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LT1494/LT1495/LT1496 1.5A Max, Single, Dual and Quad Over-The-Top Precision Rail-to-Rail Input and Output Op Amps
FEATURES
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DESCRIPTIO
Low Supply Current: 1.5A Max Rail-to-Rail Input and Output Low Offset Voltage: 375V Max Operating Temperature Range: - 40C to 125C Over-The-TopTM Inputs Operate Above V+ Wide Supply Range: 2.2V to 36V Single Supply Input Range: - 0.3V to 36V Low Input Bias Current: 250pA Low Input Offset Current: 20pA High AVOL: 100V/mV Minimum Driving 100k Load Output Sources and Sinks 500A Load Current Reverse Battery Protected to 18V
The LT(R)1494/LT1495/LT1496 are the lowest power (IS 1.5A) op amps with precision specifications. The extremely low supply current is combined with excellent amplifier specifications: input offset voltage is 375V maximum with a typical drift of only 0.4V/C, input offset current is 100pA maximum. A minimum open-loop gain (AVOL) of 100V/mV ensures that gain errors are small. The device characteristics change little over the supply range of 2.2V to 15V. Supply rejection is 90dB and the common mode rejection ratio is 90dB. Operation is specified for 3V, 5V and 15V supplies. Reverse battery protection (-18V min) and inputs that operate above the positive supply make the LT1494/LT1495/LT1496 easy to use in harsh environments. The low bias currents and offset current of the amplifier permit the use of megohm level source resistors without introducing significant errors. Voltage noise at 4VP-P is remarkably low considering the low supply current. The LT1494 is available in the 8-Pin MSOP, PDIP and SO packages.The LT1495 is available in plastic 8-Pin PDIP and SO packages with the standard dual op amp pinout. The LT1496 is available in 14-Pin SO and PDIP packages.
APPLICATIO S
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Battery- or Solar-Powered Systems Portable Instrumentation Remote Sensor Amplifier Micropower Filter
, LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
Micropower Integrating Current Sense
RESET 0.1F VCC RI 1M RS 0.1 1M IL LOAD 10M VCC 200k 10M
1495 TA01
30 25 20 100 AMPLIFIERS VS = 2.5V -40C TO 85C
1/2 LT1495
-
1/2 LT1495 VO
UNITS
- +
15 10 5 0 - 2.0 -1.6 -1.2 -0.8 -0.4 0 0.4 0.8 1.2 1.6 2.0 TC VOS (V/C)
1495 TA02
+
RI C = (4.9A)(SEC) FOR VCC = 5V RS IS = 3A DURING INTEGRATION; IS = 5A END OF INTEGRATION
OUTPUT SWITCHES WHEN ILdt = 0.98 VCC
()
U
TC VOS Distribution
U
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1
LT1494/LT1495/LT1496
ABSOLUTE MAXIMUM RATINGS (Note 1)
Total Supply Voltage (V + to V -) .............................. 36V Differential Input Voltage ......................................... 36V Input Current ...................................................... 10mA Output Short-Circuit Duration ....................... Continuous Operating Temperature Range (Note 2) LT1494C/LT1495C/LT1496C .............. - 40C to 85C LT1494I/LT1495I/LT1496I ................. - 40C to 85C LT1494H/LT1495H/LT1496H ........... - 40C to 125C Specified Temperature Range (Note 3) LT1494C/LT1495C/LT1496C .............. - 40C to 85C LT1494I/LT1495I/LT1496I ................. - 40C to 85C LT1494H/LT1495H/LT1496H ........... - 40C to 125C Storage Temperature Range ................. - 65C to 150C Junction Temperature ........................................... 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
ORDER PART NUMBER
TOP VIEW NC -IN +IN V- 1 2 3 4 8 NC 7 V+ 6 OUT 5 NC
TOP VIEW NC 1 -IN 2 +IN 3 V- 4 N8 PACKAGE 8-LEAD PDIP 8 7 6 5 NC V+ OUT NC
LT1494CMS8 LT1494IMS8
MS8 PACKAGE 8-LEAD PLASTIC MSOP
TJMAX = 150C, JA = 250C/ W
MS8 PART MARKING LTFF LTFG ORDER PART NUMBER
TOP VIEW OUT A 1 -IN A 2 A +IN A 3 V- 4 N8 PACKAGE 8-LEAD PDIP B 5 8 7 6 V+ OUT B -IN B +IN B
LT1495CN8 LT1495CS8 LT1495IN8 LT1495IS8 LT1495HS8 S8 PART MARKING 1495 1495I 1495H
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/ W (N8) TJMAX = 150C, JA = 190C/ W (S8)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
U
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WW U
W
ORDER PART NUMBER LT1494CN8 LT1494CS8 LT1494IN8 LT1494IS8 LT1494HS8 S8 PART MARKING 1494 1494I 1494H ORDER PART NUMBER
14 OUT D 13 -IN D 12 +IN D 11 V - 10 +IN C
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/ W (N8) TJMAX = 150C, JA = 190C/ W (S8)
TOP VIEW OUT A -IN A +IN A V+ +IN B -IN B OUT B 1 2 3 4 5 6 7 B C A D
9 8
-IN C OUT C
LT1496CN LT1496CS LT1496IN LT1496IS LT1496HS
N PACKAGE 14-LEAD PDIP
S PACKAGE 14-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/ W (N) TJMAX = 150C, JA = 160C/ W (S)
LT1494/LT1495/LT1496
ELECTRICAL CHARACTERISTICS
TA = 25C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted.
