ADS7044_16 Datasheet, PDF (15/41 Pages) Texas Instruments – Ultra-Low Power, Ultra-Small Size, 12-Bit, 1-MSPS, SAR ADC

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8 Detailed Description
ADS7044
SBAS682D – NOVEMBER 2014 – REVISED DECEMBER 2015
8.1 Overview
The ADS7044 is an ultralow-power, ultra-small analog-to-digital converter (ADC) that supports a wide analog
input range. The analog input range for the device is defined by the AVDD supply voltage. The device samples
the input voltage across the AINP and AINM pins on the CS falling edge and starts the conversion. The clock
provided on the SCLK pin is used for conversion and data transfer. During conversions, both the AINP and AINM
pins are disconnected from the sampling circuit. After the conversion completes, the sampling capacitors are
reconnected across the AINP and AINM pins and the device enters acquisition phase.
The device has an internal offset calibration. The offset calibration can be initiated by the user either on power-up
or during normal operation; see the Offset Calibration section for more details.
The device also provides a simple serial interface to the host controller and operates over a wide range of digital
power supplies. The device requires only a 16-MHz SCLK for supporting a throughput of 1 MSPS. The digital
interface also complies with the JESD8-7A (normal range) standard. The Functional Block Diagram section
provides a block diagram of the device.
8.2 Functional Block Diagram
AINP
AINM
AVDD
GND
Offset
Calibration
CDAC
Comparator
DVDD
CS
SCLK
Serial
Interface _SDO
SAR
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