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Data Sheet

AD4680/AD4681

Rev. 0 | Page 19 of 29

RESOLUTION BOOST

The default conversion result output data size is 16 bits for the

AD4680/AD4681. When the on-chip oversampling function is

enabled, the performance of the ADC can exceed 16 bits. To

accommodate the performance boost achievable, it is possible to

enable an additional two bits of resolution. If the RES bit in the

CONFIGURATION1 register is set to Logic 1 and the AD4680/

AD4681 are in a valid oversampling mode, the conversion

result size is 18 bits. In this mode, 18 SCLK cycles are required

to propagate the data for the AD4680/AD4681.

ALERT

The alert functionality is an out of range indicator and can be

used as an early indicator of an out of bounds conversion

result. An alert event triggers when the conversion result value

HIGH_THRESHOLD register or falls below the alert low limit

value in the ALERT_LOW_THRESHOLD register. The

ALERT_HIGH_THRESHOLD register and the ALERT_

LOW_THRESHOLD register are common to all ADCs. When

setting the threshold limits, the alert high threshold must always

be greater than the alert low threshold. Detailed alert

information is accessible in the ALERT register.

The ALERT register contains two status bits per ADC, one

corresponding to the high limit, and the other to the low limit.

A logical OR of alert signals for all ADCs creates a common alert

value. This value can be configured to drive out on the ALERT

function of the SDOB/ALERT pin. The SDOB/ALERT pin is

configured as ALERT by configuring the following bits in

CONFIGURATION1 and the CONFIGURATION2:



Set the SDO bit to 1.



Set the ALERT_EN bit to 1.



Set a valid value to the ALERT_HIGH_THRESHOLD

The alert indication function is available in both rolling average

oversampling and in nonoversampling modes.

The ALERT function of the SDOB/ALERT pin is updated at the

end of a conversion. The alert indication status bits in the

ALERT register are updated as well and must be read before the

end of the next conversion. The ALERT function of the

SDOB/ALERT pin is cleared with a falling edge of CS. Issuing a

software reset also clears the alert status in the ALERT register.

SDOA

CONV

ACQ

CONV

ACQ

CONV

ACQ

CONV

ACQ

INTERNAL

ALERT

tALERTS

tALERTC

EXCEEDS THRESHOLD

Figure 36. Alert Operation

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