參數(shù)資料
型號(hào)： AK4645EZ
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類(lèi)： Codec
英文描述： Stereo CODEC with MIC/HP-AMP
中文描述： 立體聲編解碼器麥克風(fēng)/惠普腺苷
文件頁(yè)數(shù)： 84/96頁(yè)
文件大?。?/td> 933K
代理商： AK4645EZ
[AK4645EZ]
MS0605-E-00
2007/06
- 84 -
1.
Grounding and Power Supply Decoupling
The AK4645 requires careful attention to power supply and grounding arrangements. AVDD, DVDD, TVDD and HVDD
are usually supplied from the system’s analog supply. If AVDD, DVDD, TVDD and HVDD are supplied separately, the
power-up sequence is not critical. PDN pin should be held to “L” upon power-up. PDN pin should be set to “H” after all
power supplies are powered-up.
In case that the pop noise should be avoided at line output and headphone output, the AK4645 should be operated by the
following recommended power-up/down sequence.
1)
Power-up
-
PDN pin should be held to “L” upon power-up. The AK4645 should be reset by bringing PDN pin “L” for 150ns or
more.
-
In case that the power supplies are separated in two or more groups, the power supply including TVDD should be
powered ON at first. Regarding the relationship between DVDD and HVDD, the power supply including DVDD
should be powered ON prior to the power supply including HVDD.
2)
Power-down
-
Each power supplies should be powered OFF after PDN pin is set to “L”.
-
In case that the power supplies are separated in two or more groups, the power supply including TVDD should be
powered OFF at last. Regarding the relationship between DVDD and HVDD, the power supply including HVDD
should be powered OFF prior to the power supply including DVDD.
AVSS and HVSS of the AK4645 should be connected to the analog ground plane. System analog ground and digital
ground should be connected together near to where the supplies are brought onto the printed circuit board. Decoupling
capacitors should be as near to the AK4645 as possible, with the small value ceramic capacitor being the nearest.
2. Voltage Reference
VCOM is a signal ground of this chip. A 2.2
μ
F electrolytic capacitor in parallel with a 0.1
μ
F ceramic capacitor attached
to the VCOM pin eliminates the effects of high frequency noise. No load current may be drawn from the VCOM pin. All
signals, especially clocks, should be kept away from the VCOM pin in order to avoid unwanted coupling into the
AK4645.
3. Analog Inputs
The Mic, Line and MIN inputs are single-ended. The input signal range scales with nominally at 0.06 x AVDD Vpp(typ)
@MGAIN1-0 bits = “01”, 0.03 x AVDD Vpp(typ) @MGAIN1-0 bits = “10”, 0.015 x AVDD Vpp(typ) @MGAIN1-0
bits = “11” or 0.6 x AVDD Vpp(typ) @MGAIN1-0 bits = “00” for the Mic/Line input and 0.6 x AVDD Vpp (typ) for the
MIN input, centered around the internal common voltage (0.45 x AVDD). Usually the input signal is AC coupled using a
capacitor. The cut-off frequency is fc = (1/2
π
RC). The AK4645 can accept input voltages from AVSS to AVDD.
4. Analog Outputs
The input data format for the DAC is 2’s complement. The output voltage is a positive full scale for 7FFFH(@16bit) and
a negative full scale for 8000H(@16bit). The ideal output is VCOM voltage for 0000H(@16bit). Stereo Line Output is
centered at 0.45 x AVDD. The Headphone-Amp output is centered at HVDD/2.
相關(guān)PDF資料
PDF描述
AK4645 Stereo CODEC with MIC/HP-AMP
AK4646EZ Stereo CODEC with MIC/SPK-AMP
AK4646 Stereo CODEC with MIC/SPK-AMP
AK4646EN Stereo CODEC with MIC/SPK-AMP
AK4647 Stereo CODEC with MIC/HP-AMP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4646 制造商:AKM 制造商全稱(chēng):AKM 功能描述:Stereo CODEC with built-in MIC/SPK amplifier
AK4646_11 制造商:AKM 制造商全稱(chēng):AKM 功能描述:Stereo CODEC with MIC/SPK-AMP
AK4646EN 制造商:AKM 制造商全稱(chēng):AKM 功能描述:Stereo CODEC with MIC/SPK-AMP
AK4646ENP-L 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:STEREO CODEC+SPK
AK4646EZ 制造商:AKM 制造商全稱(chēng):AKM 功能描述:Stereo CODEC with MIC/SPK-AMP
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