SYMBOL PARAMETER Input Offset Voltage VOS CONDITIONS VS = 5V VS = 3V VS = 5V, MS8 Package VS = 3V, MS8 Package (Note 5) VCM = 10V (Note 6) (Note 5) 0.1Hz to 10Hz f = 100Hz f = 100Hz VS = 5V, VO = 0.25V to 4.5V, RL = 100k VS = 3V, VO = 0.25V to 2.5V, RL = 100k VCM = 0V to 4V, VS = 5V VCM = 0V to 10V, VS = 5V VS = 2.2V to 12V, VCM = VO = 0.5V No Load ISINK = 100A No Load ISOURCE = 100A (Note 5) (Note 6) IS = 10A per Amplifier AV = -1, VS = 5V f = 100Hz MIN TYP 150 200 150 200 250 180 20 4 185 10 500 250 106 95 99 2.1 50 210 V+ - 0.035 V+ - 0.160 1.3 1.0 1.0 2.7 MAX 375 475 475 575 1000 360 100 UNITS V V V V pA nA pA VP-P nV/Hz fA/Hz V/mV V/mV V dB dB dB V mV mV V V mA A V V/ms kHz
IB IOS en in AVOL
Input Bias Current Input Offset Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Large-Signal Voltage Gain Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Minimum Operating Supply Voltage Output Voltage Swing LOW Output Voltage Swing HIGH Short-Circuit Current Supply Current per Amplifier Reverse Supply Voltage Slew Rate Gain Bandwidth Product
CMRR PSRR VOL VOH ISC IS SR GBW
100 50 0 90 74 90
36
2.2 100 410
V+ - 0.07 V+ - 0.32 0.7 -18 0.4
1.5
3
LT1494/LT1495/LT1496
The q denotes the specifications which apply over the temperature range of 0C TA 70C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted. (Note 3)
SYMBOL PARAMETER Input Offset Voltage VOS CONDITIONS VS = 5V VS = 3V VS = 5V, MS8 Package VS = 3V, MS8 Package (Note 4) (Note 5) VCM = 10V (Note 6) (Note 5) VS = 5V, VO = 0.25V to 4.5V, RL = 100k VS = 3V, VO = 0.25V to 2.5V, RL = 100k VCM = 0.2V to 4V, VS = 5V VCM = 0.2V to 10V, VS = 5V VS = 2.4V to 12V, VCM = VO = 0.5V No Load ISINK = 100A No Load ISOURCE = 100A (Note 5) (Note 6) MIN
q q q q q q q q q q q q q q q q q q q q q
ELECTRICAL CHARACTERISTICS
VOS TC IB IOS AVOL
Input Offset Voltage Drift Input Bias Current Input Offset Current Large-Signal Voltage Gain Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Minimum Operating Supply Voltage Output Voltage Swing LOW Output Voltage Swing HIGH Short-Circuit Current Supply Current per Amplifier
CMRR PSRR VOL VOH ISC IS
75 40 0.2 89 64 89
TYP 175 225 175 225 0.4 250 240 20 280 150 106 85 99 2.3 55 225 V+ - 0.04 V+ - 0.18 1.1 1.2
MAX 425 525 525 625 2 1200 500 120
36
2.4 110 450
V+ - 0.08 V+ - 0.36 0.6
1.8
UNITS V V V V V/C pA nA pA V/mV V/mV V dB dB dB V mV mV V V mA A
