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FEATURES
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LT1789-1/LT1789-10 Micropower, Single Supply Rail-to-Rail Output Instrumentation Amplifiers DESCRIPTION
The LT(R)1789-1/LT1789-10 are micropower, precision instrumentation amplifiers that are optimized for single supply operation from 2.2V to 36V. The quiescent current is 95A max, the inputs common mode to ground and the output swings within 110mV of ground. The gain is set with a single external resistor for a gain range of 1 to 1000 for the LT1789-1 and 10 to 1000 for the LT1789-10. The high accuracy of the LT1789-1 (40ppm maximum nonlinearity and 0.25% max gain error) is unmatched by other micropower instrumentation amplifiers. The LT1789-10 maximizes both the input common mode range and dynamic output range when an amplification of 10 or greater is required, allowing precise signal processing where other instrumentation amplifiers fail to operate. The LT1789-1/LT1789-10 are laser trimmed for very low input offset voltage, low input offset voltage drift, high CMRR and high PSRR. The output can handle capacitive loads up to 400pF (LT1789-1), 1000pF (LT1789-10) in any gain configuration while the inputs are ESD protected up to 10kV (human body). The LT1789-1/LT1789-10 are offered in the 8-pin SO package, requiring significantly less PC board area than discrete multi op amp and resistor designs.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
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Micropower: 95A Supply Current Max Low Input Offset Voltage: 100V Max Low Input Offset Voltage Drift: 0.5V/C Max Single Gain Set Resistor: G = 1 to 1000 (LT1789-1) G = 10 to 1000 (LT1789-10) Inputs Common Mode to V- Wide Supply Range: 2.2V to 36V Total Supply CMRR at G = 10: 96dB Min Gain Error: G = 10, 0.25% Max Gain Nonlinearity: G = 10, 40ppm Max Input Bias Current: 40nA Max PSRR at G = 10: 100dB Min 1kHz Voltage Noise: 48nV/Hz 0.1Hz to 10Hz Noise: 1.5VP-P
APPLICATIONS
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Portable Instrumentation Bridge Amplifiers Strain Gauge Amplifiers Thermocouple Amplifiers Differential to Single-Ended Converters Medical Instrumentation
TYPICAL APPLICATION
0.5A to 4A Voltage Controlled Current Source
C1 4700pF VS
VIN R2 10k
VS = 3.3V TO 32V VIN ILOAD = RSENSE * 10 = 1A PER VOLT AS SHOWN RISE TIME 250s, 10% TO 90%, 1A TO 2A OUTPUT STEP INTO 0.25 LOAD
+
3
-
4
R1 90.9k
VS 2 7 LT1636 5 6
C3 0.1F R3 100 VS 7 R4 10k 6 REF 1 5 4
8k
120 TIP127*
+
3 8
3 1 2 4
* ENSURE ADEQUATE POWER DISSIPATION CAPABILITY AT HIGHER VOLTAGES, CURRENTS AND DUTY CYCLES RSENSE* 0.1 ILOAD
LT1789-1
C2 3300pF
-
2
RLOAD*
1789 TA01
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LT1789-1/LT1789-10 ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW RG 1 -IN 2 +IN 3 -VS 4 8 RG 7 +VS 6 OUT 5 REF
Supply Voltage (V+ to V-)..........................................36V Input Differential Voltage ..........................................36V Input Current (Note 3) ......................................... 20mA Output Short-Circuit Duration .......................... Indefinite Operating Temperature Range .................-40C to 85C Specified Temperature Range (Note 4) LT1789C-1, LT1789C-10 .......................-40C to 85C LT1789I-1, LT1789I-10 ........................-40C to 85C Storage Temperature Range .................. -65C to 150C Lead Temperature (Soldering, 10 sec)................... 300C
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150C, JA = 190C/W
ORDER INFORMATION
LEAD FREE FINISH LT1789CS8-1#PBF LT1789IS8-1#PBF LT1789CS8-10#PBF LT1789IS8-10#PBF LEAD BASED FINISH LT1789CS8-1 LT1789IS8-1 LT1789CS8-10 LT1789IS8-10 TAPE AND REEL LT1789CS8-1#TRPBF LT1789IS8-1#TRPBF LT1789CS8-10#TRPBF LT1789IS8-10#TRPBF TAPE AND REEL LT1789CS8-1#TR LT1789IS8-1#TR LT1789CS8-10#TR LT1789IS8-10#TR PART MARKING 17891 1789I1 178910 789I10 PART MARKING 17891 1789I1 178910 789I10 PACKAGE DESCRIPTION 8-Lead Plastic SO 8-Lead Plastic SO 8-Lead Plastic SO 8-Lead Plastic SO PACKAGE DESCRIPTION 8-Lead Plastic SO 8-Lead Plastic SO 8-Lead Plastic SO 8-Lead Plastic SO TEMPERATURE RANGE -40C to 85C -40C to 85C -40C to 85C -40C to 85C TEMPERATURE RANGE -40C to 85C -40C to 85C -40C to 85C -40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
supply, TA = 25C, unless otherwise noted.
SYMBOL PARAMETER G Gain Range Gain Error (Note 6)
3V AND 5V ELECTRICAL CHARACTERISTICS
CONDITIONS LT1789-1, G = 1 + (200k/RG) LT1789-10, G = 10 * [1+ (200k/RG)] G = 1, VO = 0.1V to (+VS) - 1V LT1789-1, VO = 0.1V to (+VS) - 0.3V LT1789-10, VO = 0.2V to (+VS) - 0.3V G = 10 (Note 2) G = 100 (Note 2) G = 1000 (Note 2) G = 1, VO = 0.1V to (+VS) - 1V LT1789-1, VO = 0.1V to (+VS) - 0.3V LT1789-10, VO = 0.2V to 4.7V, VS = 5V (Note 8) G = 10 G = 100 G = 1000 MIN 1
VS = 3V, 0V; VS = 5V, 0V; RL = 20k, VCM = VREF = half
LT1789-1 TYP MAX 1000 10 0.02 0.20 1000 % MIN LT1789-10 TYP MAX UNITS
Gain Nonlinearity (Note 6)
0.06 0.06 0.13 35
0.25 0.27 100
0.01 0.09 0.16
0.25 0.30
% % % ppm
12 18 90
40 75
15 20 100
100 100
ppm ppm ppm
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LT1789-1/LT1789-10
supply, TA = 25C, unless otherwise noted.
