AD9148BBCZ datasheet(30/73 Pages) AD

30 / 73 page

AD9148

Preliminary Technical Data

Rev. PrA | Page 30 of 73

Addr

(Hex)

Bit

Name

Function

Default

FIFO Status Port A

7:0

FIFO Level

Thermometer encoded measure of the FIFO level.

Read-

only

FIFO status/

Control Port B

FIFO Warning 1

FIFO read and write pointers within ±1.

Read-

only

FIFO Warning 2

FIFO read and write pointers within ±2.

Read-

only

FIFO reset aligned

FIFO read and write pointers aligned after chip reset.

Read-

only

FIFO SPI align

acknowledge

FIFO read and write pointers aligned after SPI driven FIFO

reset.

Read-

only

FIFO SPI align

requesting

Request FIFO read and write pointers alignment via SPI.

2:0

FIFO phase offset

FIFO read and write pointer phase offset from optimal

phase following FIFO reset.

000

000 = 0 offset from optimal phase.

…

111 = 7 offset from optimal phase.

The optimal value is 0.

FIFO Status Port B

7:0

FIFO level

Thermometer encoded measure of the FIFO Level

Read-

only

HB1 Control

Enable pre mod

Enable fS/2 modulation stage that precedes Stage 1

interpolation filter.

Bypass sinc-1

Sinc-1 filter bypass.

2:1

HB1[1:0]

Modulation mode for first stage interpolation filter

(fHB1 = 2 × fIN1).

00 = input signal modulated by dc. Filter pass band is

from −0.2 to +0.2 of fHB1.

01 = input signal modulated by dc. Filter pass band is

from 0.05 to 0.45 of fHB1.

10 = input signal modulated by fHB1/2. Filter pass band is

from 0.3 to 0.7 of fHB1.

11 = input signal modulated by fHB1/2. Filter pass band is

from 0.55 to 0.95 of fHB1.

Bypass HB1

First stage interpolation filter bypass.

AD9148BBCZ Datasheet(PDF) 30 Page - Analog Devices

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