LT1990-10

1

Rev 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

±250V Input Range,

100kHz, G =10, Micropower,

Difference Amplifier

The LT®1990-10 is a micropower precision difference am-

plifier with a very high common mode input voltage range,

a fixed gain of 10 and 100kHz bandwidth. The LT1990-10

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 LT1990-10 is ideally suited for

both high side and low side current or voltage monitoring.

On a single 5V supply, the LT1990-10 has an adjustable

85V input range, 60dB min CMRR and draws less than

180µA supply current. The rail-to-rail output maximizes

the dynamic range, especially important for single sup-

plies as low as 2.7V.

The LT1990-10 is specified for single 3V, 5V and ±15V

supplies over the industrial temperature range.

The LT1990-10 is available in the 8-pin SO and pin FMEA

compatible MSOP packages.

Full-Bridge Load Current Monitor

APPLICATIONS

n

Gain = 10

n

–3dB Bandwidth = 100kHz

n

High Common Mode Voltage Range:

n

±250V (VS = ±15V)

n

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

n

Common Mode Rejection Ratio: 60dB Min

n

Input Protection to ±350V

n

Gain Error: 0.8% Max

n

PSRR: 82dB Min

n

High Input Impedance: 2MΩ Differential,

500kΩ Common Mode

n

Micropower: 180µA Max Supply Current

n

Wide Supply Range: 2.7V to 36V

n

Rail-to-Rail Output

n

8-pin SO and pin FMEA Compatible MSOP Packages

n

Battery Cell Voltage Monitoring

n

High Voltage Current Sensing

n

Signal Acquisition in Noisy Environments

n

Input Protection

n

Fault Protected Front Ends

n

Level Sensing

n

Isolation

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RS

+VSOURCE

IL

–12V ≤ VCM ≤ 73V

VOUT = VREF ± (10 • IL • RS)

–

+

40k 40k

100k

100k

900k

1M

1M

900k

10k

10k

VOUT

LT1990-10

LT6650

GND

IN

OUT

FB

54.9k

20k

1nF

1µF

VREF = 1.5V

199010 TA01

5V

+

–