SLAU150A December 2004 – October 2021 ADS7881 , ADS7891
The ADS7881 and ADS7891 ADCs have both a positive and negative analog input pin. The negative input pin, which has a range of –200 mV up to 200 mV is shorted on the board. A signal for the positive input pin can be applied at connector P1, pin 2 (as shown in Table 1-2) or at the center pin of the SMA connector J2.
| Connector.Pin#(1) | Signal | Description |
|---|---|---|
| P1.2 | +IN | Noninverting input channel |
| P1.4 | Reserved | — |
| P1.6 | Reserved | — |
| P1.8 | Reserved | — |
| P1.10 | Reserved | — |
| P1.12 | Reserved | — |
| P1.14 | Reserved | — |
| P1.16 | Reserved | — |
| P1.18 | Reserved | — |
| P1.20 | REF+ | External reference input |