SYMBOL PARAMETER VOST VOSI VOSO IOS IB en Input Offset Voltage Output Offset Voltage Input Offset Current Input Bias Current Input Noise Voltage, RTI (Referred to Input)
3V AND 5V ELECTRICAL CHARACTERISTICS
CONDITIONS G = 1000 G = 1 (LT1789-1), G =10 (LT1789-10) (Note 6) (Note 6) G = 1, fO = 0.1Hz to 10Hz G = 10 G = 100, 1000 fO = 1kHz (Note 7) fO = 0.1Hz to 10Hz fO = 1kHz VIN = 0V to (+VS) - 1V (Note 6) Differential Common Mode 0 1k Source Imbalance (Note 6) LT1789-1,VCM = 0V to (+VS) - 1V LT1789-10, VCM = 0V to (+VS) - 1.2V G=1 G = 10 G = 100 G = 1000 VS = 2.5V to 12.5V, VCM = VREF = 1V G=1 G = 10 G = 100 G = 1000 (Note 7) (Note 7) (Note 7) Short to GND Short to +VS G=1 G = 10 G = 100 G = 1000 G = 10, VOUT = 0.5V to 4.5V 4V Step VREF = 0V 0.75 MIN Total Input Referred Offset Voltage VOST = VOSI + VOSO/G
VS = 3V, 0V; VS = 5V, 0V; RL = 20k, VCM = VREF = half
LT1789-1 TYP 15 150 0.2 19 5.0 1.5 1.0 48 330 16 62 1.6 1.6 1.6 +VS - 1 0 0.75 85 MAX 100 750 4 40 MIN LT1789-10 TYP 20 650 0.2 19 4.6 1.1 52 270 16 62 1.6 1.6 1.6 +VS - 1.2 90 MAX 160 3000 4 40 UNITS V V nA nA VP-P VP-P VP-P nV/Hz nV/Hz pAP-P fA/Hz G pF pF V
Total RTI Noise = eni2 + (eno/G)2 eni eno in RIN CIN VCM CMRR Input Noise Voltage Density, RTI Input Noise Current Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Output Noise Voltage Density, RTI fO = 1kHz (Note 3)
79 96 100 100 90 100 102 102
88 106 114 114 100 113 116 116 2.2 67 54 2.5 95 100
88 98 98
105 113 113
dB dB dB dB dB dB dB dB 2.5 95 110 V A mV V mA mA kHz kHz kHz kHz V/s s k A
PSRR
Power Supply Rejection Ratio
94 102 102
109 120 120 2.2 67 62
Minimum Supply Voltage IS VOL VOH ISC BW Supply Current Output Voltage Swing LOW Output Voltage Swing HIGH Short-Circuit Current Bandwidth
+VS - 0.3 +VS - 0.19 2.2 8.5 60 30 3 0.2 0.023 240 220 2.7 1 0.0001
+VS - 0.3 +VS - 0.19 2.2 8.5 25 12 1.5 0.062 190 220 2.7 1 0.0001
SR RREFIN IREFIN AVREF
Slew Rate Settling Time to 0.01% Reference Input Resistance Reference Input Current Reference Gain to Output
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LT1789-1/LT1789-10 ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Gain Error (Note 6) CONDITIONS G = 1, VO = 0.3V to (+VS) - 1V VO = 0.3V to (+VS) - 0.5V G = 10 (Note 2) G = 100 (Note 2) Gain Nonlinearity (Note 6) G = 1, VO = 0.3V to (+VS) - 1V
l l l l
The l denotes the specifications which apply over the temperature range of 0C TA 70C. VS = 3V, 0V; VS = 5V, 0V; RL = 20k, VREF = half supply, unless otherwise noted. (Note 4)
LT1789-1 MIN TYP MAX 0.25 0.53 0.55 185 0.30 0.53 MIN LT1789-10 TYP MAX UNITS % % % ppm
LT1789-1, VO = 0.3V to (+VS) - 0.5V LT1789-10, VO = 0.3V to 4.7V, VS = 5V (Note 8) l G = 10 l G = 100 G/T VOST VOSI VOSIH VOSO VOSOH VOSI/T VOSO/T IOS IOS/T IB IB/T VCM CMRR Gain vs Temperature Input Offset Voltage Input Offset Voltage Hysteresis Output Offset Voltage Output Offset Voltage Hysteresis Input Offset Voltage Drift (RTI) Output Offset Voltage Drift Input Offset Current Input Offset Current Drift Input Bias Current Input Bias Current Drift Input Voltage Range Common Mode Rejection Ratio (Note 6) G < 1000 (Notes 2, 3) G = 1000 (Notes 3, 5) G = 1 (LT1789-1), G = 10 (LT1789-10) (Notes 3, 5) (Note 3) (Note 3) (Note 6)
l
90 120 5 50 150 3 50 0.2 1.5 3 45 50 0.2 (+VS) - 1 0.2 50 10 950 100 0.5 4 4.5 3 300 0.3 7 3 5
130 130 50 190 10 3700 900 0.7 20 4.5 45 (+VS) - 1.5
ppm ppm ppm/C V V V V V/C V/C nA pA/C nA pA/C V
Total Input Referred Offset Voltage VOST = VOSI + VOSO/G
l l l l l l l l l l l
1k Source Imbalance (Note 6) LT1789-1, VCM = 0.2V to (+VS) - 1V LT1789-10, VCM = 0.2V to (+VS) - 1.5V l G=1 l G = 10 l G = 100, 1000 VS = 2.5V to 12.5V, VCM = VREF = 1V G=1 G = 10 G = 100, 1000 (Note 7) (Note 7) (Note 7)
l l l l l l
77 94 98 88 98 100 2.5 115 110
85 96
dB dB dB dB dB dB 2.5 115 120 V A mV V
PSRR
Power Supply Rejection Ratio
92 100
Minimum Supply Voltage IS VOL VOH Supply Current Output Voltage Swing LOW Output Voltage Swing HIGH
l +VS - 0.38
+VS - 0.38
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LT1789-1/LT1789-10 ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Gain Error (Note 6) CONDITIONS G = 1, VO = 0.3V to (+VS) - 1V VO = 0.3V to (+VS) - 0.5V G = 10 (Note 2) G = 100 (Note 2) Gain Nonlinearity (Note 6) G = 1, VO = 0.3V to (+VS) - 1V
l l l l
The l denotes the specifications which apply over the temperature range of -40C TA 85C. VS = 3V, 0V; VS = 5V, 0V; RL = 20k, VREF = half supply, unless otherwise noted. (Note 4)
LT1789-1 MIN TYP MAX 0.30 0.57 0.59 250 0.35 0.62 MIN LT1789-10 TYP MAX UNITS % % % ppm
LT1789-1, VO = 0.3V to (+VS) - 0.5V LT1789-10, VO = 0.3V to 4.7V, VS = 5V (Note 8) l G = 10 l G = 100 G/T VOST VOSI VOSIH VOSO VOSOH VOSI/T VOSO/T IOS IOS/T IB IB/T VCM CMRR Gain vs Temperature Input Offset Voltage Input Offset Voltage Hysteresis Output Offset Voltage Output Offset Voltage Hysteresis Input Offset Voltage Drift (RTI) Output Offset Voltage Drift Input Offset Current Input Offset Current Drift Input Bias Current Input Bias Current Drift Input Voltage Range Common Mode Rejection Ratio (Note 6) G < 1000 (Notes 2, 3) G = 1000 (Notes 3, 5) G = 1 (LT1789-1), G = 10 (LT1789-10) (Notes 3, 5) (Note 3) (Note 3) (Note 6)
l
105 160 5 50 175 3 50 0.2 1.5 3 50 50 0.2 +VS - 1 0.2 50 10 1050 100 0.5 4 5 3 300 0.3 7 3 5
150 170 50 205 10 4000 900 0.7 20 5 50 +VS - 1.5
ppm ppm ppm/C V V V V V/C V/C nA pA/C nA pA/C V
Total Input Referred Offset Voltage VOST = VOSI + VOSO/G
l l l l l l l l l l l
1k Source Imbalance (Note 6) LT1789-1, VCM = 0.2V to (+VS) - 1V LT1789-10, VCM = 0.2V to (+VS) - 1.5V l G=1 l G = 10 l G = 100, 1000 VS = 2.5V to 12.5V, VCM = VREF = 1V G=1 G = 10 G = 100, 1000 (Note 7) (Note 7) (Note 7)
l l l l l l
75 92 96 86 96 98 2.5 125 120
84 94
dB dB dB dB dB dB 2.5 125 130 V A mV V
PSRR
Power Supply Rejection Ratio
90 98
Minimum Supply Voltage IS VOL VOH Supply Current Output Voltage Swing LOW Output Voltage Swing HIGH
l +VS - 0.40
+VS - 0.40
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LT1789-1/LT1789-10 ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER G Gain Range CONDITIONS
VS = 15V, RL = 20k, VCM = VOUT = 0V, TA = 25C, unless otherwise noted.
