WM8802
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BI-PHASE SIGNAL INPUT CIRCUITS (RX0, RX1, RX2)
If RX1, which has a built-in amplifier, is used as a coaxial input signal corruption may occur due to
the influence of the adjacent RX0 and RX2 input pins. RX0 and RX2 should be fixed to Low to
prevent them from influencing RX1.
The input signal to RX1 is temporarily open if RX1 is selected. The RX0 and RX2 potential must be
fixed due to coupling effects. In this case, 5 bi-phase signal input pins can be selected; RX1 and RX3
to RX 6.
If the input signal to RX1 is absolutely fixed to either High or Low then all 7 input pins can be used.
WM8802
RX0
0.1µF
RX1
RX2
RX3
RX4
RX5
RX6
Coaxial
75Ω
Other inputs
Figure 10 Bi-Phase Signal Input Circuits – Coaxial Input Circuit
WM8802
Optical
RX0
RX1
100Ω
100Ω
100Ω
RX2
RX3
RX4
RX5
RX6
Other inputs
Figure 11 Bi-Phase Signal Input Circuits – Optical Input Circuit
PP Rev 1.1 April 2004
22
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
