ASAHI KASEI
[AK4115]
Bi-phase signal input circuit
0.1uF
RX
75
Ω
Coax
75
Ω
AK4115
Figure 21. Consumer Input Circuit (Coaxial Input)
Note: For coaxial input, if a coupling level to this input from the next RX input line
pattern exceeds 50mV, there may be an incorrect operation. In this case, it is
possible to lower the coupling level by adding this decoupling capacitor.
Optical Receiver
470
Optical
Fiber
RX
O/E
AK4115
Figure 22. Consumer Input Circuit (Optical Input)
0.1uF
RXP
Ω
110
Ω
110
Twisted
Pair
0.1uF
RXN
AK4115
Table 23. Professional Input Circuit (Balanced Input)
Note. When RXN pin is unused, RXN pin must be AC-coupled to ground.
For coaxial input in serial mode, the input level of RX line is small, so care must be taken to avoid crosstalk among the
RX input lines. In this case, a shield is recommended between the input lines. In parallel mode, RX3-0 is available and
RX7-4 change to other pins for audio format control. Those pins must be fixed to “H” or “L”.
MS0573-E-00
2006/12
- 30 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
