LT1055_1 Datasheet, PDF (1/16 Pages) Linear Technology – Precision, High Speed, JFET Input Operational Amplifiers

LT1055/LT1056
Precision, High Speed,
JFET Input Operational Amplifiers
FEATURES
■ _{Guaranteed Offset Voltage: 150µV Max}
–55°C to 125°C: 500µV Max
■ _{Guaranteed Drift: 4µV/°C Max}
■ _{Guaranteed Bias Current}
70°C: 150pA Max
125°C: 2.5nA Max
■ _{Guaranteed Slew Rate: 12V/µs Min}
■ _{Available in 8-Pin PDIP and SO Packages}
U
APPLICATIO S
■ _{Precision, High Speed Instrumentation}
■ _{Logarithmic Amplifiers}
■ _{D/A Output Amplifiers}
■ _{Photodiode Amplifiers}
■ _{Voltage-to-Frequency Converters}
■ _{Frequency-to-Voltage Converters}
■ _{Fast, Precision Sample-and-Hold}
DESCRIPTIO
The LT^®1055/LT1056 JFET input operational amplifiers
combine precision specifications with high speed perfor-
mance.
For the first time, 16V/µs slew rate and 6.5MHz gain
bandwidth product are simultaneously achieved with off-
set voltage of typically 50µV, 1.2µV/°C drift, bias currents
of 40pA at 70°C and 500pA at 125°C.
The 150µV maximum offset voltage specification is the
best available on any JFET input operational amplifier.
The LT1055 and LT1056 are differentiated by their operat-
ing currents. The lower power dissipation LT1055 achieves
lower bias and offset currents and offset voltage. The
additional power dissipation of the LT1056 permits higher
slew rate, bandwidth and faster settling time with a slight
sacrifice in DC performance.
The voltage-to-frequency converter shown below is one of
the many applications which utilize both the precision and
high speed of the LT1055/LT1056.
For a JFET input op amp with 23V/µs guaranteed slew rate,
refer to the LT1022 data sheet.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
1Hz to 10kHz Voltage-to-Frequency Converter
4.7k
3M
15V
0.001 (POLYSTYRENE)
10kHZ
TRIM
0V TO 10V ^5k
75k
INPUT
2N3906
= 1N4148
*1% FILM
–15V
0.1µF _22k
3.3M
2_–
15V
7
6
LT1056
3₊
4
–15V
33pF
OUTPUT
1Hz TO 10kHz
1.5k
0.005%
LINEARITY
LM329
0.1µF
THE LOW OFFSET VOLTAGE OF LT1056
CONTRIBUTES ONLY 0.1Hz OF ERROR
WHILE ITS HIGH SLEW RATE PERMITS
10kHz OPERATION.
LT1055/56 TA01
Distribution of Input Offset Voltage
(H Package)
140 _{VS = ±15V}
120
T_A = 25°C
634 UNITS TESTED
FROM THREE RUNS
100
50% TO ±60µV
80
60
40
20
0
–400 –200 0
200 400
INPUT OFFSET VOLTAGE (µV)
LT1055/56 TA02
10556fc
1