LTC1052/LTC7652
Zero-Drift
Operational Amplifier
FEATURES
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DESCRIPTIO
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Guaranteed
Max Offset: 5µV
Guaranteed
Max Offset Drift: 0.05µV/°C
Typ Offset Drift: 0.01µV/°C
Excellent Long Term Stability: 100nV/√Month
Guaranteed
Max Input Bias Current: 30pA
Over Operating Temperature Range:
Guaranteed
Min Gain: 120dB
Guaranteed
Min CMRR: 120dB
Guaranteed
Min PSRR: 120dB
Single Supply Operation: 4.75V to 16V
(Input Voltage Range Extends to Ground)
External Capacitors can be Returned to V
–
with No
Noise Degradation
The LTC
®
1052 and LTC7652 are low noise zero-drift op
amps manufactured using Linear Technology’s enhanced
LTCMOS
TM
silicon gate process. Chopper-stabilization
constantly corrects offset voltage errors. Both initial offset
and changes in the offset due to time, temperature and
common mode voltage are corrected. This, coupled with
picoampere input currents, gives these amplifiers
unmatched performance.
Low frequency (1/f) noise is also improved by the
chopping technique. Instead of increasing continuously
at a 3dB/octave rate, the internal chopping causes noise to
decrease at low frequencies.
The chopper circuitry is entirely internal and completely
transparent to the user. Only two external capacitors
are required to alternately sample-and-hold the offset
correction voltage and the amplified input signal. Control
circuitry is brought out on the 14-pin and 16-pin versions
to allow the sampling of the LTC1052 to be synchronized
with an external frequency source.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS is a trademark of Linear Technology Corporation.
Teflon is a trademark of DuPont.
APPLICATIO S
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Thermocouple Amplifiers
Strain Gauge Amplifiers
Low Level Signal Processing
Medical Instrumentation
TYPICAL APPLICATIO
5V
3
Ultralow Noise, Low Drift Amplifier
160
VOLTAGE NOISE DENSITY (nV/√Hz)
+
–
1
7
6
8
4
0.1µF
–5V
0.1µF
140
120
100
80
60
40
20
0
0
100
200
300
400
500
LTC1052
2
0.1µF
5V
100k
INPUT
3K
3
+
–
1 5V
7
68k
8
6
1.5k
5V
LT
®
1007
2
4
– 5V
OUTPUT
100k
VOS = 3µV
VOS∆T = 50nV/°C
NOISE = 0.06µV
P-P
0.1Hz TO 10Hz
100Ω
LTC1052/7652 • TA01
U
Noise Spectrum
FREQUENCY (Hz)
LTC1052/7652 • TA02
U
U
1052fa
1
LINER [ LINEAR TECHNOLOGY ]
