MAX3735ESLASHD datasheet(4/18 Pages) MAXIM

4 / 18 page

2.7Gbps, Low-Power SFP Laser Drivers

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ELECTRICAL CHARACTERISTICS (continued)

(VCC = +2.97V to +3.63V, TA = -40°C to +85°C. Typical values at VCC = +3.3V, IBIAS = 20mA, IMOD = 30mA, TA= +25°C, unless

otherwise noted.) (Note 1)

Note 1: Specifications at -40°C are guaranteed by design and characterization. Dice are tested at TA = +25°C only.

Note 2:

Maximum value is specified at IMOD = 60mA, IBIAS = 100mA.

Note 3:

TX_FAULT is an open-collector output and must be pulled up with a 4.7k

Ω to 10kΩ resistor.

Note 4:

Guaranteed by design and characterization.

Note 5:

VCC turn-on time must be

≤ 0.8s, DC-coupled interface.

Note 6:

Gain stability is defined by the digital diagnostic document (SFF-8472, rev. 9.0) over temperature and supply variation.

Note 7:

Assuming that the laser diode to photodiode transfer function does not change with temperature.

Note 8:

Accuracy refers to part-to-part variation.

Note 9:

Deterministic jitter is measured using a 223 - 1 PRBS or equivalent pattern.

Note 10: Broadband noise is filtered through the network as shown in Figure 3. One capacitor,

C < 0.47µF, and one 0603 ferrite bead or inductor can be added (optional). This supply voltage filtering reduces the hot-

plugging inrush current. The supply noise must be < 100mVP-P up to 2MHz.

Note 11: CAPC values chosen as shown in Table 4 (MAX3735A).

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SAFETY FEATURES

Excessive Bias-Current

Comparator Threshold Range

TX_FAULT always occurs for VBC_MON

≥

1.38V, TX_FAULT never occurs for

VBC_MON

≤ 1.22V

1.22

1.30

1.39

Excessive MD-Current

Comparator Threshold Range

TX_FAULT always occurs for VPC_MON

≥

1.38V, TX_FAULT never occurs for

VPC_MON

≤ 1.22V

1.22

1.30

1.39

SFP TIMING REQUIREMENTS

TX_DISABLE Assert Time

t_off

Time from rising edge of TX_DISABLE to

IBIAS = IBIASOFF and IMOD = IMODOFF

(Note 4)

0.14

µs

CAPC = 2.7nF,

MAX3735 (Note 4)

1ms

TX_DISABLE Negate Time

t_on

Time from falling edge

of TX_DISABLE to

IBIAS and IMOD at 95%

of steady state when

TX_FAULT = 0 before

reset

MAX3735A

(Note 11)

600

µs

TX_DISABLE Negate Time

During FAULT Recovery

t_onFAULT

Time from falling edge of TX_DISABLE to

IBIAS and IMOD at 95% of steady state when

TX_FAULT = 1 before reset (Note 4)

200

TX_FAULT Reset Time or Power-

On Time

t_init

From power-on or negation of TX_FAULT

using TX_DISABLE (Note 4)

200

TX_FAULT Assert Time

t_fault

Time from fault to TX_FAULT on, CFAULT

≤

20pF, RFAULT = 4.7k

Ω (Note 4)

3.3

µs

TX_DISABLE to Reset

Time TX_DISABLE must be held high to

reset TX_FAULT (Note 4)

5µs

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