent power dissipation. Resistors R1 and R2 are used to levelshift the input and output to provide the largest signal swing. A gain of 2 is set up with R3 and R4 to restore the signal at VOUT, which is attenuated by 6dB due to the matching of the 75 line with the back-terminated resistor, R5. The back termination will eliminate any reflection of the signal that comes from the load. The input termination resistor, RT, is optional--it is used only if matching of the incoming line is necessary. The values of C1, C2 and C3 are selected to minimize the droop of the luminance signal. In some less stringent requirements, the value of capacitors could be reduced. The - 3dB bandwidth of the driver is about 95MHz on 5V supply and the amount of peaking will vary upon the value of capacitor C4.
C1 33F
VIN RT 75
2
+
VOLTAGE GAIN (dB)
20
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5V R1 5k R2 5k
3
+ -
7 LT1809 4 R4 1k C4 3pF 6
C3 1000F
R5 75
75 COAX CABLE VOUT RLOAD 75
1809 F08
+
R3 1k
+
C2 150F
Figure 8. 5V Single Supply Video Line Driver
5 4 3 2 1 0 -1 -2 -3 -4
VS = 5V
-5 0.2
1
10 FREQUENCY (MHz)
100
1809 F09
Figure 9. Video Line Driver Frequency Response
LT1809/LT1810
PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted. S6 Package 6-Lead Plastic SOT-23
(Reference LTC DWG # 05-08-1634) (Reference LTC DWG # 05-08-1636)
2.80 - 3.10 (.110 - .118) (NOTE 3)
SOT-23 (Original) A A1 A2 L .90 - 1.45 (.035 - .057) .00 - 0.15 (.00 - .006) .90 - 1.30 (.035 - .051) .35 - .55 (.014 - .021)
SOT-23 (ThinSOT) 1.00 MAX (.039 MAX) .01 - .10 (.0004 - .004) .80 - .90 (.031 - .035) .30 - .50 REF (.012 - .019 REF) 2.60 - 3.00 (.102 - .118) 1.50 - 1.75 (.059 - .069) (NOTE 3) PIN ONE ID
.95 (.037) REF
.25 - .50 (.010 - .020) (6PLCS, NOTE 2)
.20 (.008) DATUM `A' A A2
L NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES)
.09 - .20 (.004 - .008) (NOTE 2)
1.90 (.074) REF
A1
S6 SOT-23 0401
3. DRAWING NOT TO SCALE 4. DIMENSIONS ARE INCLUSIVE OF PLATING 5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 6. MOLD FLASH SHALL NOT EXCEED .254mm 7. PACKAGE EIAJ REFERENCE IS: SC-74A (EIAJ) FOR ORIGINAL JEDEC MO-193 FOR THIN
21
LT1809/LT1810
PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted. MS8 Package 8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.118 0.004* (3.00 0.102)
8
76
5
0.193 0.006 (4.90 0.15)
0.118 0.004** (3.00 0.102)
1 0.043 (1.10) MAX 0.007 (0.18) 0.021 0.006 (0.53 0.015) 0 - 6 TYP SEATING PLANE
23
4 0.034 (0.86) REF
0.009 - 0.015 (0.22 - 0.38)
0.0256 (0.65) BSC
0.005 0.002 (0.13 0.05)
MSOP (MS8) 1100
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
22
LT1809/LT1810
PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 8 7 6 5
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
2
3
4
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
0.014 - 0.019 (0.355 - 0.483) TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.016 - 0.050 (0.406 - 1.270)
0.050 (1.270) BSC
SO8 1298
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
23
LT1809/LT1810
TYPICAL APPLICATIO
Single 3V Supply, 4MHz, 4th Order Butterworth Filter Benefiting from a low voltage supply operation, low distortion and rail-to-rail output of LT1809, a low distortion filter that is suitable for antialiasing can be built as
232 47pF 274 22pF 232 VIN 220pF 665
VS 2
Figure 10. Single 3V Supply, 4MHz, 4th Order Butterworth Filter
10 0 -10 -20
GAIN (dB)
RELATED PARTS
PART NUMBER LT1395 LT1632/LT1633 LT1630/LT1631 LT1806/LT1807 DESCRIPTION 400MHz Current Feedback Amplifier Dual/Quad 45MHz, 45V/s Rail-to-Rail Input and Output Op Amps Dual/Quad 30MHz, 10V/s Rail-to-Rail Input and Output Op Amps Single/Dual 325MHz, 140V/s Rail-to-Rail Input and Output Op Amps COMMENTS 800V/s Slew Rate, Shutdown High DC Accuracy, 1.35mV VOS(MAX), 70mA Output Current, Max Supply Current 5.2mA per Amplifier High DC Accuracy, 525V VOS(MAX), 70mA Output Current, Max Supply Current 4.4mA per Amplifier High DC Accuracy, 550V VOS(MAX), Low Noise 3.5nV/Hz, Low Distortion -80dBc at 5MHz
24
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
U
shown Figure 10. On a 3V supply, the filter has a passband of 4MHz with 2.5VP-P signal and a stopband that is greater than 70dB to frequency of 100MHz.
-
1/2 LT1810 274 562 470pF
-
1/2 LT1810 VOUT
+
+
1809 F10
-30 -40 -50 -60 -70 -80 -90 10k VS = 3V, 0V VIN = 2.5VP-P 100k 1M 10M FREQUENCY (Hz) 100M
1809 F11
Figure 11. Filter Frequency Response
sn180910 180910fs LT/TP 1100 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 2000

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