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LT1797 10MHz, Rail-to-Rail Input and Output Op Amp in SOT-23
FEATURES
s s s s s s s s s s s s s
DESCRIPTIO
Rail-to-Rail Input and Output Small SOT-23 Package Gain Bandwidth Product: 10MHz -40C to 85C Operation Slew Rate: 2.25V/s Low Input Offset Voltage: 1.5mV Max High Output Current: 25mA Min Specified on 3V, 5V and 5V Supplies High Voltage Gain: 1000V/mV 10k Load High CMRR: 88dB Min High PSRR: 80dB Min Input Bias Current: 300nA Max Input Offset Current: 25nA Max
The LT(R)1797 is a unity-gain stable 10MHz op amp available in the small SOT-23 package that operates on all single and split supplies with a total voltage of 2.7V to 12V. The amplifier draws 1mA of quiescent current and has a slew rate of 2.25V/s. The input common mode range of the LT1797 includes both rails, making it ideal for current sensing applications. The input stage incorporates phase reversal protection to prevent false outputs from occurring when the inputs are driven beyond the supplies. Protective resistors are included in the input leads so that current does not become excessive when the inputs are forced above or below the supplies. The output of the LT1797 can swing to within 50mV of V + and 8mV of V - without drawing excess current in either condition. The amplifier can drive loads up to 25mA and still maintain rail-to-rail capability. The LT1797 op amp is available in the space saving 5-lead SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s s s s
Portable Instrumentation Rail-to-Rail Buffer Amplifiers Low Voltage Signal Processing Driving A/D Converters Battery-Powered Systems
TYPICAL APPLICATION
Fast Compact - 48V Current Sense
VOUT = 3V - 0.1 * ISENSE ISENSE = 0A TO 30A ACCURACY 3% VOUT Q1 FMMT493 30.1 1% 3.3k 0805 x3 R1 4.7k 1k 1% VS = 3V
R1 REDUCES Q1 DISSIPATION LT1797
0.1F SETTLES TO 1% IN 2s, 1V OUTPUT STEP
BZX84C6V8 VZ = 6.8V -48V SUPPLY (-42V TO -56V)
0.003 1% 3W
-
ISENSE
+
1797 TA01
-48V LOAD
U
+
-
U
U
1
LT1797
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW OUT 1 V- 2 +IN 3
+-
Total Supply Voltage (V + to V -) ........................... 12.6V Input Differential Voltage ..................................... 12.6V Input Current ..................................................... 10mA Output Short-Circuit Duration (Note 2) ........ Continuous Operating Temperature Range (Note 3) ............................................. - 40C to 85C Specified Temperature Range ................. - 40C to 85C Junction Temperature........................................... 150C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
ORDER PART NUMBER
5 V+
LT1797CS5 LT1797IS5 S5 PART MARKING LTLM LTTL
4 -IN
S5 PACKAGE 5-LEAD PLASTIC SOT-23
TJMAX = 150C, JA = 250C/ W
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, pulse power tested, unless otherwise specified. (Note 3)
SYMBOL PARAMETER VOS Input Offset Voltage 0C TA 70C -40C TA 85C Input Offset Voltage Drift (Note 4) IB Input Bias Current Input Bias Current Drift IOS Input Offset Current Input Noise Voltage en in RIN CIN CMRR Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Common Mode Rejection Ratio Input Voltage Range AVOL Large-Signal Voltage Gain VS = 3V, VO = 0.5V to 2.5V, RL = 10k
q q q q
CONDITIONS
MIN
TYP 1
MAX 1.5 2.5 3.0 20 100 25 25
UNITS mV mV mV V/C nA nA nA/C nA nA VP-P nV/Hz pA /Hz pA /Hz k M pF dB dB
5 -300 -150 50 0.1 10 10 1.5 20 0.23 0.15 200 330 100 4 96 72
VCM = V - VCM = V + VCM = V - VCM = V + 0.1Hz to 10Hz f = 10kHz f = 10kHz f = 10kHz, VCM = VCC - 0.3V Differential Common Mode, VCM = 0V to VS - 1.2V VCM = 0V to VS - 1.2V VCM = 0V to VS
