AD9516-2SLASHPCBZ datasheet(66/84 Pages) AD

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AD9516-2

Rev. 0 | Page 66 of 84

Reg.

Addr

(Hex) Bit(s) Name

Description

<4>

<3> <2>

<1>

<0>

Level or

Dynamic

Signal

Signal at REFMON Pin

DYN

Unselected reference to PLL (not available when in

differential mode).

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 VCO frequency (active low).

LVL

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

LVL

Digital lock detect (DLD); active low.

LVL

Holdover active (active low).

LVL

LD pin comparator output (active low).

<7>

Disable

Disable or enable the switchover deglitch circuit.

Switchover

<7> = 0; enable switchover deglitch circuit.

Deglitch

<7> = 1; disable switchover deglitch circuit.

<6>

Select REF2

If Register 0x1C<5> = 0, select reference for PLL.

<6> = 0; select REF1.

<6> = 1; select REF2.

<5>

Use REF_SEL If Register 0x1C<4> = 0 (manual), set method of PLL reference selection.

<5> = 0; use Register 0x1C<6>.

<5> = 1; use REF_SEL pin.

<4>

Automatic

Reference

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

Switchover

<4> = 0; manual reference switchover.

<4> = 1; automatic reference switchover.

Stay on REF2 after switchover.

<3> = 0; return to REF1 automatically when REF1 status is good again.

<3>

Stay on REF2

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

<2>

REF2

When automatic reference switchover is disabled, this bit turns the REF2 power on.

Power On

<2> = 0; REF2 power off.

<2> = 1; REF2 power on.

<1>

REF1

When automatic reference switchover is disabled, this bit turns the REF1 power on.

Power On

<1> = 0; REF1 power off.

<1> = 1; REF1 power on.

<0>

Differential

Reference

Selects the PLL reference mode, differential or single-ended. Single-ended must be selected for the

automatic switchover or REF1 and REF2 to work.

<0> = 0; single-ended reference mode.

<0> = 1; differential reference mode.

<4>

PLL Status

Disables the PLL status register readback.

<4> = 0; PLL status register enable.

Disable

<4> = 1; PLL status register disable.

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