MAX3643
155Mbps to 2.5Gbps Burst-Mode Laser Driver
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 3.0V to 3.6V, TA = -40°C to +85°C. Typical values are at VCC = 3.3V, TA = +25°C, IBIAS = 20mA, IMOD = 30mA, unless other-
wise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Sampling Error
Final value measured after 10μs
(MDOUT - MDIN), burst width > 576ns
BANDGAP VOLTAGE REFERENCE SPECIFICATIONS
VREF Output
RL > 10k, CL < 50pF
MODULATION/BIAS CURRENT DISABLE
Enable Time
5mA < IBIAS, 10mA < IMOD (Note 10)
Disable Time
(Notes 2, 11)
RIMAX Range
Current Limit (Tested with IBIAS
= IMOD)
IBIAS+IMOD
RIMAX = 3k
RIMAX = 5k
RIMAX = 10k
OPTICAL EVALUATION
155.52Mbps
Eye Margin (Note 12)
622.08Mbps
1.24416Gbps
2.48832Gbps
MIN TYP MAX UNITS
3
±14
mV
1.175 1.235 1.295
V
5.5
μs
375
ns
3
15
k
155
100
150
mA
50
75
49
45
%
38
18
Note 1: Electrical specifications are production tested at TA = +25°C. Specifications over the entire operating temperature range
are guaranteed by design and characterization. Typical specifications are at TA = +25°C, 3.3V.
Note 2: For 10mA ≤ IMOD ≤ 85mA and 4mA ≤ IBIAS ≤ 70mA.
Note 3: Deterministic jitter measured with a continuous pattern of 27-1 PRBS, 80 ones, 27-1 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 VCC = 3.3V, TA = +25°C.
Note 14: Gain linearity = (Gainmax – Gainmin), Gainavg = Gainmax + Gainmin
Gainavg
2
Note 15: Gain matching = Gainmod / Gainbias − Gainmodnom / Gainbiasnom , nominal at VCC = 3.3V, TA = +25°C.
Gainmodnom / Gainbiasnom
4
Maxim Integrated