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PDF LT1792 Data sheet ( Hoja de datos )
| Número de pieza | LT1792 | |
| Descripción | Low Noise/ Precision/ JFET Input Op Amp | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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 VOS 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
R2 C1*
200Ω
5V TO 15V
2– 7
LT1792
3+
4
6
–5V TO –15V
HYDRO-
CT
R8
100M
R6
100k
PHONE
R7
1M
6
C2
0.47µF
2
LT1097
3
R4
1M
R5
1M
OUTPUT
DC OUTPUT ≤ 2.5mV FOR TA < 70°C
OUTPUT VOLTAGE NOISE = 128nV/√Hz AT 1kHz (GAIN = 20)
C1 ≈ CT ≈ 100pF TO 5000pF; R4C2 > R8CT; *OPTIONAL
1792 TA01
1kHz Input Noise Voltage Distribution
VS = ±15V
40 TA = 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
1 page  
LT1792
TYPICAL PERFOR A CE CHARACTERISTICS
0.1Hz to 10Hz Voltage Noise
0 2 4 6 8 10
TIME (SEC)
1792 G01
Input Bias and Offset Current
Over the Common Mode Range
400
TA = 25°C
VS = ±15V
NOT WARMED UP
300
200
BIAS CURRENT
100
0
–15
OFFSET CURRENT
–10 –5 0 5 10
COMMON-MODE RANGE (V)
15
1792 G22
Common Mode Rejection Ratio
vs Frequency
120
TA = 25°C
VS = ± 15V
100
80
60
40
20
0
1k 10k 100k 1M 10M
FREQUENCY (Hz)
1792 G06
Voltage Noise vs Frequency
100
VS = ±15V
TA = 25°C
10
1/f CORNER
30Hz
1
1 10 100 1k 10k
FREQUENCY (Hz)
1792 G02
Input Bias and Offset Current
vs Chip Temperature
100
VS = ±15V
30
10
3
1
IB
0.3
IOS
0.1
0.03
0.01
– 75 – 50 – 25 0 25 50 75 100 125
TEMPERATURE (°C)
1792 G04
Power Supply Rejection Ratio
vs Frequency
120
TA = 25°C
100
80
+PSRR
60
–PSRR
40
20
0
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
1792 G07
Voltage Noise
vs Chip Temperature
10
VS = ±15V
9
8
7
6
5
4
3
2
1
0
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
1792 G03
Common Mode Limit
vs Temperature
V+ 0
– 0.5
–1.0 V + = 5V TO 20V
– 1.5
– 2.0
4.0
3.5
3.0
2.5
V –+ 2.0
– 60
V – = – 5V TO – 20V
–20 20
60 100
TEMPERATURE (°C)
140
1792 G05
Voltage Gain vs Frequency
180
160
140
120
100
80
60
40
20
0
– 20
0.01
1 100 10k 1M 100M
FREQUENCY (Hz)
1792 G08
5
5 Page 
TYPICAL APPLICATI S
Low Noise Light Sensor with DC Servo
C1
2pF
R1
1M
2–
D2
1N914
CD
2N3904
6
LT1792
3 + C2
0.022µF
D1
1N914
R3
1k
V+
72
6
LT1792
3
R2
100k
HAMAMATSU
S1336-5BK
R5
1k
V–
R4 4
1k
R2C2 > C1R1
V–
CD = PARASITIC PHOTODIODE CAPACITANCE
VO = 100mV/µWATT FOR 200nm WAVE LENGTH
330mV/µWATT FOR 633nm WAVE LENGTH
1792 TA05
OUTPUT
LT1792
Paralleling Amplifiers to Reduce Voltage Noise
3+
An
6 1k
LT1792
2–
51Ω 1k
10k
3+
A2
6 1k
15V
2– 7
LT1792
2–
51Ω 1k
LT1792
3+
4
6
OUTPUT
15V
–15V
3+ 7
A1 6 1k
LT1792
2– 4
1. ASSUME VOLTAGE NOISE OF LT1792 AND 51Ω SOURCE RESISTOR = 4.3nV/√Hz
51Ω
–15V
1k
2. GAIN WITH n LT1792s IN PARALLEL = n × 200
3. OUTPUT NOISE = √n × 200 × 4.3nV/√Hz
4.
INPUT
REFERRED
NOISE
=
OUTPUT NOISE
n × 200
=
4.3
√n
nV/√Hz
5. NOISE CURRENT AT INPUT INCREASES √n TIMES
1792 TA04
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1792.PDF ] | |
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