The MC145503 has been discontinued. Suggested replacement: none.
The MC145500, MC145501, MC145502, MC145503, and MC145505 are all
per channel PCM Codec–Filter mono–circuits. These devices perform the voice
digitization and reconstruction as well as the band limiting and smoothing
required for PCM systems.
The MC145503 is a general purpose device that is offered in a 16-pin package.
It is designed to operate in both synchronous and asynchronous applications and
contains an on-chip precision reference voltage.
These devices are pin–for–pin replacements for Motorola’s first generation of
MC14400/01/02/03/05 PCM mono–circuits and are upwardly compatible with
the MC14404/06/07 codecs and other industry standard codecs. They also
maintain compatibility with Motorola’s family of MC33120 and MC3419 SLIC
The MC145500 family of PCM Codec–Filter mono–circuits utilizes CMOS
due to its reliable low–power performance and proven capability for complex
analog/digital VLSI functions.