ASAHI KASEI
[AK4122]
Biphase signal input circuit
0.1uF
RX
75Ω
Coax
75Ω
AK4122
Figure 15. Consumer Input Circuit (Coaxial Input)
Note 1: Coax input only : if a coupling level to this input from the next RX input line pattern exceeds 50mV,
an incorrect operation may occur. In this case, it is possible to lower the coupling level by adding this
decoupling capacitor.
Note 2: Ground of the RCA connector and terminator should be connected to AVSS of the AK4122 with low
impedance on PC board.
3.3V
470
Optical
Fiber
O/E
RX
Optical Receiver
AK4122
Figure 16. Consumer Input Circuit (Optical Input, Using 3.3V Optical Receiver)
When using coaxial input, the input level of the RX line is small. Care must be taken to reduce, crosstalk among RX input
lines by inserting a shield pattern between them.
MS0267-E-02
2004/07
- 26 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
