Instruction Manual

CS61884
52 DS485F3
Figure 18. Internal TX, External RX Impedance Matching
+
RGND
0.1
μ
F
+3.3V
RV+
T1 1:2
REF
TRING
TTIP
T2 1:2
RTIP
RRING
R1
R2
13.3k Ω
GND
CBLSEL
TV+
VCCIO
+3.3V
+
TGND
+
0.1
μ
F
GNDIO
NC
100 Ω
75 Ω
Cable
120
Ω
Cable
GND
1k Ω
1k Ω
TRANSMIT
LINE
RECEIVE
LINE
0.1
μ
F
0.1
μ
F
Note 1
Note 1
Note 2
68
μ
F
CS61884
One Channel
Notes: 1)Required Capacitor between each TV+, RV+, VCCIO and TGND, RGND, GNDIO
respectively.
2)Common decoupling capacitor for all TVCC and TGND pins.
Component
T1/J1 100Ω
Twisted Pair
Cable
E1 75Ω
Coaxial
Cable
E1 120Ω
Twisted Pair
Cable
R1 (Ω) 12.5 9.31 15
R2 (Ω) 12.5 9.31 15