LT1990CS8 datasheet(1/16 Pages) LINER

Part #	LT1990CS8

Description	250V Input Range G = 1, 10, Micropower, Difference Amplifier

PDF	16 Pages

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT1990

1

1990f

■ Battery Cell Voltage Monitoring

■ High Voltage Current Sensing

■ Signal Acquisition in Noisy Environments

■ Input Protection

■ Fault Protected Front Ends

■ Level Sensing

■ Isolation

■ Pin Selectable Gain of 1 or 10

■

High Common Mode Voltage Range:

85V Window (VS = 5V, 0V)

±250V (VS = ±15V)

■

Common Mode Rejection Ratio: 70dB Min

■ Input Protection to ±350V

■ Gain Error: 0.28% Max

■

PSRR: 82dB Min

■ High Input Impedance: 2MΩ Differential,

500kΩ Common Mode

■

Micropower: 120µA Max Supply Current

■ Wide Supply Range: 2.7V to 36V

■ –3dB Bandwidth: 100kHz

■

Rail-to-Rail Output

■ 8-Pin SO Package

±250V Input Range

G = 1, 10, Micropower,

Difference Amplifier

The LT

®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 120µA

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.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Full-Bridge Load Current Monitor

RS

+VSOURCE

IL

–12V ≤ VCM ≤ 73V

VOUT = VREF ± (10 • IL • RS)

–

+

40k

100k

900k

1M

900k

10k

VOUT

LT1990

LT6650

GND

IN

OUT

FB

54.9k

20k

1nF

1µF

VREF = 1.5V

1990 TA01

5V

7

2

3

4

1

8

6

5

+

–

APPLICATIO S

DESCRIPTIO

FEATURES

TYPICAL APPLICATIO

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