The q denotes the specifications which apply over the temperature range of - 40C TA 85C, VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted. (Note 3)
SYMBOL PARAMETER Input Offset Voltage VOS CONDITIONS VS = 5V VS = 3V VS = 5V, MS8 Package VS = 3V, MS8 Package (Note 4) (Note 5) VCM = 10V (Note 6) (Note 5) VS = 5V, VO = 0.25V to 4.5V, RL = 100k VS = 3V, VO = 0.25V to 2.5V, RL = 100k VCM = 0.2V to 4V, VS = 5V VCM = 0.2V to 10V, VS = 5V VS = 2.7V to 12V, VCM = VO = 0.5V No Load ISINK = 100A No Load ISOURCE = 100A (Note 5) (Note 6) MIN
q q q q q q q q q q q q q q q q q q q q q
VOS TC IB IOS AVOL
Input Offset Voltage Drift Input Bias Current Input Offset Current Large-Signal Voltage Gain Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Minimum Operating Supply Voltage Output Voltage Swing LOW Output Voltage Swing HIGH Short-Circuit Current Supply Current per Amplifier
CMRR PSRR VOL VOH ISC IS
55 30 0.2 88 88
TYP 200 250 200 250 0.4 250 275 20 215 115 106 75 99 2.6 60 245 V+ - 0.05 V+ - 0.19 0.9 1.5
MAX 475 575 575 675 2 1700 170
36
2.7 120 490
V+ - 0.10 V+ - 0.38 0.4
2.3
UNITS V V V V V/C pA nA pA V/mV V/mV V dB dB dB V mV mV mV mV mA A
4
LT1494/LT1495/LT1496
The q denotes the specifications which apply over the temperature range of - 40C TA 125C. VS = 5V, 0V; VS = 3V, 0V; VCM = VO = half supply, unless otherwise noted. (Note 3)
SYMBOL PARAMETER Input Offset Voltage VOS VOS TC IB IOS AVOL Input Offset Voltage Drift Input Bias Current Input Offset Current Large-Signal Voltage Gain Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Minimum Operating Supply Voltage Output Voltage Swing LOW Output Voltage Swing HIGH Supply Current per Amplifier CONDITIONS VS = 5V VS = 3V (Note 4) (Note 5) VCM = 10V (Note 6) (Note 5) VS = 5V, VO = 0.25V to 4.5V, RL = 100k VS = 3V, VO = 0.25V to 2.5V, RL = 100k VCM = 0.5V to 4V, VS = 5V VCM = 0.5V to 10V, VS = 5V VS = 2.7V to 12V, VCM = VO = 0.5V No Load ISINK = 100A No Load ISOURCE = 100A (Note 6) LT1494H/LT1495H/LT1496H TYP MAX 225 875 275 975 0.4 3 3.8 10 0.300 2 0.3 2 4 25 2 17 0.5 36 72 95 85 86 105 2.7 70 160 275 550 V+ - 140 V+ - 45 V+ - 450 V+ - 225 2 5 MIN UNITS V V V/C nA A nA V/mV V/mV V dB dB dB V mV mV mV mV A
ELECTRICAL CHARACTERISTICS
q q q q q q q q q q q q q q q q q q
CMRR PSRR VOL VOH IS
TA = 25C, VS = 15V, VCM = VO = 0V, unless otherwise noted.
