AD4697 datasheet(43/107 Pages) AD

43 / 107 page

Data Sheet

AD4697/AD4698

THEORY OF OPERATION

analog.com

Rev. 0 | 43 of 107

Table 18 shows the valid commands for selecting IN0 to IN7 or the

temperature sensor. Commands other than those listed in

Table 18 are treated as NOOP commands and result in the multi-

plexer repeating the previous channel.

When single-cycle command mode is enabled, the first analog input

channel selected is the one specified in the AS_SLOT0 register.

The channel only updates after a valid command is received.

To enable single-cycle command mode, set the STD_SEQ_EN

bit to 0, set the NUM_SLOTS_AS bit field to 0x00, and set the

CYC_CTRL bit to 1 (see Table 15).

When single-cycle command mode is enabled, the configuration

settings for each channel are set with the corresponding CON-

FIG_INn register. Therefore, all analog inputs can have different

channel configuration options, analog input high-Z mode enable

settings, and threshold detection enable settings. Configure each

CONFIG_INn register before entering conversion mode and initiat-

ing conversions.

Oversampling is not supported when single-cycle command mode

is enabled. Set the OSR for all analog inputs to 1 before entering

conversion mode with single-cycle command mode enabled (see

the Oversampling and Decimation section).

Figure 76. Standard Sequencer Example with OSR = 1

Figure 77. Advanced Sequencer Example with OSR = 1 for All Channels

Figure 78. Standard Sequencer and Advanced Sequencer SPI Frames with IN0 OSR = N

AD4697 Datasheet(PDF) 43 Page - Analog Devices