ADS8512 Datasheet, PDF (13/32 Pages) Texas Instruments – 12-Bit, 40-kSPS, Low Power Sampling ANALOG-TO-DIGITAL CONVERTER with Internal Reference and Serial Interface

ADS8512
www.ti.com ...................................................................................................................................................................................................... SLAS485 – JUNE 2008
Even though the CONV input is ignored while a conversion is in progress, this input should be held static during
the conversion period. Transitions on this digital input can easily couple into sensitive analog portions of the
converter, adversely affecting the conversion results (see the Sensitivity to External Digital Signals section of this
data sheet for more information).
Ideally, the CONV input should go low and remain low throughout the conversion. It should return high sometime
after BUSY goes high. In addition, it should be high before the start of the next conversion for a minimum time
period given by t₅. This period ensures that the digital transition on the CONV input does not affect the signal that
is acquired for the next conversion.
An acceptable alternative is to return the CONV input high as soon after the start of the conversion as possible.
For example, a negative going pulse 100ns wide would make a good CONV input signal. It is strongly
recommended that from time t₂ after the start of a conversion until BUSY rises, the CONV input should be held
static (either high or low). During this time, the converter is more sensitive to external noise.
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