DIX4192IPFBG4 datasheet(29/64 Pages) TI1

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VDD33

0.1 F

ToRX+

ToRX-

All-Plastic

(5or10metersmaximum)

(1)ToshibaTORX141orequivalent.

Optical

Receiver

(1)

(1)ToshibaTORX173,TORX176,TORX179,orequivalent.

+5V

SN74LVC1G125

orEquivalent

0.1mF

T RX+

ToRX-

All-Plastic

(5or10metersmaximum)

Optical

Receiver

(1)

VDD33

DIX4192

SBFS031C – JANUARY 2006 – REVISED JUNE 2006

APPLICATIONS INFORMATION (continued)

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

interconnections are less than 10m in length. Optical receiver modules utilized for a digital audio interface

operate from either a single +3.3V or +5V supply and have a TTL-, CMOS-, or low-voltage CMOS-compatible

logic output. Interfacing to +3.3V optical receivers is straightforward when the optical receiver supply is powered

from the DIX4192 VDD33 power source, as shown in Figure 27. For the +5V optical receivers, the output high

logic level may exceed the DIX4192 line receiver absolute maximum input voltage. A level translator is required,

placed between the optical receiver output and the DIX4192 line receiver input. Figure 28 shows the

recommended input circuit when interfacing a +5V optical receiver to the DIX4192 line receiver inputs. The

Texas Instruments SN74LVC1G125 single buffer IC is operated from the same +3.3V supply used for DIX4192

VDD33 supply. This buffer includes a +5V tolerant digital input, and provides the logic level translation required

for the interface.

Figure 27. Interfacing to a +3.3V Optical Receiver Module

Figure 28. Interfacing to a +5V Optical Receiver Module

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