AD9146BCPZ datasheet(21/52 Pages) AD

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AD9146

Rev. 0 | Page 21 of 52

Name

Address

(Hex)

Bits

Name

Description

Default

Clock

Receiver

Control

0x08

DACCLK duty correction

1 = enable duty cycle correction on the DACCLK input.

REFCLK duty correction

1 = enable duty cycle correction on the REFCLK input.

DACCLK cross-correction

1 = enable differential crossing correction on the DACCLK

input.

REFCLK cross-correction

1 = enable differential crossing correction on the

REFCLK input.

PLL

Control

0x0A

PLL enable

1 = enable the PLL clock multiplier. The REFCLK input is

used as the PLL reference clock signal.

PLL manual enable

1 = enable manual selection of the VCO band. The correct

VCO band must be determined by the user and written to

Bits[5:0].

[5:0]

Manual VCO Band[5:0]

Selects the VCO band to be used.

000000

0x0C

[7:6]

PLL Loop Bandwidth[1:0]

Selects the PLL loop filter bandwidth.

00 = widest bandwidth.

…

11 = narrowest bandwidth.

[4:0]

PLL Charge Pump

Current[4:0]

Sets the nominal PLL charge pump current.

10001

00000 = lowest current setting.

…

11111 = highest current setting.

0x0D

[7:6]

N2[1:0]

PLL control clock divider. This divider determines the ratio

of the DACCLK frequency to the PLL controller clock

frequency. fPC_CLK must always be less than 75 MHz.

00 = fDACCLK/fPC_CLK = 2.

01 = fDACCLK/fPC_CLK = 4.

10 = fDACCLK/fPC_CLK = 8.

11 = fDACCLK/fPC_CLK = 16.

PLL cross-control enable

1 = enable PLL cross-point controller.

[3:2]

N0[1:0]

PLL VCO divider. This divider determines the ratio of the

VCO frequency to the DACCLK frequency.

00 = fVCO/fDACCLK = 1.

01 = fVCO/fDACCLK = 2.

10 = fVCO/fDACCLK = 4.

11 = fVCO/fDACCLK = 4.

[1:0]

N1[1:0]

PLL loop divider. This divider determines the ratio of the

DACCLK frequency to the REFCLK frequency.

00 = fDACCLK/fREFCLK = 2.

01 = fDACCLK/fREFCLK = 4.

10 = fDACCLK/fREFCLK = 8.

11 = fDACCLK/fREFCLK = 16.

PLL Status

0x0E

PLL locked

1 = the PLL-generated clock is tracking the REFCLK input

signal.

N/A

[3:0]

VCO Control Voltage[3:0]

VCO control voltage readback. See Table 22.

N/A

0x0F

[5:0]

VCO Band Readback[5:0]

Indicates the VCO band currently selected.

N/A

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