Datasheet

155Mbps to 2.5Gbps Burst-Mode Laser Driver
4 Maxim Integrated
MAX3643
Note 1: Electrical specifications are production tested at T
A
= +25°C. Specifications over the entire operating temperature range
are guaranteed by design and characterization. Typical specifications are at T
A
= +25°C, 3.3V.
Note 2: For 10mA ≤ I
MOD
≤ 85mA and 4mA ≤ I
BIAS
≤ 70mA.
Note 3: Deterministic jitter measured with a continuous pattern of 2
7
-1 PRBS, 80 ones, 2
7
-1 PRBS, 80 zeros at 1.25Gbps, and both
LVPECL inputs terminated by the network shown in Figure 3.
Note 4: Random jitter, rise time, fall time measured with 0000011111 pattern at 1.25Gbps.
Note 5: Voltage difference between VMSET and MODSET or VBSET and BIASSET excluding IR drops. The maximum operating
voltage at VMSET or VBSET must be less than 1.4V for proper operation.
Note 6: Turn-on/-off time is when the BEN+/BEN- LVPECL inputs are used to control modulation and bias currents.
Note 7: Burst-enable delay is measured between the time at which the rising edge of the differential burst-enable input reaches the
midpoint, and the time at which the combined output currents (bias plus modulation) reach 90% of their final level.
Note 8: Burst-disable delay is measured between the time at which the falling edge of the differential burst-enable input reaches the
midpoint, and the time at which the combined output currents (bias plus modulation) fall below 10% of the bias-on current.
Note 9: Droop measured with sample/hold output load of 10MΩ.
Note 10: Enable delay is measured between the time at which the falling edge of the EN input reaches ≤ 0.8V, and the time at which
the combined output currents (bias plus modulation) reach 90% of their final level.
Note 11: Disable delay is measured between the time at which the rising edge of the EN input reaches ≥ 2V, and the time at which
the combined output currents (bias plus modulation) fall below 10% of the bias-on current.
Note 12: Excelight SLT2886-LR laser.
Note 13: Current gain stability = [(Gain – nominal Gain) / nominal Gain], nominal Gain at V
CC
= 3.3V, T
A
= +25°C.
Note 14: Gain linearity = (Gainmax – Gainmin), Gainavg = Gainmax + Gainmin
Gainavg 2
Note 15: Gain matching = , nominal at V
CC
= 3.3V, T
A
= +25°C.
mod / mod /
mod /
Gain Gainbias Gain nom Gainbiasnom
Gain nom Gainbiasnom
−
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.0V to 3.6V, T
A
= -40°C to +85°C. Typical values are at V
CC
= 3.3V, T
A
= +25°C, I
BIAS
= 20mA, I
MOD
= 30mA, unless other-
wise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Sampling Error
Final value measured after 10μs
(MDOUT - MDIN), burst width > 576ns
3 ±14 mV
BANDGAP VOLTAGE REFERENCE SPECIFICATIONS
VREF Output R
L
> 10k, C
L
< 50pF 1.175 1.235 1.295 V
MODULATION/BIAS CURRENT DISABLE
Enable Time 5mA < I
BIAS
, 10mA < I
MOD
(Note 10) 5.5 μs
Disable Time (Notes 2, 11) 375 ns
R
IMAX
Range 3 15 k
R
IMAX
= 3k 155
R
IMAX
= 5k 100 150
Current Limit (Tested with I
BIAS
= I
MOD
)
I
BIAS
+I
MOD
R
IMAX
= 10k 50 75
mA
OPTICAL EVALUATION
155.52Mbps 49
622.08Mbps 45
1.24416Gbps 38
Eye Margin (Note 12)
2.48832Gbps 18
%