LT1792_15 Datasheet, PDF (1/12 Pages) Linear Technology – Low Noise, Precision, JFET Input Op Amp

LT1792
Low Noise, Precision,
JFET Input Op Amp
FEATURES
s _{100% Tested Low Voltage Noise: 6nV/√Hz Max}
s _{A Grade 100% Temperature Tested}
s _{Voltage Gain: 1.2 Million Min}
s _{Offset Voltage Over Temp: 800µV Max}
s _{Gain-Bandwidth Product: 5.6MHz Typ}
s _{Guaranteed Specifications with ±5V Supplies}
U
APPLICATIO S
s _{Photocurrent Amplifiers}
s _{Hydrophone Amplifiers}
s _{High Sensitivity Piezoelectric Accelerometers}
s _{Low Voltage and Current Noise Instrumentation}
Amplifier Front Ends
s _{Two and Three Op Amp Instrumentation Amplifiers}
s _{Active Filters}
DESCRIPTIO
The LT^®1792 achieves a new standard of excellence in
noise performance for a JFET op amp. The 4.2nV/√Hz
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 600µV 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 ±5V supplies.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Low Noise Hydrophone Amplifier with DC Servo
R1*
100M
R3
3.9k
5V TO 15V
2– 7
R2 ^C1*
200Ω
LT1792
3+
4
6
C2
0.47µF
–5V TO –15V
R4
HYDRO-
C_T
R8
100M
R6
100k
PHONE
R7
2
1M
6
LT1097
R5
3 ^1M
1M
OUTPUT
DC OUTPUT ≤ 2.5mV FOR T_A < 70°C
OUTPUT VOLTAGE NOISE = 128nV/√Hz AT 1kHz (GAIN = 20)
C1 ≈ C_T ≈ 100pF TO 5000pF; R4C2 > R8C_T; *OPTIONAL
1792 TA01
1kHz Input Noise Voltage Distribution
V_S = ±15V
40 T_A = 25°C
30
270 OP AMPS TESTED
20
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/√Hz)
1792 TA02
1