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MAX3646

155Mbps to 622Mbps SFF/SFP Laser Driver with Extinction Ratio Control

Maxim Integrated 

155Mbps to 622Mbps SFF/SFP

Laser Driver with Extinction Ratio Control

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +2.97V to +3.63V, TA = -40°C to +85°C. Typical values are at VCC = +3.3V, IBIAS = 60mA, IMOD = 60mA, TA = +25°C, unless

otherwise noted.) (Notes 1, 2)

PARAMETER

SYMBOL

CONDITIONS

AUTOMATIC POWER AND EXTINCTION RATIO CONTROLS

MIN TYP MAX UNITS

Monitor-Diode Input Current

Range

IMD Average current into the MD pin

18

1500

µA

MD Pin Voltage

MD Current Monitor Ratio

APC Loop Time Constant

APC Setting Stability

APC Setting Accuracy

IMOD Compensation-Setting

Range by Bias

IMD / IPC_MON

CAPC_FILT = 0.01µF, ΔIMD / ΔIBIAS = 1/70

(Note 6)

TA = +25°C

K

K = ΔIMOD / ΔIBIAS

1.4

V

0.85 0.93 1.15 mA/mA

3.3

µs

±100 ±480 ppm/°C

±15

%

0

1.5 mA/mA

IMOD Compensation-Setting

Range by Temperature

TC TC = ΔIMOD / ΔT (Note 6)

0

1.0 mA/°C

Threshold-Setting Range for

Temperature Compensation

TTH (Note 6)

+10

+60

°C

LASER SAFETY AND CONTROL

Bias and Modulation Turn-Off

Delay

CAPC_FILT = 0.01µF, ΔIMD / ΔIBIAS = 1/80

(Note 6)

5

µs

Bias and Modulation Turn-On

Delay

CAPC_FILT = 0.01µF, ΔIMD / ΔIBIAS = 1/80

(Note 6)

600

µs

Threshold Voltage at Monitor Pins

INTERFACE SIGNALS

VREF Figure 5

1.14 1.3 1.39

V

TX_DISABLE Input High

TX_DISABLE Input Low

TX_DISABLE Input Current

TX_FAULT Output Low

VHI

VLO RPULL = 45kΩ (typical)

VHI = VCC

VLO = GND

Sinking 1mA, open collector

2.0

V

0.8

V

15

µA

-70 -140

0.4

V

Shutdown Output High

Shutdown Output Low

Sourcing 100µA

Sinking 100µA

VCC - 0.4

V

0.4

V

Note 1: AC characterization is performed using the circuit in Figure 2 using a PRBS 223 - 1 or equivalent pattern.

Note 2: Specifications at -40°C are guaranteed by design and characterization.

Note 3: Excluding IBIAS and IMOD. Input data is AC-coupled. TX_FAULT open, SHUTDOWN open.

Note 4: Power-supply noise rejection (PSNR) = 20log10(Vnoise (on VCC) / ΔVOUT). VOUT is the voltage across the 15Ω load when IN+

is high.

Note 5: The minimum required voltage at the OUT+ and OUT- pins is +0.75V.

Note 6: Guaranteed by design and characterization.

Note 7: Tested with 00001111 pattern at 622Mbps.

Note 8: DJ includes pulse-width distortion (PWD).

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