MAX3656(2010) Просмотр технического описания (PDF) - Maxim Integrated

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MAX3656
(Rev.:2010)

155Mbps to 2.5Gbps Burst-Mode Laser Driver

Maxim Integrated 

155Mbps to 2.5Gbps Burst-Mode

Laser Driver

ELECTRICAL CHARACTERISTICS (continued)

(Typical values are at VCC = +3.3V, IBIAS = 20mA, IMOD = 25mA, extinction ratio = 10dB, and TA = +25°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

BURST-MODE SPECIFICATIONS

Burst Enable Delay

APC closed loop (Notes 10, 11, 13)

2.3

ns

Burst Disable Delay

APC closed loop (Notes 10, 12, 13)

2.0

ns

155Mbps

2881

Burst On-Time (Note 13)

tB-ON 622Mbps

720

ns

1.25Gbps, 2.5Gbps

576

155Mbps

192

Burst Off-Time (Note 13)

tB-OFF 622Mbps

1.25Gbps, 2.5Gbps

96

ns

96

OPTICAL EVALUATION

Optical Eye Diagram Mask

Margin

ExceLight

SLT2886-LR

laser diode

(or equivalent)

155.52Mbps

622.08Mbps

1.24416Gbps

2.48832Gbps

45

40

%

31

24

Note 1: Excludes IBIAS and IMOD. Maximum value is specified at IMOD = 85mA, IBIAS = 70mA, and IMD = 1.5mA.

Note 2: For safety purposes, both the bias and modulation currents are switched off if any of the current set pins (BIASMAX, MODSET)

are grounded.

Note 3: Accuracy refers to part-to-part variation.

Note 4: APC loop initialization definitions:

Note 5:

Note 6:

Note 7:

IBIAS Error: IBIAS - IBIASSET, where IBIAS = the actual bias current and IBIASSET = the level of bias current set by the RAPCSET

resistor.

Initialization Case 1: Continuous Mode Power-Up. In this case, EN = low, BEN = high, and then VCC is ramped up from

0V to ≥3.0V.

Initialization Case 2: Chip-Enable Reset. In this case, 3.0V ≤ VCC ≤ 3.6V, BEN = high, and then EN changes from high to low.

Initialization Case 3: Burst-Mode Startup. In this case, 3.0V ≤ VCC ≤ 3.6V, EN = low, and then BEN changes from low to high.

IBIAS error is less than 3.8mA (for an extinction ratio of 10dB and IMD = 1500µA) within 12µs from the time that VCC ≥ 3.0V.

IBIAS error is less than 3.8mA (for an extinction ratio of 10dB and IMD = 1500µA) within 2.1µs (typ) from the time that EN < 0.8V.

IBIAS error must be less than 3.8mA (for an extinction ratio of 10dB and IMD = 1500µA) at or before the end of the third

burst following the transition of BEN from low to high. For the shortest burst on- and off-time (576ns and 96ns), this trans-

lates to 1.92µs from when BEN toggles from low to high for the first time after startup.

Note 8: Rise and fall times are measured as 20% to 80% of the output amplitude with a repeating 0000011111.

Note 9: Deterministic jitter is measured with a continuous data pattern (no bursting) of 27 - 1 PRBS + 80 consecutive ones + 27 - 1

PRBS + 80 consecutive zeros.

Note 10: Measured electrically with a resistive load matched to the laser driver output.

Note 11: Enable delay is measured between (1) the time at which the rising edge of the differential burst enable input signal reach-

es the midpoint of the voltage swing, and (2) the time at which the combined output currents (bias and modulation) reach

90% of the final level set by RAPCSET, RBIASMAX, and RMODSET (after all transients such as overshoot, ringing, etc., have

settled to within 10% of their final values). See Figure 1. Measurement done for 10mA ≤ IMOD ≤ 85mA and 4mA ≤ IBIAS ≤

70mA.

Note 12: Disable delay is measured between (1) the time at which the falling edge of the differential burst enable input signal reaches

the midpoint of the voltage swing, and (2) the time at which the combined output currents (bias and modulation) fall below

10% of the bias on current (after transients have settled). See Figure 1. Measurement done for 10mA ≤ IMOD ≤ 85mA and

4mA ≤ IBIAS ≤ 70mA.

Note 13: Guaranteed by design and characterization.

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