LTC1250

1

1250fb

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

trademarks are the property of their respective owners. Protected by U.S. Patents

including 4933642.

–

+

5V

–5V

1000pF

18.2k

1000pF

18.2k

7

6

4

3

2

–5V

0.1µF

5V

1250 TA01

350Ω

STRAIN

GAUGE

50Ω

GAIN

TRIM

LTC1250

TIME (s)

0

1

2

8

LT1250 TA02

0

–1

–2

2

4

6

10

TYPICAL APPLICATIO

APPLICATIO S

DESCRIPTIO

FEATURES

Very Low Noise

Zero-Drift Bridge Amplifier

■

■

Offset Voltage: 10µV Max

■

Power Supply Rejection Ratio: 115dB Min

■

Available in Standard 8-Pin Plastic DIP

and 8-Pin SO Packages

The LTC

drift operational amplifier. The LTC1250’s combination of

low front-end noise and DC precision makes it ideal for use

with low impedance bridge transducers. The LTC1250

bipolar parts including the OP-07, OP-77, and LT1012.

The LTC1250 uses the industry-standard single op amp

pinout, and requires no external components or nulling

signals, allowing it to be a plug-in replacement for bipolar

op amps.

The LTC1250 incorporates an improved output stage

capable of driving 4.3V into a 1k load with a single 5V

supply; it will swing ±4.9V into 5k with ±5V supplies. The

input common mode range includes ground with single

power supply voltages above 12V. Supply current is 3mA

with a ±5V supply, and overload recovery times from

positive and negative saturation are 0.5ms and 1.5ms,

respectively. The internal nulling clock is set at 5kHz for

optimum low frequency noise and offset drift; no external

connections are necessary.

The LTC1250 is available in a standard 8-pin plastic DIP

and 8-pin SO packages.

Input Referred Noise 0.1Hz to 10Hz

Differential Bridge Amplifier