Datasheet

15
ADC081S021
www.ti.com SNAS308G –APRIL 2005–REVISED MAY 2016
Product Folder Links: ADC081S021
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Device Functional Modes (continued)
Figure 21. Entering Shutdown Mode
Figure 22. Entering Normal Mode
To exit shutdown mode, bring CS back low. Upon bringing CS low, the ADC begins powering up (power-up time
is specified in Timing Requirements). This microsecond of power-up delay results in the first conversion result
being unusable. The second conversion performed after power up, however, is valid, as shown in Figure 22.
If CS is brought back high before the 10th falling edge of SCLK, the device returns to shutdown mode. This is
done to avoid accidentally entering normal mode as a result of noise on the CS line. To exit shutdown mode and
remain in normal mode, CS must be kept low until after the 10th falling edge of SCLK. The ADC is fully powered
up after 16 SCLK cycles.