LT1991 - Precision, 100µA Gain Selectable Amplifier
The LT1991 combines a precision operational amplifier with eight precision resistors to form a one-chip solution for accurately amplifying voltages. Gains from -13 to 14 with a gain accuracy of 0.04% can be achieved using no external components. The device is particularly well suited for use as a difference amplifier, where the excellent resistor matching results in a common mode rejection ratio of greater than 75dB.
The amplifier features a 50µV maximum input offset voltage and a gain bandwidth product of 560kHz. The device operates from any supply voltage from 2.7V to 36V and draws only 100µA supply current on a 5V supply. The output swings to within 40mV of either supply rail.
The resistors have excellent matching, 0.04% over temperature for the 450k resistors. The matching temperature coefficent is guaranteed less than 3ppm/°C. The resistors are extremely linear with voltage, resulting in a gain nonlinearity of less than 10ppm.
The LT1991 is fully specified at 5V and ±15V supplies and from -40°C to 85°C. The device is available in space saving 10-lead MSOP and low profile (0.8mm) 3mm × 3mm DFN packages.
Features
Typical Application  | Applications
Packaging  |
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LT1991ACDD#PBF | 3x3 DFN-10 | C | $2.52 | $2.09 |
| LT1991ACDD#TRPBF | 3x3 DFN-10 | C | $2.15 | |
| LT1991ACMS#PBF | MS-10 | C | $2.28 | $1.89 |
| LT1991ACMS#TRPBF | MS-10 | C | $1.95 | |
| LT1991AIDD#PBF | 3x3 DFN-10 | I | $3.01 | $2.49 |
| LT1991AIDD#TRPBF | 3x3 DFN-10 | I | $2.55 | |
| LT1991AIMS#PBF | MS-10 | I | $2.77 | $2.29 |
| LT1991AIMS#TRPBF | MS-10 | I | $2.35 | |
| LT1991CDD#PBF | 3x3 DFN-10 | C | $2.10 | $1.59 |
| LT1991CDD#TRPBF | 3x3 DFN-10 | C | $1.65 | |
| LT1991CMS#PBF | MS-10 | C | $1.80 | $1.39 |
| LT1991CMS#TRPBF | MS-10 | C | $1.45 | |
| LT1991HDD#PBF | 3x3 DFN-10 | H | $2.30 | $1.90 |
| LT1991HDD#TRPBF | 3x3 DFN-10 | H | $1.96 | |
| LT1991HMS#PBF | MS-10 | H | $2.05 | $1.69 |
| LT1991HMS#TRPBF | MS-10 | H | $1.75 | |
| LT1991IDD#PBF | 3x3 DFN-10 | I | $2.30 | $1.90 |
| LT1991IDD#TRPBF | 3x3 DFN-10 | I | $1.96 | |
| LT1991IMS#PBF | MS-10 | I | $2.05 | $1.69 |
| LT1991IMS#TRPBF | MS-10 | I | $1.75 |
Demo Boards
| Part Number | Description | Price |
|---|---|---|
| DC819A | LT1990CS8/LT1991CMS/LT1995CMS | Configurable Gain Amplifiers, V+ = +2.5V to +15V, V- = -2.5V to -15V | $75.00 |
- DN348 - 在未采用外部电阻器的情况下获取精准增益
- DN448 - 采用 TSOT-23 封装的 12 位 DAC 包括双向 REF 引脚以连接运算放大器或外部高精度基准
- DN348 - Precise Gain Without External Resistors
- DN448 - 12-bit DAC in TSOT-23 Includes Bidirectional REF Pin for Connection to Op Amp or External High Precision Reference
- R423 - Reliability Data
- November 2004 - Versatile Op Amps Need No Resistors
- LT1991 - Product Press Release
- The Configurator Software Download
- LT1991 Footprints and Symbols
