MAX3736
3.2Gbps, Low-Power, Compact,
SFP Laser Driver
6 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1, 4, 9,
12, 15
V
CC
+3.3V Supply Voltage. All pins must be connected to V
CC.
2 IN+ Noninverted Data Input
3 IN- Inverted Data Input
5 BIASSET
A current DAC, a voltage DAC, or a resistor, connected from this pin to ground, sets the desired bias
current for the laser (see the Programming the Laser Bias Current section).
6 MODSET
A current DAC, a voltage DAC, or a resistor, connected from this pin to ground, sets the desired bias
current for the laser (see the Programming the Laser Modulation Current section).
7 BC_MON
Bias Current Monitor Output. Current out of this pin develops a ground-referenced voltage across an
external resistor that is proportional to the bias current.
8 BIAS Laser Bias Current Output
10 OUT+ Noninverted Modulation Current Output. I
MOD
flows into this pin when input data is high.
11 OUT- Inverted Modulation Current Output. I
MOD
flows into this pin when input data is low.
13, 14 GND Ground
16 DIS
Transmitter Disable, TTL. Laser output is disabled when DIS is asserted high or left
unconnected. The laser output is enabled when this pin is asserted low.
— EP
Exposed Pad. Must be soldered to the circuit board ground for proper thermal and electrical
performance (see the Exposed-Pad Package section).
Typical Operating Characteristics (continued)
(Typical values are at V
CC
= 3.3V, I
BIAS
= 20mA, I
MOD
= 30mA, T
A
= +25°C, unless otherwise noted.)
DETERMINISTIC JITTER
vs. MODULATION CURRENT
MAX3736 toc10
I
MOD
(mA
P-P
)
DJ (ps
P-P
)
50403020
10
20
30
40
50
60
0
10 60
2.7Gbps
2
23
-1 PRBS
DIFFERENTIAL S
11
vs. FREQUENCY
MAX3736 toc11
FREQUENCY (GHz)
IS
11
I (dB)
8642
-25
-20
-15
-10
-5
0
-30
010