LT1789-1 MIN 1 TYP MAX 1000 10 0.01 0.04 0.04 0.07 8 1 6 20 30 0.2 0.2 17 fO = 0.1Hz to 10Hz G=1 G = 10 G = 100, 1000 fO = 1kHz fO = 0.1Hz to 10Hz fO = 1kHz 2 Differential Common Mode -15 1k Source Imbalance, VCM = -15V to 14V G=1 G = 10 G = 100, 1000 LT1789-1 VS = 1.25V to 16V LT1789-10 VS = 1.50V to 16V G=1 G = 10 G = 100, 1000 80 98 102 94 104 102 89 108 117 107 118 121 1.25 85 14.5 Short to -VS Short to +VS 14.7 2.2 8.5 130 14.5 85 14.7 2.2 8.5 5.0 1.5 1.0 49 330 19 62 4.7 20 17 -14 -15 2 90 0.10 0.15 0.15 0.20 20 10 20 100 235 1 4 40 1000 % % % % ppm ppm ppm ppm V mV nA nA VP-P VP-P VP-P 95 nV/Hz nV/Hz pAP-P fA/Hz G pF pF V dB dB dB dB dB dB 1.50 130 V A V mA mA MIN LT1789-1, G = 1 + (200k/RG) LT1789-10, G = 10 * [1+ (200k/RG)] Gain Error VO = 10V G=1 G = 10 (Note 2) G = 100 (Note 2) G = 1000 (Note 2) Gain Nonlinearity VO = 10V G=1 G = 10 G = 100 G = 1000 Total Input Referred Offset Voltage VOST = VOSI + VOSO/G Input Offset Voltage Output Offset Voltage Input Offset Current Input Bias Current Input Noise Voltage, RTI G = 1000 G = 1 (LT1789-1), G =10 (LT1789-10) LT1789-10 TYP MAX UNITS
0.01 0.03 0.03
0.15 0.20 0.25
5 5 25 30 0.6 0.2 17
40 40 160 295 3.3 4 40
VOST VOSI VOSO IOS IB en
4.6 1.1 53 270 19 62 4.7 20 17 -14
Total RTI Noise = eni2 + (eno/G)2 eni eno in RIN CIN VCM CMRR Input Noise Voltage Density, RTI Input Noise Current Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Output Noise Voltage Density, RTI fO = 1kHz
93 102
108 123
PSRR
Power Supply Rejection Ratio
100 106
115 123
Minimum Supply Voltage IS VO ISC Supply Current Output Voltage Swing Short-Circuit Current
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LT1789-1/LT1789-10 ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER BW Bandwidth CONDITIONS G=1 G = 10 G = 100 G = 1000 VOUT = 10V 10V Step VREF = 0V
VS = 15V, RL = 20k, VCM = VOUT = 0V, TA = 25C, unless otherwise noted.
LT1789-1 MIN TYP 60 30 3 0.2 0.012 0.026 460 220 2.7 1 0.0001 0.028 MAX MIN LT1789-10 TYP 25 12 1.5 0.066 270 220 2.7 1 0.0001 MAX UNITS kHz kHz kHz kHz V/s s k A
SR RREFIN IREFIN AVREF
Slew Rate Settling Time to 0.01% Reference Input Resistance Reference Input Current Reference Gain to Output
The l denotes the specifications which apply over the temperature range of 0C TA 70C. VS = 15V, RL = 20k, VCM = VREF = 0V, unless otherwise noted. (Note 4)
LT1789-1 SYMBOL PARAMETER Gain Error CONDITIONS VO = 10V G=1 G = 10 (Note 2) G = 100 (Note 2) G = 1000 (Note 2) VO = 10V G=1 G = 10 G = 100 G = 1000 G < 1000 (Notes 2, 3) G = 1000 (Notes 3, 5) G=1 (Notes 3, 5) (Note 3) (Note 3)
l l l l l l l l l l l l l l l l l l l
LT1789-10 MAX 0.15 0.38 0.38 0.43 25 15 25 120 MIN TYP MAX UNITS % % % % ppm ppm ppm ppm ppm/C V V mV V V/C V/C nA pA/C 45 35 14 -14.8 14 nA pA/C V
MIN
TYP
0.20 0.43 0.48
Gain Nonlinearity
45 45 180 5 50 325 8 400 0.3 8 2 30 4 1000 0.8 22 4.5
G/T VOST VOSI VOSIH VOSO VOSOH VOSI/T VOSO/T IOS IOS/T IB IB/T VCM CMRR
Gain vs Temperature Input Offset Voltage Input Offset Voltage Hysteresis Output Offset Voltage Output Offset Voltage Hysteresis Input Offset Voltage Drift (RTI) Output Offset Voltage Drift Input Offset Current Input Offset Current Drift Input Bias Current Input Bias Current Drift Input Voltage Range Common Mode Rejection Ratio
5
50 285
Total Input Referred Offset Voltage VOST = VOSI + VOSO/G 8 50 0.2 1.5 2 45 35 -14.8 30 1.2 120 0.7 5 4.5
G = 1, Other Input Grounded 1k Source Imbalance, VCM = -14.8V to 14V G=1 G = 10 G = 100, 1000
l
l l l
78 96 100
91 100
dB dB dB
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LT1789-1/LT1789-10 ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER PSRR Power Supply Rejection Ratio CONDITIONS LT1789-1, VS = 1.25V to 16V LT1789-10, VS = 1.50V to 16V G=1 G = 10 G = 100, 1000