q q q q q
q q q
88 64 0 200 150 400 300
VS 1000 1000
V/mV V/mV V/mV V/mV
VS = 5V, VO = 0.5V to 4.5V, RL = 10k
q
2
U
V
W
U
U
WW
W
LT1797
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, pulse power tested, unless otherwise specified. (Note 3)
SYMBOL PARAMETER PSRR VOL Power Supply Rejection Ratio Minimum Supply Voltage Output Voltage Swing LOW No Load, Input Overdrive = 30mV ISINK = 5mA ISINK = 10mA No Load, Input Overdrive = 30mV ISOURCE = 5mA ISOURCE = 10mA VS = 5V VS = 3V
q
CONDITIONS VS = 2.7V to 12V, VCM = VO= 1V
q q q q q
MIN 80
TYP 90 2.5 8 80 150
MAX 2.7 15 160 250
UNITS dB V mV mV mV V V V mA mA
VOH
Output Voltage Swing HIGH
q VS - 0.14 VS - 0.05 q VS - 0.30 VS - 0.2 q VS - 0.39 VS - 0.3
ISC IS GBW
Short-Circuit Current Supply Current Gain Bandwidth Product (Note 5)
25 15
45 25 1.1 1.5 2.0
mA mA MHz MHz MHz V/s V/s V/s ns ns s % kHz
f = 100kHz 0C TA 70C - 40C TA 85C AV = -1 0C TA 70C - 40C TA 85C 10% to 90%, 0.1V Step, RL = 10k 10% to 90%, 0.1V Step, RL = 10k VS = 5V, VOUT = 2V to 0.1%, AV = -1 VS = 3V, VOUT = 1.8VP-P, AV = 1, RL = 10k, f = 1kHz VOUT = 2VP-P
q q q q
6.0 5.0 4.5 1.3 1.1 1.0
10
SR
Slew Rate (Note 5)
2.25
tr tf tS THD FPBW
Output Rise Time Output Fall Time Settling Time Distortion Full-Power Bandwidth (Note 6)
55 55 1.6 0.001 360
The q denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25C. VS = 5V, VCM = 0V, VOUT = 0V, pulse power tested unless otherwise specified. (Note 3)
SYMBOL PARAMETER VOS Input Offset Voltage 0C TA 70C - 40C TA 85C Input Offset Voltage Drift (Note 4) IB Input Bias Current Input Bias Current Drift IOS Input Offset Current Input Noise Voltage en in RIN CIN Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range
q q q q
CONDITIONS
MIN
TYP 1
MAX 1.5 2.5 3.0 20 100 25 25
UNITS mV mV mV V/C nA nA nA/C nA nA VP-P nV/Hz pA/Hz pA/Hz k M pF
5 -300 -150 50 0.1 10 10 1 20 0.23 0.15 200 330 100 4 -5
VCM VCM = V + VCM VCM = V + 0.1Hz to 10Hz f = 10kHz f = 10kHz f = 10kHz, VCM = 4.7V Differential Common Mode, VCM = - 5V to 3.8V = V-
= V-
q q q q q
5
V
3
LT1797
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25C. VS = 5V, VCM = 0V,VOUT = 0V, pulse power tested unless otherwise specified. (Note 3)
SYMBOL PARAMETER CMRR AVOL VOL Common Mode Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing LOW CONDITIONS VCM = - 5V to 3.8V VCM = - 5V to 5V VO = 4V, RL = 10k
q q q
MIN 83 66 400 300
TYP 96 76 1000 - 4.99 - 4.92 - 4.85
MAX
UNITS dB dB V/mV V/mV
No Load, Input Overdrive = 30mV ISINK = 5mA ISINK = 10mA No Load, Input Overdrive = 30mV ISOURCE = 5mA ISOURCE = 10mA Short to GND VS = 1.35V to 6V
q q q q q q
- 4.98 - 4.87 - 4.79
V V V V V V mA dB
VOH
Output Voltage Swing HIGH
4.84 4.70 4.61 30 80
4.95 4.80 4.70 50 90 1.40 2.25 2.70
ISC PSRR IS GBW
Short-Circuit Current (Note 2) Power Supply Rejection Ratio Supply Current
q q
mA mA MHz MHz MHz V/s V/s V/s ns ns s kHz
Gain Bandwidth Product
f = 100kHz 0C TA 70C - 40C TA 85C AV = - 1, RL = , VO = 4V, Measured at VO = 2V 0C TA 70C - 40C TA 85C 10% to 90%, 0.1V Step, RL = 10k 10% to 90%, 0.1V Step, RL = 10k VOUT = 4V to 0.1%, AV = 1 VOUT = 8VP-P
q q q q
6.5 5.5 5.0 1.50 1.25 1.10
11
SR
Slew Rate
2.50
tr tf tS FPBW
Output Rise Time Output Fall Time Settling Time Full-Power Bandwidth (Note 6)
55 55 2.6 100
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. Note 3: The LT1797C is guaranteed to meet 0C to 70C specifications and is designed, characterized and expected to meet the extended temperature limits, but is not tested at -40C and 85C. The LT1797I is guaranteed to meet specified performance from - 40C to 85C.
