AD9523 datasheet(56/60 Pages) AD

Part #	AD9523

Description	Jitter Cleaner and Clock Generator

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Manufacturer	AD [Analog Devices]

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AD9523

Data Sheet

Rev. D | Page 56 of 60

Table 52. PLL1 Output Control (PLL1_OUT, Pin 72)

Address

Bits

Bit Name

Description

0x1BA

[7:5]

Reserved

4

PLL1 output CMOS driver

strength

CMOS driver strength

1: weak

0: strong

[3:0]

PLL1 output divider

0000: divide-by-1

0001: divide-by-2 (default)

0010: divide-by-4

0100: divide-by-8

1000: divide-by-16

No other inputs permitted

Table 53. PLL1 Output Channel Control

Address

Bits

Bit Name

Description

0x1BB

7

PLL1 output driver power-down

[6:4]

Reserved

3

Route VCXO clock to

Channel 3 divider input

1: channel uses VCXO clock. Routes VCXO clock to divider input.

0: channel uses VCO divider output clock

2

Route VCXO clock to

Channel 2 divider input

1: channel uses VCXO clock. Routes VCXO clock to divider input.

0: channel uses VCO divider output clock

1

Route VCXO clock to

Channel 1 divider input

1: channel uses VCXO clock. Routes VCXO clock to divider input.

0: channel uses VCO divider output clock

0

Route VCXO clock to

Channel 0 divider input

1: channel uses VCXO clock. Routes VCXO clock to divider input.

0: channel uses VCO divider output clock

Readback (Address 0x22C to Address 0x22D)

Table 54. Readback Registers (Readback 0 and Readback 1)

Address

Bits

Bit Name

Description

0x22C

7

Status PLL2 reference clock

1: OK

0: off/clocks are missing

6

Status PLL1 feedback clock

1: OK

0: off/clocks are missing

5

Status VCXO

1: OK

0: off/clocks are missing

4

Status REF_TEST

1: OK

0: off/clocks are missing

3

Status REFB

1: OK

0: off/clocks are missing

2

Status REFA

1: OK

0: off/clocks are missing

1

Lock detect PLL2

1: locked

0: unlocked

0

Lock detect PLL1

1: locked

0: unlocked

0x22D

[7:4]

Reserved

3

Holdover active

1: holdover is active (both references are missing)

0: normal operation

2

Selected reference

(in auto mode)

Selected reference (applies only when the device automatically selects the reference;

for example, not in manual control mode)

1: REFB

0: REFA

1

Reserved

0

VCO calibration in progress

1: VCO calibration in progress

0: VCO calibration not in progress

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