MAX3669(1999) Просмотр технического описания (PDF) - Maxim Integrated

Номер в каталоге

Компоненты Описание

производитель

MAX3669
(Rev.:1999)

+3.3V, 622Mbps SDH/SONET Laser Driver with Current Monitors and APC

Maxim Integrated 

+3.3V, 622Mbps SDH/SONET

Laser Driver with Current Monitors and APC

PIN

1, 2, 6, 15,

17, 20, 24

3

4

5, 10, 14, 21,

22, 30

7

8

9

11

12, 13, 26,

27, 28

16

18

NAME

VCC

DATA+

DATA-

GND

BIASMON

MODMON

ENABLE

FAIL

N.C.

BIAS

OUT+

19

OUT-

23

MD

25

CAPC

29

APCSET

31

MODSET

32

BIASMAX

Pin Description

FUNCTION

Positive Supply Voltage

Positive PECL Data Input

Negative PECL Data Input

Ground

Sink Current Source—proportional to the laser bias current.

Sink Current Source—proportional to the laser modulation current.

TTL/CMOS Enable Input. High for normal operation, low to disable laser bias and modulation

currents. Internally pulled high.

TTL Output. Indicates APC failure when low. Internally pulled high through a 6kΩ resistor.

No Connection. Leave unconnected.

Laser Bias Current Output. Isolate from laser with a ferrite bead.

Positive Modulation Current Output. IMOD flows into this pad when the input signal is high.

Connect this pad to AC-coupling network.

Negative Modulation Current Output. IMOD flows into this pad when the input signal is low.

Connect this pad to VCC through a 6.3Ω resistor.

Monitor Photodiode Connection. Connect this pad to the monitor photodiode anode. A capaci-

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

APC Compensation Capacitor. A 0.1µF capacitor connected from this pad to ground controls

the dominant pole of the APC feedback loop.

APC Set Resistor. A resistor connected from this pad to ground sets the desired average opti-

cal power. The resulting current is equal to the desired DC monitor diode current. Connect a

100kΩ resistor from this pad to ground if APC is not used.

Modulation Set Resistor. A resistor from this pad to ground sets the laser modulation current.

Maximum Bias Set Resistor. A resistor from this pad to ground sets the maximum laser bias

current. The APC function can subtract from this maximum value but cannot add to it. This

resistor controls the bias-current level when the APC loop is not used.

6 _______________________________________________________________________________________

Share Link: