ak4114 AKM Semiconductor, Inc., ak4114 Datasheet - Page 22

• Manufacturer Part Number: ak4114
• Description: High Feature 192khz 24bit Digital Audio Interface Transceiver
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
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, four channel inputs (RX0,1,2,3) are
available and RX4-7 change to other pins for audio format control. Those pins must be fixed to “H” or “L”.
The AK4114 includes the TX output buffer. The output level meets combination 0.5V+/-20% using the external resistor
network. The T1 in Figure 22 is a transformer of 1:1.
Note: When the AK4114 is in the power-down mode (PDN= “L”), power supply current can be suppressed by using AC
MS0098-E-04
Biphase signal input/output circuit
couple capacitor as following figure since TX1 pin output becomes uncertain at power-down mode.
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.
DVSS
DVSS
Optical
TX1
Fiber
TX
Coax
75Ω
0.1uF
Optical Receiver
Figure 20. Consumer Input Circuit (Coaxial Input)
Figure 21. Consumer Input Circuit (Optical Input)
R1
Figure 22. TX External Resistor Network
O/E
R1
R2
R2
75Ω
- 22 -
0.1uF
470
T1
T1
75Ω cable
75Ω cable
Vdd
3.3V 240Ω 150Ω
3.0V 220Ω 150Ω
Vdd
3.3V 240Ω 150Ω
3.0V 220Ω 150Ω
RX
RX
AK4114
AK4114
R1
R1
R2
R2
[AK4114]
2004/03