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2.1.2 Voltage Reference
The ADS9227 uses an internal 4.096V reference voltage, which can be measured on the REFIO pin when
configured as an output (default). For applications which require improved drift performance, configure the
REFIO pin as an input and apply an external reference voltage to the pin.
The ADS9227EVM include a provision for evaluating the REF7040 reference IC. The REF70xx family of high
precision series voltage references offers the industry's lowest noise (0.23ppm
coefficient (2ppm/°C), and high accuracy (±0.025%). In addition, these precision reference devices feature high
PSRR, low drop-out voltage and excellent load and line regulation to help meet strict transient requirements. The
REF7040 on the EVM is the 4.096V output voltage option. To connect the REF7040 to the ADS9227, configure
the REFIO pin as an input via the GUI and then install a shunt on jumper JP2 in the [1-2] position.
6
ADS9227 Evaluation Module
Figure 2-4. External Reference Voltage Using REF7040
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), very low temperature drift
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SBAU439 – JANUARY 2024
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