AD9552PCBZ datasheet(27/32 Pages) AD

27 / 32 page

AD9552

Rev. C | Page 27 of 32

Address

Bit

Bit Name

Description

0x18

[7:3]

P1 divider

Bits[4:0] of the 6-bit P1 divider for OUT1 (1 ≤ P1 ≤ 63). Do not set these bits to 000000. Default is

P1 = 10 0000 (32). The P1 bits are ineffective unless Register 0x19[7] = 1.

[2:0]

P0 divider

The 3-bit P0 divider for OUT1. The P0 divide value is as follows:

000 = 4 (default).

001 = 5.

010 = 6.

011 = 7.

100 = 8.

101 = 9.

110 = 10.

111 = 11.

The P0 bits are ineffective unless Register 0x19[7] = 1.

0x19

Enable SPI control of

OUT1 dividers

Controls functionality of OUT1 dividers.

0 = OUT1 dividers defined by the Y[5:0] pins (default).

1 = contents of Register 0x17 and Register 0x18 define OUT1 dividers (P0 and P1).

[6:0]

Unused

Unused.

Input Receiver and Band Gap Control (Register 0x1A)

Table 22.

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.

Unused

Unused.

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.

XTAL Control (Register 0x1B to Register 0x1D)

Table 23.

Address

Bit

Bit Name

Description

0x1B

Disable SPI control of XTAL

tuning capacitance

Disables functionality of Bits[5:0].

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

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

Unused

Unused.

[5:0]

XTAL tuning capacitor control

Capacitance value coded as inverted binary (0.25 pF per bit); that is, 111111 is 0 pF,

111110 is 0.25 pF, and so on. The default value, 000000, is 15.75 pF.

0x1C

[7:0]

Unused

Unused.

0x1D

[7:3]

Unused

Unused.

Select 2× frequency multiplier

Select/bypass the 2× frequency multiplier.

0 = bypassed (default).

1 = selected.

Unused

Unused.

Use crystal resonator

Automatic external reference select override.

0 = the device automatically selects the external reference path if an external

reference signal is present (default).

1 = the device uses the crystal resonator input whether or not an external reference

signal is present.

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