The ADS78x1EVM showcases the 12-bit, 4-MSPS (ADS7881) and 14-bit, 3-MSPS (ADS7891) ADCs. The ADS7881 and ADS7891 devices include a capacitor-based successive-approximation register (SAR) ADC with inherent sample and hold. These devices offer either a 12-bit or 14-bit parallel interface. Both devices offer byte mode operation that enables easy interface with 8-bit processors. They also have a pseudo-differential input stage and a 2.5-V internal reference.

This evaluation module serves as a reference design and a low-cost method to test these converters in the end application. The following sections describe the pin outs of the various analog, power, and digital connectors and power requirements.

Table 1-1 lists documents related to the ADS78x1EVM.

The ADS78x1EVM includes the following features:

• Full-featured evaluation board for the high-speed, SAR-type ADS7881(12-bit, 4-MSPS) or ADS7891(14-bit, 3-MSPS) single-channel, parallel interface ADCs
• Onboard signal conditioning
• Onboard reference
• Input and output digital buffers
• Onboard decoding for stacking multiple EVMs