LT1008_1 Datasheet, PDF (1/16 Pages) Linear Technology – Picoamp Input Current, Microvolt Offset, Low Noise Op Amp

FEATURES
■ _{Guaranteed Bias Current}
T_A = 25°C: 100pA Max
T_A = – 55°C to 125°C: 600pA Max
■ _{Guaranteed Offset Voltage: 120μV Max}
■ _{Guaranteed Drift: 1.5μV/°C Max}
■ _{Low Noise, 0.1Hz to 10Hz: 0.5μVP-P}
■ _{Guaranteed Low Supply Current: 600μA Max}
■ _{Guaranteed CMRR: 114dB Min}
■ _{Guaranteed PSRR: 114dB Min}
■ _{Guaranteed Voltage Gain with 5mA Load Current}
■ _{Available in 8-Lead PDIP and SO Packages}
U
APPLICATIO S
■ _{Precision Instrumentation}
■ _{Charge Integrators}
■ _{Wide Dynamic Range Logarithmic Amplifiers}
■ _{Light Meters}
■ _{Low Frequency Active Filters}
■ _{Standard Cell Buffers}
■ _{Thermocouple Amplifiers}
LT1008
Picoamp Input Current,
Microvolt Offset,
Low Noise Op Amp
DESCRIPTIO
The LT^®1008 is a universal precision operational amplifier
that can be used in practically all precision applications.
The LT1008 combines for the first time, picoampere bias
currents (which are maintained over the full – 55°C to
125°C temperature range), microvolt offset voltage (and
low drift with time and temperature), low voltage and
current noise, and low power dissipation. Extremely high
common mode and power supply rejection ratios, and the
ability to deliver 5mA load current with high voltage gain
round out the LT1008’s superb precision specifications.
The all around excellence of the LT1008 eliminates the
necessity of the time consuming error analysis procedure
of precision system design in many applications; the
LT1008 can be stocked as the universal precision op amp.
The LT1008 is externally compensated with a single ca-
pacitor for additional flexibility in shaping the frequency
response of the amplifier. It plugs into and upgrades all
standard LM108A/LM308A applications. For an internally
compensated version with even lower offset voltage but
otherwise similar performance see the LT1012.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Input Amplifier for 4.5 Digit Voltmeter
INPUT
1000pF
0.1V
1V
9M
10V
900k
100V
90k
1000V
10k
2 ^–1
15V
8
100k
LT1008
5% _{3 +}
4
76
9k*
–15V
1k*
0.1V
1V
10V
100V
1000V TO 1V FULL-SCALE
ANALOG-TO-DIGITAL
CONVERTER
*RATIO MATCH ±0.01%
FN507
ALLEN BRADLEY
DECADE VOLTAGE DIVIDER
THIS APPLICATION REQUIRES LOW
BIAS CURRENT AND OFFSET VOLTAGE,
LOW NOISE AND LOW DRIFT WITH
TIME AND TEMPERATURE
1008 TA01
Input Bias Current vs Temperature
100
50
UNDERCANCELLED UNIT
0
OVERCANCELLED UNIT
–50
–100
–150
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1008 TA02
1008fb
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