LT1990 Datasheet | Linear Technology

LT1990 ±250V Input Range G = 1, 10, Micropower, Difference Amplifier DESCRIPTIO The LT®1990 is a micropower precision difference amplifier with a very high mon mode input voltage range. It has pin selectable gains of 1 or 10. The LT1990 operates over a ±250V mon mode voltage range on a ±15V supply. The inputs are fault protected from mon mode voltage transients up to ±350V and differential voltages up to ±500V. The LT1990 is ideally suited for both high side and low side current or voltage monitoring. On a single 5V supply, the LT1990 has an adjustable 85V input range, 70d B min CMRR and draws less than 120µA supply current. The rail-to-rail output maximizes the dynamic range, especially important for single supplies as low as 2.7V. The LT1990 is specified for single 3V, 5V and ±15V supplies over both mercial and industrial temperature ranges. The LT1990 is available in the 8-pin SO package. , LTC and LT are registered trademarks of Linear Technology Corporation. - - - - - - - - - - - - Pin Selectable Gain of 1 or 10 High mon Mode Voltage Range: 85V Window (VS = 5V, 0V) ±250V (VS = ±15V) mon Mode Rejection Ratio: 70d B Min Input Protection to ±350V Gain Error: 0.28% Max PSRR: 82d B Min High Input Impedance: 2MΩ Differential, 500kΩ mon Mode Micropower: 120µA Max Supply Current Wide Supply Range: 2.7V to 36V - 3d B Bandwidth: 100k Hz Rail-to-Rail Output 8-Pin SO Package Features - - - - - - - Battery Cell Voltage Monitoring High Voltage Current Sensing Signal Acquisition in Noisy Environments Input Protection Fault Protected Front Ends Level Sensing Isolation TYPICAL APPLICATIO +VSOURCE Full-Bridge Load Current Monitor 5V LT1990 900k 7 2 1M 100k 10k 8 - + RS 3 VREF = 1.5V 4 IN OUT LT6650 GND FB 54.9k 1n F 40k 40k 20k 1 1µF 1990 TA01 1M - 12V ≤ VCM ≤ 73V VOUT = VREF ± (10 - IL - RS) - + U APPLICATIO S 6 VOUT 10k 900k 100k...