AD9146BCPZ datasheet(23/52 Pages) AD

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AD9146

Rev. 0 | Page 23 of 52

Name

Address

(Hex)

Bits

Name

Description

Default

FIFO Control

0x17

[2:0]

FIFO Phase Offset[2:0]

FIFO write pointer phase offset following FIFO reset. This

is the difference between the read pointer and the write

pointer values upon FIFO reset. The optimal value is

nominally 4 (100).

100

000 = 0.

001 = 1.

…

111 = 7.

FIFO Status

0x18

FIFO Warning 1

1 = FIFO read and write pointers are within ±1.

N/A

FIFO Warning 2

1 = FIFO read and write pointers are within ±2.

N/A

FIFO soft align

acknowledge

1 = FIFO read and write pointers are aligned after a serial

port initiated FIFO reset.

N/A

FIFO soft align request

1 = request FIFO read and write pointer alignment via the

serial port.

0x19

[7:0]

FIFO Level[7:0]

Thermometer encoded measure of the FIFO level.

N/A

Datapath

Control

0x1B

Bypass premod

1 = bypass the fS/2 premodulator.

Bypass sinc−1

1 = bypass the inverse sinc filter.

Set to 1

Set this bit to 1 for proper operation.

Bypass phase

compensation

and dc offset

1 = bypass phase compensation and dc offset.

Select sideband

0 = the modulator outputs the high-side image.

1 = the modulator outputs the low-side image. The image is

spectrally inverted compared to the input data.

Send I data to Q data

1 = ignore Q data from the interface and disable the clocks

to the Q datapath. Send I data to both the I and Q DACs.

HB1 Control

0x1C

[2:1]

HB1[1:0]

Modulation mode for I Side Half-Band Filter 1.

00 = input signal not modulated; filter pass band is from

−0.4 to +0.4 of fIN1.

01 = input signal not modulated; filter pass band is from

0.1 to 0.9 of fIN1.

10 = input signal modulated by fIN1; filter pass band is from

0.6 to 1.4 of fIN1.

11 = input signal modulated by fIN1; filter pass band is from

1.1 to 1.9 of fIN1.

Bypass HB1

1 = bypass the first-stage interpolation filter.

HB2 Control

0x1D

[6:1]

HB2[5:0]

Modulation mode for I Side Half-Band Filter 2.

000000

000000 = input signal not modulated; filter pass band is

from −0.25 to +0.25 of fIN2.

001001 = input signal not modulated; filter pass band is

from 0.0 to 0.5 of fIN2.

010010 = input signal not modulated; filter pass band is

from 0.25 to 0.75 of fIN2.

011011 = input signal not modulated; filter pass band is

from 0.5 to 1.0 of fIN2.

100100 = input signal modulated by fIN2; filter pass band is

from 0.75 to 1.25 of fIN2.

101101 = input signal modulated by fIN2; filter pass band is

from 1.0 to 1.5 of fIN2.

110110 = input signal modulated by fIN2; filter pass band is

from 1.25 to 1.75 of fIN2.

111111 = input signal modulated by fIN2; filter pass band is

from 1.5 to 2.0 of fIN2.

Bypass HB2

1 = bypass the second-stage interpolation filter.

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