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