LT1055/LT1056
1
10556fd
For more information www.linear.com/LT1055
TYPICAL APPLICATION
FEATURES DESCRIPTION
Precision, High Speed,
JFET Input Operational Amplifiers
The LT
®
1055/LT1056 JFET input operational amplifiers
combine precision specifications with high speed per-
formance.
For the first time
,
16V/µs slew rate and 6.5MHz gain
bandwidth 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 operating
currents. The lower power dissipation LT1055 achieves
lower bias and offset currents and offset voltage. The ad
-
ditional 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.
APPLICATIONS
n
Guaranteed Offset Voltage: 150µV Max
–55°C to 125°C: 500µV Max
n
Guaranteed Drift: 4µV/°C Max
n
Guaranteed Bias Current
70°C: 150pA Max
125°C: 2.5nA Max
n
Guaranteed Slew Rate: 12V/µs Min
n
Available in 8-Pin PDIP and SO Packages
n
Precision, High Speed Instrumentation
n
Logarithmic Amplifiers
n
D/A Output Amplifiers
n
Photodiode Amplifiers
n
Voltage-to-Frequency Converters
n
Frequency-to-Voltage Converters
n
Fast, Precision Sample-and-Hold
L, LT, LT C , LT M, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Distribution of Input Offset Voltage
(H Package)
1Hz to 10kHz Voltage-to-Frequency Converter
+
–
INPUT
10kHz
TRIM
5k
15V
2N3906
15V
–15V
LT1055/56 TA01
–15V
= 1N4148
0.001 (POLYSTYRENE)
0.1µF
THE LOW OFFSET VOLTAGE OF LT1056
CONTRIBUTES ONLY 0.1Hz OF ERROR
WHILE ITS HIGH SLEW RATE PERMITS
0.1µF
22k
75k
1.5k
LM329
3.3M
7
6
4
3
2
33pF
*1% FILM
OUTPUT
0.005%
LINEARITY
LT1056
INPUT OFFSET VOLTAGE (µV)
0
20
60
80
100
–400
0
200
40
120
400
–200
V
S
= ±15V
T
A
= 25°C
634 UNITS TESTED
FROM THREE RUNS
50% TO ±60µV