AD9558 datasheet(95/104 Pages) AD

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Data Sheet

AD9558

Rev. A | Page 95 of 104

Table 105. IRQ Monitor for the Digital PLL

Address

Bits

Bit Name

Description

Switching

Indicates that the DPLL is switching to a new reference

Closed

Indicates that the DPLL has entered closed-loop operation

Freerun

Indicates that the DPLL has entered free run mode

Holdover

Indicates that the DPLL has entered holdover mode

Frequency unlocked

Indicates that the DPLL has lost frequency lock

Frequency locked

Indicates that the DPLL has acquired frequency lock

Phase unlocked

Indicates that the DPLL has lost phase lock

0x0D04

Phase locked

Indicates that the DPLL has acquired phase lock

Table 106. IRQ Monitor for History Update, Frequency Limit, and Phase Slew Limit

Address

Bits

Bit Name

Description

[7:5]

Reserved

History updated

Indicates the occurrence of a tuning word history update

Frequency unclamped

Indicates a frequency limiter state transition from clamped to unclamped

Frequency clamped

Indicates a frequency limiter state transition from unclamped to clamped

Phase slew unlimited

Indicates a phase slew limiter state transition from slew limiting to not slew limiting

0x0D05

Phase slew limited

Indicates a phase slew limiter state transition from not slew limiting to slew limiting

Table 107. IRQ Monitor for Reference Inputs

Address

Bits

Bit Name

Description

Reserved

REFB validated

Indicates that REFB has been validated

REFB fault cleared

Indicates that REFB has been cleared of a previous fault

REFB fault

Indicates that REFB has been faulted

Reserved

REFA validated

Indicates that REFA has been validated

REFA fault cleared

Indicates that REFA has been cleared of a previous fault

0x0D06

REFA fault

Indicates that REFA has been faulted

Reserved

REFD validated

Indicates that REFD has been validated

REFD fault cleared

Indicates that REFD has been cleared of a previous fault

REFD fault

Indicates that REFD has been faulted

Reserved

REFC validated

Indicates that REFC has been validated

REFC fault cleared

Indicates that REFC has been cleared of a previous fault

0x0D07

REFC fault

Indicates that REFC has been faulted

AD9558 Datasheet(PDF) 95 Page - Analog Devices

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