REGISTER DESCRIPTION

CDCE421A

www.ti.com..................................................................................................................................................................................................... SCAS873 – APRIL 2009

Table 7. Word 0

Recommended

Bit

Name

Description/Function

Type

Value

0

C0

Register selection

W

0

1

C1

Register selection

W

0

2

C2

Register selection

W

0

3

SELVCO

VCO select:

W

User

0 = VCO1

1 = VCO2

4

SELPRESC

Prescaler setting, Bit 0

W

User

5

SELPRESC

Prescaler setting, Bit 1

W

User

6

OUTSEL

Output divider select, Bit 0

W

User

7

OUTSEL

Output divider select, Bit1

W

User

8

OUTSEL

Output divider select, Bit 2

W

User

9

DRVSEL

Driver select:

W

User

0 =LVDS

1=PECL

10

TITEST1

Reserved

W

1

4

Divide by value (SELPRESC 1, SELPRESC 0)

5

Divide by 5 = (00), 3 = (01), 4 = (10), and 2 = (11)

6

Output divider (OUTSEL2, OUTSEL1, OUTSEL0)

7

Divide by 1 = (000) , 2 = (001), 4 = (010), 8 = (011), 16 = (100), 32 = (101)

8

Table 8. Word 1

Recommended

Bit

Name

Description/Function

Type

Value

0

C0

Register selection

W

1

1

C1

Register selection

W

0

2

C2

Register selection

W

0

3

LFRCSEL

Loop filter control settings, Bit 0

W

1

4

LFRCSEL

Loop filter control settings, Bit 1

W

1

5

LFRCSEL

Loop filter control settings, Bit 2

W

1

6

LFRCSEL

Loop filter control settings, Bit 3

W

1

7

LFRCSEL

Loop filter control settings, Bit 4

W

1

8

LFRCSEL

Loop filter control settings, Bit 5

W

0

9

LFRCSEL

Loop filter control settings, Bit 6

W

1

10

LFRCSEL

Loop filter control settings, Bit 7

W

0

Copyright © 2009, Texas Instruments Incorporated

Submit Documentation Feedback

13

Product Folder Link(s): CDCE421A