LT1990

Features:

Battery Cell Voltage Monitoring
High Voltage Current Sensing
Signal Acquisition in Noisy Environments
Input Protection
Fault Protected Front Ends
Level Sensing
Isolation


Application

Pin Selectable Gain of 1 or 10
High Common Mode Voltage Range:85V Window (V_S = 5V, 0V)±250V (V_S = ±15V)
Common Mode Rejection Ratio: 70dB Mi
Input Protection to ±350V
Gain Error: 0.28% Max
PSRR: 82dB Min
High Input Impedance: 2M? Differential,500k? Common Mode
Micropower: 120A Max Supply Current
Wide Supply Range: 2.7V to 36V
3dB Bandwidth: 100kHz
Rail-to-Rail Output
8-Pin SO Package


Pinout




Specifications

(Notes 1, 2)
Total Supply Voltage (V⁺  to V)............................... 36V
Input Voltage Range
Continuous...................................................... ±250V
Transient (0.1s)............................................... ±350V
Differential....................................................... ±500V
Output Short-Circuit Duration (Note 3)............Indefinite
Operating Temperature Range (Note 4)...40 to 85
Specified Temperature Range (Note 5)....40 to 85
Storage Temperature Range..................65 to 150
Lead Temperature (Soldering, 10 sec.).................300


Description

The LT^(R) 1990 is a micropower precision difference ampli-fier with a very high common mode input voltage range. It has pin selectable gains of 1 or 10. The LT1990 operates over a ±250V common mode voltage range on a ±15V supply. The inputs are fault protected from common 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, 70dB min CMRR and draws less than 120A supply current. The rail-to-rail output maximizes the dy-namic range, especially important for single supplies as low as 2.7V.The LT1990 is specified for single 3V, 5V and ±15V supplies over both commercial and industrial temperature ranges. The LT1990 is available in the 8-pin SO package.