The l denotes the specifications which apply over the temperature range of 0C TA 70C. VS = 15V, RL = 20k, VCM = VREF = 0V, unless otherwise noted. (Note 4)
LT1789-1 MIN TYP MAX MIN LT1789-10 TYP MAX UNITS
l l l l l l
92 102 104 1.25 150 14.25 0.010
98 104 1.50 150 14.25 0.026
dB dB dB V A V V/s
Minimum Supply Voltage IS VO SR Supply Current Output Voltage Swing Slew Rate VOUT = 10V
l
The l denotes the specifications which apply over the temperature range of -40C TA 85C. VS = 15V, RL = 20k, VCM = VREF = 0V, unless otherwise noted. (Note 4)
LT1789-1 SYMBOL PARAMETER Gain Error CONDITIONS VO = 10V G=1 G = 10 (Note 2) G = 100 (Note 2) G = 1000 (Note 2) VO = 10V G=1 G = 10 G = 100 G = 1000 G < 1000 (Notes 2, 3) G = 1000 (Notes 3, 5) G=1 (Notes 3, 5) (Note 3) (Note 3)
l l l l l l l l l l l l l l l l l l l
LT1789-10 MAX 0.20 0.57 0.57 0.62 30 20 30 130 MIN TYP MAX UNITS % % % % ppm ppm ppm ppm ppm/C V V mV V V/C V/C nA pA/C 50 35 14 -14.8 14 nA pA/C V
MIN
TYP
0.25 0.62 0.67
Gain Nonlinearity
50 50 200 5 50 340 8 400 0.3 8 2 30 4.2 1000 0.8 22 5
G/T VOST VOSI VOSIH VOSO VOSOH VOSI/T VOSO/T IOS IOS/T IB IB/T VCM CMRR
Gain vs Temperature Input Offset Voltage Input Offset Voltage Hysteresis Output Offset Voltage Output Offset Voltage Hysteresis Input Offset Voltage Drift (RTI) Output Offset Voltage Drift Input Offset Current Input Offset Current Drift Input Bias Current Input Bias Current Drift Input Voltage Range Common Mode Rejection Ratio
5
50 305
Total Input Referred Offset Voltage VOST = VOSI + VOSO/G 8 50 0.2 1.5 2 50 35 -14.8 30 1.3 120 0.7 5 5
G = 1, Other Input Grounded 1k Source Imbalance, VCM = -14.8V to 14V G=1 G = 10 G = 100, 1000
l
l l l
76 94 98
89 98
dB dB dB
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LT1789-1/LT1789-10 ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER PSRR Power Supply Rejection Ratio CONDITIONS LT1789-1, VS = 1.25V to 16V LT1789-10, VS = 1.50V to 16V G=1 G = 10 G = 100, 1000
The l denotes the specifications which apply over the temperature range of -40C TA 85C. VS = 15V, RL = 20k, VCM = VREF = 0V, unless otherwise noted. (Note 4)
LT1789-1 MIN TYP MAX MIN LT1789-10 TYP MAX UNITS
l l l l l l
90 100 102 1.25 160 14.15 0.008
96 102 1.50 160 14.15 0.024
dB dB dB V A V V/s
Minimum Supply Voltage IS VO SR Supply Current Output Voltage Swing Slew Rate VOUT = 10V
l
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Does not include the effect of the external gain resistor RG. Note 3: This parameter is not 100% tested. Note 4: The LT1789C-1/ LT1789C-10 is guaranteed to meet specified performance from 0C to 70C and is designed, characterized and expected to meet these extended temperature limits, but is not tested at -40C and 85C. The LT1789I-1/ LT1789I-10 is guaranteed to meet the extended temperature limits.
Note 5: Hysteresis in offset voltage is created by package stress that differs depending on whether the IC was previously at a higher or lower temperature. Offset voltage hysteresis is always measured at 25C, but the IC is cycled to 85C I-grade (or 70C C-grade) or - 40C I-grade (0C C-grade) before successive measurement. 60% of the parts will pass the typical limit on the data sheet. Note 6: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = 15V tests. Note 7: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = 15V tests. Note 8: This parameter is not tested at VS = 3V on the LT1789-10 due to an increase in sensitivity to test system noise. Actual performance is expected to be similar to performance at VS = 5V.
