MAX3869 Просмотр технического описания (PDF) - Maxim Integrated

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производитель

MAX3869

+3.3V, 2.5Gbps SDH/SONET Laser Driver with Current Monitors and APC

Maxim Integrated 

+3.3V, 2.5Gbps SDH/SONET Laser Driver

with Current Monitors and APC

Typical Operating Characteristics (continued)

(VCC = +3.3V, load as shown in Figure 2, TA = +25°C, unless otherwise noted.)

MODULATION-CURRENT MONITOR GAIN

vs. TEMPERATURE

40

35

IBIAS = 100mA, IMOD = 50mA

30

25

IBIAS = 10mA, IMOD = 10mA

20

15

10

5

0

-40 -15

10

35

60

85

TEMPERATURE (°C)

PULSE-WIDTH DISTORTION

vs. IMOD

25

20

VCC = +3.3V

15

10

VCC = +5V

5

0.

5 10 20 30 40 50 60

IMOD (mA)

PIN

1, 4, 7

2

3

5

6

8

9

10, 15

11

12

13

14

16, 18, 21

17

19

Pin Description

NAME

VCC1

DATA+

DATA-

CLK+

CLK-

LATCH

ENABLE

GND1

BIASMON

MODMON

FAIL

APCFILT

VCC4

BIAS

OUT+

FUNCTION

Power Supply for Digital Circuits

Noninverting PECL Input

Inverting PECL Input

Positive PECL Clock Input. Connect to VCC if latch function is not used.

Negative PECL Clock Input. Leave unconnected if latch function is not used.

TTL/CMOS Latch Input. High for latched data, low for direct data. Internal 100kΩ pull-up to VCC.

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

current. Internal 100kΩ pull-up to VCC.

Ground for Digital Circuits

Bias Current Monitor. Sink current source that is proportional to the laser bias current.

Modulation Current Monitor. Sink current source that is proportional to the laser modulation

current.

TTL/CMOS Failure Output. Indicates APC failure when low.

Connect a capacitor (CAPCFILT = 0.1µF) from this pad to ground to filter the APC noise.

Power Supply for Output Circuitry

Laser Bias Current Output

Positive Modulation-Current Output. IMOD flows through this pad when input data is high.

6 _______________________________________________________________________________________

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