Note 4: This parameter is not 100% tested. Note 5: VS = 3V limit guaranteed by correlation to 5V tests. Note 6: Full-power bandwidth is calculated from the slew rate: FPBW = SR/2VP
4
LT1797 TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
1.8 1.6 TA = 125C INPUT OFFSET VOLTAGE CHANGE (V)
INPUT BIAS CURRENT (nA)
SUPPLY CURRENT (mA)
1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 1 2 3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V)
1797 G01
TA = 25C TA = -55C
Output Saturation Voltage vs Load Current (Output High)
1 OUTPUT SATURATION VOLTAGE (V) VS = 2.5V VOD = 30mV
OUTPUT SATURATION VOLTAGE (V)
0.1
0.1
TA = 25C TA = 125C TA = -55C
OUTPUT SATURATION VOLTAGE (mV)
0.01 1
10 100 1m SOURCING LOAD CURRENT (A)
Output Short-Circuit Current vs Temperature
50 45
OUTPUT CURRENT (mA)
SOURCING CURRENT NOISE VOLTAGE (1V/DIV)
INPUT NOISE VOLTAGE DENSITY (nV/Hz)
VS = 2.5V
40 SINKING CURRENT 35 30 25 20 -50 -25
50 25 75 0 TEMPERATURE (C)
UW
1797 G04
Minimum Supply Voltage
300 200 100 0 -100 -200 -300 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 TOTAL SUPPLY VOLTAGE (V)
1797 G02
Input Bias Current vs Common Mode Voltage
100 50 0 -50 -100 -150 -200 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 COMMON MODE VOLTAGE (V)
1797 G03
VS = 5V, 0V
TA = -55C TA = 25C TA = 125C
TA = 125C TA = 25C
TA = -55C
Output Saturation Voltage vs Load Current (Output Low)
1 VS = 2.5V VOD = 30mV
Output Saturation Voltage vs Input Overdrive
150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 VS = 2.5V IOUT = 0
0.01
TA = 125C TA = 25C
TA = -55C
OUTPUT HIGH
OUTPUT LOW 0 10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV)
1797 G06
10m
0.001 1 100 1m 10 SINKING LOAD CURRENT (A) 10m
1797 G05
0.1Hz to 10Hz Noise Voltage
VS = 5V
100
Input Noise Voltage Density vs Frequency
VS = 2.5V
80
60
40
20
0
100 125
0
1
2
3
456 TIME (SEC)
7
8
9
10
10
100
1k 10k FREQUENCY (Hz)
100k
1797 G09
1797 G07
1797 G08
5
LT1797 TYPICAL PERFOR A CE CHARACTERISTICS
Input Noise Current Density vs Frequency
1.2
INPUT NOISE CURRENT DENSITY (pA/Hz)
1.0 0.8
GAIN (dB)
50 40 30 20 10 0 -10 -20 GAIN PHASE
60 40
PHASE (DEG)
GAIN BANDWIDTH PRODUCT (MHz)
0.6 0.4 0.2 0 10
100
1k 10k FREQUENCY (Hz)
Slew Rate vs Temperature
3.5 VS = 2.5V
GAIN BANDWIDTH PRODUCT (MHz)
3.0 RISING
PHASE MARGIN
50 45 40 35 30
GAIN BANDWIDTH PRODUCT (MHz)
SLEW RATE (V/s)
2.5 FALLING 2.0
1.5
1.0 -50
-25
50 25 0 75 TEMPERATURE (C)
PSRR vs Frequency
90
POWER SUPPLY REJECTION RATIO (dB)
80 70 60 50 40 30 20 10 0 -10 1k 10k POSITIVE SUPPLY
COMMON MODE REJECTION RATIO (dB)
NEGATIVE SUPPLY
80 70 60 50 40 30 20 10 1k 10k 100k 1M FREQUENCY (Hz) 10M
1797 G17
OUTPUT IMPEDANCE ()
100k 1M FREQUENCY (Hz)
6
UW
VS = 2.5V
1797 G10
Gain and Phase Shift vs Frequency
70 60 VS = 2.5V 100 80
12.0 11.5 11.0 10.5 10.0
Gain Bandwidth Product vs Temperature
f = 100kHz
VS = 5V
20 0 -20 -40 -60 -80 100k 1M 10M FREQUENCY (Hz)
VS = 2.5V 9.5 9.0 8.5 8.0 - 50 - 25 0 75 50 25 TEMPERATURE (C) 100 125
100k
-30 10k
-100 100M
1797 G11
1797 G12
Gain Bandwidth Product and Phase Margin vs Supply Voltage
f = 100kHz RF = RG = 1k 60 55
Gain Bandwidth Product and Phase Margin vs RF and RG
VS = 5V 60 50 PHASE MARGIN 40
PHASE MARGIN (DEG)
PHASE MARGIN (DEG)
30 20 10 14 13 12 11 10 1k 10k RF = RG = () 100k
1797 G15
