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參數(shù)資料
| 型號(hào)： | AK5359 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | 24-Bit 192kHz ツヒ ADC |
| 中文描述： | 24位192kHz的ツヒ模數(shù)轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 14/18頁(yè) |
| 文件大?。?/td> | 145K |
| 代理商： | AK5359 |
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ASAHI KASEI
[AK5359]
MS0428-E-00
2005/09
- 14 -
1. Grounding and Power Supply Decoupling
The AK5359 requires careful attention to power supply and grounding arrangements. Alternatively if VA and VD are
supplied separately, the power up sequence is not critical.
AGND and DGND of the AK5359 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 AK5359 as possible, with the
small value ceramic capacitor being the nearest.
2. Voltage Reference
The voltage input to VA sets the analog input range. VCOM are 50%VA and normally connected to AGND with a 0.1
μ
F
ceramic capacitor. A capacitor 2.2
μ
F is attached to VCOM pin. No load current may be drawn from these pins. All
signals, especially clocks, should be kept away from the VCOM pin in order to avoid unwanted coupling into the
AK5359.
3. Analog Inputs
The ADC inputs are single-ended and internally biased to the common voltage (50%VA) with 20k
(typ@fs=48kHz)
resistance. The input signal range scales with the supply voltage and nominally 0.6xVA Vpp (typ). The ADC output data
format is 2’s complement. The internal HPF removes the DC offset.
The AK5359 samples the analog inputs at 64fs (@fs=48kHz, 96kHz) or 32fs(@192kHz). The digital filter rejects noise
above the stop band except for multiples of 64fs or 32fs. The AK5359 includes an anti-aliasing filter (RC filter) to
attenuate a noise around 64fs or 32fs.
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