LTC1250 データシートの表示（PDF） - Linear Technology

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LTC1250

Very Low Noise Zero-Drift Bridge Amplifier

Linear Technology 

FEATURES

■ Very Low Noise: 0.75µVP-P Typ, 0.1Hz to 10Hz

■ DC to 1Hz Noise Lower Than OP-07

■ Full Output Swing into 1k Load

■ Offset Voltage: 10µV Max

■ Offset Voltage Drift: 50nV/°C Max

■ Common Mode Rejection Ratio: 110dB Min

■ Power Supply Rejection Ratio: 115dB Min

■ No External Components Required

■ Pin Compatible with Standard 8-Pin Op Amps

■ Available in Standard 8-Pin Plastic DIP

and 8-Pin SO Packages

U

APPLICATIO S

■ Electronic Scales

■ Strain Gauge Amplifiers

■ Thermocouple Amplifiers

■ High Resolution Data Acquisition

■ Low Noise Transducers

■ Instrumentation Amplifiers

, 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.

LTC1250

Very Low Noise

Zero-Drift Bridge Amplifier

DESCRIPTIO

The LTC®1250 is a high performance, very low noise zero-

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

features typical input noise of 0.75µVP-P from 0.1Hz to

10Hz, and 0.2µVP-P from 0.1Hz to 1Hz. The LTC1250 has

DC to 1Hz noise of 0.35µVP-P, surpassing that of low noise

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.

TYPICAL APPLICATIO

Differential Bridge Amplifier

5V

5V

50Ω

GAIN

TRIM

0.1µF

1000pF

18.2k

350Ω

STRAIN

GAUGE

2– 7

LTC1250

6

3+

4

1000pF 18.2k

–5V

–5V

AV = 100

1250 TA01

Input Referred Noise 0.1Hz to 10Hz

2

VS = ±5V

AV = 10k

1

0

–1

–2

0

2

4

6

8

10

TIME (s)

LT1250 TA02

1250fb

1

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