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Data Sheet

AD9642

SPI ACCESSIBLE FEATURES

Table 12 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.

Table 12. Features Accessible Using the SPI

Feature Name

Description

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 synchronization features

DON’T

CARE

DON’T

CARE

DON’T

CARE

DON’T

CARE

SDIO

SCLK

CSB

tDH

tCLK

tDS

R/W

A12

A11

A10

tLOW

tHIGH

Figure 58. Serial Port Interface Timing Diagram

Rev. B | Page 23 of 28

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