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
120 110 SUPPLY CURRENT (A) 125C INPUT BIAS CURRENT (nA) 100 90 80 70 60 50 40 30 20 0 5 10 15 20 25 30 35 TOTAL SUPPLY VOLTAGE (V) 40 -25 -50 -25 50 25 0 75 TEMPERATURE (C) 25C -55C -5 0
(LT1789-1, LT1789-10) Input Bias Current vs Common Mode Input Voltage
-10 -12 INPUT BIAS CURRENT (nA) -14 -16 -18 -20 -22 -24 -26 -28 100 125 VS = 5V, 0V VREF = 2.5V 125C 25C 85C -55C
Input Bias Current vs Temperature
VS = 5V, 0V VCM = 2.5V
-10
-15
-20
-30 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 COMMON MODE INPUT VOLTAGE (V)
1789 G03
1789 G01
1789 G02
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LT1789-1/LT1789-10 TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage Swing vs Load Current
5.0 OUTPUT VOLTAGE SWING--SOURCING (V) 4.8 4.6 4.4 4.2 4.0 VS = 5V, 0V VREF = 2.5V 125C 25C 125C SOURCE 25C 1.6 1.4 1.2 1.0 0.8 0.6 0.4 SINK -55C 0.2 0 0.001 0.01 0.1 1 OUTPUT CURRENT (mA) 10
1789 G04
(LT1789-1)
Gain vs Frequency
-55C 80 OUTPUT VOLTAGE SWING--SINKING (V) 70 60 50 GAIN (dB) 40 30 20 10 0 -10 -20 100 1k 10k FREQUENCY (Hz) 100k
1789 G05
Slew Rate vs Temperature
VS = 5V, 0V VREF = 2.5V 0.050 VS = 5V, 0V 0.045 VREF = 2.5V G=1 0.040 RL = 20k
G = 1000
G = 100
SLEW RATE (V/s)
0.035 RISING 0.030 0.025 0.020 0.015 0.010 -50 -25 0 75 50 25 TEMPERATURE (C) 100 125 FALLING
G = 10
G=1
1789 G06
NEGATIVE POWER SUPPLY REJECTION RATIO (dB)
120 COMMON MODE REJECTION RATIO (dB) 110 100 90 80 70 60 50 40 10 1k 100 FREQUENCY (Hz) G = 10
VS = 5V, 0V VREF = 2.5V
140 120 100 80 60 40 20 0 10 G=1 G = 100 G = 10 G = 1000
POSITIVE POWER SUPPLY REJECTION RATIO (dB)
Common Mode Rejection Ratio vs Frequency
Negative Power Supply Rejection Ratio vs Frequency
VS = 5V, 0V VREF = 2.5V INPUT REFERRED
Positive Power Supply Rejection Ratio vs Frequency
140 120 100 80 60 40 20 0 10 100 1k FREQUENCY (Hz) 10k 20k
1789 G09
G = 100, 1000 G = 10 G=1
VS = 5V, 0V VREF = 2.5V INPUT REFERRED
G = 100, 1000 G=1
10k 20k
1879 G07
100 1k FREQUENCY (Hz)
10k 20k
1789 G08
Output Impedance vs Frequency
10k VS = 5V, 0V VREF = 2.5V 100 90 80 OVERSHOOT (%) 70 60 50 40 30 20 10 1 100 0 1k 10k FREQUENCY (Hz) 100k
1789 G10
Overshoot vs Capacitive Load
VS = 5V, 0V VREF = 2.5V VOUT = 100mVP-P OUTPUT STEP (V) 10 8 6 4 2 0 -2 -4 -6 -8 -10 1000
1789 G11
Settling Time to 0.01% vs Output Step
VS = 15V RL = 20k G=1
OUTPUT IMPEDANCE ()
1k
100
10
AV = 1 AV = 10 AV 100 1 10 100 CAPACITIVE LOAD (pF)
0
100
300 400 200 SETTLING TIME (s)
500
1789 G12
1789fc
10
LT1789-1/LT1789-10 TYPICAL PERFORMANCE CHARACTERISTICS
Voltage Noise Density vs Frequency
1000 VOLTAGE NOISE DENSITY (nV/Hz) CURRENT NOISE DENSITY (fA/Hz) VS = 5V, 0V VREF = 2.5V INPUT REFERRED G=1 1000
(LT1789-1)
Current Noise Density vs Frequency
VS = 5V, 0V VREF = 2.5V
100
G = 10
100 RS LT1789-1
G = 100, 1000
10 1 10 100 FREQUENCY (Hz) 1k
1789 G13
10 1 10 100 FREQUENCY (Hz) 1k
1789 G14
0.1Hz to 10Hz Noise Voltage, G=1
VS = 5V, 0V VREF = 2.5V NOISE VOLTAGE (0.5V/DIV) NOISE VOLTAGE (2V/DIV)
0.1Hz to 10Hz Noise Voltage, RTI, G = 1000
VS = 5V, 0V VREF = 2.5V
0
1
2
3
456 TIME (SEC)
7
8
9 10
1789 G15
0
1
2
3
456 TIME (SEC)
7
8
9 10
1789 G16
0.1Hz to 10Hz Noise Current
CHANGE IN OUTPUT VOLTAGE (V) VS = 5V, 0V VREF = 2.5V NOISE CURRENT (5pA/DIV) 1.5
Turn-On Characteristics
VS = 5V, 0V VREF = 2.5V VCM = 2.5V G = 1000 TA = 25C
0.5
-0.5
-1.5 0 1 2 3 456 TIME (SEC) 7 8 9 10
1789 G17
0
10
20 TIME (ms)
30
40
1789 G18
1789fc
11
LT1789-1/LT1789-10 TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage Swing vs Load Current
5.0 OUTPUT VOLTAGE SWING--SOURCING (V) 4.8 4.6 4.4 4.2 4.0 VS = 5V, 0V VREF = 2.5V 125C 25C 125C SOURCE 25C 1.6 1.4 1.2 1.0 0.8 0.6 0.4 SINK -55C 0.2 0 0.001 0.01 0.1 1 OUTPUT CURRENT (mA) 10
1789 G21
(LT1789-10)
Gain vs Frequency
-55C 80 OUTPUT VOLTAGE SWING--SINKING (V) 70 60 50 GAIN (dB) 40 30 20 10 0 -10 -20 100 1k 10k FREQUENCY (Hz) 100k
1789 G22
Slew Rate vs Temperature
VS = 5V, 0V VREF = 2.5V 0.12 0.11 0.10 RISING
G = 1000
G = 100
SLEW RATE (V/s)
0.09 0.08 0.07 0.06 0.05 0.04 -50 -25 0 25 50 75 100 125 FALLING
G = 10
TEMPERATURE (C)
1789 G23
NEGATIVE POWER SUPPLY REJECTION RATIO (dB)
120 COMMON MODE REJECTION RATIO (dB) G = 100, 1000 110 100 90 80 70 60 50 40 10 100 1k FREQUENCY (Hz) G = 10
VS = 5V, 0V VREF = 2.5V
140 120 100 80 G = 10 60 40 20 0 G = 1000
POSITIVE POWER SUPPLY REJECTION RATIO (dB)
Common Mode Rejection Ratio vs Frequency
Negative Power Supply Rejection Ratio vs Frequency
VS = 5V, 0V VREF = 2.5V INPUT REFERRED
Positive Power Supply Rejection Ratio vs Frequency
140 120 100 80 60 40 20 0 10 100 1k FREQUENCY (Hz) 10k 20k
1789 G26
G = 100, 1000 G = 10
VS = 5V, 0V VREF = 2.5V INPUT REFERRED
G = 100
10k 20k
1789 G24
10
100 1k FREQUENCY (Hz)
10k 20k
1789 G25
Output Impedance vs Frequency
10k VS = 5V, 0V VREF = 2.5V 100 90 80 OVERSHOOT (%) 70 60 50 40 30 20 10 1 100 1k 10k FREQUENCY (Hz) 100k
1789 G27
Overshoot vs Capacitive Load
VS = 5V, 0V VREF = 2.5V VOUT = 100mVP-P OUTPUT STEP (V) 10 8 6 4 2 0 -2 -4 -6 -8 1000
1789 G28
Settling Time to 0.01% vs Output Step
VS = 15V RL = 20k G = 10
OUTPUT IMPEDANCE ()
1k
100
10
G = 1000 G = 100 G = 10 100 CAPACITIVE LOAD (pF)
0 10
-10
0
100
300 400 200 SETTLING TIME (s)
