ADS7056 Datasheet, PDF (17/38 Pages) Texas Instruments – Ultra-Low Power, Ultra-Small Size, 14-Bit, High-Speed SAR ADC

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ADS7056
SBAS769 – MARCH 2017
Feature Description (continued)
8.3.2 Reference
The device uses the analog supply voltage (AVDD) as the reference voltage for the analog-to-digital conversion.
During the conversion process, the internal capacitors are switched to the AVDD pin as per the successive
approximation algorithm. As shown in Figure 37, a 3.3-µF (C_AVDD), low equivalent series resistance (ESR)
ceramic capacitor is recommended to be placed between the AVDD and GND pins. The decoupling capacitor
provides the instantaneous charge required by the internal circuit during the conversion process and maintains a
stable dc voltage on the AVDD pin.
See the Power Supply Recommendations and Layout Example sections for component recommendations and
layout guidelines.
CAVDD
CDVDD
AVDD
GND
DVDD
Figure 37. Reference for the Device
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