LT1055/LT1056
Precision, High Speed,
JFET Input Operational Amplifiers
U
DESCRIPTIO
FEATURES
The LT®1055/LT1056 JFET input operational amplifiers
combineprecisionspecificationswithhighspeedperfor-
mance.
■
Guaranteed Offset Voltage: 150µV Max
–55°C to 125°C: 500µV Max
■
Guaranteed Drift: 4µV/°C Max
Guaranteed Bias Current
■
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.
70°C: 150pA Max
125°C: 2.5nA Max
■
Guaranteed Slew Rate: 12V/µs Min
■
Available in 8-Pin PDIP and SO Packages
The 150µV maximum offset voltage specification is the
best available on any JFET input operational amplifier.
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APPLICATIO S
The LT1055 and LT1056 are differentiated by their operat-
ingcurrents.ThelowerpowerdissipationLT1055achieves
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.
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Precision, High Speed Instrumentation
■
Logarithmic Amplifiers
■
D/A Output Amplifiers
■
Photodiode Amplifiers
■
Voltage-to-Frequency Converters
■
Frequency-to-Voltage Converters
Thevoltage-to-frequencyconvertershownbelowisoneof
the many applications which utilize both the precision and
high speed of the LT1055/LT1056.
■
Fast, Precision Sample-and-Hold
ForaJFETinputopampwith23V/µsguaranteedslewrate,
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.
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TYPICAL APPLICATIO
Distribution of Input Offset Voltage
1Hz to 10kHz Voltage-to-Frequency Converter
(H Package)
4.7k
3M
140
120
15V
V
= ±15V
= 25°C
50% TO ± 60µV
S
A
T
0.001 (POLYSTYRENE)
634 UNITS TESTED
FROM THREE RUNS
10kHZ
TRIM
5k
100
OUTPUT
15V
2
75k
1Hz TO 10kHz
0.005%
0V TO 10V
INPUT
–
7
80
60
40
20
1.5k
6
LINEARITY
LT1056
0.1µF
22k
3
4
+
–15V
33pF
LM329
3.3M
2N3906
0.1µF
= 1N4148
0
–200
0
200
400
–400
*1% FILM
THE LOW OFFSET VOLTAGE OF LT1056
CONTRIBUTES ONLY 0.1Hz OF ERROR
WHILE ITS HIGH SLEW RATE PERMITS
10kHz OPERATION.
–15V
INPUT OFFSET VOLTAGE (µV)
LT1055/56 TA02
LT1055/56 TA01
10556fc
1