13 12 11 10 9 8 GAIN BANDWIDTH PRODUCT
GAIN BANDWIDTH PRODUCT
100
125
0
1
2
3 4 5 6 7 8 9 10 11 12 TOTAL SUPPLY VOLTAGE (V)
1797 G14
1797 G13
CMRR vs Frequency
VS = 2.5V 110 100 90 VS = 2.5V 100
Output Impedance vs Frequency
VS = 2.5V GAIN = 100
10
1 GAIN = 10
0.1
10M
1797 G16
0.01 100
1k
10k 100k FREQUENCY (Hz)
1M
10M
1797 G18
LT1797 TYPICAL PERFOR A CE CHARACTERISTICS
Open-Loop Gain
CHANGE IN INPUT OFFSET VOLTAGE (50V/DIV)
OUTPUT STEP (V)
1 0 -1 -2 -3 AV = 1 AV = -1
OVERSHOOT (%)
RL = 50k RL = 10k RL = 2k
-5 -4 -3 -2 -1 0 1 2 3 OUTPUT VOLTAGE (V)
Undistorted Output Swing vs Frequency
12 11 10 9 AV = 1 VS = 5V
OUTPUT SWING (VP-P)
THD + NOISE (%)
7 6 5 4 3 2 1 0 100 1k 10k 100k FREQUENCY (Hz) 1M
1797 G22
0.01
AV = -1
THD + NOISE (%)
8
VS = 1.5V
Total Harmonic Distortion + Noise vs Output Voltage Amplitude
10 f = 1kHz VCM = HALF SUPPLY RL = 10k AV = -1 VS = 3V, 0V 0.1 AV = 1 VS = 1.5V
1
THD + NOISE (%)
0.01 AV = 1 VS = 3V, 0V 0 AV = -1 VS = 1.5V 3
1797 G25
0.001
1 2 OUTPUT VOLTAGE (VP-P)
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4 5
Settling Time to 0.1% vs Output Step
VS = 5V 4 3 AV = 1 2 AV = -1 VS = 5V 50 45 40 35 30 25 20 15 10 5 0
Capacitive Load Handling Overshoot vs Capacitive Load
VS = 2.5V
AV = 1
AV = 2
AV = 5 AV = 10 10 100 1000 CAPACITIVE LOAD (pF) 10000
1797 G21
-4 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 SETTLING TIME (s)
1797 G20
1797 G19
Total Harmonic Distortion + Noise vs Frequency
1 RL = 10k VS = 3V, 0V VOUT = 1.8VP-P VCM = 1V
10
Total Harmonic Distortion + Noise vs Load Resistance
VS = 3V TOTAL AV = 1 f = 1kHz
0.1
1
0.1
VS = 3V, 0V VIN = 1.8VP-P VCM = 1.5V VS = 3V, 0V VIN = 1.8VP-P VCM = 1V 0.1 1 10 LOAD RESISTANCE TO GROUND (k) 100
0.001
AV = 1
0.01
0.0001 10
100
1k 10k FREQUENCY (Hz)
100k
1797 G23
0.001
1797 G24
Large-Signal Response
Small-Signal Response
VS = 2.5V AV = 1
1797 G26
VS = 2.5V AV = 1 RL = 10k
1797 G27
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LT1797
APPLICATIO S I FOR ATIO
Supply Voltage
The positive supply pin of the LT1797 should be bypassed with a small capacitor (about 0.1F) within an inch of the pin. When driving heavy loads an additional 4.7F electrolytic capacitor should be used. When using split supplies the same is true for the negative supply pin. Inputs The LT1797 is fully functional for an input signal range from the negative supply to the positive supply. Figure 1 shows a simplified schematic of the amplifier. The input stage consists of two differential amplifiers, a PNP stage Q3/Q4 and an NPN stage Q1/Q2 that are active over different ranges of input common mode voltage. The PNP differential pair is active for input common mode voltages VCM between the negative supply to approximately 1.2V below the positive supply. As VCM moves closer toward the positive supply, the transistor QB1 will steer the tail current I1 to the current mirror Q5/Q6, activating the NPN differential pair and the PNP pair becomes inactive for the rest of the input common mode range up to the positive supply. The input offset voltage and the input bias current are dependent on which input stage is active. The input offset voltage is trimmed on a single 5V supply with the common mode at 1/2 supply and is typically 1mV with the PNP stage active. The input offset of the NPN stage is untrimmed and is typically 1.5mV. The input bias current polarity depends on the input common mode voltage. When the PNP differential pair is active, the input bias currents flow out of the input pins. They flow in the opposite direction when the NPN input stage is active. The offset error due to the input bias currents can be minimized by equalizing the noninverting and inverting source impedance.
