 English |
|
|
|
|
|
|
|
| LOG102 Datasheet, PDF (10/15 Pages) Texas Instruments – LOGARITHMIC AND LOG RATIO AMPLIFIER | |||
| |||
| ◁ |
IREF =
VREF
R1
IREF
R1
VREF
IPHOTO
IMIN to IMAX
I1
1
( ) VOUT = VREF â
R2 ⢠LOG
R3
IREF
IPHOTO
R2
R3
CC
VLOGOUT
5
3
Q1
Q2
A3
A2
A1
I2
14
LOG102
10
VMIN to VMAX
7
A/D
R2
4
R3
FIGURE 12. Technique for Using Full-Scale Reference Current Such that VOUT Increases with Increasing Photodiode Current.
+15V to +60V
500
ISHUNT
5kâ¦
5kâ¦
+5V
Irx = 1µA to 1mA
Receiver
APD
I to V
Converter
10gbits/sec
INA168
SOT23-5
2
1
IOUT
IOUT = 0.1 ⢠ISHUNT
+5V
6
1
Q1
Q2
100µA
25kâ¦
REF3025(1)
2.5V
A1
14
LOG102
SO-14
9
â5V
NOTE: (1) Available Q2 2002.
CC
1.2kâ¦
1kâ¦
5
A2
4
A3
7
VOUT = 2.5V to 0V
3
10
FIGURE 13. High Side Shunt for Avalanche Photodiode (APD) Measures 3-Decades of APD Current.
10
www.ti.com
LOG102
SBOS211A
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese