Although the ADS1000-Q1 has a fully differential input, the device can easily measure single-ended signals. A simple single-ended connection scheme is shown in Figure 8-4. The ADS1000-Q1 is configured for single-ended measurement by grounding either of the input pins, usually V_IN–, and applying the input signal to V_IN+. The single-ended signal can range from –0.2 V to AVDD + 0.2 V. The ADS1000-Q1 loses no linearity anywhere in the input range. Negative voltages cannot be applied to this circuit because the ADS1000-Q1 inputs can only accept positive voltages.

Figure 8-4 Measuring Single-Ended Inputs

The ADS1000-Q1 input range is bipolar differential with respect to the reference, that is, ±V_DD. The single-ended circuit shown in Figure 8-4 covers only half the ADS1000-Q1 input scale because this circuit does not produce differentially negative inputs; therefore, one bit of resolution is lost.