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MAX3643
(Rev.:2005)

Burst-Mode Laser Driver

Maxim Integrated 

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

otherwise noted.) (Note 1)

PARAMETER

SYMBOL

SAMPLE/HOLD SPECIFICATIONS

CONDITIONS

MIN TYP MAX UNITS

MDIN Voltage Range

0.05

2.56

V

MDOUT Settling

Relative to final value at 3µs, CL < 20pF

±1

mV

Sample/Hold Droop

After 100µs (Note 9)

±2.56 mV

Sampling Error

Final value measured after 10µs

(MDOUT - MDIN), burst width > 576ns

3

±14

mV

BANDGAP VOLTAGE REFERENCE SPECIFICATIONS

VREF Output

RL > 10kΩ, 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 = 3kΩ

RIMAX = 5kΩ

RIMAX = 10kΩ

OPTICAL EVALUATION

1.175 1.235 1.295

V

5.5

µs

375

ns

3

15

kΩ

155

100

150

mA

50

75

Eye Margin

1.25Gbps (Note 12)

33

%

Note 1: DC parameters are production tested at TA = +25°C, guaranteed by design and characterization at TA = -40°C.

AC parameters are guaranteed by design and characterization.

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 SXT5731-Q 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

2

Note 15: Gain matching = Gainmod / Gainbias − Gainmodnom / Gainbiasnom nominal at VCC = 3.3V, TA = +25°C.

Gainmodnom / Gainbiasnom

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