Datasheet

MAX3869
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.14V to +5.5V, load as shown in Figure 2, T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V, I
MOD
= 30mA, T
A
= +25°C.)
(Note 7)
Note 1: Dice are tested at T
A
= +25°C only.
Note 2: Tested at R
MODSET
= 2.49kΩ, R
BIASMAX
= 1.69kΩ, excluding I
BIAS
and I
MOD
.
Note 3: Voltage on BIAS pin is (V
CC
- 1.6V).
Note 4: Both the bias and modulation currents will be switched off if any of the current set pins are grounded.
Note 5: Accuracy refers to part-to-part variation.
Note 6: Assuming that the laser to monitor-diode transfer function does not change with temperature. Guaranteed by design and
characterization.
Note 7: AC characteristics are guaranteed by design and characterization.
Note 8: Measured with 622Mbps 0-1 pattern, LATCH = high.
Note 9: PWD = (wider pulse - narrower pulse) / 2.
Note 10: See Typical Operating Characteristics for worst-case distribution.
I
MOD
= 5mA
300
78
LATCH = high, Figure 3
LATCH = high, Figure 3
20% to 80% (Note 8)
ps
69
(Note 8)
20% to 80% (Note 8)
ENABLE = low (Note 4)
I
MOD
= 60mA
(Note 5)
Jitter BW = 12kHz to 20MHz, 0-1 pattern
(Notes 8, 9)
CONDITIONS
t
R
Output Rise-Time ps
ps
p-p
720
Jitter Generation
ps
14 50
PWDPulse-Width Distortion
mA
560
I
MOD
Modulation-Current Range
ps
100
t
H
ps
100
t
SU
Input Latch Setup Time
Input Latch Hold Time
bits
80
Maximum Consecutive Identical
Digits
ns
250
Enable and Start-Up Delay
%
±15
Output Aberrations
79
t
F
Output Fall- Time
µA
200
I
MOD-OFF
Modulation-Off Current
ppm/°C
-480 -8 480
Modulation-Current Stability
%
-15 15
Modulation-Current Absolute
Accuracy
87 (Note 10)
UNITSMIN TYP MAXSYMBOLPARAMETER
MAX3869EHJ
MAX3869E/D
MAX3869EHJ
MAX3869E/D
DATA+
DATA-
(DATA+) - (DATA-)
I
OUT
+
100mV MIN
800mV MAX
200mVp-p MIN
1600mVp-p MAX
I
MOD
Figure 1. Required Input Signal and Output Polarity