CS8406-CS datasheet(39/43 Pages) CIRRUS

39 / 43 page

CS8406

DS580F1

14.APPENDIX A: EXTERNAL AES3/SPDIF/IEC60958 TRANSMITTER

COMPONENTS

This section details the external components required to interface the AES3 transmitter to cables

and fiber-optic components.

14.1 AES3 Transmitter External Components

The output drivers on the CS8406 are designed to drive both the professional and consumer in-

terfaces. The AES3 and IEC60958-4 specifications call for a balanced output drive of 2-7 V peak-

to-peak into a 110

Ω ± 20% load with no cable attached. Using the circuit in Figure 13, the output

of the transformer is short-circuit protected, has the proper source impedance, and provides a

5 V peak-to-peak signal into a 110

Ω load. Lastly, the two output pins should be attached to an

XLR connector with male pins and a female shell, and with pin 1 of the connector grounded.

In the case of consumer use, the IEC60958-3 specification calls for an unbalanced drive circuit

with an output impedance of 75

Ω ± 20% and a output drive level of 0.5 V peak-to-peak ± 20%

when measured across a 75

Ω load using no cable. The circuit shown in Figure 14 only uses the

TXP pin and provides the proper output impedance and drive level using standard 1% resistors.

If VL is set to +3.3 V, change 374

Ω to 243 Ω and change 90.9 Ω to 107 Ω. The connector for a

consumer application would be an RCA phono socket. This circuit is also short circuit protected.

The TXP pin may be used to drive TTL or CMOS gates as shown in Figure 15. This circuit may

be used for optical connectors for digital audio since they usually have TTL or CMOS compatible

inputs. This circuit is also useful when driving multiple digital audio outputs since RS422 line driv-

ers have TTL compatible inputs.

14.2 Isolating Transformer Requirements

Please refer to the application note AN134:

AES and SPDIF Recommended Transformers for re-

sources on transformer selection.

374-R

TXP

90.9

Ω

TXP

TXN

RCA

Phono

CS8406

110-(R

TXP+RTXN)

TXP

TXN

XLR

CS8406

Figure 13. Professional Output Circuit

Figure 14. Consumer Output Circuit (VL = 5.0 V)

TXP

TXN

TTL or

CMOS Gate

CS8406

Figure 15. TTL/CMOS Output Circuit

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