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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： | 16/20页 |
| 文件大小： | 144K |
| 代理商： | M7705 |
Semiconductor
MSM7705-01/02/03
16/20
APPLICATION INFORMATION
DOUT Pull-up Resistor
A value of the pull-up resistor for the DOUT pin should be determined depending on frequencies
of BCLK and load capacitance.
If a smaller value is used, there may be some degradation in noise performance, resulting in an
increase in supply current.
Equation to give pull-up resistor
1
————
4
￥
f
– 50 ns
Rpull = ———————— (
W
)
C
L
where
f
BCLK
=
C
L
=
50 ns =
Frequency of BCLK
Load capacitance of the PCMOUT pin
(approximately 20 pF for a CMOS or TTL load)
Internal delay of the MSM7705
Condition for Calculation
If data is turned back from DOUT to DIN under the condition the SYNC signal and BCLK signal
rise simultaneously, the data can normally be transferred.
T = Rpull
￥
C
L
X, RSYNC
BCLK
DOUT
T
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