GENNUM CORPORATION

522 - 75 - 05

5 of 18

PIN CONNECTIONS

PIN DESCRIPTIONS

NUMBER

SYMBOL

TYPE

DESCRIPTION

1, 2

DDI/DDI

I

Digital data inputs (Differential ECL/PECL).

3, 44

I

Power supply connection for internal 75

Ω pull-up resistors connected to DDI/DDI.

4, 8, 13, 22, 35

I

Most positive power supply connection.

5, 9, 14, 18, 27,

30, 33, 34, 37

I

Most negative power supply connection.

6, 7

SDI/SDI

I

Differential analog data inputs.

10

CD_ADJ

I

Carrier detect threshold adjust.

11, 12

AGC-, AGC+

I

15

LF+

I

Loop filter component connection.

16

LFS

I

Loop filter component connection.

17

LF-

I

Loop filter component connection.

19

I

Frequency setting resistor return connection.

20

I

Frequency setting resistor connection.

21

CBG

I

Internal bandgap voltage filter capacitor.

23, 24, 25

SS[2:0]

I/O

Data rate indication (auto mode) or data rate select (manual mode). TTL/CMOS

compatible I/O. In auto mode, these pins can be left unconnected.

26

AUTO/MAN

I

Auto or manual mode select. TTL/CMOS compatible input.

SDO

SDO

SCO

SCO

AUTO/MAN

SS0

SS1

SS2

GS9025A

TOP VIEW

DDI

DDI

SDI

SDI

CD_ADJ

AGC-

1

2

3

4

5

6

7

8

9

10

11

33

32

31

30

29

28

27

26

25

24

23

12

13

14

15

16

17

18 19

20

21 22

44

43

42

41

40

39

38 37

36

35 34