LTC1250(RevA) View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1250 Datasheet PDF : 8 Pages
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LTC1250
Very Low Noise
Zero-Drift Bridge Amplifier
FEATURES
s Very Low Noise: 0.75µVP-P Typ, 0.1Hz to 10Hz
s DC to 1Hz Noise Lower Than OP-07
s Full Output Swing into 1k Load
s Offset Voltage: 10µV Max
s Offset Voltage Drift: 50nV/°C Max
s Common-Mode Rejection Ratio: 110dB Min
s Power Supply Rejection Ratio: 115dB Min
s No External Components Required
s Pin-Compatible with Standard 8-Pin Op Amps
APPLICATI S
s Electronic Scales
s Strain Gauge Amplifiers
s Thermocouple Amplifiers
s High Resolution Data Acquisition
s Low Noise Transducers
s Instrumentation Amplifiers
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
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 standard 8-pin ceramic and
plastic DIPs, as well as an 8-pin SOIC package.
TYPICAL APPLICATI
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
1
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