TZA3031U Philips Semiconductors, TZA3031U Datasheet - Page 14

• Manufacturer Part Number: TZA3031U
• Description: SDH/SONET STM1/OC3 laser drivers
• Manufacturer: Philips Semiconductors

Philips Semiconductors
APPLICATION INFORMATION
1999 Aug 24
handbook, full pagewidth
SDH/SONET STM1/OC3 laser drivers
(1) C7 is required to meet the minimum capacitance value on pin MONIN (optional, see Section “Automatic laser control”).
(2) C8 enhances modulation control loop time constant (optional).
(3) C9 enhances bias control loop time constant (optional).
(4) R1 and R2 are used for optical ZERO and ONE reference currents setting (see Section “Automatic laser control”).
(5) R3 and R4 are used for minimum and maximum bias currents setting (see Section “Bias alarm for TZA3031AHL”).
(6) Z1 is required for balancing the output stage (see Section “Power supply connections”).
V CC
Fig.6 Application diagram showing the TZA3031AHL configured for 155 Mbits/s (STM1/OC3).
C7
(1)
C1
1 F
C3
1 F
C5
1 F
C8
C9
C10
L1
L2
L3
(2)
(3)
22 nF
MONIN
TZERO
TONE
BGAP
C2
22 nF
C4
22 nF
C6
22 nF
2
4
5
6
7
V CC(G)
1, 3, 8, 9, 11,
14, 16, 17,
24, 25, 32
11
10
V CC(B)
GND
19, 20,
27, 30
4
TZA3031AHL
MPD
V CC(R)
15
BIAS
L1
R5
18
31
(CML/PECL compatible)
ALS
13
normal mode
LA
14
data inputs
29
DINQ
12
28
LAQ
Z1
DIN
(6)
laser
26
23
22
21
18
TZA3031AHL; TZA3031BHL;
ALARM
ZERO
ONE
ALARMLO
ALARMHI
C11
R1
(4)
R2
(4)
Preliminary specification
R3
(5)
TZA3031U
MBK848
R4
(5)