AD9548SLASHPCBZ datasheet(76/112 Pages) AD

76 / 112 page

AD9548

Rev. 0 | Page 76 of 112

Table 61. Incremental Closed-Loop Phase Lock Offset Step Size1

Address

Bits

Bit Name

Description

0314

[7:0]

Incremental phase lock

offset step size

(expressed in pico-

seconds per step)

Incremental phase lock offset step size, Bits[7:0]

0315

[7:0]

Incremental phase lock offset step size, Bits[15:8]

1 The default incremental closed-loop phase lock offset step size value is 0x03E8 = 1000 (1 ns).

Table 62. Phase Slew Rate Limit1

Address

Bits

Bit Name

Description

0316

[7:0]

Phase slew limit

(expressed in nano-

seconds per second)

Phase slew rate limit, Bits[7:0]

0317

[7:0]

Phase slew rate limit, Bits[15:8]

1 The default phase slew rate limit is 0 (or disabled).

Table 63. History Accumulation Timer1

Address

Bits

Bit Name

Description

0318

[7:0]

History accumulation

timer (expressed in

milliseconds)

History accumulation timer, Bits[7:0]

0319

[7:0]

History accumulation timer, Bits[15:8]

031A

[7:0]

History accumulation timer, Bits[23:16]

1 Do not program a timer value of 0. The history accumulation timer default value is 0x007530 = 30,000 (30 sec).

Table 64. History Mode

Address

Bits

Bit Name

Description

031B

[7:5]

Unused

[4]

Single-sample fallback

Controls the holdover history. If tuning word history is not available for the reference

that was active just prior to holdover, then

0 (default) = use the free running frequency tuning word register value.

1 = use the last tuning word from the DPLL.

[3]

Persistent history

Controls the holdover history initialization. When switching to a new reference

0 (default) = clear the tuning word history.

1 = retain the previous tuning word history.

[2:0]

Incremental average

History mode value from 0 to 7 (default = 0).

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