AD9558 datasheet(76/104 Pages) AD

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AD9558

Data Sheet

Rev. A | Page 76 of 104

Table 52. IRQ Mask for Reference Inputs

Address

Bits

Bit Name

Description

Reserved

REFB validated

Enables IRQ for indicating that REFB has been validated

REFB fault cleared

Enables IRQ for indicating that REFB has been cleared of a previous fault

REFB fault

Enables IRQ for indicating that REFB has been faulted

Reserved

REFA validated

Enables IRQ for indicating that REFA has been validated

REFA fault cleared

Enables IRQ for indicating that REFA has been cleared of a previous fault

0x020E

REFA fault

Enables IRQ for indicating that REFA has been faulted

0x020F

[7:0]

Reserved

Table 53. Watchdog Timer 11

Address

Bits

Bit Name

Description

0x0210

[7:0]

Watchdog timer, Bits[7:0]; default: 0x00

0x0211

[7:0]

Watchdog timer (ms)

Watchdog timer, Bits[15:8]; default: 0x00

1 Note that the watchdog timer is expressed in units of milliseconds (ms). The default value is 0 (disabled).

DPLL CONFIGURATION (REGISTER 0x0300 TO REGISTER 0x032E)

Table 54. Free Run Frequency Tuning Word1

Address

Bits

Bit Name

Description

0x0300

[7:0]

Free run frequency tuning word, Bits[7:0]; default: 0x11

0x0301

[7:0]

Free run frequency tuning word, Bits[15:8]; default: 0x15

0x0302

[7:0]

30-bit free run frequency tuning word

Free run frequency tuning word, Bits[23:9]; default: 0x64

0x0303

[7:6]

Reserved

[5:0]

30-bit free run frequency word

Free run frequency tuning word, Bits[29:24]; default: 0x1B

1 Note that the default free run tuning word is 0x1B641511, which is used for 8 kHz/19.44 MHz = 622.08 MHz translation.

Table 55. Digital Oscillator Control

Address

Bits

Bit Name

Description

[7:6]

Reserved

Default: 00b

DCO 4-level output

0 (default) = DCO 3-level output mode

1 = enables DCO 4-level output mode

Reserved

Reserved (must be set to 1b)

0x0304

[3:0]

Reserved

Reserved (default: 0x0)

Table 56. DPLL Frequency Clamp

Address

Bits

Bit Name

Description

0x0306

[7:0]

Lower limit pull-in range, Bits[7:0].

Default: 0x51.

0x0307

[7:0]

Lower limit of pull-in range (expressed

as a 20-bit frequency tuning word)

Lower limit pull-in range, Bits[15:8].

Default: 0xB8.

0x0308

[7:4]

Reserved

Default: 0x0.

[3:0]

Lower limit of pull-in range

Lower limit pull-in range, Bits[19:16].

Default: 0x2.

0x0309

[7:0]

Upper limit pull-in range, Bits[7:0].

Default: 0x3E.

0x030A

[7:0]

Upper limit of pull-in range

(expressed as a 20-bit frequency

tuning word)

Upper limit pull-in range, Bits[15:8].

Default: 0x0A.

0x030B

[7:4]

Reserved

Default: 0x0.

[3:0]

Upper limit of pull-in range

Upper limit pull-in range, Bits[19:16].

Default: 0xB.

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