ak4115 AKM Semiconductor, Inc., ak4115 Datasheet - Page 31

• Manufacturer Part Number: ak4115
• Description: High Feature 192khz 24bit Digital Audio Interface Transceiver
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The AK4115 includes two TX output buffers. The output level is proportional to TVDD voltage. The T1 in Figure 23,
Figure 24, Figure 25 and Figure 26 is a transformer of 1:1. The resistor values should use ±1% accuracy.
1. Line Driver of TX0
The output level of TX0 is 0.5V ± 20% using the external resistor network in consumer mode.
Note: When the AK4115 is in the power-down mode (PDN pin = “L”), power supply current can be reduced by using an
2. Line Driver of TX1
2-1. Professional Mode (TVDD = 4.5V ∼ 5.5V)
The TX1 has an RS422 line driver when TVDD is 5V±10%. The AES3 specification states that the line driver shall have
a balanced output with an internal impedance of 110 ohms ±20% and also requires a balanced output drive capability of 2
to 7 volts peak-to-peak into 110 ohm load. The internal impedance of the RS422 driver along with a series resistors of 75
ohms realizes this requirement.
MS0573-E-00
Bi-phase signal output circuit
AC coupling capacitor as shown in Figure 24, since TX1 output is undetermined in power-down mode.
TVSS
TVSS
TX0
TX0
TXP1
TXN1
0.1uF
R1
Figure 25. Professional Output Driver Circuit
Figure 23. TX0 External Resistor Network 1
Figure 24. TX0 External Resistor Network 2
R1
75
Ω
R2
R2
0.1uF
- 31 -
T1
T1
T1
75Ω cable
75Ω cable
TVDD R1
3.3V
3.0V
5.0V
TVDD R1
3.3V
3.0V
5.0V
110Ω cable
240Ω 150Ω
220Ω 150Ω
430Ω 150Ω
240Ω 150Ω
220Ω 150Ω
430Ω 150Ω
R2
R2
[AK4115]
2006/12