1

LT1055/LT1056

Precision, High Speed,

JFET Input Operational Amplifiers

–

+

0V TO 10V

INPUT

10kHZ

TRIM

5k

4.7k

15V

2N3906

15V

–15V

LT1055/56 TA01

–15V

= 1N4148

3M

0.001 (POLYSTYRENE)

0.1µF

THE LOW OFFSET VOLTAGE OF LT1056

CONTRIBUTES ONLY 0.1Hz OF ERROR

WHILE ITS HIGH SLEW RATE PERMITS

10kHz OPERATION.

0.1µF

22k

1.5k

LM329

3.3M

7

6

4

3

2

33pF

*1% FILM

OUTPUT

1Hz TO 10kHz

0.005%

LINEARITY

LT1056

FEATURES

s

Guaranteed Offset Voltage

150

µV Max

–55

°C to 125°C

500

µV Max

s

Guaranteed Drift

4

µV/°C Max

s

Guaranteed Bias Current

70

°C

150pA Max

125

°C

2.5nA Max

s

Guaranteed Slew Rate

12V/

µs Min

s

Precision, High Speed Instrumentation

s

Logarithmic Amplifiers

s

D/A Output Amplifiers

s

Photodiode Amplifiers

s

Voltage-to-Frequency Converters

s

Frequency-to-Voltage Converters

s

Fast, Precision Sample-and-Hold

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 50

µV, 1.2µV/°C drift, bias currents of

40pA at 70

°C and 500pA at 125°C.

The 150

µV 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.

Distribution of Input Offset Voltage

(H Package)

0kHz to 10kHz Voltage-to-Frequency Converter

INPUT OFFSET VOLTAGE (

µV)

0

20

60

80

100

140

–400

0

200

LT1055/56 TA02

40

120

400

–200

634 UNITS TESTED

FROM THREE RUNS

50% TO

±60µV