參數(shù)資料
型號(hào)： AK4122
廠商： Electronic Theatre Controls, Inc.
英文描述： 24 BIT 96KHZ SRC WITH DIR
中文描述： 24位96kHz Src與迪爾
文件頁(yè)數(shù)： 24/54頁(yè)
文件大小： 403K
代理商： AK4122
ASAHI KASEI
[AK4122]
MS0267-E-03
2004/08
- 24 -
System Reset
Bringing the PDN pin = “L” sets the AK4122 power-down mode and initializes the digital filter. When PDN pin = “L”,
the SDTO output is “L”. The AK4122 should be reset once by bringing PDN pin = “L” upon power-up. The SDTO is
valid from less than 100ms after the rising of PDN after clocks are supplied, and until then, outputs “L”. After the rising
of PDN pin, the SDTIO pin is input pin.
External clocks
(input / output port)
SDTO
(internal state)
PDN
don’t care
(stable)
don’t care
Power-down
normal operation
PLL locktime & fs detection
“0” data
< 100msec
normal data
Power-down
“0” data
Figure 13. System Reset
Sequence of changing clocks
The recommended sequence of changing clocks is shown as Figure 14. The internal reset is executed when the input or
the output clocks are changed. The SDTO is placed “0” during reset. Within 100ms, the SDTO outputs normal data.
When the frequency transition occurs gradually without the phase change, the output data may have large distortion for
several seconds. Then, to output normal data within 100ms, a reset by PDN pin = “L” or PWN bit = “0” is recommended
when clocks are changed.
External clocks
(input port
or output port)
PLL locktime
& fs detection
Power down
state 1 (44.1kHz)
SDTIO / SDTO
(internal state)
normal operation
normal operation
state 2 (48kHz)
(unknown)
< 100msec
SMUTE (Note2,
recommended)
1024/fso
Att.Level
0dB
-
∞
dB
normal data
normal data
1024/fso
PDN pin or
PWN bit
Note1
Figure 14. Sequence of changing clocks
Note 1. The data on SDTO may cause click noise. If SDTI or SDTIO is “0” from GD before PDN pin goes “L”,
the data on SDTO keeps “0” then no unknown data is output.
Note 2. SMUTE can remove the unknown data.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4122_1 制造商:AKM 制造商全稱:AKM 功能描述:24-Bit 96kHz SRC with DIR
AK4122A 制造商:AKM 制造商全稱:AKM 功能描述:24-Bit 96kHz SRC with DIR
AK4122AVQ 制造商:AKM 制造商全稱:AKM 功能描述:24-Bit 96kHz SRC with DIR
AK4122AVQP-L 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:SRC + DIR
AK4122VQ 制造商:AKM 制造商全稱:AKM 功能描述:24-Bit 96kHz SRC with DIR
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