ADS7029-Q1 Datasheet, PDF (13/32 Pages) Texas Instruments – Small-Size, Low-Power, 8-Bit, 2-MSPS, SAR ADC

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8.2 Functional Block Diagram
AINP
AINM
AVDD
GND
Offset
Calibration
CDAC
Comparator
±
ADS7029-Q1
SBAS811 – JANUARY 2017
DVDD
CS
Serial
Interface
SCLK
SDO
SAR
8.3 Feature Description
8.3.1 Reference
The device uses the analog supply voltage (AVDD) as a reference, as shown in Figure 30. The AVDD pin is
recommended to be decoupled with a 3.3-µF, low equivalent series resistance (ESR) ceramic capacitor.. The
AVDD pin functions as a switched capacitor load to the source powering AVDD. The decoupling capacitor
provides the instantaneous charge required by the internal circuit and helps in maintaining a stable dc voltage on
the AVDD pin. The AVDD pin is recommended to be powered with a low output impedance and low-noise
regulator (such as the TPS73230).
3.3 µF
AINP
AINM
AVDD
GND
Offset
Calibration
CDAC
Comparator
±
DVDD
CS
Serial
Interface
SCLK
SDO
SAR
Figure 30. Reference for the Device
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