Datasheet

Digital Interface

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Figure 2. ADS855xEVM External Reference Circuit

2 Digital Interface

The ADS8556 EVM is designed for easy interfacing with the 5-6K Interface Board for use with the C5000

and C6000 series DSK platforms from Texas Instruments. The ADS855xEVM features common 0.1 inch

male (top side) and female (bottom side) connectors to all analog inputs and digital control functions

making it easy to use with common ribbon cables and laboratory prototyping equipment. The details of the

digital portion of the EVM are broken into the following sections which cover the power supply

requirements and the interface/control requirements.

2.1 Digital Power – Buffer I/O Supply

The Buffer I/O Supply of the ADS8556 is to be powered from an external source via J3. Connector J3 has

a +3.3V and +5V digital supply defined on pins 9 and 10 (respective) as per the TI Modular EVM Design

Guideline (TI Document SLAA185, see Table 3). Jumper JP4 on the EVM allows the user to select the

default +5V or +3.3V for the device BVDD source. This voltage is also applied to the remaining digital

circuitry on the EVM.

ADS855xEVM SLAU298–November 2009

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