CS1880-IB View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS1880-IB

Octal E1 Line Interface Unit

Cirrus Logic 

CS61880

RGND

+3.3V

+

0 .1µ F

GNDIO

120 Ω

Cable

NC

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

CS61880

One Channel

R RIN G

1k Ω

T RIN G

T TIP

CBLSEL

13.3k Ω

REF

R1

RECEIVE

LINE

R2

T1 1:2

TRANSMIT

LINE

T2 1:1.15

GND

Component

R1 (Ω)

R2 (Ω)

E1 75 Ω Coaxial Cable

9.31

9.31

E1 120 Ω 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 17. Internal TX, External RX Impedance Matching

DS450PP2

51

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