CS61884 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS61884

Octal T1/E1/J1 Line Interface Unit

Cirrus Logic 

CS61884

18. APPLICATIONS

+3.3V

RGND

0.1 µF

Note 1

0.1 µF

Note 1

++

TGND

68 µF

Note 2

+3.3V

0.1 µF +

GNDIO

100 Ω +3.3V

75 Ω

Cable

NC

120 Ω

Cable

RV+

VCCIO

TV+

R TIP

0.1 µF

R RIN G

CS61884

One Channel

TRIN G

T TIP

R1

R2

T1 1:2

RECEIVE

LINE

T2 1:2

TRANSMIT

LINE

CBLSEL

13.3k Ω

REF

GND

Component

R1 (Ω)

R2 (Ω)

T1/J1 100Ω

Twisted Pair

Cable

15

15

E1 75Ω

Coaxial

Cable

15

15

E1 120Ω

Twisted Pair

Cable

15

15

Notes:1) Required Capacitor between each TV+, RV+, VCCIO and TGND, RGND, GNDIO respec-

tively.

2) Common decoupling capacitor for all TVCC and TGND pins.

Figure 17. Internal RX/TX Impedance Matching

DS485F1

51

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