LT1792C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1792C' PDF : 12 Pages View PDF
TYPICAL APPLICATI S
Low Noise Light Sensor with DC Servo
C1
2pF
R1
1M
2–
D2
1N914
6
LT1792
3+
C2
0.022µF
CD
2N3904
V+
R2
D1
R3
7
2
100k
1N914 1k
6
LT1792
3
HAMAMATSU
S1336-5BK
R5
1k
V–
R4
4
1k
V–
R2C2 > C1R1
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
6
LT1792
3+
4
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.
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