SYMBOL PARAMETER VOS Input Offset Voltage IB IOS AVOL CMRR PSRR VOL VOH ISC IS Input Bias Current Input Offset Current Large-Signal Voltage Gain Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Output Voltage Swing LOW Output Voltage Swing HIGH Short-Circuit Current Supply Current per Amplifier CONDITIONS MS8 Package MIN TYP 200 200 25 20 360 120 120 -14.85 -14.75 14.89 14.81 1.5 1.4 MAX 575 675 1000 100 21 UNITS V V pA pA V/mV V dB dB V V V V mA A
VO = 10V, RL = 100k VCM = - 15V to 14V VS = 5V to 15V RL = 1M RL = 100k RL = 1M RL = 100k
100 - 15 100 96
-14.70 -14.50
14.78 14.62 0.7
2.0
5
LT1494/LT1495/LT1496
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the temperature range of 0C TA 70C, VS = 15V, VCM = VO = 0V, unless otherwise noted. (Note 3)
SYMBOL PARAMETER VOS Input Offset Voltage IB IOS AVOL CMRR PSRR VOL VOH ISC IS Input Bias Current Input Offset Current Large-Signal Voltage Gain Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Output Voltage Swing LOW Output Voltage Swing HIGH Short-Circuit Current Supply Current per Amplifier CONDITIONS MS8 Package
q q q q
MIN
VO = 10V, RL = 100k VCM = -14.8V to 14V VS = 5V to 15V RL = 1M RL = 100k RL = 1M RL = 100k
q q q q q q q q q q
60 - 14.8 98 94
TYP 225 225 250 20 240 120 120 -14.84 -14.73 14.88 14.79 1.3 1.6
MAX 625 725 1200 120 21
-14.67 -14.46
14.76 14.58 0.6
2.4
UNITS V V pA pA V/mV V dB dB V V V V mA A
The q denotes the specifications which apply over the temperature range of -40C TA 85C, VS = 15V, VCM = VO = 0V, unless otherwise noted. (Note 3)
SYMBOL PARAMETER VOS Input Offset Voltage IB IOS AVOL CMRR PSRR VOL VOH ISC IS Input Bias Current Input Offset Current Large-Signal Voltage Gain Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Output Voltage Swing LOW Output Voltage Swing HIGH Short-Circuit Current Supply Current per Amplifier CONDITIONS MS8 Package
q q q q
MIN
VO = 10V, RL = 100k VCM = -14.8V to 14V VS = 5V to 15V RL = 1M RL = 100k RL = 1M RL = 100k
q q q q q q q q q q
50 - 14.8 96 92
TYP 250 250 250 20 200 114 120 -14.83 -14.72 14.87 14.77 1.1 2.0
MAX 675 775 1700 170 21
-14.66 -14.44
14.74 14.54 0.4
3.0
UNITS V V pA pA V/mV V dB dB V V V V mA A
6
LT1494/LT1495/LT1496
ELECTRICAL CHARACTERISTICS
SYMBOL VOS IB IOS AVOL CMRR PSRR VOL VOH IS PARAMETER Input Offset Voltage Input Bias Current Input Offset Current Large-Signal Voltage Gain Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Output Voltage Swing LOW Output Voltage Swing HIGH Supply Current per Amplifier CONDITIONS
The q denotes the specifications which apply over the temperature range of -40C TA 125C. VS = 15V, VCM = VO = half supply, unless otherwise noted. (Note 3)
LT1494H/LT1495H/LT1496H TYP MAX 275 1100 3.8 10 0.3 2 21 70 -14.5 21 69 90 89 115 -14.80 -14.4 -14.69 -14.2 14.5 14.85 14.3 14.73 3 6 MIN UNITS V nA nA V/mV V dB dB V V V V A
q q q
VO = 10V, RL = 100k VCM = -14.5V to 14V VS = 5V to 15V RL = 1M RL = 100k RL = 1M RL = 100k
q q q q q q q q q
Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: The LT1494C/LT1495C/LT1496C and LT1494I/LT1495I/LT1496I are guaranteed functional over the operating temperature range of - 40C to 85C. The LT1494H/LT1495H/LT1496H are guaranteed functional over the operating temperature range of -40C to 125C. Note 3: The LT1494C/LT1495C/LT1496C are guaranteed to meet specified performance from 0C to 70C. The LT1494C/LT1495C/LT1496C are designed, characterized and expected to meet specified performance from
-40C to 85C but are not tested or QA sampled at these temperatures. The LT1494I/LT1495I/LT1496I are guaranteed to meet specified performance from -40C to 85C. The LT1494H/LT1495H/LT1496H are guaranteed to meet specified performance from -40C to 125C. Note 4: This parameter is not 100% tested. Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = 15V tests. Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = 15V tests.
TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Input Offset Voltage
20 18 16
PERCENT OF UNITS (%)
SUPPLY CURRENT PER AMPLIFIER (A)
2.0
CHANGE IN OFFSET VOLTAGE (V)
VS = 5V, 0V LT1494/LT1495/ LT1496 5700 OP AMPS
14 12 10 8 6 4 2 0 -400 -300 -200 -100 0 100 200 300 400 INPUT OFFSET VOLTAGE (V)
1495 G01
UW
Supply Current vs Temperature
2.5
Minimum Supply Voltage
200
150 100 TA = 85C 50 TA = 25C TA = - 40C
1.5 VS = 15V 1.0 VS = 2.5V 0.5
0
0 - 40 - 20
- 50
40 20 0 60 TEMPERATURE (C) 80 100
1
3 2 4 TOTAL SUPPLY VOLTAGE (V)
5
1495 G03
1495 G02
7
LT1494/LT1495/LT1496 TYPICAL PERFORMANCE CHARACTERISTICS
Output Saturation Voltage vs Load Current (Output Low)
1000 VS = 5V, 0V 1000
SATURATION VOLTAGE (mV)
SATURATION VOLTAGE (mV)
INPUT BIAS CURRENT (nA)
TA = 85C 100 TA = - 40C TA = 25C
10 0.1
1
10 100 LOAD CURRENT (A)
Gain and Phase Shift vs Frequency
50 40 30 VOLTAGE GAIN (dB) PHASE 20 10 GAIN 0 -10 - 20 - 30 0.1 1 FREQUENCY (kHz) 10
1495 G10
VS = 2.5V
NOISE VOLTAGE (nV/Hz)
80 PHASE SHIFT (DEG) 60 40 20 0 - 20 - 40
200 150 100 50 0 1 10 FREQUENCY (Hz) 100
1495 G08
CURRENT NOISE (fA/Hz)
Gain Bandwidth and Phase Margin vs Supply Voltage
3.5 PHASE MARGIN 3.0 GBW 60 OUTPUT VOLTAGE (2V/DIV) 70
FREQUENCY (kHz)
OVERSHOOT (%)
2.5 2.0 1.5 1.0 0.5 0 0 5 20 15 10 SUPPLY VOLTAGE (V) 25 30
1495 G11
8
UW
1495 G04
Output Saturation Voltage vs Load Current (Output High)
VS = 5V, 0V
300
Input Bias Current vs Common Mode Voltage
VS = 5V, 0V TA = 85C TA = 25C TA = - 40C
200
100
100 TA = 85C TA = - 40C TA = 25C
1.5 TA = 25C 0.5 TA = - 40C TA = 85C
1000
10 0.1
1
10 100 LOAD CURRENT (A)
1000
1495 G05
- 0.5
-1 0
12345678 COMMON MODE VOLTAGE (V)
9 10
1495 G06
Noise Voltage Spectrum
120 100
Noise Current Spectrum
100 VS = 2.5V
300 250
VS = 2.5V
80
60
40
20
0 1 10 FREQUENCY (Hz) 100
1495 G09
0.1Hz to 10Hz Output Voltage Noise
VS = 15V VCM = 0V 80 70 60
Capacitive Load Handling
VS = 2.5V
PHASE MARGIN (DEG)
50 40 30 20 10 0
AV = 1 50 40 30 AV = 5 20 AV = 10 10 0
TIME (1s/DIV)
1495 G07
10
100 1000 10000 CAPACITIVE LOAD (pF)
100000
1495 G12
LT1494/LT1495/LT1496 TYPICAL PERFORMANCE CHARACTERISTICS
Common Mode Rejection Ratio vs Frequency
100 COMMON MODE REJECTION RATIO (dB) 90 80 70 60 50 40 30 20 10 0 0.01 0.1 1 FREQUENCY (kHz) 10
1495 G13
POWER SUPPLY REJECTION RATIO (dB)
VS = 2.5V
OUTPUT IMPEDANCE (k)
Warm-Up Drift vs Time
40 30 OFFSET VOLTAGE CHANGE (V) 20 10 0 -10 -20 -30 - 40 0 20 40 60 80 100 120 140 160 180 200 TIME AFTER POWER-UP (SEC)
1495 G16
OFFSET VOLTAGE CHANGE (V)
VS = 15V
10 5 0 -5 -10 -15 - 20 0 1 4 3 OUTPUT VOLTAGE (V) 2 5 6
1495 G17
OFFSET VOLTAGE CHANGE (V)
VS = 2.5V
Small-Signal Response VS = 15V
VS = 15V RL = 1M CL = 100pF
UW
1495 G19
Power Supply Rejection Ratio vs Frequency
100 90 80 70 60 50 40 30 20 10 0 0.01 0.1 1 FREQUENCY (kHz) 10
1495 G14
Output Impedance vs Frequency
1000
VS = 2.5V POSITIVE SUPPLY
100
10
AV = 10
NEGATIVE SUPPLY
1
AV = 1
0.1 0.01
0.1 1 FREQUENCY (kHz)
10
1495 G15
Open-Loop Gain VS = 5V, 0V
20 15 VS = 5V, 0V
80 60 40 20 0 -20 - 40 - 60
Open-Loop Gain VS = 15V
VS = 15V
RL = 100k RL = 1M
RL = 1M RL = 100k
- 80 -20 -15 -10 -5 0 5 10 OUTPUT VOLTAGE (V)
15
20
1495 G18
