CS8416-CSZ datasheet(49/60 Pages) CIRRUS

49 / 60 page

DS578F3

CS8416

16.EXTERNAL AES3/SPDIF/IEC60958 RECEIVER COMPONENTS

16.1 AES3 Receiver External Components

The CS8416 AES3 receiver is designed to accept both the professional and consumer interfaces. The dig-

ital 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 impedance, a 110

Ω resistor should be placed across the receiver

terminals to match the line impedance, as shown in Figures 16 and 17. Although transformers are not re-

quired by the AES specification, they are strongly recommended.

If some isolation is desired without the use of transformers, a 0.01

μF capacitor should be placed in series

with each input pin (RXP[7:0] and RXN) as shown in Figure 17. However, if a transformer is not used, high

frequency energy could be coupled into the receiver, causing degradation in analog performance.

Figures 16 and 17 show an optional (recommended) DC blocking capacitor (0.1

μF to 0.47 μF) in series with

the cable input. This improves the robustness of the receiver, preventing the saturation of the transformer,

or any DC current flow, if a DC voltage is present on the cable.

In the case of the consumer interface, the standards call for an unbalanced circuit having a receiver imped-

ance of 75

Ω ±5%. The connector for the consumer interface is an RCA phono socket. The receiver circuit

for the consumer interface is shown in Figure 18. An implementation of the Input S/PDIF Multiplexer using

the consumer interface is shown in Figure 19.

The circuit shown in Figure 20 may be used when external RS422 receivers, optical receivers or other

TTL/CMOS logic outputs drive the CS8416 receiver section.

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 advantageous to have the ground

of two boxes held to the same potential, and the cable shield might be depended upon to make that electrical

connection. Generally, it is a good idea to provide the option of grounding or capacitively coupling the shield

to the chassis.

16.2 Isolating Transformer Requirements

Please refer to the application note AN134: AES and SPDIF Recommended Transformers for resources on

transformer selection.

XLR

Twisted

Pair

110

CS8416

RXP0

RXN

* See Text

XLR

Twisted

Pair

110

CS8416

RXP0

RXN

0.01 F

*See Text

Figure 16. Professional Input Circuit

Figure 17. Transformerless Professional Input Circuit

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