CDCM6208V1RGZT datasheet(64/78 Pages) TI

Part #	CDCM6208V1RGZT

Description	2:8 CLOCK GENERATOR, JITTER CLEANER WITH FRACTIONAL DIVIDERS

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Manufacturer	TI [Texas Instruments]

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CDCM6208

SCAS931A – MAY 2012 – REVISED JUNE 2012

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Table 34. Register 15

BIT

BIT NAME

RELATED BLOCK

DESCRIPTION/FUNCTION

15

RESERVED

This bit must be set to 0

14

RESERVED

This bit must be set to 0

13

RESERVED

This bit must be set to 0

Output channel 6 fractional divider's 3-b pre-divider setting(this pre-

divider is bypassed if Q15.9 = 0)

000

→ Divide by 2

12:10

PRE_DIV_CH6[2:0]

001

→ Divide by 3

111

→ Divide by 1; (only for CDCM6208V1 with fVCO ≤ 2.4GHz)

All other combinations reserved

Output channel 6 fractional divider enable:

9

EN_FRACDIV_CH6

0

→ Disable

1

→ Enable

Output channel 6 LVCMOS output slew:

8

LVCMOS_SLEW_CH6

0

→ Normal

1

→ Slow

Output channel 6 negative-side LVCMOS enable:

0

→ Disable

7

EN_LVCMOS_N_CH6

1

→ Enable (Negative side can only be enabled if positive side is

enabled)

Output Channel 6

Output channel 6 positive-side LVCMOS enable:

6

EN_LVCMOS_P_CH6

0

→ Disable

1

→ Enable

5

RESERVED

This bit must be set to 0

Output channel 6 type selection:

00 or 01

→ LVDS

4:3

SEL_DRVR_CH6[1:0]

10

→ LVCMOS

11

→ HCSL

Output channel 6 enable:

00

→ Disable

2:1

EN_CH6[1:0]

01

→ Enable

10

→ Drive static 0

11

→ Drive static 1

Output channel 6 Supply Voltage Selection:

0

SUPPLY_CH6 (1)

0

→ 1.8 V

1

→ 2.5/3.3 V

(1)

It is ok to power up the device with a 2.5 V/3.3 V supply while this bit is set to 0 and to update this bit thereafter.

Table 35. Register 16

BIT

BIT NAME

RELATED BLOCK

DESCRIPTION/FUNCTION

15

RESERVED

This bit must be set to 0

14

RESERVED

This bit must be set to 0

13

RESERVED

This bit must be set to 0

12

RESERVED

This bit must be set to 0

Output channel 6 8-b integer divider setting

11:4

OUTDIV6[7:0]

(Divider value is register value +1)

Output Channel 6

3:0

FRACDIV6[19:16]

Output channel 6 20-b fractional divider setting, bits 19-16

Table 36. Register 17

BIT

BIT NAME

RELATED BLOCK

DESCRIPTION/FUNCTION

15:0

FRACDIV6[15:0]

Output Channel 6

Output channel 6 20-b fractional divider setting, bits 15-0

Table 37. Register 18

BIT

BIT NAME

RELATED BLOCK

DESCRIPTION/FUNCTION

15

RESERVED

This bit must be set to 0

14

RESERVED

This bit must be set to 0

64

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