8
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The input stage of the LT1797 incorporates phase reversal protection to prevent false outputs from occurring when the inputs are driven up to 5V beyond the rails. Protective resistors are included in the input leads so that current does not become excessive when the inputs are forced beyond the supplies or when a large differential signal is applied. Output The output is configured with a pair of complementary common emitter stages Q19/Q20, which enable the output to swing from rail-to-rail. The output voltage swing of the LT1797 is affected by input overdrive as shown in the Typical Performance Characteristics. When monitoring input voltages within 50mV of V + or within 8mV of V -, some gain should be taken to keep the output from clipping. The output of the LT1797 can deliver large load currents; the short-circuit current limit is typically 50mA at 5V. Take care to keep the junction temperature of the IC below the absolute maximum rating of 150C. The output of the amplifier has reverse biased diodes to each supply. If the output is forced beyond either supply, unlimited current will flow through these diodes. The LT1797 can drive capacitive loads up to 200pF on a single 5V supply in a unity gain configuration. When there is a need to drive larger capacitive loads, a resistor of a couple hundred ohms should be connected between the output and the capacitive load. The feedback should still be taken from the output so that the resistor isolates the capacitive load to ensure stability. The low input bias current of the LT1797 makes it possible to use high value feedback resistors to set the gain. However, care must be taken to insure that the pole formed by the feedback resistors and the total capacitance at the inverting input does not degrade stability.
W
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LT1797
APPLICATIO S I FOR ATIO
Distortion
There are two main contributors to distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by nonlinear common mode rejection. If the op amp is operating in the inverting mode, there is no common mode induced distortion. If the op amp is operating in the PNP input stage (input is not within 1.2V of V+), the CMRR is
I1
R1
R2
BIAS
QB1 Q13 R5 Q14
-IN D1 R6 +IN D2
Q1
Q2 Q9 Q10 I2 I3 R7 +1 R8 +1 CM OUT Q3 Q4 I4 Q7 Q8 Q11 Q12 C1 I5
Q5
Q6 R3 R4 I6
Figure 1. Simplified Schematic
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very good, typically 95dB. When the LT1797 switches between input stages there is significant nonlinearity in the CMRR. Lower load resistance increases the output crossover distortion, but has no effect on the input stage transition distortion. For lowest distortion the LT1797 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V+ - 1.2V). See the Typical Performance Characteristic curves.
