AD6643 datasheet(28/36 Pages) AD

Part #	AD6643

Description	Dual IF Receiver 1.8 V supply voltages Internal ADC voltage reference

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AD6643

Rev. 0 | Page 28 of 36

SPI ACCESSIBLE FEATURES

Table 13 provides a brief description of the general features that

are accessible via the SPI. These features are described in detail

in the AN-877 Application Note, Interfacing to High Speed ADCs

via SPI (available at www.analog.com). The AD6643 part-

specific features are described in the Memory Map Register

Description section.

Table 13. Features Accessible Using the SPI

Feature Name

Description

Power Mode

Allows the user to set either power-down

mode or standby mode

Clock

Allows the user to access the DCS via the SPI

Offset

Allows the user to digitally adjust the

converter offset

Test I/O

Allows the user to set test modes to have

known data on output bits

Output Mode

Allows the user to set up outputs

Output Phase

Allows the user to set the output clock polarity

Output Delay

Allows the user to vary the DCO delay

VREF

Allows the user to set the reference voltage

Digital Processing

Allows the user to enable the synchroniza-

tion features

DON’T CARE

SDIO

SCLK

CSB

tS

tDH

tCLK

tDS

tH

R/W

W1

W0

A12

A11

A10

A9

A8

A7

D5

D4

D3

D2

D1

D0

tLOW

tHIGH

Figure 45. Serial Port Interface Timing Diagram

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