7

LT1792

CC

HARA TERISTICS

A

TYPICALPERFOR

CE

THD and Noise vs Output

Amplitude for Noninverting Gain

0.001

0.01

0.1

1

110

30

1792 G18

0.0001

0.3

MEASUREMENT BANDWIDTH

= 10Hz TO 22kHz

THD and Noise vs Output

Amplitude for Inverting Gain

0.001

0.01

0.1

1

110

30

1792 G19

0.0001

0.3

MEASUREMENT BANDWIDTH

= 10Hz TO 22kHz

TEMPERATURE (

°C)

–75

10

15

20

25

30

–25

50

25

100

1792 G20

35

40

–50

0

75

125

SINK

SOURCE

Short-Circuit Output Current

vs Temperature

TEMPERATURE (

°C)

–75

3

4

–25

50

25

100

1792 G21

5

–50

0

75

125

Supply Current vs Temperature

Figure 1

2

3

1

5

50k

15V

– 15V

1792 F01a

4

6

7

2

3

1

5

50k

10k

10k

15V

– 15V

1792 F01b

4

6

7

(b)

(a)

S

APPLICATI

I FOR ATIO

The LT1792 may be inserted directly into OPA124, AD743,

AD745, AD645, AD544 and AD820 sockets with improved

noise performance. Offset nulling will be compatible with

these devices with the wiper of the potentiometer tied to

the negative supply (Figure 1a). No appreciable change in

offset voltage drift with temperature will occur when the

device is nulled with a potentiometer ranging from 10k to

200k. Finer adjustments can be made with resistors in

series with the potentiometer (Figure 1b).

Being a low voltage noise JFET op amp, the LT1792 can

replace many bipolar op amps that are used in amplifying

low level signals from high impedance transducers. The