ADS8664 Datasheet, PDF (43/79 Pages) Texas Instruments – 4- and 8-Channel, Single-Supply, SAR ADCs

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ADS8664, ADS8668
SBAS492 – JULY 2015
In order to exit STDBY mode a valid 16-bit write command must be executed to enter auto (AUTO_RST) or
manual (MAN_CH_n) scan mode, as shown in Figure 97. The device starts exiting STDBY mode on the next CS
rising edge. At the next CS falling edge, the device samples the analog input at the channel selected by the
MAN_CH_n command or the first channel of the AUTO_RST mode sequence. To ensure that the input signal is
sampled correctly, keep the minimum width of the CS signal at 20 µs after exiting STDBY mode so the device
internal circuitry can be fully powered up and biased properly before taking the sample. The data output for the
selected channel can be read during the same data frame, as explained in Figure 91.
CS
SCLK
Device exits
STDBY Mode on
CS Rising Edge
Min width of CS HIGH = 20µs
for valid sample
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
16
AUTO_RST Command
SDI
MAN_CH_n Command
SDO
Figure 97. Exit STDBY Mode Timing Diagram
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