LT1055/LT1056
Precision, High Speed,
JFET Input Operational Amplifiers
FEATURES
s
s
s
DESCRIPTION
150µV Max
500µV Max
4µV/°C Max
150pA Max
2.5nA Max
12V/µs Min
The LT1055/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-ban-
width product are simultaneously achieved with offset
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.
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
s
Guaranteed
Offset Voltage
–55°C to 125°C
Guaranteed
Drift
Guaranteed
Bias Current
70°C
125°C
Guaranteed
Slew Rate
APPLICATIONS
s
s
s
s
s
s
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
TYPICAL APPLICATION
0kHz to 10kHz Voltage-to-Frequency Converter
4.7k
15V
3M
140
0.001 (POLYSTYRENE)
10kHZ
TRIM
5k
OUTPUT
1Hz TO 10kHz
0.005%
LINEARITY
120
NUMBER OF UNITS
100
80
60
40
20
0.1µF
0
–15V
THE LOW OFFSET VOLTAGE OF LT1056
CONTRIBUTES ONLY 0.1Hz OF ERROR
WHILE ITS HIGH SLEW RATE PERMITS
10kHz OPERATION.
–400
–200
200
400
0
INPUT OFFSET VOLTAGE (µV)
LT1055/56 TA02
LT1055/56 TA01
0V TO 10V
INPUT
2
+
–
33pF
15V
7
LT1056
6
4
–15V
1.5k
0.1µF
22k
3
3.3M
2N3906
= 1N4148
*1% FILM
LM329
U
U
U
Distribution of Input Offset Voltage
(H Package)
V
S
=
±15V
T
A
= 25°C
634 UNITS TESTED
FROM THREE RUNS
50% TO
±60µV
1
LINER [ LINEAR TECHNOLOGY ]
