DIX4192IPFB datasheet(56/71 Pages) TI2

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R1andR2areselectedtoachievethedesiredoutputvoltagelevelwhilemaintainingtherequired75

transmitteroutputimpedance.

TheTX+outputimpedanceisnegligible.

(a)Transformer-CoupledUnbalancedOutput

1:1

0.1 F

TX+

DigitalOutput

Unbalan

ced

(RCAorBNCconnector)

(b)UnbalancedOutputWithoutTransformer

0.1mF

TX+

DigitalOutput

Unbalan

ced

(RCAorBNCconnector)

1:1

0.1 F

TX+

TX-

XLR

DigitalOutput

110

alanced

110W

DIX4192

SBFS031F – FEBRUARY 2006 – REVISED SEPTEMBER 2016

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Application Information (continued)

Figure 77. Transformer-Coupled Balanced Output Interface

Unbalanced 75-

Ω coaxial cable interfaces are commonly employed in consumer and broadcast audio

applications. Designs with and without transformer line coupling may be used. Figure 78(a) shows the

recommended 75-

Ω transformer-coupled line driver interface, which shares many similarities to the balanced

design shown in Figure 77. Figure 78(b) shows the transformer-free line driver interface, which is commonly used

for S/PDIF consumer connections.

Figure 78. Unbalanced Line Output Interfaces

Optical interfaces using all-plastic fiber are commonly employed for consumer audio equipment where

interconnections are less than 10 m in length. Most optical transmitter modules used for a digital audio interface

operate from a single 3.3-V or 5-V supply and have a TTL-compatible logic input. The CMOS-buffered transmitter

output of the DIX4192, AESOUT (pin 34), is capable of driving the optical transmitter with VIO supply voltages

down to 3 V. If the VIO supply voltage is less than 3 V, then level translation logic is required to drive the optical

transmitter input. A good choice for this application is the Texas Instruments SN74AVC1T45 single bus

transceiver. This device features two power-supply rails, one for the input side and one for the output side. For

this application, the input side supply is powered from the VIO supply, while the output side is powered from a

3.3-V supply. This configuration will boost the logic high level to a voltage suitable for driving the TTL-compatible

input configuration. Figure 79 shows the recommended optical transmitter interface circuits.

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