500
1789 G29
1789fc
12
LT1789-1/LT1789-10 TYPICAL PERFORMANCE CHARACTERISTICS
Voltage Noise Density vs Frequency
1000 VOLTAGE NOISE DENSITY (nV/Hz) CURRENT NOISE DENSITY (fA/Hz) VS = 5V, 0V VREF = 2.5V INPUT REFERRED G = 10 100 1000
(LT1789-10)
Current Noise Density vs Frequency
VS = 5V, 0V VREF = 2.5V
G = 100 G = 1000
100 RS LT1789-10
10 1 10 100 FREQUENCY (Hz) 1k
1789 G30
10 1 10 100 FREQUENCY (Hz) 1k
1789 G31
0.1Hz to 10Hz Noise Voltage, RTI, G = 10
VS = 5V, 0V VREF = 2.5V NOISE VOLTAGE (0.5V/DIV) 1 3 NOISE VOLTAGE (2V/DIV)
0.1Hz to 10Hz Noise Voltage, RTI, G = 1000
VS = 5V, 0V VREF = 2.5V
0
2
456 TIME (SEC)
7
8
9 10
1789 G32
0
1
2
3
456 TIME (SEC)
7
8
9 10
1789 G33
0.1Hz to 10Hz Noise Current
CHANGE IN OUTPUT VOLTAGE (V) VS = 5V, 0V VREF = 2.5V NOISE CURRENT (5pA/DIV) 1.5
Turn-On Characteristics
VS = 5V, 0V VREF = 2.5V VCM = 2.5V G = 1000 TA = 25C
0.5
-0.5
-1.5 0 1 2 3 456 TIME (SEC) 7 8 9 10
1789 G34
0
10
20 TIME (ms)
30
40
1789 G59
1789fc
13
LT1789-1/LT1789-10 TYPICAL PERFORMANCE CHARACTERISTICS
Large-Signal Transient Response G = 1, 10, 100 (LT1789-1)
Large-Signal Transient Response G = 1000
5V/DIV
5V/DIV
VS = 15V RL = 20k CL = 50pF
500s/DIV
1789 G38
VS = 15V RL = 20k CL = 50pF
2ms/DIV
1789 G39
Small-Signal Transient Response G=1
Small-Signal Transient Response G = 10
20mV/DIV
20mV/DIV
VS = 5V, 0V VREF = 2.5V RL = 20k CL = 50pF
100s/DIV
1789 G40
VS = 5V, 0V VREF = 2.5V RL = 20k CL = 50pF
100s/DIV
1789 G41
Small-Signal Transient Response G = 100
Small-Signal Transient Response G = 1000
20mV/DIV
20mV/DIV
VS = 5V, 0V VREF = 2.5V RL = 20k CL = 50pF
200s/DIV
1789 G42
VS = 5V, 0V VREF = 2.5V RL = 20k CL = 50pF
2ms/DIV
1789 G43
1789fc
14
LT1789-1/LT1789-10 TYPICAL PERFORMANCE CHARACTERISTICS
Large-Signal Transient Response G = 10, 100 (LT1789-10) Small-Signal Transient Response G = 10
Large-Signal Transient Response G = 1000
5V/DIV
5V/DIV
20mV/DIV
VS = 15V RL = 20k CL = 50pF
500s/DIV
1789 G44
VS = 15V RL = 20k CL = 50pF
500s/DIV
1789 G45
VS = 5V, 0V VREF = 2.5V RL = 20k CL = 50pF
100s/DIV
1789 G46
Small-Signal Transient Response G = 100
Small-Signal Transient Response G = 1000
20mV/DIV
20mV/DIV
VS = 5V, 0V VREF = 2.5V RL = 20k CL = 50pF
200s/DIV
1789 G47
VS = 5V, 0V VREF = 2.5V RL = 20k CL = 50pF
2ms/DIV
1789 G48
1789fc
15
LT1789-1/LT1789-10 TYPICAL PERFORMANCE CHARACTERISTICS
Valid Output Voltage vs Input Common Mode Voltage VS = 15V
15 G2 VALID OUTPUT VOLTAGE (V) 10 5 0 -5 -10 -15 -15 G=1 TA = 25C VALID OUTPUT VOLTAGE (V) 3.0 2.5 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 10 -5 0 5 -10 INPUT COMMON MODE VOLTAGE (V) 15V 15 -2.5 -2.5 -1.5 1.5 -0.5 0.5 INPUT COMMON MODE VOLTAGE (V) 2.5V 2.5 -1.5 -1.5 0 0.5 1.0 -1.0 -0.5 INPUT COMMON MODE VOLTAGE (V) 1.5V 1.5 AV = 10 AV = 1 AV = 2
(LT1789-1) Valid Output Voltage vs Input Common Mode Voltage VS = 1.5V
1.5 1.0 0.5 0 -0.5 -1.0 AV = 1 AV = 2 AV = 10 TA = 25C
Valid Output Voltage vs Input Common Mode Voltage VS = 2.5V
TA = 25C VALID OUTPUT VOLTAGE (V)
+
VD/2 VD/2
V+ VOUT REF 20K VCM
+
VD/2 VD/2
V+ VOUT REF 20K VCM
+
VD/2 VD/2
V+ VOUT REF 20K
LT1789-1 VCM
LT1789-1
LT1789-1
-
V-
-
V-
-
V-
-15V
1789 G49
-2.5V
1789 G50
-1.5V
1789 G51
Valid Output Voltage vs Input Common Mode Voltage VS = 5V
5 TA = 25C VALID OUTPUT VOLTAGE (V) 3
Valid Output Voltage vs Input Common Mode Voltage VS = 3V
TA = 25C
VALID OUTPUT VOLTAGE (V)
4
2
3 G=1 2 G=2 1 G = 10
G=1 1 G=2 G = 10 0
0 0 1 3 4 2 INPUT COMMON MODE VOLTAGE (V) 5V 5
0
2.0 0.5 1.5 2.5 1.0 INPUT COMMON MODE VOLTAGE (V) 3V
3.0
+
VD/2 VD/2
V+ VOUT REF 20K VCM
+
VD/2 VD/2
V+ VOUT REF 20K
LT1789-1 VCM
LT1789-1
-
V-
-
V-
1789 G52
1789 G53
1789fc
16
LT1789-1/LT1789-10 TYPICAL PERFORMANCE CHARACTERISTICS
Valid Output Voltage vs Input Common Mode Voltage VS = 15V
15 G = 10 VALID OUTPUT VOLTAGE (V) 10 5 0 -5 -10 -15 -15 G = 100 TA = 25C VALID OUTPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 10 -5 0 5 -10 INPUT COMMON MODE VOLTAGE (V) 15V 15 -2.5 -2.5 -1.5 1.5 -0.5 0 0.5 INPUT COMMON MODE VOLTAGE (V) 2.5V 2.5 -1.5 -1.5 0 0.5 1.0 -1.0 -0.5 INPUT COMMON MODE VOLTAGE (V) 1.5V 1.5 AV = 10 AV = 100
(LT1789-10) Valid Output Voltage vs Input Common Mode Voltage VS = 1.5V
1.5 1.0 0.5 0 -0.5 -1.0 AV = 10 AV = 100 TA = 25C
Valid Output Voltage vs Input Common Mode Voltage VS = 2.5V
TA = 25C VALID OUTPUT VOLTAGE (V)
+
VD/2 VD/2
V+ VOUT REF 20K VCM
+
VD/2 VD/2
V+ VOUT REF 20K VCM
+
VD/2 VD/2
V+ VOUT REF 20K
LT1789-10 VCM
LT1789-10
LT1789-10
-
V-
-
V-
-
V-
-15V
1789 G54
-2.5V
1789 G55
-1.5V
1789 G56
Valid Output Voltage vs Input Common Mode Voltage VS = 5V
5 G = 10 VALID OUTPUT VOLTAGE (V) 4 G = 100 3 TA = 25C VALID OUTPUT VOLTAGE (V) 3
Valid Output Voltage vs Input Common Mode Voltage VS = 3V
TA = 25C G = 10 G = 100 2
2
1
1
0 0 1 3 4 2 INPUT COMMON MODE VOLTAGE (V) 5V 5
0
0
2.0 0.5 1.5 2.5 1.0 INPUT COMMON MODE VOLTAGE (V) 3V
3.0
+
VD/2 VD/2
V+ VOUT REF 20K VCM
+
VD/2 VD/2
V+ VOUT REF 20K
LT1789-10 VCM
LT1789-10
-
V-
-
V-
1789 G57
1789 G58
1789fc
17
LT1789-1/LT1789-10 BLOCK DIAGRAM
V+ V+ 100k 5.7k +IN 3 RG 1 V- V- VB V+ RG 8 5.7k -IN 2 V+ 100k V+
V-
V- VB
Figure 1. Block Diagram
APPLICATIONS INFORMATION