Q18 Q17 1/2 SUPPLY Q15 Q16 Q19 I7 C2 Q20
1797 F01
W
UU
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LT1797
TYPICAL APPLICATIO S
3V R2 1k R3 10k C1 0.1F R1 100k 3V *CP = SUM OF PHOTODIODE CAPACITANCE, PARASITIC LAYOUT CAPACITANCE AND LT1797 INPUT CAPACITANCE 10pF. R6 330 C3 1000pF TRANSIMPEDANCE GAIN: AZ = 10M. R6, C3 LIMIT THE NOISE BANDWIDTH TO 500kHz. OUTPUT NOISE 1.8mVRMS. R1, CP AND LT1797 GBW SET UPPER LIMIT ON BANDWIDTH. R4, C2 SET LOWER 1.6kHz LIMIT ON GAIN OF 101. R5 R4 100k 1k C2 0.1F
1797 TA02
PHOTODIODE SFH213FA
Ultra-Low Noise, 5V Supply, Rail-to-Rail Output Amplifier
5V IN
+
LT1028
-
-5V
R4 10
10
U
CP*
Single Supply Hi-Gain 80kHz Photodiode Amplifier
+
LT1797
-
5V
+
R5 1k R2 4.99k LT1797 OUT TOTAL INPUT VOLTAGE NOISE 0.94nV/Hz (INCLUDING 10 RESISTOR) BANDWIDTH 40kHz AV = 500
-
-5V
C1 2200pF
R1 10k R3 4.99k
1797 TA03
LT1797
PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted.
S5 Package 5-Lead Plastic SOT-23
(LTC DWG # 05-08-1633)
2.80 - 3.00 (0.110 - 0.118) (NOTE 3)
2.60 - 3.00 (0.102 - 0.118) 1.50 - 1.75 (0.059 - 0.069)
1.90 (0.074) REF 0.00 - 0.15 (0.00 - 0.006)
0.95 (0.037) REF
0.90 - 1.45 (0.035 - 0.057)
0.35 - 0.55 (0.014 - 0.022)
0.09 - 0.20 (0.004 - 0.008) (NOTE 2)
0.35 - 0.50 0.90 - 1.30 (0.014 - 0.020) (0.035 - 0.051) FIVE PLACES (NOTE 2) S5 SOT-23 0599
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
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.
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LT1797
TYPICAL APPLICATIO
1MHz Photodiode Transimpedance Amplifier
3pF
100mV/DIV
100k V+ PHOTODIODE SFH213FA SIEMENS/INFINEON
-
LT1797
+
V-
RELATED PARTS
PART NUMBER LT1630/LT1631 LT1638/LT1639 LT1783 LT1880 DESCRIPTION Dual/Quad 30MHz, 10V/s Rail-to-Rail Input and Output Op Amps Dual/Ouad 1.2MHz, 0.4V/s, Over-The-TopTM Micropower Rail-to-Rail Input and Output Op Amps Micropower Over-The-Top SOT-23 Rail-to-Rail Input and Output Op Amp SOT-23 Rail-to-Rail Output, Picoamp Input Current Precision Op Amp COMMENTS High DC Accuracy, 525V VOS(MAX), 70mA Output Current, Max Supply Current 4.4mA per Amp 170A Supply Current, Single Supply Input Range -0.4V to 44V, Rail-to-Rail Input and Output. SOT-23 Package, Micropower 220A per Amplifier, Rail-to-Rail Input and Output, 1.2MHz Gain Bandwidth 150mV Maximum Offset Voltage, 900pA Maximum Bias Current, 1.1MHz Gain Bandwidth, -40C to 85C Temperature Range
Over-The-Top is a trademark of Linear Technology Corporation.
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
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Response of Photodiode Amplifier
2s/DIV
VS = 1.5V TO 5V
1797 TA04
Rise Time vs Supply Voltage (600mV Output Step) Supply Voltage 1.5V 2.5V 5V 10% to 90% Rise Time 830ns 800ns 700ns
1797F LT/TP 0401 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 2000

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