AD9547SLASHPCBZ datasheet(88/104 Pages) AD

88 / 104 page

AD9547

Rev. 0 | Page 88 of 104

OPERATIONAL CONTROLS (REGISTER 0x0A00 TO REGISTER 0x0A10)

Table 118. General Power-Down

Address

Bit

Bit Name

Description

0x0A00

Reset sans regmap

Reset internal hardware but retain programmed register values.

0 (default) = normal operation.

1 = reset.

Unused

Unused.

SYSCLK power-down

Place SYSCLK input and PLL in deep sleep mode.

0 (default) = normal operation.

1 = power-down.

Reference power-down

Place reference clock inputs in deep sleep mode.

0 (default) = normal operation.

1 = power-down.

TDC power-down

Place the time-to-digital converter in deep sleep mode.

0 (default) = normal operation.

1 = power-down.

DAC power-down

Place the DAC in deep sleep mode.

0 (default) = normal operation.

1 = power-down.

Dist power-down

Place the clock distribution outputs in deep sleep mode.

0 (default) = normal operation.

1 = power-down.

Full power-down

Place the entire device in deep sleep mode.

0 (default) = normal operation.

1 = power-down.

Table 119. Loop Mode

Address

Bit

Bit Name

Description

0x0A01

Unused

Unused.

User holdover

Force the device into holdover mode.

0 (default) = normal operation.

1 = force device into holdover mode.

The device functions as though all input references are faulted.

User free run

Force the device into free-run mode.

0 (default) = normal operation.

1 = force device into free-run mode.

The free-running frequency tuning word register (Address 0x0300 to Address 0x0305)

specifies the DDS output frequency.

Note that, when user free run is set, it overrides user holdover.

[4:3]

User selection mode

Select the operating mode of the reference switching state machine.

00 (default) = automatic mode. The fully automatic priority-based algorithm selects the

active reference (Bits[1:0] are ignored).

01 = fallback mode. The active reference is the user reference (Bits[1:0]) as long as it is valid.

Otherwise, use the fully automatic priority-based algorithm to select the active reference.

10 = holdover mode. The active reference is the user reference (Bits[1:0]) as long as it is

valid. Otherwise, enter holdover mode.

11 = manual mode. The active reference is always the user reference (Bits[1:0]). When using

manual mode, be sure that the reference declared as the user reference (Bits[1:0]) is

programmed for manual reference-to-profile assignment in the appropriate manual

reference profile selection register (Address 0x0503 and Address 0x0506).

Unused

Unused. Write a 0 to this bit.

[1:0]

User reference selection

Input reference when user selection mode = 01, 10, or 11.

00 (default) = Input Reference A.

01 = Input Reference AA.

10 = Input Reference B.

11 = Input Reference BB.

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