Pin Description
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, load as shown in Figure 2, T
A
= +25°C, unless otherwise noted.)
NAME FUNCTION
1, 42, 45 GND2 Ground for internal reference
2, 7, 12, 15, 16, GND1 Ground for digital circuits
PIN
3, 6, 8, 11, 18 V
CC
1 Power supply for digital circuits
4 DATA+ Positive PECL Data Input
13 LATCH TTL/CMOS Latch Input. High for latched data, low for direct data.
10 CLK- Negative PECL Clock Input. Leave unconnected if latch function is not used.
9 CLK+ Positive PECL Clock Input. Connect to V
CC
if latch function is not used.
5 DATA- Negative PECL Data Input
22 APCFILT Connect a capacitor (C
APCFILT
= 0.1µF) from this pad to ground to filter the APC noise.
21, 26, 28, 31, 39,
41, 43
N.C. No Connection. Leave unconnected.
19
FAIL
TTL/CMOS output. Indicates APC failure when low.
17 SLWSTRT
A capacitor from this pad to ground delays the turn-on time of laser bias and modulation
currents.
14 ENABLE
TTL/CMOS Enable Input. High for normal operation, low to disable laser bias and modulation
currents.
20, 23, 33 GND4 Ground for output circuitry
24, 27, 32 V
CC
4 Power Supply for output circuitry
