AD9528 datasheet(67/68 Pages) AD

67 / 68 page

AD9528

Data Sheet

Rev. C | Page 66 of 67

Address

Bits

Bit Name

Description

PLL2 REF divide by 2

PLL2 PFD up divide by 2

Note that all bit combinations after 010111 are reserved.

0x0507

[7:4]

Reserved

Reserved.

STATUS1 pin Output

enable

Enables the status on the STATUS1 pin.

1: enable status output.

0: disable status output.

STATUS0 pin Output

enable

Enables the status on the STATUS0 pin.

1: enable status output.

0: disable status output.

STATUS0 pin divider

enable

Enables a divide by 4 on the STATUS0 pin, allowing dynamic signals to be viewed at a lower

frequency (such as the PFD input clocks). Not to be used with dc states on the status pins,

which occur when the settings of Register 0x0505, Bits[5:0] are in the range of 000000 to 001111.

1: enabled.

0: disabled.

STATUS1 pin divider

enable

Enables a divide by 4 on the STATUS1 pin, allowing dynamic signals to be viewed at a lower

frequency (such as the PFD input clocks). Not to be used with dc states on the status pins,

which occur when the settings of Register 0x0506, Bits[5:0] are in the range of 000000 to 001111.

1: enable.

0: disable.

Table 68. Readback Registers (Readback 0 and Readback 1)

Address

Bits

Bit Name

Description

0x0508

PLL2 feedback status

1 = correct.

0 = off/clocks are missing.

PLL1 feedback status

1 = correct.

0 = off/clocks are missing.

VCXO status

1 = correct.

0 = off/clocks are missing.

Both REFA/REFB missing

1 = off/clocks are missing.

0 = correct.

REFB status

1 = correct.

0 = off/clocks are missing.

REFA status

1 = correct.

0 = off/clocks are missing.

PLL2 locked status

1 = locked.

0 = unlocked.

PLL1 locked status

1 = locked.

0 = unlocked.

0x0509

[7:4]

Reserved

Reserved.

Holdover active status

1 = holdover is active (both references are missing).

0 = normal operation.

Selected reference

Selected reference (applies only when the device automatically selects the

reference; for example, not in manual control mode).

1 = REFB.

0 = REFA.

Fast Lock in progress

1 = fast lock in progress.

0 = fast lock not in progress.

VCO calibration busy status

1 = VCO calibration in progress.

0 = VCO calibration not in progress.

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