AK4683_07 Datasheet, PDF (51/84 Pages) Asahi Kasei Microsystems – Asynchronous Multi-Channel Audio CODEC with DIR/T

[AK4683]
The DITD1-0 bits control the data source of DIT.
DITD1 bit
0
0
1
1
DITD0 bit
0
1
0
1
DIT Source
DIR
ADC
SDTIB
SDTIA1(default)
Table 58. DIT Source Control
■ Biphase signal input/output circuit (RX0, TX)
75Ω
Coax
0.1uF
RX0
75Ω
AK4683
Figure 28. 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
RX0-3
AK4683
Figure 29. Consumer Input Circuit (Optical Input)
In case of coaxial input, as the input level of RX0 line is small, be careful not to crosstalk among RX input lines. For
example, by inserting the shield pattern among them.
The AK4683 includes the TX output buffer. The output level meets combination 0.5V+/-20% using the external resistor
network. The T1 in Figure 30 is a transformer of 1:1.
330±2%
TX
DVSS
100±2%
75Ω cable
T1
Figure 30. TX External Resistor Network
MS0427-E-02
- 51 -
2007/04