6.10 Interface Transceiver Chips

6.10 Interface Transceiver Chips

A number of dedicated ICs are now available for receiving and transmitting standard two-channel interface data, many operating in either consumer or professional modes. Such chips are large-scale integrated circuits (LSIs) which take care of low jitter clock recovery, automatic CRCC checking and generation, automatic sample rate selection and channel status control, among other features. Examples of such devices are the Cirrus Logic (formerly Crystal Semiconductors) series including the CS8427 transceiver chip that will transmit and receive consumer or professional signals at sampling frequencies up to 96 kHz. In such chips the clock recovery is carefully controlled in order to extract a low jitter clock from the interface signal for use by the audio system. The interface between two-channel transceiver chips and the internal signal processing of the equipment is normally in a serial form that can be accepted directly by DSP devices such as the Motorola DSP 56000.

Multichannel interfacing using MADI is based on the FDDI (Fibre Distributed Digital Interface) standard and requires the use of so-called 'TAXI' chips designed by AMD (Advanced Micro Devices). The Am7968 and 7969 chips can be used to handle transmission and reception of the high bit rate data from either optical fibre or copper cables, transferring this data normally in parallel form to and from the internal signal processing of the device in question in order to achieve the high transfer rate necessary.



Digital Interface Handbook
Digital Interface Handbook, Third Edition
ISBN: 0240519094
EAN: 2147483647
Year: 2004
Pages: 120

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