Small-Signal Response VS = 5V, 0V
Large-Signal Response VS = 5V, 0V
VS = 5V, 0V RL = 1M CL = 100pF
1495 G20
VS = 5V, 0V RL = 1M CL = 100pF
1495 G21
9
LT1494/LT1495/LT1496
APPLICATIONS INFORMATION
Start-Up Characteristics Micropower op amps are sometimes not micropower during start-up, wreaking havoc on low current supplies. In the worst case, there may not be enough supply current available to take the system up to nominal voltages. Figure 1 is a graph of LT1495 supply current vs supply voltage for the three limit cases of input offset that could occur during start-up. The circuits are shown in Figure 2. One circuit creates a positive offset, forcing the output to come up saturated high. Another circuit creates a negative offset, forcing the output to come up saturated low, while the last brings up the output at half supply. In all cases, the supply current is well behaved. Supply current is highest with the output forced high, so if one amplifier is unused, it is best to force the output low or at half supply.
5
SUPPLY CURRENT PER AMPLIFIER (A)
4 OUTPUT HIGH
3
2 OUTPUT LOW 1 OUTPUT VS /2 0 0 1 2 3 4 SUPPLY VOLTAGE (V) 5
1495 F01
Figure 1. Start-Up Characteristics
VS
VS
VS
+ -
+ -
VS /2
+ -
1495 F02
OUTPUT HIGH
OUTPUT LOW
OUTPUT AT VS /2
Figure 2. Circuits for Start-Up Characteristics
10
U
W
U
U
Reverse Battery The LT1494/LT1495/LT1496 are protected against reverse battery voltages up to 18V. In the event a reverse battery condition occurs, the supply current is typically less than 100nA (inputs grounded and outputs open). For typical single supply applications with ground referred loads and feedback networks, no other precautions are required. If the reverse battery condition results in a negative voltage at either the input pins or output pin, the current into the pin should be limited by an external resistor to less than 10mA. Inputs While the LT1494/LT1495/LT1496 will function normally with its inputs taken above the positive supply, the common mode range does not extend beyond approximately 300mV below the negative supply at room temperature. The device will not be damaged if the inputs are taken lower than 300mV below the negative supply as long as the current out of the pin is limited to less than 10mA. However, the output phase is not guaranteed and the supply current will increase. Output The graph, Capacitive Load Handling, shows amplifier stability with the output biased at half supply. If the output is to be operated within about 100mV of the positive rail, the allowable load capacitance is less. With this output voltage, the worst case occurs at AV = 1 and light loads, where the load capacitance should be less than 500pF with a 5V supply and less than 100pF with a 30V supply. Rail-to-Rail Operation The simplified schematic, Figure 3, details the circuit design approach of the LT1494/LT1495/LT1496. The amplifier topology is a three-stage design consisting of a rail-to-rail input stage, that continues to operate with the inputs above the positive rail, a folded cascode second stage that develops most of the voltage gain, and a rail-torail common emitter stage that provides the current gain.
