STA120D View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STA120D

DIGITAL AUDIO INTERFACE RECEIVER

STMicroelectronics 

STA120

Grounding the shield of the cables a tricky issue. In the configuration of systems, it is important to avoid

ground loops and DC current flowing down the shield of the cable that could results when boxes with dif-

ferent 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 help to the same potential, and the cable shield might be depended upon

to make that electrical connection.

Generally, it may be a good idea to provide the option of grounding or capacitively coupling to ground with

a "ground-lift" circuit.

Consumer Interface

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

pedance of 75Ω ±5%. The connector for the consumer interface is an RCA phono plug (fixed socket de-

scribed in Table IV of IEC268-11). The receiver circuit for the consumer interface is shown in Figure 9.

Figure 9. Consumer Input Circuit

RCA Phono

75Ω

coax

75Ω

100nF

RXP

100nF

STA120

RXN

D02AU1387

TTL/CMOS Levels

The circuit shown in Figure 10 may be used when external RS422 receivers or TTL/CMOS logic drive the

STA120 receiver section.

Figure 10. TTL/CMOS Interface

100nF

RXP

100nF

STA120

RXN

D98AU986C

13/15

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