LT1990 Linear Technology, LT1990 Datasheet

LT1990

Manufacturer Part Number

LT1990

Description

Difference Amplifier

Manufacturer

Linear Technology

Datasheet

1.LT1990.pdf (16 pages)

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TYPICAL APPLICATIO

APPLICATIO S

■

FEATURES

Pin Selectable Gain of 1 or 10

High Common Mode Voltage Range:

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

Battery Cell Voltage Monitoring

High Voltage Current Sensing

Signal Acquisition in Noisy Environments

Input Protection

Fault Protected Front Ends

Level Sensing

Isolation

85V Window (V

±250V (V

= ±15V)

SOURCE

OUT

–12V ≤ V

= 5V, 0V)

= V

–

REF

± (10 • I

≤ 73V

• R

)

LT6650

Full-Bridge Load Current Monitor

GND

OUT

54.9k

20k

REF

1µF

DESCRIPTIO

The LT

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.

= 1.5V

1nF

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

1990 is a micropower precision difference ampli-

G = 1, 10, Micropower,

LT1990

Difference Amplifier

40k

±250V Input Range

40k

–

900k

100k

10k

1990 TA01

OUT

LT1990

1990f

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