LT1792 Linear Technology, LT1792 Datasheet - Page 7

• Manufacturer Part Number: LT1792
• Description: Low Noise/ Precision/ JFET Input Op Amp
• Manufacturer: Linear Technology

A
TYPICAL PERFOR
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
PPLICATI
0.0001
O
0.001
0.01
0.1
40
30
25
15
10
35
20
1
U
– 75
0.3
Short-Circuit Output Current
vs Temperature
THD and Noise vs Output
Amplitude for Noninverting Gain
V
Z
A
MEASUREMENT BANDWIDTH
= 10Hz TO 22kHz
S
S
L
V
= 15V
= 2k
– 50
= 1, 10, 100
I FOR ATIO
U
– 25
W
A
1
OUTPUT SWING (V
15pF, f
V
TEMPERATURE ( C)
= 1
SINK
A
0
O
U
= 1kHz
A
A
V
25
W
V
CE
= 10
= 100
SOURCE
50
P-P
C
)
HARA TERISTICS
75
10
100
1792 G18
U
1792 G20
30
125
C
2
3
–
+
0.0001
1
0.001
0.01
0.1
15V
1
5
4
3
– 75
0.3
7
5
50k
(a)
Supply Current vs Temperature
THD and Noise vs Output
Amplitude for Inverting Gain
– 15V
Z
A
MEASUREMENT BANDWIDTH
= 10Hz TO 22kHz
L
V
4
= 2k
– 50
= – 1, – 10, – 100
6
V
OS
– 25
OUTPUT SWING (V
1
15pF, f
= 10mV
1792 F01a
TEMPERATURE ( C)
A
A
A
V
0
V
V
= –10
V
O
V
= –1
= –100
S
S
= 1kHz
Figure 1
= 15V
= 5V
25
50
P-P
)
75
10
2
3
–
+
100
1792 G19
1
10k
1792 G21
15V
30
125
5
7
10k
50k
(b)
– 15V
LT1792
4
6
V
OS
= 1mV
1792 F01b
7