Setting the Gain The gain of the LT1789-1 and LT1789-10 is set by the value of resistor RG, applied across pins 1 and 8. For the LT1789-1, the gain G will be: G = 1+ 200k/RG and RG can be calculated from the desired gain by RG = 200k/(G - 1) For the LT1789-10, the gain G will be G =10 * (1 + 200k/RG) and RG can be calculated from the desired gain by RG = 200k/(0.1 * G - 1) For the lowest achievable gain, RG may be set to infinity by leaving Pins 1 and 8 open. Input and Output Offset Voltage The offset voltage of the LT1789-1/LT1789-10 has two components: the output offset and the input offset. The total offset voltage referred to the input (RTI) is found by dividing the output offset by the programmed gain (G) and adding it to the input offset. At high gains the input offset voltage dominates, whereas at low gains the output offset voltage dominates. The total offset voltage is: To t a l i n p u t o f f s e t v o l t a g e = input offset + (output offset/G) To t a l o u t p u t o f f s e t v o l t a g e = (input offset * G) + output offset (RTI) (RTO)
18
+ +
A3 V-
+
-
A1
R1 R2 110k/10k* 110k/100k* 5 REF
-
R3 R4 110k/10k* 110k/100k* A2
V+
-
6 OUT 7 V+ *LT1789-1/LT1789-10 V- 4 V-
1789 F01
1789fc
LT1789-1/LT1789-10 APPLICATIONS INFORMATION
Reference Terminal The output voltage of the LT1789-1/LT1789-10 (Pin 6) is referenced to the voltage on the reference terminal (Pin 5). Resistance in series with the REF pin must be minimized for best common mode rejection. For example, a 22 resistance from the REF pin to ground will not only increase the gain error by 0.02% but will lower the CMRR to 80dB. Output Offset Trimming The LT1789-1/LT1789-10 is laser trimmed for low offset voltage so that no external offset trimming is required for most applications. In the event that the offset needs to be adjusted, the circuit in Figure 2 is an example of an optional offset adjust circuit. The op amp buffer provides a low impedance to the REF pin where resistance must be kept to a minimum for best CMRR and lowest gain error. Input Bias Current Return Path The low input bias current of the LT1789-1/LT1789-10 (19nA) and the high input impedance (1.6G) allow the use of high impedance sources without introducing significant offset voltage errors, even when the full common mode range is required. However, a path must be provided for the input bias currents of both inputs when a purely differential signal is being amplified. Without this path the inputs will float high and exceed the input common mode range of the LT1789-1/LT1789-10, resulting in a saturated input stage. Figure 3 shows three examples of an input bias current path. The first example is of a purely differential signal source with a 10k input current path to ground. Since the impedance of the signal source is low, only one resistor is needed. Two matching resistors are needed for higher impedance signal sources as shown in the second example. Balancing the input impedance improves both common mode rejection and DC offset. The need for input resistors is eliminated if a center tap is present as shown in the third example.
V+
-IN RG
1
LT1880 3
Figure 2. Optional Trimming of Output Offset Voltage
THERMOCOUPLE
RG
LT1789-1/ LT1789-10
MICROPHONE, HYDROPHONE, ETC
RG
LT1789-1/ LT1789-10
RG
10k
200k
200k CENTER-TAP PROVIDES BIAS CURRENT RETURN
1789 F03
Figure 3. Providing an Input Common Mode Current Path
1789fc
-
+
+
10mV ADJUSTMENT RANGE
-
1 LT1789-1/-10 8 REF 3 +IN 5
-
+
+
-
2
OUTPUT 6 2 100 10k 100
10mV
-10mV
V-
1789 F02
- +
LT1789-1/ LT1789-10
19
LT1789-1/LT1789-10 APPLICATIONS INFORMATION
Output Voltage vs Input Common Mode Voltage All instrumentation amplifiers have limiting factors that can cause an output to be invalid (the output is not equal to the input differential voltage multiplied by the gain) even though the output appears to be operating in a linear region. Limiting factors such as input voltage range and output swing can be easily measured, however, there are also internal nodes that can limit. These internal nodes cannot be measured externally and can lead to erroneous output readings. To ensure a valid output for a given input common mode voltage and input differential voltage, the following four limiting factors must be taken into consideration (refer to the block diagram): 1) The input voltage ranges of the input amplifiers A1 and A2. 2) The output swings of the input amplifiers A1 and A2 (internal nodes). 3) The input voltage range of the output amplifier A3 (internal node). 4) The output swing of the output amplifier A3. These limits can be determined using the relationships below. 1) The input voltage range limits can be found in the electrical tables. 2) The output voltages of the input amplifiers A1 and A2 can be found by the following formulas: VOUT A1 = (VD/2)(G)(R1/R2) + VCM + 0.6V VOUT A2 = (-VD/2)(G)(R1/R2) + VCM + 0.6V Where VD is the input differential voltage and VCM is the input common mode voltage. The typical output swing limits for A1 and A2 can be found in the Output Swing vs Load Current typical performance curve, using R1 + R2 as the load resistance. This limitation usually becomes dominant when gain is taken in the input stage and the common mode input voltage is close to either supply rail.
