AD9520-5SLASHPCBZ datasheet(67/80 Pages) AD

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AD9520-5

Rev. 0 | Page 67 of 80

Reg.

Addr

(Hex) Bit(s) Name

Description

[4]

[3]

[2]

[1]

[0]

Level or

Dynamic

Signal

Signal at REFMON Pin

LVL

Status of selected reference (status of differential reference);

active low.

LVL

Status of unselected reference (not available in differential mode);

active low.

LVL

Status of REF1 frequency (active low).

LVL

Status of REF2 frequency (active low).

LVL

(Status of REF1 frequency) AND (status of REF2 frequency).

LVL

(DLD) AND (status of selected reference) AND (status of VCO).

LVL

Status of CLK frequency (active low).

LVL

Selected reference (low = REF2, high = REF1).

LVL

DLD; active low.

LVL

Holdover active (active low).

LVL

LD pin comparator output (active low).

01C

[7]

Disable

switchover

deglitch

Disables or enables the switchover deglitch circuit.

[7] = 0; enable the switchover deglitch circuit (default).

[7] = 1; disable the switchover deglitch circuit.

01C

[6]

Select REF2

If Register 0x01C[5] = 0, selects the reference for PLL when in manual; register selected reference control.

[6] = 0; select REF1 (default).

[6] = 1; select REF2.

01C

[5]

Use REF_SEL

If Register 0x01C[4] = 0 (manual), sets the method of PLL reference selection.

[5] = 0; use Register 0x01C[6] (default).

[5] = 1; use REF_SEL pin.

01C

[4]

Enable

automatic

reference

switchover

Automatic or manual reference switchover. Single-ended reference mode must be selected by

[4] = 0; manual reference switchover (default).

[4] = 1; automatic reference switchover.

Setting this bit also powers on REF1 and REF2 and overrides the settings in Register 0x01C[2:1].

01C

[3]

Stay on REF2

Stays on REF2 after switchover.

[3] = 0; return to REF1 automatically when REF1 status is good again (default).

[3] = 1; stay on REF2 after switchover. Do not automatically return to REF1.

01C

[2]

Enable REF2

This bit turns the REF2 power on. This bit is overridden when automatic reference switchover is enabled.

[2] = 0; REF2 power off (default).

[2] = 1; REF2 power on.

01C

[1]

Enable REF1

This bit turns the REF1 power on. This bit is overridden when automatic reference switchover is enabled.

[1] = 0; REF1 power off (default).

[1] = 1; REF1 power on.

01C

[0]

Enable

differential

reference

Selects the PLL reference mode, differential or single-ended.

[0] = 0; single-ended reference mode (default).

[0] = 1; differential reference mode.

01D

[7]

Enable

Status_EEPROM

at STATUS pin

Enables the Status_EEPROM signal at the STATUS pin.

[7] = 0; the STATUS pin is controlled by the 0x017[7:2] selection.

[7] = 1; select the Status_EEPROM signal at the STATUS pin. This bit overrides 0x017[7:2] (default).

01D

[6]

Enable

XTAL OSC

Enables the maintaining amplifier needed by a crystal oscillator at the PLL reference input.

[6] = 0; crystal oscillator maintaining amplifier disabled (default).

[6] = 1; crystal oscillator maintaining amplifier enabled.

AD9520-5/PCBZ 数据表(PDF) 67 Page - Analog Devices

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AD9520-5/PCBZ 数据表(PDF) 67 Page - Analog Devices

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