AD9523-1SLASHPCBZ datasheet(48/60 Pages) AD

48 / 60 page

AD9523-1

Rev. B | Page 48 of 60

Table 42. PLL1 Miscellaneous Control

Address

Bits

Bit Name

Description

Enable REFB R divider

independent division control

1: REFB R divider is controlled by Register 0x012 and Register 0x013.

0: REFB R divider is set to the same setting as the REFA R divider (Register 0x010

and Register 0x011). This requires that, for the loop to stay locked, the REFA and

REFB input frequencies must be the same.

OSC_CTRL control voltage to

VCC/2 when reference clock fails

High permits the OSC_CTRL control voltage to be forced to midsupply when the

feedback or input clocks fail. Low tristates the charge pump output.

1: OSC_CTRL control voltage goes to VCC/2.

0: OSC_CTRL control voltage tracks the tristated (high impedance) charge pump

(through the buffer).

Reserved

Reserved.

Programs the REFA, REFB mode selection (default = 000).

REF_SEL

Bit 4

Bit 3

Bit 2

Description

Nonrevertive: stay on REFB.

Revert to REFA.

Select REFA.

Select REFB.

REF_SEL pin = 0 (low): REFA.

[4:2]

Reference selection mode

REF_SEL pin = 1 (high): REFB.

Bypass REFB R divider

Puts the divider into bypass mode (same as programming divider word to 0 or 1).

1: divider in bypass mode (divide = 1).

0: divider normal operation.

0x01C

Bypass REFA R divider

Puts the divider into bypass mode (same as programming divider word to 0 or 1).

1: divider in bypass mode (divide = 1).

0: divider normal operation.

1 X = don’t care.

Table 43. PLL1 Loop Filter Zero Resistor Control

Address

Bits

Bit Name

Description

[7:4]

Reserved

Reserved.

Programs the value of the zero resistor, RZERO.

Bit 3

Bit 2

Bit 1

Bit 0

RZERO Value (kΩ)

883

677

341

135

0x01D

[3:0]

PLL1 loop filter, RZERO

Use external resistor

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