1789fc
The LT1789-10 is less susceptible to this limiting factor because the gain is taken in the output stage. 3) The voltage on the inputs to the output amplifier A3 can be determined by the following formula: VIN A3 = (VOUT A1 - VREF)(R2/(R1 + R2)) The input voltage range of A3 has the same input limits as the LT1789-1. This limiting factor is more prevalent with single supplies, where both the reference voltage and input common mode voltage are near V+. This is also more of a concern with the LT1789-10 because the ratio of R1:R2 is 1:10 instead of 1:1. 4) The output voltage swing limits are also found in the electrical tables. The Output Voltage vs Input Common Mode Voltage typical performance curves show the regions of operation for the three supply voltages specified. Single Supply Operation There are usually two types of input signals that need to be processed; differential signals, like the output of a bridge or single ended signals, such as the output from a thermistor. Both signals require special consideration when operating with a single supply. When processing differential signals , REF (Pin 5) must be brought above the negative supply (Pin 4) to allow the output to process both the positive and negative going input signal. The maximum output operating range is obtained by setting the voltage on the REF pin to half supply. This must be done with a low impedance source to minimize CMRR and gain errors. For single ended input signals, the REF pin can be at the same potential as the negative supply provided the output of the instrumentation amplifier remains inside the specified operating range. This maximizes the output range, however the smallest input signal that can be processed is limited by the output swing to the negative supply.
20
LT1789-1/LT1789-10 TYPICAL APPLICATIONS
Single Supply Positive Integrator
VIN 3 8 1 2 LT1789-1 REF VS
+
7
R1 6 10k 5
VS 3
+
LT1636 1 VOUT
+
-
4
C1 100F RESET
R2 10
2
-
4
1789 TA02
VS = 2.7V TO 32V TIME CONSTANT = (R1)(C1) = 1 SECOND AS SHOWN
Avalanche Photo Diode Module Bias Current Monitor
FOR OPTIONAL "ZERO CURRENT" FEEDBACK TO APD BIAS REGULATOR, SEE APPENDIX A, APPLICATION NOTE 92 VOUT = 20V TO 90V TO APD
APD HIGH VOLTAGE BIAS INPUT
1k* 1% 1F 100V 100k* Q1 100k* 1F 100V
1N4690 5.6V
1M* 0.2F
5V
5V 1F 6 20k 2 S2 5 1F
-
10k 30k Q2 MPSA42 20k 12 13 S1 5V 14 0.2F A1 LT1789-1
+
A2 LT1006
+
1M* -3.5V
-
20k* -3.5V 200k*
OUTPUT 0V TO 1V = 0mA TO 1mA
18 5V S3 3 15
22F
-3.5V TO AMPLIFIERS
= 1N4148 = TP0610L 16 0.056F
FOR MORE INFORMATION REFER TO APPLICATION NOTE 92
17
4
5V
1789 TA05
+
* = 0.1% METAL FILM RESISTOR 1F 100V = TECATE CMC100105MX1825 # CIRCLED NUMBERS = LTC1043 PIN NUMBER
+
22F
1789fc
21
LT1789-1/LT1789-10 PACKAGE DESCRIPTION
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 - .197 (4.801 - 5.004) NOTE 3 8 7 6 5
.050 BSC
.045 .005
.245 MIN
.160 .005
.228 - .244 (5.791 - 6.197)
.150 - .157 (3.810 - 3.988) NOTE 3
.030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT
.010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254) .016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN 0- 8 TYP
1
2
3
4
.053 - .069 (1.346 - 1.752)
.004 - .010 (0.101 - 0.254)
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
.014 - .019 (0.355 - 0.483) TYP
.050 (1.270) BSC
SO8 0303
1789fc
22
LT1789-1/LT1789-10 REVISION HISTORY
REV C DATE 5/10 DESCRIPTION Updated Input Noise Current Density Spec
(Revision history begins at Rev C)
PAGE NUMBER 6
1789fc
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
LT1789-1/LT1789-10 TYPICAL APPLICATION
Voltage Controlled Current Source
3V TO 32V VIN 3 8 RG 1 2
+
7 6 R1 1k
LT1789-1 REF 5
-
4 IL LOAD
IL = AV * VIN/R1 AV = 1 + 200k RG
1789 TA03
10C to 40C Thermometer
VS+ 4 LT1790 6 -1.25 12 29.4k 1% 3 8 36.5k 0.5% 1 2 THERMISTOR THERMOMETRICS DC95G104V 100k @ 25C 866k 1% 56.2k 1% LT1789-10 5 VS+
+
7 6 VOUT = 2.5V AT 25C + 50mV/C OVER 10C TO 40C LINEARITY = 0.3C ACCURACY = 1C WORST CASE TOLERANCE STACK-UP VS+ = 4V TO 18V
1789 TA04
-
4
RELATED PARTS
PART NUMBER DESCRIPTION LTC1100 LT1101 LT1102 LT1167 LT1168 LTC(R)1418 LT1460 LT1468 LTC1562 LTC1605 Precision Chopper-Stabilized Instrumentation Amplifier Precision, Micropower, Single Supply Instrumentation Amplifier High Speed, JFET Instrumentation Amplifier COMMENTS Best DC Accuracy Fixed Gain of 10 or 100, IS <105A Fixed Gain of 10 or 100, 30V/s Slew Rate
Single Resistor Gain Programmable, Precision Instrumentation Amplifier Gain Error: 0.08% Max, Gain Nonlinearity: 10ppm Max, 60V Max Input Offset Voltage, 90dB Min CMRR Low Power, Single Resistor Programmable Instrumentation Amplifier 14-Bit, Low Power, 200ksps ADC with Serial and Parallel I/O Precision Series Reference 16-Bit Accurate Op Amp, Low Noise Fast Settling Active RC Filter 16-Bit, 100ksps, Sampling ADC ISUPPLY = 530A Max Single Supply 5V or 5V Operation, 1.5LSB INL and 1LSB DNL Max Micropower; 2.5V, 5V, 10V Versions; High Precision 16-Bit Accuracy at Low and High Frequencies, 90MHz GBW, 22V/s, 900ns Settling Lowpass, Bandpass, Highpass Responses; Low Noise, Low Distortion, Four 2nd Order Filter Sections Single 5V Supply, Bipolar Input Range: 10V, Power Dissipation: 55mW Typ
1789fc
24 Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
LT 0510 REV C * PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2002

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