LT1792
Low Noise, Precision,
JFET Input Op Amp
FEATURES
s
s
s
s
s
s
DESCRIPTIO
100% Tested Low Voltage Noise: 6nV/鈭欻z Max
A Grade 100% Temperature Tested
Voltage Gain: 1.2 Million Min
Offset Voltage Over Temp: 800碌V Max
Gain-Bandwidth Product: 5.6MHz Typ
Guaranteed Specifications with
鹵5V
Supplies
The LT
廬
1792 achieves a new standard of excellence in
noise performance for a JFET op amp. The 4.2nV/鈭欻z
voltage noise combined with low current noise and
picoampere bias currents make the LT1792 an ideal choice
for amplifying low level signals from high impedance
capacitive transducers.
The LT1792 is unconditionally stable for gains of 1 or more,
even with load capacitances up to 1000pF. Other key
features are 600碌V V
OS
and a voltage gain of over 4 million.
Each individual amplifier is 100% tested for voltage noise,
slew rate and gain bandwidth.
The design of the LT1792 has been optimized to achieve
true precision performance with an industry standard
pinout in the SO-8 package. Specifications are also pro-
vided for
鹵5V
supplies.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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s
s
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Photocurrent Amplifiers
Hydrophone Amplifiers
High Sensitivity Piezoelectric Accelerometers
Low Voltage and Current Noise Instrumentation
Amplifier Front Ends
Two and Three Op Amp Instrumentation Amplifiers
Active Filters
TYPICAL APPLICATIO
Low Noise Hydrophone Amplifier with DC Servo
5V TO 15V
1kHz Input Noise Voltage Distribution
V
S
=
鹵15V
T
A
= 25擄C
270 OP AMPS TESTED
LT1792
R2 C1*
200鈩?/div>
6
C2
0.47碌F
R4
1M
R5
1M
OUTPUT
PERCENT OF UNITS (%)
鈥?V TO 鈥?5V
C
T
HYDRO-
PHONE
R6
100k
6
LT1097
3
R7
1M
DC OUTPUT
鈮?/div>
2.5mV FOR T
A
< 70擄C
OUTPUT VOLTAGE NOISE = 128nV/鈭欻z AT 1kHz (GAIN = 20)
C1
鈮?/div>
C
T
鈮?/div>
100pF TO 5000pF; R4C2 > R8C
T
; *OPTIONAL
鈥?/div>
R8
100M
+
+
3
鈥?/div>
R1*
100M
R3
3.9k
40
2
7
30
4
20
2
10
0
3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6
INPUT VOLTAGE NOISE (nV/鈭欻z)
1792 TA02
1792 TA01
U
U
U
1
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