CS61881-IB データシートの表示（PDF） - Cirrus Logic

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CS61881-IB

Octal E1 Analog Front End

Cirrus Logic 

CS61881

+

68µF

Note 2 RGND

+3.3V

+

0.1µF

GNDIO

+3.3V

0.1µF

RV+

VCCIO

+

0.1µF

Note 1

TGND

TV+

RTIP

1kΩ

0.1µF

CS61881

RRING

TRING

TTIP

1kΩ

R1

RECEIVE

LINE

R2

T1

1:2

TRANSMIT

LINE

T2 1:1.15

NC

120 Ω

Cable

GND

75 Ω

Cable

CBLSEL

13.3k Ω

REF

GND

Figure 10. External RX Impedance Matching

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 TVCC, RVCC, VCCIO and TGND, RGND, GNDIO respectively.

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

DS451PP3

27

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