LT1494/LT1495/LT1496
APPLICATIONS INFORMATION
V+ D1 Q10 D2 D3 Q13 Q14 Q15 D7
IN
+
IN -
Q1 Q2
Q3
Q4
Q7
(V +) - 0.8V
Q16 Q11
Q17 D4 Q12 D5 D6
Q5 0.5 0.5
Q6 0.5 0.5
+
Q9 Q8 R1 R2 I2
1495 F03
Figure 3. Simplified Schematic
The input stage is formed by two diff amps Q1-Q2 and Q3Q6. For signals with a common mode voltage between VEE and (VCC - 0.8V), Q1 and Q2 are active. When the input common mode exceeds (VCC - 0.8V), Q7 turns on, diverting the current from diff amp Q1-Q2 to current mirror Q8-Q9. The current from Q8 biases on the other diff amp consisting of PNP's Q5-Q6 and NPN's Q3-Q4. Though Q5-Q6 are driven from the emitters rather than the base, the basic diff amp action is the same. When the common mode voltage is between (VCC - 0.8V) and VCC, devices Q3 and Q4 act as followers, forming a buffer between the amplifier inputs and the emitters of the Q5-Q6. If the common mode voltage is taken above VCC, Schottky diodes D1 and D2 reverse bias and devices Q3 and Q4 then
act as diodes. The diff amp formed by Q5-Q6 operates normally, however, the input bias current increases to the emitter current of Q5-Q6, which is typically 180nA. The graph, Input Bias Current vs Common Mode Voltage found in the Typical Performance Characteristics section, shows these transitions at three temperatures. The collector currents of the two-input pairs are combined in the second stage consisting of Q11 to Q16, which furnishes most of the voltage gain. Capacitor C1 sets the amplifier bandwidth. The output stage is configured for maximum swing by the use of common emitter output devices Q21 and Q22. Diodes D4 to D6 and current source Q15 set the output quiescent current.
+
U
W
U
U
+
I1 C1
Q20 Q21 OUT
Q19
Q18
Q22
11
LT1494/LT1495/LT1496
TYPICAL APPLICATIONS N
13A, 0kHz to 10kHz Voltage to Frequency Converter
270k 10M* 5V 390 VIN 0V TO 2.5V 562k* 100k 1/2 LT1495 3.9M*
-
0.0082F LTC(R)1440
1F
+
12pF 1N5712 1N4148 Q1: ZTX-849 *1% METAL FILM POLYSTYRENE 15k Q1 360k 3.6M TYP SELECT FOR 100Hz AT VIN = 0.025V 10M
39k
100pF
1/2 LT1495
6A, AV = 1000, Chopper Stabilized Amplifier
1 INPUT 2 1F 0.2F 5V
+
1M 1/2 LT1495
1F
2
-
- 5V
10M 1 10k
10M
1 5V
0.047F
10M
10M
12
+
-
1/2 LTC1441
1/2 LTC1441 - 5V
2
-
OUTPUT 0kHz TO 10kHz
0.05F
1M
-
1/2 LT1495 OUTPUT
+
10M
GAIN: 1000 OFFSET: 1V DRIFT: 50nV/C SUPPLY CURRENT: 5.5A BANDWIDTH: 0.2Hz CLOCK RATE: 4Hz CD4016 QUAD
1495 TA08
+
+
-
+
U
3.9M
20M 5V
1.2 REFERENCE LTC1440
0V - 2.5V = 0kHz - 10kHz SUPPLY CURRENT = 6.2A QUIESCENT = 13.3A AT f = 10kHz LINEARITY: 0.03% PSRR (4.4V TO 36V): 10ppm/V TEMPERATURE DRIFT: 250ppm/C
1495 TA07
10k
+
-
LT1494/LT1495/LT1496
TYPICAL APPLICATIONS N
6th Order 10Hz Elliptic Lowpass Filter
100k 15nF e in 15nF 10k 100nF 0 -10 -20
GAIN (dB)
215k
215k 30nF 215k 100nF
VS = 5V, 0V IS = 2A + ein /150k ZEROS AT 50Hz AND 60Hz
100k
80.6k 15nF 15nF
169k
169k 169k 30nF 100nF
100k
PACKAGE DESCRIPTION
MS8 Package 8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.118 0.004* (3.00 0.102)
0.007 (0.18) 0.021 0.006 (0.53 0.015)
* 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
U
U
Filter Frequency Response
+
1/2 LT1495
-
200k 10nF
-30 -40 -50 -60
10k 100nF
1
10 100 FREQUENCY (Hz)
1000
LT1495/96 * TA04
+
1/2 LT1495 OUTPUT
-
200k 10nF
1495 TA03
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 - 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
13
LT1494/LT1495/LT1496
PACKAGE DESCRIPTION
N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
0.400* (10.160) MAX 8 7 6 5
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
(
+0.035 0.325 -0.015 +0.889 8.255 -0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
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)
14
U
0.255 0.015* (6.477 0.381)
1
2
3
4
0.045 - 0.065 (1.143 - 1.651)
0.130 0.005 (3.302 0.127)
0.065 (1.651) TYP 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 0.003 (0.457 0.076)
N8 1098
)
0.100 (2.54) BSC
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)
SO8 1298
1
2
3
4
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
0.050 (1.270) BSC
LT1494/LT1495/LT1496
PACKAGE DESCRIPTION
N Package 14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
0.770* (19.558) MAX 14 13 12 11 10 9 8
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381) 0.005 (0.125) MIN 0.100 (2.54) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. BSC MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) +0.035 0.325 -0.015 +0.889 8.255 -0.381
(
)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0 - 8 TYP
0.016 - 0.050 (0.406 - 1.270)
*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
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.
