BC352239A Datasheet, PDF (92/116 Pages) List of Unclassifed Manufacturers – BlueCore 3-Multimedia External

Device Terminal Descriptions
8.8.22 IEC 60958 Interface
The IEC 60958 interface is a digital audio interface that uses bi-phase coding to minimise the DC content of the
transmitted signal and allows the receiver to decode the clock information from the transmitted signal. The
IEC 60958 specification is based on the two industry standards AES/EBU and the Sony and Philips interface
specification SPDIF. The interface is compatible with IEC 60958-1, IEC 60958-3 and IEC 60958-4⁽¹⁾.
Note:
(1) _{Subject to firmware support; contact CSR for current status.}
The SPDIF interface signals are SPDIF_IN and SPDIF_OUT and are shared on the PCM interface pins as shown
in Figure 5.1. The input and output stages of the SPDIF pins can interface either 75Ω coaxial cable with an RCA
connector or there is an option to use an optical link that uses Toslink optical components. Typical output and
input stage interfaces for the coaxial solution interface is shown in Figure 8.25 and Figure 8.26 and the equivalent
optical solution is shown in Figure 8.27 and Figure 8.28.
SPDIF_OUT
74HCU04
74HCU04
74HCU04
10nF
100Ω
75Ω
RCA
Connector
SPDIF Output
74HCU04
Figure 8.25: Example Circuit for SPDIF Interface with Coaxial Output
Note:
The 100Ω and 75Ω resistors are dependent on the supply voltage and therefore subject to change
10KΩ
RCA
Connector _10nF
SPDIF Input
100Ω
SPDIF_IN
75Ω
74HCU04
74HCU04
Figure 8.26: Example Circuit for SPDIF Interface with Coaxial Input
BC352239A-ds-001Pc
© Cambridge Silicon Radio Limited 2004
Production Information
Page 92 of 116