Datasheet LTC1250 (Analog Devices)

LTC1250 Very Low Noise Zero-Drift Bridge Amplifier
U FEATURES DESCRIPTIO
■ Very Low Noise: 0.75µVP-P Typ, 0.1Hz to 10Hz The LTC®1250 is a high performance, very low noise zero- ■ DC to 1Hz Noise Lower Than OP-07 drift operational amplifier. The LTC1250’s combination of ■ Full Output Swing into 1k Load low front-end noise and DC precision makes it ideal for use ■ Offset Voltage: 10µV Max with low impedance bridge transducers. The LTC1250 ■ Offset Voltage Drift: 50nV/°C Max features typical input noise of 0.75µVP-P from 0.1Hz to ■ Common Mode Rejection Ratio: 110dB Min 10Hz, and 0.2µVP-P from 0.1Hz to 1Hz. The LTC1250 has ■ Power Supply Rejection Ratio: 115dB Min DC to 1Hz noise of 0.35µVP-P, surpassing that of low noise ■ No External Components Required bipolar parts including the OP-07, OP-77, and LT1012. ■ Pin Compatible with Standard 8-Pin Op Amps The LTC1250 uses the industry-standard single op amp ■ Available in Standard 8-Pin Plastic DIP pinout, and requires no external components or nulling and 8-Pin SO Packages signals, allowing it to be a plug-in replacement for bipolar op amps.
U APPLICATIO S
The LTC1250 incorporates an improved output stage capable of driving 4.3V into a 1k load with a single 5V ■ Electronic Scales supply; it will swing ±4.9V into 5k with ±5V supplies. The ■ Strain Gauge Amplifiers input common mode range includes ground with single ■ Thermocouple Amplifiers power supply voltages above 12V. Supply current is 3mA ■ High Resolution Data Acquisition with a ±5V supply, and overload recovery times from ■ Low Noise Transducers positive and negative saturation are 0.5ms and 1.5ms, ■ Instrumentation Amplifiers respectively. The internal nulling clock is set at 5kHz for , LTC and LT are registered trademarks of Linear Technology Corporation. All other optimum low frequency noise and offset drift; no external trademarks are the property of their respective owners. Protected by U.S. Patents connections are necessary. including 4933642. The LTC1250 is available in a standard 8-pin plastic DIP and 8-pin SO packages.
U TYPICAL APPLICATIO Differential Bridge Amplifier Input Referred Noise 0.1Hz to 10Hz
5V 5V 2 VS = ±5V 50Ω AV = 10k 1000pF GAIN 0.1µF TRIM 1 18.2k V 0 350 µ Ω 2 7 STRAIN – GAUGE 6 LTC1250 AV = 100 3 –1 + 4 1000pF 18.2k –2 0 2 4 6 8 10 –5V –5V 1250 TA01 TIME (s) LT1250 TA02 1250fb 1