Data Sheet
January 2000
1345-Type Receiver with
Clock Recovery and Data Retiming
Characteristics (continued)
Table 2. Optical Characteristics
Data Rates
Mbits/s
Parameter
Symbol
Min
Typ
Max*
Unit
Measured Average Sensitivity:*, †
OC-3
OC-12
Maximum Input Power‡
PRL
PRL
OC-3/STM-1
OC-12/STM-4
—
—
38
–32.5
–36
–30
dBm
dBm
PMAX
OC-3/STM-1
OC-12/STM-4
0
–6
2
–4
—
—
dBm
dBm
Link Status Flag Threshold:‡
Decreasing Light Input
LSTD
LSTI
OC-3/STM-1
OC-12/STM-4
OC-3/STM-1
OC-12/STM-4
–50
–50
–50
–50
–41
–38.8
–38
–37.5
–32.5
–37.0
–32.0
dBm
dBm
dBm
dBm
Decreasing Light Input
–35
Flag Hysteresis
Flag Response Time
Detector Responsivity
–10
HYS
tFLAG
R
155/622
155/622
155/622
0.5
3
3
6
dB
µs
—
100
1.2
0.7
0.8
A/W
23
*
For a 1 x 10
BER. Measured with a 2 – 1 pseudorandom word optical input having a 50% average duty cycle.
†
Whenever the flag output is deasserted (logic low), the DATA and CLOCK outputs are silenced. See the Flag Output section on
page 2 for the DATA and CLOCK output signal levels.
‡
Power supply noise in excess of 50 mVp-p may degrade the performance of the receiver. See User Interface section for recom-
mended power supply filtering.
50%
DATAOUT
50%
CLOCKOUT
TCDA
1-725(C)
Figure 4. Clock/Data Alignment
7
Agere Systems Inc.
AGERE [ AGERE SYSTEMS ]
