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LT1792 Datasheet PDF : 12 Pages
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LT1792
TYPICAL PERFOR A CE CHARACTERISTICS
THD and Noise vs Output
Amplitude for Noninverting Gain
1
ZL = 2k 15pF, fO = 1kHz
AV = 1, 10, 100
MEASUREMENT BANDWIDTH
0.1 = 10Hz TO 22kHz
AV = 100
0.01
0.001
AV = 10
AV = 1
THD and Noise vs Output
Amplitude for Inverting Gain
1
ZL = 2k 15pF, fO = 1kHz
AV = – 1, – 10, – 100
MEASUREMENT BANDWIDTH
0.1 = 10Hz TO 22kHz
0.01
0.001
AV = –100
AV = –10
AV = –1
0.0001
0.3
1
10
OUTPUT SWING (VP-P)
30
1792 G18
Short-Circuit Output Current
vs Temperature
40
VS = ±15V
35
30
SINK
SOURCE
25
20
15
10
– 75 – 50 – 25 0 25 50 75 100 125
TEMPERATURE (°C)
1792 G20
0.0001
0.3
1
10
OUTPUT SWING (VP-P)
30
1792 G19
Supply Current vs Temperature
5
VS = ±15V
4
VS = ± 5V
3
– 75 – 50 – 25 0 25 50 75 100 125
TEMPERATURE (°C)
1792 G21
APPLICATI S 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
15V
15V
2–
3+
1
7
6
4
5
∆VOS = ±10mV
50k
2–
7
6
3+
4
5
1
∆VOS = ±1mV
10k 10k
– 15V
1792 F01a
50k
– 15V
1792 F01b
(a)
(b)
Figure 1
7
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