tza3047a NXP Semiconductors, tza3047a Datasheet - Page 20

• Manufacturer Part Number: tza3047a
• Description: 30 Mbits/s Up To 1.25 Gbits/s Laser Drivers
• Manufacturer: NXP Semiconductors

Philips Semiconductors
12.4
A simplified application using the TZA3047B with average loop control and a DC-coupled laser at 3.3 or 5 V laser voltage
is illustrated in Fig.9. The ER pin is short-circuited to ground for the average loop control. The average power level is
determined by the resistor R
the BIASIN input. The modulation current is determined by the MODIN input voltage which is generated by the resistor
R
2003 Jun 05
handbook, full pagewidth
MODIN
30 Mbits/s up to 1.25 Gbits/s laser drivers
TZA3047B with average loop control
and the 100 A source current of the MODIN pin.
3.3 V
3.3 V
ALRESET
V CCD
V CCA
DINQ
TEST
CINQ
GND
Fig.9 TZA3047B with DC-coupled laser and average loop control.
DIN
CIN
AVR
. The average loop controls the bias current and the BIASOUT output is connected to
1
2
3
4
5
6
7
8
9
10
32
11
31
30
TZA3047B
12
13
29
28
14
3.3 V or 5 V
15
27
20
26
16
19
18
17
25
24
23
22
21
20
BIAS
GND
LA
LA
LAQ
LAQ
GND
MDB315
TZA3047A; TZA3047B
laser with
monitor diode
Product specification