Datasheet

MAX3740A
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.97V to +3.63V, T
A
= -40°C to +85°C. Typical values are at V
CC
= +3.3V, TC1 and TC2 are shorted, PEAKSET open, T
A
=
+25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Bias Current During Fault I
BIAS_OFF
Current out of the BIAS pin 1.5 10 µA
1mA < I
BIAS
< 3mA 0.0875 0.105 0.1375
BIASMON Gain
3mA ≤ I
BIAS
≤ 15mA 0.085 0.105 0.125
mA/mA
BIASMON Stability (Notes 5,6) -10 +10 %
AUTOMATIC POWER CONTROL (APC)
MD Nominal Voltage V
MD
APC loop is closed 1
V
REF
-
0.16
2V
Voltage at REF V
REF
1.2 1.8 2.2 V
MD Voltage During Fault 0V
MD Input Current Normal operation (FAULT = low) -2 0.7 +2 µA
APC Time Constant C
COMP
= 0.047µF (Note 6) 5 20 µs
PWRMON Nominal Gain V
PWRMON
/ (V
REF
- V
MD
) 1.85 2.15 2.45 V/V
LASER MODULATOR (Note 7)
Minimum 250
Data Input Voltage Swing V
ID
Maximum 2200
mV
P
-
P
Single-ended resistance at OUT+ 80 105
Output Resistance
Single-ended resistance at OUT- 72 100
Ω
Minimum 2
Modulation Current I
MOD
Maximum 15
mA
P
-
P
Minimum Peaking Current Range 0.2 mA
Maximum Peaking Current Range 2mA
Peaking Current Duration 80 ps
Tolerance of Programmed
Modulation Current
TC1 is shorted to TC2 -10 +10 %
Minimum Programmable
Temperature Coefficient
0 ppm/°C
Maximum Programmable
Temperature Coefficient
Temperature range 0°C to +70°C +5000 ppm/°C
Modulation Transition Time t
R
, t
F
5mA ≤ I
MOD
≤ 15mA, 20% to 80% (Note 6) 65 95 ps
Deterministic Jitter DJ 5mA ≤ I
MOD
≤ 15mA, 3.2Gbps (Notes 6, 8) 12 20 ps
P-P
Random Jitter RJ (Note 6) 1.3 4 ps
RMS
Laser Modulation During Fault or
while Squelch is Active
I
MOD_OFF
15 50 µA
P-P
Input Resistance Differential resistance 85 100 115 Ω
Input Bias Voltage V
IN
V
CC
-
0.3
V