CS8422 datasheet(65/82 Pages) CIRRUS

65 / 82 page

DS692PP1

CS8422

boxes held to the same potential, and the cable shield might be depended upon to make that electrical con-

nection. Generally, it is a good idea to provide the option of grounding or capacitively coupling the shield to

the chassis.

12.3.1

Attenuating Input signals

The input signals to the RX, RXP, and RXN pins in all modes of operation are limited to amplitudes equal

to, or less than +3.3 V. In some cases it may be necessary to attenuate the input signal so the input to the

device is within the valid operating range. Figures 31 and 32 illustrate how this should be done for both sin-

gle-ended and differential inputs. In both cases, equations (1) and (2) must be satisfied simultaneously.

XLR

110

Ω

Twisted

Pair

110

Ω

CS8422

RXP

RXN

* See Text

XLR

110

Ω

CS8422

RXP0

RXN0

0.01 F

*See Text

110

Ω

Twisted

Pair

Figure 26. Professional Input Circuit – Differential

Mode

Figure 27. Transformerless Professional Input Cir-

cuit – Differential Mode

RX3

RX0

RX2

Ω

.01

µF

.01

µF

.01

µF

Ω

Coax

Ω

Coax

Ω

Coax

CS8422

RCA Phono

RXP

RXN

CS8422

Coax

Ω

0.01

µF

0.01

µF

Figure 28. S/PDIF MUX Input Circuit – Single-Ended

Receiver Mode 1 Single-Ended Input Circuit –

Differential Mode

RXP

RXN

CS8422

0.01

µF

0.01

µF

TTL/CMOS

RX3

CS8422

TTL/CMOS

RX0

Figure 29. S/PDIF MUX Input Circuit – Digital Mode

Figure 30. TTL/CMOS Input Circuit – Differential

Mode

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