參數(shù)資料
型號(hào)： AK4115
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： High Feature 192kHz 24bit Digital Audio Interface Transceiver
中文描述： 高功能192kHz的24位數(shù)字音頻接口收發(fā)器
文件頁(yè)數(shù)： 31/64頁(yè)
文件大小： 606K
代理商： AK4115
ASAHI KASEI
[AK4115]
MS0573-E-00
2006/12
- 31 -
Bi-phase signal output circuit
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.
R1
TX0
TVSS
R2
T1
75
cable
TVDD R1 R2
3.3V 240
150
3.0V 220
150
5.0V 430
150
Figure 23. TX0 External Resistor Network 1
Note: When the AK4115 is in the power-down mode (PDN pin = “L”), power supply current can be reduced by using an
AC coupling capacitor as shown in Figure 24, since TX1 output is undetermined in power-down mode.
R1
0.1uF
TX0
TVSS
R2
T1
75
cable
TVDD R1 R2
3.3V 240
150
3.0V 220
150
5.0V 430
150
Figure 24. TX0 External Resistor Network 2
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.
75
0.1uF
TXP1
TXN1
T1
110
cable
Figure 25. Professional Output Driver Circuit
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