U
0.255 0.015* (6.477 0.381)
1 0.130 0.005 (3.302 0.127) 0.020 (0.508) MIN
2
3
4
5
6
7
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076)
N14 1098
S Package 14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
0.337 - 0.344* (8.560 - 8.738) 14 13 12 11 10 9 8
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
5
6
7
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
0.050 (1.270) BSC
S14 1298
15
LT1494/LT1495/LT1496
TYPICAL APPLICATIONS N
Battery Current Monitor
IL CHARGE RSENSE 0.1
DISCHARGE RA RA
A2 1/2 LT1495
RA
RA
2N3904 DISCHARGE OUT RB
2N3904 CHARGE OUT RB
RELATED PARTS
PART NUMBER LTC 1440/41/42 LTC1443/44/45 LT1466/LT1467 LT1490A/LT1491A LTC1540 LT1636 LT1672/LT1673/LT1674 LT2078/LT2079 LT2178/LT2179 LT1782 LT1783
(R)
DESCRIPTION Micropower Single/Dual Comparators with 1% Reference Micropower Quad Comparators with 1% Reference 75A Dual/Quad Rail-to-Rail Input and Output Op Amps 50A Dual/Quad Rail-to-Rail Input and Output Op Amps Nanopower Single Comparator with 1% Reference Single Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amp 2A MAX, A V 5 Single/Dual/Quad Over-The-Top Precision Rail-to-Rail Input and Output Op Amps 55A Dual/Quad Single Supply Op Amps 17A Dual/Quad Single Supply Op Amps Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and Output Op Amp 1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and Output Op Amp in SOT-23
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417q (408) 432-1900 FAX: (408) 434-0507 q TELEX: 499-3977 q www.linear.com
U
0nA to 200nA Current Meter
100pF
5V
12V
R1 10M R4 10k INPUT CURRENT
-
A1 1/2 LT1495
- -
1/2 LT1495 1.5V R2 9k R3 2k FULL-SCALE ADJUST A 0A TO 200A
1495 TA06
- +
1/2 LT1495
+
+
1.5V IS = 3A WHEN IIN = 0 NO ON/OFF SWITCH REQUIRED
+
R VO = IL B RSENSE RA FOR RA = 1k, RB = 10k VO = 1V/A IL 1495 TA05
()
High Side Current Sense
VS = 2.7V TO 36V
RA 1k RSENSE 1
VO = IL
-
LT1494
( RB ) RS RA
FOR RA = 1k, RB = 10k, RS = 1 VO = 10 V/A IL + OUTPUT OFFSET IS * RB 10mV OUTPUT CLIPS AT VS - 2.4V
+
LOAD IL RB 10k VO _
1495 TA09
COMMENTS LTC1440: Single, LTC1441/42: Dual LTC1443: 1.182 Reference LTC1444/45: 1.221V Reference and Adjustable Hysteresis 390V VOS(MAX), Gain Bandwidth = 120kHz 950V VOS(MAX), Gain Bandwidth = 200kHz 350nA Supply Current 225V VOS(MAX), IS = 55A (MAX), Gain-Bandwidth = 200kHz Shutdown Pin, MSOP Decompensated Version of the LT1494/LT1495/LT1496 AV 5, Gain-Bandwidth = 12kHz 120V VOS(MAX), Gain Bandwidth = 200kHz 120V VOS(MAX), Gain Bandwidth = 60kHz SOT-23, 800V VOS(MAX) , IS = 55A (Max), Gain-Bandwidth = 200kHz, Shutdown Pin SOT-23, 800V VOS(MAX) , IS = 300A (Max), Gain-Bandwidth = 1.2MHz, Shutdown Pin
149456fb LT/TP 0801 1.5K REV B * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1997

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