Datasheet

MAX3740A
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (V
CC
) ..............................................-0.5V to 6.0V
Voltage at TX_DISABLE, IN+, IN-, FAULT,
SQUELCH, TC1, TC2, MODSET, PEAKSET, BIASSET,
BIAS, BIASMON, COMP, MD, REF,
PWRMON ...............................................-0.5V to (V
CC
+ 0.5V)
Voltage at OUT+, OUT-.........................(V
CC
- 2V) to (V
CC
+ 2V)
Current into FAULT ............................................ -1mA to +25mA
Current into OUT+, OUT- ....................................................60mA
Continuous Power Dissipation (T
A
= +85°C)
24-Lead Thin QFN
(derate 20.8mW/°C above +85°C).................................1354mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(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
I
MOD
= 2mA
P-P
32
SQUELCH set low,
TX_DISABLE set low,
peaking is not used
(Note 1)
I
MOD
= 15mA
P-P
55 68
Additional current when peaking is used
(Note 2)
15 20
I
CC
Additional current when SQUELCH is high 5 10
Supply Current
I
CC-SHDN
Total current when TX_DISABLE is high 3.9 5
mA
FAULT OUTPUT
Output High Voltage V
OH
R
LOAD
= 10kΩ to 2.97V 2.4 V
Output Low Voltage V
OL
R
LOAD
= 4.7kΩ to 3.63V 0.4 V
TX_DISABLE INPUT
Input Impedance 4.7 10.0 kΩ
Input High Voltage V
IH
2.0 V
Input Low Voltage V
IL
0.8 V
Power-Down Time
The time for I
CC
to reach I
CC-SHDN
when
TX_DISABLE transitions high
50 µs
SQUELCH
Squelch Threshold 25 85 mV
P-P
Squelch Hysteresis 10 mV
P-P
Time to Squelch Data (Note 3) 0.02 5.00 µs
Time to Resume from Squelch (Note 3) 0.02 5.00 µs
BIAS GENERATOR (Note 4)
Minimum 1
Bias Current I
BIAS
Maximum 15
mA
5mA ≤ I
BIAS
≤ 15mA -8 +8
Accuracy of Programmed Bias
Current
ΔBIAS
1mA ≤ I
BIAS
≤ 5mA -12 +12
%