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参数资料
| 型号： | M7705 |
| 厂商： | OKI SEMICONDUCTOR CO., LTD. |
| 元件分类： | Codec |
| 英文描述： | 4ch Single Rail CODEC |
| 中文描述： | 4路单铁编解码器 |
| 文件页数： | 17/20页 |
| 文件大小： | 144K |
| 代理商： | M7705 |
Semiconductor
MSM7705-01/02/03
17/20
BCLK (kHz)
64
128
256
512
1024
1544
2048
385.6
190.3
92.7
43.8
19.4
11.2
7.2
C
L
= 10 pF
192.8
95.2
46.3
21.9
9.7
5.6
3.6
C
L
= 20 pF
77.1
38.1
18.5
8.8
3.9
2.2
1.4
C
L
= 50 pF
38.6
19.0
9.3
4.4
1.9
1.1
0.7
C
L
= 100 pF
Rpull (k
W
)
Choice of Actual Resistor Value
If the calculated value is more than or equal to 100 k
W
, 100 k
W
should be employed. +10% of the
calculated value is within a tolerance, thus, for example, the value of 10 k
W
can be used for the
calculated value of 9.3 k
W
in the above examples.
Channel Crosstalk
The MSM7705 contains the 4-channel CODEC. The circuit and trace design and pin layout are
made to minimize crosstalk between channels inside the LSI device provided the following
should be taken into consideration.
Transmit side
The GSX1 – AIN2, AIN3, and AIN4 traces should not be kept closer.
The GSX2 – AIN1, AIN3, and AIN4 traces should not be kept closer.
The GSX3 – AIN1, AIN2, and AIN4 traces should not be kept closer.
The GSX4 – AIN1, AIN2, and AIN3 traces should not be kept closer.
AIN1, AIN2, AIN3, and AIN4, which are op-amp inverting input pins, have higher resistance,
therefore proximity of these lines to signal lines of other channels may cause crosstalk.
Receive side
The channel outputs AOUT1, AOUT2, AOUT3, and AOUT4 of the receive side are amplifier
outputs with lower resistance, thus crosstalk due to PCB traces is smaller. Nevertheless, the
PCB traces should not be run closer together and in parallel wherever possible.
Calculation Example for Typical Values
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