MAX3646(2004) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX3646
(Rev.:2004)

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

Maxim Integrated 

155Mbps to 622Mbps SFF/SFP

Laser Driver with Extinction Ratio Control

PIN

1

2, 5, 14,

17

3

4

6

7

8

9

10, 12

11

13

15

16

18

19

20

21

22

23

24

EP

Pin Description

NAME

MODTCOMP

FUNCTION

Modulation-Current Compensation from Temperature. A resistor at this pin sets the temperature

coefficient of the modulation current when above the threshold temperature. Leave open for zero

temperature compensation.

VCC

+3.3V Supply Voltage

IN+

IN-

TX_DISABLE

PC_MON

BC_MON

SHUTDOWN

GND

TX_FAULT

BIAS

OUT-

OUT+

MD

APCFILT1

APCFILT2

APCSET

MODSET

MODBCOMP

TH_TEMP

Exposed Pad

Noninverted Data Input

Inverted Data Input

Transmitter Disable, TTL. Laser output is disabled when TX_DISABLE is asserted high or left

unconnected. The laser output is enabled when this pin is asserted low.

Photodiode-Current Monitor Output. Current out of this pin develops a ground-referenced voltage

across an external resistor that is proportional to the monitor diode current.

Bias-Current Monitor Output. Current out of this pin develops a ground-referenced voltage across an

external resistor that is proportional to the bias current.

Shutdown Driver Output. Voltage output to control an external transistor for optional shutdown

circuitry.

Ground

Open-Collector Transmit Fault Indicator (Table 1)

Laser Bias-Current Output

Inverted Modulation-Current Output. IMOD flows into this pin when input data is low.

Noninverted Modulation-Current Output. IMOD flows into this pin when input data is high.

Monitor Photodiode Input. Connect this pin to the anode of a monitor photodiode. A capacitor to

ground is required to filter the high-speed AC monitor photocurrent.

Connect a capacitor (CAPC) between pin 19 (APCFILT1) and pin 20 (APCFILT2) to set the dominant

pole of the APC feedback loop.

(See Pin 19)

A resistor connected from this pin to ground sets the desired average optical power.

A resistor connected from this pin to ground sets the desired constant portion of the modulation

current.

Modulation-Current Compensation from Bias. Couples the bias current to the modulation current.

Mirrors IBIAS through an external resistor. Leave open for zero-coupling.

Threshold for Temperature Compensation. A resistor at this pin programs the temperature above

which compensation is added to the modulation current.

Ground. Solder the exposed pad to the circuit board ground for specified thermal and electrical

performance.

6 _______________________________________________________________________________________

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