DIX4192IPFB datasheet(55/71 Pages) TI2

55 / 71 page

SN74LVC1G125

orEquivalent

0.1mF

T RX+

ToRX-

From+5VLogic

(TTLorCMOS)

VDD33

SN74AVC1T45

orEquivalent

0.1mF

T RX+

ToRX-

From+1.8Vor+2.5V

CMOSLogic

+1.8Vor+2.5V

VDD33

(1)ToshibaTORX173,TORX176,TORX179,orequivalent.

+5V

SN74LVC1G125

orEquivalent

0.1mF

T RX+

ToRX-

All-Plastic

(5or10metersmaximum)

Optical

Receiver

(1)

VDD33

DIX4192

www.ti.com

SBFS031F – FEBRUARY 2006 – REVISED SEPTEMBER 2016

Product Folder Links: DIX4192

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Application Information (continued)

Figure 75. Interfacing to a 5-V Optical Receiver Module

The DIX4192 line receivers may also be driven directly from external logic or line receiver devices with TTL or

CMOS outputs. If the logic driving the line receiver is operated from 3.3 V, then logic level translation will not be

required. However, if the external logic is operated from a power-supply voltage that exceeds the maximum

VDD33 supply voltage of the DIX4192, or operates from a supply voltage lower than 3.3 V, then level translation

is required. Figure 76 shows the recommended logic level translation methods, using buffers and level

translators available from Texas Instruments.

Figure 76. CMOS and TTL Input Logic Interface

10.1.3 Transmitter Output Interfacing

This section details the recommended interfaces for the DIX4192 transmitter line driver and CMOS-buffered

outputs. Balanced and unbalanced line interfaces, in addition to optical transmitter and external logic interfacing,

will be discussed.

For professional digital audio interfaces, 110-

Ω balanced line interfaces are either required or preferred.

Transformer coupling is commonly employed to provide isolation and to improve common-mode noise

performance. Figure 77 shows the recommended transformer-coupled balanced line driver interface for the

DIX4192. The transformer is specified for a 1:1 turn ratio, and must exhibit low inter-winding capacitance for best

performance. To eliminate residual DC bias, a 0.1-μF capacitor is used for AC-coupling the transformer to the

line driver outputs. The coupling capacitor must be a surface-mount ceramic chip type with an X7R or C0G

dielectric.

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