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CS8420 Scheda tecnica(PDF) 11 Page - Cirrus Logic |
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CS8420 Scheda tecnica(HTML) 11 Page - Cirrus Logic |
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11 / 80 page  CS8420 DS245PP2 11 3. GENERAL DESCRIPTION The CS8420 is a fully asynchronous sample rate converter plus AES3 transceiver intended to be used in digital audio systems. Such systems include digital mixing consoles, effects processors, tape re- corders and computer multimedia systems. The CS8420 is intended for 16, 20, and 24-bit applica- tions where the input sample rate is unknown, or is known to be asynchronous to the system sample rate. On the input side of the CS8420, AES3 or a 3-wire serial format can be chosen. The output side pro- duces both AES3 and a 3-wire serial format. An I2C/SPI compatible microcontroller interface al- lows full block processing of channel status and user data via block reads from the incoming AES3 data stream and block writes to the outgoing AES3 data stream. The user can also access information decoded from the input AES3 data stream, such as the presence of non-audio data and pre-emphasis, as well as control the various modes of the device. For users who prefer not to use a micro-controller, six hardware modes have been provided, docu- mented towards the end of this data sheet. In these modes, flexibility is limited, with pins providing some programmability. When used for AES3 in, AES3 out applications, the CS8420 can automatically transceive user data that conforms to the IEC60958 recommended format. The CS8420 also allows access to the relevant bits in the AES3 data stream to comply with the serial copy management system (SCMS). The diagram on the cover of this data sheet shows the main functional blocks of the CS8420. Figure 5 shows the supply and external connections to the device. Familiarity with the AES3 and IEC60958 specifi- cations are assumed throughout this document. The Application Note: “Overview of Digital Audio In- terface Data Structures”, contains a tutorial on dig- ital audio specifications. The paper “An Understanding and Implementation of the SCMS Serial Copy Management System for Digital Audio Transmission”, by Clif Sanchez, is an excellent tu- torial on SCMS. It may be obtained from Crystal Semiconductor, or from the AES. To guarantee system compliance, the proper stan- dards documents should be obtained. The latest AES3 standard should be obtained from the Audio Engineering Society or ANSI, the latest IEC60958 standard from the International Electrotechnical Commission and the latest EIAJ CP-1201 standard from the Japanese Electronics Bureau. |
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