AD9553SLASHPCBZ datasheet(35/44 Pages) AD

35 / 44 page

AD9553

Rev. 0 | Page 35 of 44

Address

Bit

Bit Name

Description

0x0C

[7:3]

Unused

Unused.

[2:0]

Charge Pump Clock Div

Enables the PFD clock dividers (used for test only via test mux).

000 = test clocks disabled, normal operation (default).

001 = divide feedback clock by 2.

010 = divide PFD reference input clock by 2.

011 = divide PFD reference input and feedback clocks by 2.

100 = divide pump-up clock by 2.

101 = divide pump-up and feedback clocks by 2.

110 = divide pump-up and PFD reference input clocks by 2.

111 = divide feedback, pump-up, and pump-down clocks by 2.

0x0D

[7:6]

Antibacklash control

Controls the PFD antibacklash period of the PLL. These bits are ineffective unless

00 = minimum (default).

01 = low.

10 = high.

11 = maximum.

[5:1]

Unused

Unused.

PLL lock detector power-

down

Controls power-down of the PLL lock detector.

0 = lock detector active (default).

1 = lock detector powered down.

VCO Control (Register 0x0E to Register 0x10)

Table 30.

Address

Bit

Bit Name

Description

0x0E

Calibrate VCO

Initiates VCO calibration (this is an autoclearing bit).

This bit is ineffective unless Register 0x0E[2] = 1.

Enable ALC

Enables automatic level control (ALC) of the VCO.

0 = Register 0x0F[7:2] defines the VCO level.

1 = the device automatically controls the VCO level (default).

[5:3]

ALC threshold

Controls the VCO ALC threshold detector level from minimum (000) to maximum

(111). The default is 110.

Enable SPI control of VCO

calibration

Enables the functionality of Register 0x0E[7].

0 = the device automatically performs VCO calibration (default).

1 = VCO calibration controlled by Register 0x0E[7].

Boost VCO supply

Selects VCO supply voltage.

0 = normal supply voltage (default).

1 = increase supply voltage by 100 mV.

Enable SPI control of VCO band

setting

Controls VCO band setting functionality.

0 = the device automatically selects the VCO band (default).

1 = VCO band defined by Register 0x10[7:1].

0x0F

[7:2]

VCO level control

Controls the VCO amplitude from minimum (00 0000) to maximum (11 1111). The

default is 10 0000.

These bits are ineffective unless Register 0x0E[6] = 0.

[1:0]

Unused

Unused.

0x10

[7:1]

VCO band control

Controls the VCO frequency band from minimum (000 0000) to maximum (111 1111).

The default is 100 0000.

These bits are ineffective unless Register 0x0E[0] = 1.

Unused

Unused.

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