Audio And Power; Interface Support - Motorola ASTRO XTS 5000 Detailed Service Manual

2-8
2.5.2

Audio and Power

The audio and power section consists of the GCAP II IC, the 5 Vdc regulator, the audio pre-amplifier,
the audio power amplifier, and the dual EEPOT.
The GCAP II IC contains a CODEC, amplification, filtering, and multiplexing capability for receive
and transmit audio, voltage regulators, an analog-to-digital converter (ADC), and a real-time clock
(RTC). The GCAP II IC is programmed by the Patriot IC.
The audio pre-amplifier and the audio power amplifier condition the received audio signal before
being routed to the speaker. The dual EEPOT sets the gain of the microphone signal. These devices
are programmed by the Patriot IC.
2.5.3

Interface Support

This interface support section consists of the Flipper IC, ESD protection devices, and side connector
interface circuitry.
The Flipper IC contains a USB transceiver, switching logic between RS232 and boot data path, One-
Wire side connector support, and several clock generators. The Flipper IC is programmed by the
Patriot IC.
ESD protection devices include zener diodes and low-capacitance ESD suppressors. Side connector
interface circuitry includes current-limiting resistors and noise-suppressing shunt capacitors.
April 15, 2002
Overall Characteristics: VOCON Board Overview
68P81094C31-O