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9.1.4 Power and Ref Tab
On this tab (shown in Figure 28), the power-supply mode for the ADS1258 may be selected. As explained
earlier, the bipolar mode requires both a +5V and a –5V power supply and the appropriate jumper
selections on the MMB0, so bipolar mode cannot be selected here if you are using an ac adaptor. With the
appropriate power connections, the Power supply can be set to either Unipolar or Bipolar.
The ADS1258 Idle mode can be selected to be either Standby (low power, fast startup), or Sleep (lowest
power).
The VREF Source voltage can either come from an External voltage or you can choose DAC and specify
the VREF voltage (up to 5V).
When enabled, the Sensor Bias Current Sources (SBCS) can be set for either 1.5μA or 24μA.
Figure 28. Power and Reference Settings
The Low Supply indicator will indicate that the analog supply voltage (AVDD – AVSS) is less than about
4.3V.
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SBAU126C– May 2007– Revised May 2011 ADS1158EVM, ADS1258EVM, ADS1158EVM-PDK, and ADS1258EVM-PDK
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