Datasheet

+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.14V to +5.5V, load as shown in Figure 2, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= +3.3V,
T
A
= +25°C.) (Note 5)
Maxim Integrated 3
MAX3669
Note 1: Tested with R
MODSET
= 5.11kΩ (I
MOD
≈ 38mA), R
BIASMAX
= 4.56kΩ (I
BIAS
≈ 52mA), excluding I
BIAS
and I
MOD
.
Note 2: Both the bias and modulation currents will be disabled if any of the current set pins are shorted to ground.
Note 3: Guaranteed by design and characterization. This assumes that the laser to monitor diode transfer function does not change
with temperature.
Note 4: See the
Typical Operating Characteristics for worst-case distributions.
Note 5: AC characteristics are guaranteed by design and characterization.
Note 6: Total I
MOD
out of OUT+. See the Design Procedure section for information regarding current delivered to the laser.
Note 7: Input signal is a 622Mbps, 2
13
- 1 PRBS with eighty inserted 0s.
Note 8: Input signal is a 622Mbps, 11110000 pattern.
Note 9: PWD = (wider pulse – narrower pulse) / 2.
DATA+
DATA-
(DATA+) - (DATA-)
I
OUT
+
100mV MIN
800mV MAX
200mV
P-P
MIN
1600mV
P-P
MAX
I
MOD
Figure 1. Required Input Signal and Output Polarity
V
CC
15Ω
10Ω
1μF
1μF
12.4Ω
20Ω
OUT-
OUT+
BIAS
20Ω
50Ω
OSCILLOSCOPE
MAX3669
V
CC
I
OUT+
Figure 2. Output Termination for Characterization
10 135I
MOD
= 75mA
Maximum Consecutive Identical
Digits at 622Mbps
CID 80 Bits
I
MOD
= 5mA
I
MOD
= 75mA
Jitter Generation (Peak-to-Peak) 100 ps(Note 7)
205I
MOD
= 5mA (Note 4)
I
MOD
= 5mA
(Notes 8, 9)
PARAMETER SYMBOL MIN TYP MAX UNITS
230 375
psOutput Rise/Fall Time t
R,
t
F
100 200
Modulation Current Absolute
Accuracy
-15 +15 %
Pulse-Width Distortion
(Peak-to-Peak)
70 155
ps
Enable/Start-Up Delay 250 ns
Modulation Current Stability
-620 -165 +620
ppm/°C
CONDITIONS
20% to 80%,
R
L
= 10Ω
||
20Ω load
Open loop
I
MOD
= 75mA
Modulation Current Range I
MOD
575mA(Note 6)
Modulation Off-Current 200 µAENABLE = low (Note 2)