Datasheet

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LOG102
10
SBOS211B
FIGURE 12. Technique for Using Full-Scale Reference Current such that V
OUT
Increases with Increasing Photodiode Current.
A
1
A
2
LOG102
Q
1
Q
2
A
3
R
2
R
3
R
2
5
10
3
7
4
R
3
C
C
V
LOGOUT
V
REF
I
REF
I
REF
=
I
MIN
to I
MAX
V
REF
R
1
V
OUT
= V
REF
– • LOG
( )
R
2
R
3
I
REF
I
PHOTO
I
1
I
2
14
1
I
PHOTO
A/D
R
1
V
MIN
to V
MAX
FIGURE 13. High Side Shunt for Avalanche Photodiode (APD) Measures 3 Decades of APD Current.
A
1
–5V
SO-14
9
LOG102
Q
1
2
Q
2
I
OUT
I
OUT
= 0.1 • I
SHUNT
10
1.2kΩ
Receiver
Irx = 1µA to 1mA
I to V
Converter
APD
10gbits/sec
1kΩ
C
C
A
2
A
3
V
OUT
= 2.5V to 0V
I
SHUNT
100µA
500
5kΩ 5kΩ
+15V to +60V
+5V
25kΩ
NOTE: (1) Available Q2 2002.
INA168
SOT23-5
REF3025
(1)
2.5V
+5V
1
1
14
6
54
7
3