M61880FP
4. Example of sample-and-hold type self-APC circuit
(Controlling two laser diodes)
100pF 36Ω
5V
10Ω
Vcc2
Digital
GND2
Digital
RO
NC
18
LD
17
PD DATA
15 14
ENB
13
2RM
12
1RM
11
20
19
16
M61880FP-1
TTL input
COMP
ISW
Charge/
discharge
control circuit
2.5V
Reference
voltage
IB
50k
5V
VCC
1.5V
1
2
3
4
5
6
7
8
9
10
LD1
RS
RB
150Ω
VB
Vref
Vr
CH
S/H
NC
Vcc1
Analog
GND1
Analog
1.5kΩ
0.047µF
Rvr1
PD
LD2
5V
100pF 36Ω
5V
Rm
10Ω
RO
19
Vcc2
Digital
GND2
Digital
NC
18
LD
17
PD DATA
15 14
ENB 2RM
1RM
11
20
16
13
12
M61880FP-2
TTL input
COMP
Charge/
ISW
discharge
control circuit
2.5V
Reference
voltage
IB
50k
1.5V
1
2
3
4
5
6
7
8
9
10
RS
GND1
Analog
RB
VB
Vref
Vr
CH
S/H
Vcc1 NC
Analog
1.5kΩ
150Ω
0.047µF
Rvr2
5V
Sample-and-Hold Timing
M61880FP-1
S/H input
HOLD
HOLD
M61880FP-2
S/H input
Start of data transfer
Sampling
Rev.1.0, Sep.19.2003, page 13 of 20
RENESAS [ RENESAS TECHNOLOGY CORP ]
