tza3047a NXP Semiconductors, tza3047a Datasheet - Page 18

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

I
Philips Semiconductors
12.2
A simplified application using the TZA3047A with dual-loop control and with an AC-coupled laser at 3.3 V laser voltage
is illustrated in Fig.7. The average power level and the extinction ratio are determined by the resistors R
The MODOUT and BIASOUT outputs are connected to the MODIN and the BIASIN inputs respectively. The alarm
threshold on the operating current is made temperature dependent with resistor R
MAXOP. This alarm detects the end of life of the laser.
The resistor R
2003 Jun 05
oper(alarm)
handbook, full pagewidth
30 Mbits/s up to 1.25 Gbits/s laser drivers
TZA3047A with dual-loop control
=
N
PWA
MAXOP
3.3 V
3.3 V
ALRESET
enables pulse width adjustment for optimizing the eye diagram.
V CCD
V CCA
DINQ
TEST
CINQ
GND
DIN
CIN
V
--------------------
R
MAXOP
MAXOP
Fig.7 TZA3047A with AC-coupled laser and dual-loop control.
1
2
3
4
5
6
7
8
9
–
32
10
TC
-------------------------------------------------------------- -
11
31
VTEMP
30
TZA3047A
12
R
VTEMP
13
29
T
28
14
j
–
25 C
15
27
3.3 V
16
26
18
19
18
17
25
24
23
22
21
20
BIAS
GND
LA
LA
LAQ
LAQ
GND
MDB317
VTEMP
TZA3047A; TZA3047B
connected between VTEMP and
laser with
monitor diode
Product specification
AVR
and R
ER
.