SRC4382IPFBT datasheet(43/85 Pages) TI2

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RECEIVER INPUT INTERFACING

(1)Inserta0.1 Fcap

common-modeDCvoltage.

acitorwhenblocking

1:1

110W

0.1 F

ToRX+

T R

XLR

DigitalInput

110

alanced

(1)

(1)Inserta0.1 Fcap

common-modeDC

acitorwhenblocking

components.

1:1

75W

0.1 F

ToRX+

ToRX-

Dig ta

lInput

Unbalan

ced

(RCAorBNCconnector)

(1)

(a)Transformer-CoupledUnbalancedLineInterface

75W

0.1 F

ToRX+

ToRX-

DigitalInput

Unbalan

ced

(RCAorBNCconnector)

(b)UnbalancedLineInterfaceWithoutTransformer

SRC4382

SBFS030C – JANUARY 2006 – REVISED SEPTEMBER 2007

This section details the recommended interfaces for the SRC4382 line receiver inputs. Balanced and unbalanced

line interfaces, in addition to optical receiver 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 rejection.

Figure 83 shows the recommended transformer-coupled balanced line receiver interface for the SRC4382. The

transformer is specified for a 1:1 turn ratio, and should exhibit low inter-winding capacitance for best

performance. Due to the DC bias on the line receiver inputs, 0.1

μF capacitors are utilized for AC-coupling the

transformer to the line receiver inputs. On the line side of the transformer, an optional 0.1

μF capacitor is shown

for cases where a DC bias may be applied at the transmitter side of the connection. The coupling capacitors

should be surface-mount ceramic chip type with an X7R or C0G dielectric.

Figure 83. Transformer-Coupled Balanced Input 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 utilized. Figure 84(a) shows the

recommended 75

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

shown in Figure 83. Once again, the transformer provides isolation and improved noise rejection. Figure 84(b)

shows the transformer-free interface, which is commonly used for S/PDIF consumer connections.

Figure 84. Unbalanced Line Input Interfaces

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