ADN2847ACPZ-48 データシートの表示（PDF） - Analog Devices

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ADN2847ACPZ-48

3.3 V Dual-Loop 50 Mbps to 3.3 Gbps Laser Diode Driver

Analog Devices 

Data Sheet

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

ADN2847

TP1 1

LBWSET 2

ASET 3

ERSET 4

PSET 5

TP2 6

IMPD 7

IMPDMON 8

IMPDMON2 9

IMPD2 10

GND4 11

VCC4 12

PIN 1

INDICATOR

ADN2847

TOP VIEW

(Not to Scale)

36 GND2

35 IDTONE

34 GND2

33 IBMON

32 IMMON

31 GND3

30 VCC3

29 ALS

28 FAIL

27 DEGRADE

26 CLKSEL

25 TP6

LBWSET 1

ASET 2

ERSET 3

PSET 4

IMPD 5

IMPDMON 6

GND4 7

VCC4 8

PIN 1

INDICATOR

ADN2847

TOP VIEW

24 IBMON

23 IMMON

22 GND3

21 VCC3

20 ALS

19 FAIL

18 DEGRADE

17 CLKSEL

NOTES

1. THE EXPOSED PAD ON THE BOTTOM OF THE

PACKAGE MUST BE CONNECTED TO VCC OR

THE GND PLANE.

Figure 7. 48-Lead LFCSP

NOTES

1. THE EXPOSED PAD ON THE BOTTOM OF THE

PACKAGE MUST BE CONNECTED TO VCC OR

THE GND PLANE.

Figure 8. 32-Lead LFCSP

Table 5. Pin Function Descriptions

Pin Number

48-Lead 32-Lead Mnemonic

1

N/A

TP1

2

1

LBWSET

3

2

ASET

4

3

ERSET

5

4

PSET

6

N/A

TP2

7

5

IMPD

8

6

IMPDMON

9

N/A

IMPDMON2

10

N/A

IMPD2

11

7

GND4

12

8

VCC4

13

9

ERCAP

14

10

PAVCAP

15

N/A

TP3

16

11

VCC1

17

N/A

GND1

18

12

DATAN

19

13

DATAP

20

14

GND1

21

15

CLKP

22

16

CLKN

23

N/A

TP4

24

N/A

TP5

25

N/A

TP6

26

17

CLKSEL

27

18

DEGRADE

28

19

FAIL

29

20

ALS

Description

Test Pin. In normal operation, TP1 = GND.

Select Low Loop Bandwidth.

Alarm Current Threshold Setting Pin.

Extinction Ratio Set Pin.

Average Optical Power Set Pin.

Test Pin. In normal operation, TP2 = GND.

Monitor Photodiode Input.

Mirrored Current from Monitor Photodiode.

Mirrored Current from Monitor Photodiode 2. (For use with two MPDs).

Monitor Photodiode Input 2. (For use with two MPDs).

Supply Ground.

Supply Voltage.

Extinction Ratio Loop Capacitor.

Average Power Loop Capacitor.

Test Pin. In normal operation, TP3 = GND.

Supply Voltage.

Supply Ground.

Data, Negative Differential Terminal.

Data, Positive Differential Terminal.

Supply Ground.

Data Clock Positive Differential Terminal. Used if CLKSEL = VCC.

Data Clock Negative Differential Terminal. Used if CLKSEL = VCC.

Test Pin. In normal operation, TP4 = GND.

Test Pin. In normal operation, TP5 = GND.

Test Pin. In normal operation, TP6 = GND.

Clock Select. Active = VCC. Used if data is clocked into chip.

Degrade Alarm Output.

Fail Alarm Output.

Automatic Laser Shutdown.

Rev. B | Page 7 of 16

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