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CAP3001A Datasheet(PDF) 4 Page - Micronas |
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CAP3001A Datasheet(HTML) 4 Page - Micronas |
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4 / 37 page  CAP 3001 A MICRONAS INTERMETALL 4 Car Audio Processor 1. Introduction The CAP 3001 A Car Audio Processor presents the one- chip solution for a highly integrated car radio concept. It is housed in a 68-pin Plastic Leaded Chip Carrier Pack- age. The CAP 3001 A Car Audio Processor is a new CMOS processor to be used for car radio systems. The application consists essentially of the following components: – conventional FM tuner, FM–IF stage and FM demodu- lation – conventional AM tuner and IF stage – Car Audio Processor CAP 3001 A – microcontroller – analog audio sources – digital audio source 1.1. Features1) – stereo decoder – baseband audio processing – ignition noise canceller – synthesizer with fast tuning – AM tuning for 450 to 460 kHz or 10.7 MHz IF – AM IF processing (450 to 460 kHz) – AM stereo (C-QUAM) demodulation – ARI/RDS processing – PDAI Programmable Digital Audio Interface – A/D converter – D/A converter with eightfold oversampling filter. 2. Functional Description 2.1. Architecture The architecture of the CAP 3001 A processor com- prises three main function blocks: 2.1.1. DSP Block The DSP block consists of a “General Purpose16-Bit Digital Signal Processor” which handles 24 million in- structions per second. The data word length is 16 bits and the hardware multiplier operates with an initial word length of 16 @10 with a 20-bit result. The memory covers 256 @16)256@10 bit RAM and 2 k instruction ROM. 2.1.2. Digital Part A main portion consists of hardwired digital filters, such as decimation filters for the A/D converters and interpo- lation filters for D/A converters. The modulators for ARI/ RDS and pilot tone, as well as the complete circuitry for the ignition noise canceller are realized digitally. The log- ical conclusion for a higher integration is the incorpora- tion of the synthesizer for AM and FM tuning into this hardware block. Naturally the customary serial inter- faces for digital audio signals are also included. 2.1.3. Analog Part In the analog part various input switches, A/D converters and D/A converters are combined. Five A/D converters handle the conversion of analog signals into digital sig- nals. Two of these are specially designed for high quali- ty, one in particular for the conversion of an independent signal path for ARI/RDS signals and the remaining two to be used for the evaluation of analog signals of a lower quality standard (information on field strength and infor- mation from potentiometers). Two D/A converters, each equipped with an eightfold oversampling filter, generate analog output signals. These two outputs can be split up and distributed via four independently adjustable vol- ume control switches into four output stages. |
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