LT1250 Linear Technology, LT1250 Datasheet

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LT1250

Manufacturer Part Number
LT1250
Description
Very Low Noise Zero-Drift Bridge Amplifier
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
PPLICATI
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
Very Low Noise: 0.75 V
DC to 1Hz Noise Lower Than OP-07
Full Output Swing into 1k Load
Offset Voltage: 10 V 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
Electronic Scales
Strain Gauge Amplifiers
Thermocouple Amplifiers
High Resolution Data Acquisition
Low Noise Transducers
Instrumentation Amplifiers
A
S
STRAIN
GAUGE
O
PPLICATI
350
–5V
5V
U
50
GAIN
TRIM
Differential Bridge Amplifier
S
P-P
1000pF
Typ, 0.1Hz to 10Hz
O
U
0.1 F
18.2k
2
3
+
LTC1250
–5V
5V
7
4
1000pF
18.2k
6
A
V
1250 TA01
= 100
D
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
features typical input noise of 0.75 V
10Hz, and 0.2 V
DC to 1Hz noise of 0.35 V
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.
Zero-Drift Bridge Amplifier
ESCRIPTIO
®
1250 is a high performance, very low noise zero-
P-P
–2
–1
2
1
0
Input Referred Noise 0.1Hz to 10Hz
0
U
from 0.1Hz to 1Hz. The LTC1250 has
V
A
S
V
= ±5V
= 10k
Very Low Noise
P-P
2
, surpassing that of low noise
4
TIME (s)
6
P-P
LTC1250
from 0.1Hz to
8
LT1250 TA02
10
1

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LT1250 Summary of contents

Page 1

... A = 100 LTC1250 18.2k –5V 1250 TA01 LTC1250 Very Low Noise U from 0.1Hz to P-P from 0.1Hz to 1Hz. The LTC1250 has P-P , surpassing that of low noise P-P Input Referred Noise 0.1Hz to 10Hz ± 10k –1 – TIME (s) LT1250 TA02 1 ...

Page 2

LTC1250 BSOLUTE – Total Supply Voltage ( ............................. 18V + Input Voltage ........................ (V + 0.3V Output Short Circuit Duration ......................... Indefinite Operating Temperature Range LTC1250M..................................... – ...

Page 3

ELECTRICAL C HARA TERISTICS C SYMBOL PARAMETER Maximum Output Voltage Swing I Supply Current S f Sampling Frequency S The denotes specifications which apply over the full operating temperature range. Note 1: These parametes are guaranteed by design. Thermocouple effects ...

Page 4

LTC1250 W U TYPICAL PERFOR A Voltage Noise vs Frequency ± 100 1k 10k FREQUENCY (Hz) LTC1250 G11 Overload Recovery 0.2 0 ...

Page 5

W U TYPICAL PERFOR A Output Swing vs Output Current, 5V Supply ± –1 –2 –3 –4 –5 0.01 0.1 1 OUTPUT CURRENT (mA) LTC1250 G16 TEST CIRCUITS Offset Test Circuit ...

Page 6

LTC1250 PPLICATI S I FOR ATIO A frequency, approaching the best bipolar op amps at 10Hz and surpassing them below 1Hz (Figure 1). All this is accomplished in an industry-standard pinout; the LTC1250 requires no external capacitors, ...

Page 7

... Input Capacitance and Compensation on Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 8

... SO8 0294 LT/GP 0894 2K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1994 V OUT 100mV/°C 1250 TA04 0.130 ± 0.005 0.125 0.015 (3.175) MIN (0.380) MIN N8 0694 ...

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