CS61884-IB View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS61884-IB

Octal T1/E1/J1 Line Interface Unit

Cirrus Logic 

CS61884

RGND

+3.3V

+

0 .1µ F

GNDIO

120 Ω

Cable

NC

100 Ω

75 Ω

Cable

GND

+3.3V

0.1 µF

Note 1

RV+

VCCIO

0.1 µF

Note 1

+ + 68 µF

Note 2

TGND

TV+

1k Ω

R TIP

0.1 µF

CS61884

One Channel

R RIN G

1k Ω

T RIN G

T TIP

CBLSEL

13.3k Ω

REF

R1

RECEIVE

LINE

R2

T1 1:2

T2 1:2

TRANSMIT

LINE

GND

Component

R1 (Ω)

R2 (Ω)

T1/J1 100Ω

Twisted Pair

Cable

12.5

12.5

E1 75Ω

Coaxial

Cable

9.31

9.31

E1 120Ω

Twisted Pair

Cable

15

15

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

respectively.

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

Figure 18. Internal TX, External RX Impedance Matching

52

DS485F1

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