AD9551SLASHPCBZ datasheet(35/40 Pages) AD

35 / 40 page

AD9551

Rev. B | Page 35 of 40

Input Receiver and Band Gap (Register 0x1A)

Table 27.

Address

Bit

Bit Name

Description

0x1A

Receiver reset

Input receiver reset control. This is an autoclearing bit.

0 = normal operation (default).

1 = reset input receiver logic.

[6:2]

Band gap voltage adjust

Controls the band gap voltage setting from minimum (0 0000) to maximum (1 1111).

Default is 0 0000.

Enable receiver power-down

Controls the option to power down the REFA and/or REFB receiver via Register 0x26[4]

and Register 0x1E[4], respectively.

0 = option disabled (default).

1 = option enabled.

Enable SPI control of band gap

voltage

Enables functionality of Bits[6:2].

0 = the device automatically selects receiver band gap voltage (default).

1 = Bits[6:2] define the receiver band gap voltage.

DCXO Control (Register 0x1B to Register 0x1D)

Table 28.

Address

Bit

Bit Name

Description

0x1B

Disable SPI control of DCXO

tuning capacitor

Disables functionality of Bits[5:0].

0 = tuning capacitance defined by Bits[5:0].

1 = the device automatically selects DCXO tuning capacitance (default).

Enable SPI control of DCXO

varactor

Enables functionality of Register 0x1C and Register 0x1D[7:3].

0 = the device automatically selects DCXO varactor (default).

1 = varactor defined by Register 0x1C[7:0] and Register 0x1D[7:3].

[5:0]

DCXO tuning capacitor control

Higher binary values correspond to smaller total capacitance, resulting in a higher

operating frequency. Default is 00 0000.

0x1C

[7:0]

DCXO varactor control

Bits[12:5] of the 13-bit varactor control word.

0x1D

[7:3]

DCXO varactor control

Bits[4:0] of the 13-bit varactor control word. The default varactor control word is

0 0000 0000 0000.

Select 2× frequency multiplier

Select/bypass the 2× frequency multiplier.

0 = bypassed (default).

1 = selected.

DCXO bypass

Select/bypass the DCXO.

0 = selected (default).

1 = bypassed.

Unused

Unused.

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