The main difference between the AD9887 and AD9887A is that the AD9887A adds HDCP-related features, such as HDCP key detection, HDCP address, HDCP slave port address, MDA/MCL three-state control, etc. In addition, the AD9887A has two additional control pins, which are used to control Pin 49 function (CTL3 or MCL) and MDA/MCL three-state control.
This document outlines the specific differences between the AD9887 and AD9887A integrated circuits. It covers register bit definitions for HDCP support, software configuration changes required for optimal performance, and PCB layout considerations when transitioning from the original part to the 'A' version.
Key areas of difference include the analog interface operating frequency (up to 170 MHz for AD9887A), DVI interface speed (165 MHz for AD9887A), and input bandwidth (500 MHz for AD9887A). The note also provides a table of specific register values that must be updated in the design.
The AD9887A analog interface is designed to operate up to 170 MHz.
The AD9887 analog interface is designed for 140 MHz operation.
The AD9887A input bandwidth is 500 MHz.
The AD9887 input bandwidth is 330 MHz.