LTC1052_15 Datasheet, PDF (1/24 Pages) Linear Technology – Zero-Drift Operational Amplifier

LTC1052/LTC7652
Zero-Drift
Operational Amplifier
FEATURES
■ _{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
U
APPLICATIO S
■ _{Thermocouple Amplifiers}
■ _{Strain Gauge Amplifiers}
■ _{Low Level Signal Processing}
■ _{Medical Instrumentation}
DESCRIPTIO
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.
TYPICAL APPLICATIO
INPUT
Ultralow Noise, Low Drift Amplifier
5V
3_{+ 7}
LTC1052
2_{– 4}
1
0.1µF
6
8
0.1µF
–5V
0.1µF
5V
100k
3K
1 ^{5V 68k}
3_{+ 7}
8
LT^®1007
2_{– 4}
6
– 5V
VOS _{= 3µV}
VOS_{∆T = 50nV/°C}
NOISE = 0.06µV_P-P 0.1Hz TO 10Hz
1.5k
5V
OUTPUT
100k
100Ω
LTC1052/7652 • TA01
160
140
120
100
80
60
40
20
0
0
Noise Spectrum
100 200 300 400 500
FREQUENCY (Hz)
LTC1052/7652 • TA02
1052fa
1