Datasheet LT1097 (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | Low Cost, Low Power Precision Op |
| Pages / Page | 12 / 9 — APPLICATIONS INFORMATION. 27V Common Mode Range Difference Amplifier. … |
| File Format / Size | PDF / 198 Kb |
| Document Language | English |
APPLICATIONS INFORMATION. 27V Common Mode Range Difference Amplifier. Frequency Compensation and Optional Offset Nulling
Model Line for this Datasheet
Text Version of Document
LT1097
U U W U APPLICATIONS INFORMATION
The LT1097 is pin compatible to and directly replaces such referred performance obtained using the LT1097 and precision op amps as the OP-07, OP-77, AD707, OP-97, OP- other popular, low cost precision op amps. 177, LM607 and LT1001 with improved price/performance. Input offset voltage can be adjusted over a ±600µV range Compatibility includes externally nulling the offset voltage, as with a 10k potentiometer. all of the above devices are trimmed with a potentiometer between Pin 1 and Pin 8 and the wiper tied to V+. The LT1097 is internally compensated for unity gain stability. As shown on the Capacitive Load Handling plot, The simple difference amplifier can be used to illustrate the LT1097 is stable with any capacitive load. However, the all-around excellence of the LT1097. The 50k input the overcompensation capacitor, C resistance is selected to be large enough compared to S, can be used to re- duce overshoot with heavy capacitive loads, to narrow input signal source resistance. Simultaneously, the 50k noise bandwidth or to stabilize circuits with gain in the resistors should not dominate the precision and noise feedback loop. error budget. Assuming perfect matching between the four resistors, the following table summarizes the input ±
27V Common Mode Range Difference Amplifier Frequency Compensation and Optional Offset Nulling
50k V+ 10k POT 15V 1 2 50k 2 7 – 8 –IN – 7 6 6 LT1097 OUT LT1097 OUT 3 5 50k 3 + +IN + C 4 S 4 50k –15V V– LT1097•F02 LT1097•F01
Guaranteed Perfomance, VS =
±
15V, TA = 25
°
C PARAMETER LT1097CN8 OP-77GP AD707JN OP-177GP OP-97FP UNITS
Error Terms VOS Max 50 100 90 60 75 µV IOS Max•25k 6 70 50 70 4 µV Gain Min, 10V Out 14 5 3 5 50 µV CMRR, Min, ±25V In 22 20 13 22 39 µV PSRR, Min, VS = ±15V ±10% 6 9 9 9 9 µV Sum of All Error Terms 98 204 165 166 177 µV 0.1Hz to 10Hz Noise Voltage Noise 0.5 0.38 0.23 0.38 0.5 µVp-p Typ Current Noise•50k 0.11 0.75 0.7 0.75 0.1 µVp-p Typ Resistor Noise 0.55 0.55 0.55 0.55 0.55 µVp-p Typ RMS sum 0.75 1 0.92 1 0.75 µVp-p Drift with Temp TCVOS Max 1 1.2 1 1.2 2 µV/°C TCIOS Max•25k 0.1 2.1 1 2.1 0.2 µV/°C Sum of Drift Terms 1.1 3.3 2 3.3 2.2 µV/°C Supply Current Max 0.56 2 3 2 0.6 mA 9
U U W U APPLICATIONS INFORMATION
The LT1097 is pin compatible to and directly replaces such referred performance obtained using the LT1097 and precision op amps as the OP-07, OP-77, AD707, OP-97, OP- other popular, low cost precision op amps. 177, LM607 and LT1001 with improved price/performance. Input offset voltage can be adjusted over a ±600µV range Compatibility includes externally nulling the offset voltage, as with a 10k potentiometer. all of the above devices are trimmed with a potentiometer between Pin 1 and Pin 8 and the wiper tied to V+. The LT1097 is internally compensated for unity gain stability. As shown on the Capacitive Load Handling plot, The simple difference amplifier can be used to illustrate the LT1097 is stable with any capacitive load. However, the all-around excellence of the LT1097. The 50k input the overcompensation capacitor, C resistance is selected to be large enough compared to S, can be used to re- duce overshoot with heavy capacitive loads, to narrow input signal source resistance. Simultaneously, the 50k noise bandwidth or to stabilize circuits with gain in the resistors should not dominate the precision and noise feedback loop. error budget. Assuming perfect matching between the four resistors, the following table summarizes the input ±
27V Common Mode Range Difference Amplifier Frequency Compensation and Optional Offset Nulling
50k V+ 10k POT 15V 1 2 50k 2 7 – 8 –IN – 7 6 6 LT1097 OUT LT1097 OUT 3 5 50k 3 + +IN + C 4 S 4 50k –15V V– LT1097•F02 LT1097•F01
Guaranteed Perfomance, VS =
±
15V, TA = 25
°
C PARAMETER LT1097CN8 OP-77GP AD707JN OP-177GP OP-97FP UNITS
Error Terms VOS Max 50 100 90 60 75 µV IOS Max•25k 6 70 50 70 4 µV Gain Min, 10V Out 14 5 3 5 50 µV CMRR, Min, ±25V In 22 20 13 22 39 µV PSRR, Min, VS = ±15V ±10% 6 9 9 9 9 µV Sum of All Error Terms 98 204 165 166 177 µV 0.1Hz to 10Hz Noise Voltage Noise 0.5 0.38 0.23 0.38 0.5 µVp-p Typ Current Noise•50k 0.11 0.75 0.7 0.75 0.1 µVp-p Typ Resistor Noise 0.55 0.55 0.55 0.55 0.55 µVp-p Typ RMS sum 0.75 1 0.92 1 0.75 µVp-p Drift with Temp TCVOS Max 1 1.2 1 1.2 2 µV/°C TCIOS Max•25k 0.1 2.1 1 2.1 0.2 µV/°C Sum of Drift Terms 1.1 3.3 2 3.3 2.2 µV/°C Supply Current Max 0.56 2 3 2 0.6 mA 9
