CS8416-CS datasheet(45/48 Pages) CIRRUS

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CS8416

DS578PP2

14 APPENDIX A: EXTERNAL

AES3/SPDIF/IEC60958 RECEIVER

COMPONENTS

14.1

AES3 Receiver External Components

The CS8416 AES3 receiver is designed to accept

both the professional and consumer interfaces. The

digital audio specifications for professional use call

for a balanced receiver, using XLR connectors,

with 110

Ω ±20% impedance. The XLR connector

on the receiver should have female pins with a male

shell. Since the receiver has a very high input im-

pedance, a 110

Ω resistor should be placed across

the receiver terminals to match the line impedance,

as shown in Figure 14 and Figure 15. Although

transformers are not required by the AES, they are,

however, strongly recommended.

If some isolation is desired without the use of trans-

formers, a 0.01

µF capacitor should be placed in se-

ries with each input pin (RXP0 and RXN0) as

shown in Figure . However, if a transformer is not

used, high frequency energy could be coupled into

the receiver, causing degradation in analog perfor-

mance.

Figure 14 and Figure 15 show an optional DC

blocking capacitor (0.1

µFto 0.47 µF) in series with

the cable input. This improves the robustness of the

receiver, preventing the saturation of the trans-

former, or any DC current flow, if a DC voltage is

present on the cable.

In the configuration of systems, it is important to

avoid ground loops and DC current flowing down

the shield of the cable that could result when boxes

with different ground potentials are connected.

Generally, it is good practice to ground the shield

to the chassis of the transmitting unit, and connect

the shield through a capacitor to chassis ground at

the receiver. However, in some cases it is advanta-

geous to have the ground of two boxes held to the

same potential, and the cable shield might be de-

pended upon to make that electrical connection.

Generally, it may be a good idea to provide the op-

tion of grounding or capacitively coupling the

shield to the chassis.

In the case of the consumer interface, the standards

call for an unbalanced circuit having a receiver im-

pedance of 75

Ω ±5%. The connector for the con-

sumer interface is an RCA phono socket. The

receiver circuit for the consumer interface is shown

in Figure . Figure shows an implementation of the

Input S/PDIF Multiplexer using the consumer in-

terface.

The circuit shown in Figure maybeusedwhenex-

ternal RS422 receivers, optical receivers or other

TTL/CMOS logic outputs drive the CS8416 receiv-

er section.

14.2

Isolating Transformer Requirements

Please refer to the application note AN134: AES

and SPDIF Recommended Transformers for re-

sources on transformer selection.

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