AK4112B_12 Datasheet, PDF (14/31 Pages) Asahi Kasei Microsystems – High Feature 96kHz 24bit DIR

[AK4112B]
75Ω
Coax
0.1uF
RX
75Ω
0.47nF
Note
AK4112B
Figure 1. Consumer Input Circuit (Coaxial Input)
Note: In case of coaxial input, if a coupling level to this input from the next RX input line
pattern exceeds 50mV, there is a possibility to occur an incorrect operation. In this case, it is
possible to lower the coupling level by adding this decoupling capacitor.
Optical
Fiber
Optical Receiver
O/E
470
RX
AK4112B
Figure 2. Consumer Input Circuit (Optical Input)
In case of coaxial input, as the input level of RX line is small, in Serial Mode, be careful not to crosstalk among RX input
lines. For example, by inserting the shield pattern among them. In Parallel Mode, only one channel input (RX1) is
available and RX2-4 change to other pins for audio format control. Those pins must be fixed to “H” or “L”.
The AK4112B includes the TX output buffer. The output level meets combination 0.5V+/-20% using the external resistor
network. The T1 in Figure 3 is a transformer of 1:1.
R1
TX
DVSS
R2
75Ω cable
Vdd R1 R2
T1
3.3V 240Ω 150Ω
3.0V 220Ω 150Ω
Figure 3. TX External Resistor Network
MS0078-E-03
- 14 -
2012/01