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參數(shù)資料
| 型號： | AK4588 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 2/8 CHANNEL AUDIO CODEC WITH DIR |
| 中文描述： | 2 / 8聲道音頻編解碼器迪爾 |
| 文件頁數(shù)： | 73/76頁 |
| 文件大?。?/td> | 787K |
| 代理商： | AK4588 |
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ASAHI KASEI
[AK4588]
MS0287-E-01
2004/03
- 73 -
1. Grounding and Power Supply Decoupling
The AK4588 requires careful attention to power supply and grounding arrangements. AVDD, DVDD, PVDD and
TVDD are usually supplied from analog supply in system. Alternatively if AVDD, DVDD, PVDD and TVDD are
supplied separately, the power up sequence is not critical.
AVSS, DVSS and PVSS of the AK4588 must be connected
to 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 AK4588 as possible,
with the small value ceramic capacitor being the nearest.
2. Voltage Reference Inputs
The voltage of VREFH sets the analog input/output range. VREFH pin is normally connected to AVDD with a 0.1
μ
F
ceramic capacitor. VCOM is a signal ground of this chip. An electrolytic capacitor 2.2
μ
F parallel with a 0.1
μ
F ceramic
capacitor attached to VCOM pin eliminates the effects of high frequency noise. No load current may be drawn from
VCOM pin. All signals, especially clocks, should be kept away from the VREFH and VCOM pins in order to avoid
unwanted coupling into the AK4588.
3. Analog Inputs
ADC inputs are single-ended and internally biased to VCOM. The input signal range scales with the supply voltage and
nominally 0.62 x VREFH Vpp (typ). The ADC output data format is 2’s complement. The DC offset is removed by the
internal HPF.
The AK4588 samples the analog inputs at 64fs. The digital filter rejects noise above the stop band except for multiples
of 64fs. The AK4588 includes an anti-aliasing filter (RC filter) to attenuate a noise around 64fs.
4. Analog Outputs
The analog outputs are also single-ended and centered around the VCOM voltage. The input signal range scales with
the supply voltage and nominally 0.6 x VREFH Vpp. The DAC input data format is 2’s complement. The output voltage
is a positive full scale for 7FFFFFH(@24bit) and a negative full scale for 800000H(@24bit). The ideal output is VCOM
voltage for 000000H(@24bit). The internal analog filters remove most of the noise generated by the delta-sigma
modulator of DAC beyond the audio passband.
DC offsets on analog outputs are eliminated by AC coupling since DAC outputs have DC offsets of a few mV.
相關(guān)PDF資料 |
PDF描述 |
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| AK4588VQ | 2/8 CHANNEL AUDIO CODEC WITH DIR |
| AK4589VQ | 2/8-Channel Audio CODEC with DIR |
| AK4591 | 24bit 4ch ADC + 24bit 6ch DAC |
| AK4620A | 24 BIT 192KHZ AUDIO CODEC WITH IPGA |
| AK4620AVF | 24 BIT 192KHZ AUDIO CODEC WITH IPGA |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4588VQ | 制造商:AKM 制造商全稱:AKM 功能描述:2/8 CHANNEL AUDIO CODEC WITH DIR |
| AK4589 | 制造商:AKM 制造商全稱:AKM 功能描述:2/8 CHANNEL AUDIO CODEC WITH DIR |
| AK4589_1 | 制造商:AKM 制造商全稱:AKM 功能描述:2/8-Channel Audio CODEC with DIR |
| AK4589VQ | 制造商:AKM 制造商全稱:AKM 功能描述:2/8-Channel Audio CODEC with DIR |
| AK4591 | 制造商:AKM 制造商全稱:AKM 功能描述:24bit 4ch ADC + 24bit 6ch DAC |
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