1

LT1055/LT1056

10556fc

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)

0.1

µF

THE LOW OFFSET VOLTAGE OF LT1056

CONTRIBUTES ONLY 0.1Hz OF ERROR

WHILE ITS HIGH SLEW RATE PERMITS

10kHz OPERATION.

0.1

µF 22k

75k

1.5k

LM329

3.3M

7

6

4

3

2

33pF

*1% FILM

OUTPUT

1Hz TO 10kHz

0.005%

LINEARITY

LT1056

■

Guaranteed Offset Voltage: 150

µV Max

–55

°C to 125°C: 500µV Max

■

Guaranteed Drift: 4

µV/°C Max

■

Guaranteed Bias Current

70

°C: 150pA Max

125

°C: 2.5nA Max

■

Guaranteed Slew Rate: 12V/

µs Min

The LT

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 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.

Distribution of Input Offset Voltage

(H Package)

1Hz 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

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.