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PDF LT1793 Data sheet ( Hoja de datos )
| Número de pieza | LT1793 | |
| Descripción | Low Noise/ Picoampere Bias Current/ JFET Input Op Amp | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Input Bias Current, Warmed Up: 10pA Max
s 100% Tested Low Voltage Noise: 8nV/√Hz Max
s A Grade 100% Temperature Tested
s Offset Voltage Over Temp: 1mV Max
s Input Resistance: 1013Ω
s Very Low Input Capacitance: 1.5pF
s Voltage Gain: 1 Million Min
s Gain-Bandwidth Product: 4.2MHz 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
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1793
Low Noise,
Picoampere Bias Current,
JFET Input Op Amp
DESCRIPTIO
The LT®1793 achieves a new standard of excellence in
noise performance for a JFET op amp. For the first time low
voltage noise (6nV/√Hz) is simultaneously offered with
extremely low current noise (0.8fA/√Hz), providing the
lowest total noise for high impedance transducer applica-
tions. Unlike most JFET op amps, the very low input bias
current (3pA typ) is maintained over the entire common
mode range which results in an extremely high input resis-
tance (1013Ω). When combined with a very low input ca-
pacitance (1.5pF) an extremely high input impedance
results, making the LT1793 the first choice for amplifying
low level signals from high impedance transducers. The
low input capacitance also assures high gain linearity when
buffering AC signals from high impedance transducers.
The LT1793 is unconditionally stable for gains of 1 or more,
even with 1000pF capacitive loads. Other key features are
250µV VOS and a voltage gain over 4 million. Each indi-
vidual amplifier is 100% tested for voltage noise, slew rate
(3.4V/µs) and gain-bandwidth product (4.2MHz).
Specifications at ±5V supply operation are also provided.
For an even lower voltage noise please see the LT1792 data
sheet.
TYPICAL APPLICATIO
Low Noise Light Sensor with DC Servo
C1
2pF
D2
1N914
CD
2N3904
V+
2– 7
LT1793
3+
4
V–
D1
1N914
R3
1k
6
R1
1M
C2 0.022µF
V + R2
100k
LT1097
HAMAMATSU
S1336-5BK
(908) 231-0960
R5
10k
V–
R4
1k
R2C2 > C1R1
V–
1793 TA01
CD = PARASITIC PHOTODIODE CAPACITANCE
VOUT = 100mV/µWATT FOR 200nm WAVE LENGTH
330mV/µWATT FOR 633nm WAVE LENGTH
VOUT
1kHz Output Voltage Noise
Density vs Source Resistance
10k
–
1k +
RSOURCE
VN
100
10 VN
SOURCE
RESISTANCE
ONLY
TA = 25°C
VS = ±15V
1
100 1k 10k 100k 1M 10M 100M 1G
SOURCE RESISTANCE (Ω)
VN = √(VOP AMP)2 + 4kTRS + 2qIBRS2
1793 TA02
1
1 page  
LT1793
TYPICAL PERFOR A CE CHARACTERISTICS
0.1Hz to 10Hz Voltage Noise
1kHz Input Noise Voltage
Distribution
50
TA = 25°C
VS = ±15V
40 510 OP AMPS TESTED
Voltage Noise vs Frequency
100
TA = 25°C
VS = ±15V
30
10
20
1/f CORNER
30Hz
10
0 2 4 6 8 10
TIME (SEC)
1793 G01
Voltage Noise
vs Chip Temperature
10
VS = ±15V
9
8
7
6
5
4
3
2
–75 –50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
1793 G04
Power Supply Rejection Ratio
vs Frequency
120
TA = 25°C
100
+PSRR
80
–PSRR
60
40
20
0
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
1793 G07
0
4.2 4.6 5.0 5.4 5.8 6.2 6.6 7.0 7.4 7.8 8.2
INPUT VOLTAGE NOISE (nV/√Hz)
1793 G02
1
1 10 100 1k 10k
FREQUENCY (Hz)
1793 G03
Common Mode Limit
vs Temperature
V+ 0
–0.5
V+ = 5V TO 20V
–1.0
–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
1793 G05
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)
1793 G06
Voltage Gain vs Frequency
180
TA = 25°C
160 VS = ±15V
140 CL = 10pF
120
100
80
60
40
20
0
– 20
0.01
1 100 10k 1M 100M
FREQUENCY (Hz)
1793 G08
Gain and Phase Shift
vs Frequency
50
40
TA = 25°C
VS = ±15V
CL = 10pF
80
100
30 120
PHASE
20 140
10
GAIN
0
160
180
– 10
0.1
1 10
FREQUENCY (MHz)
200
100
1793 G09
5
5 Page 
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
LT1793
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
8 765
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
1
0°– 8° TYP
0.053 – 0.069
(1.346 – 1.752)
2
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
34
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
SO8 0996
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 representa-
tion 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 LT1793.PDF ] | |
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