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參數(shù)資料
| 型號： | AK4516AVF |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | 3V 16BIT ADC&DAC WITH BUILT-IN PGA |
| 中文描述： | 3V的16位ADC |
| 文件頁數(shù)： | 36/39頁 |
| 文件大?。?/td> | 355K |
| 代理商： | AK4516AVF |
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ASAHI KASEI
[AK4516A]
M0026-E-00
1998/08
- 36 -
1. Grounding and Power Supply Decoupling
The AK4516A requires careful attenuation to power supply and grounding arrangements. When VA and VD are
supplied separately, VA should not be the higher voltage than VD. If so not, VA is supplied from analog supply in
system and VD is supplied from VA via 10 ohms resistor.(refer to Figure 13 )
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 AK4516A as possible, with the small
value ceramic capacitor being nearest.
2. Voltage Reference
VCOM is a signal ground of this chip. An electrolytic less than 4.7uF in parallel with a 0.1uF ceramic capacitor
attached to these pins eliminates the effects of high frequency noise. No load current maybe drawn from VCOM pin.
All signals, especially clock, should be kept away from the VA, VCML, VCMR, VCOM pins in order to avoid
unwanted coupling into the AK4516A.
3. Analog Inputs
ADC inputs are single-ended and internally biased to VCML & VCMR with 50k
(typ). The input signal range scales
with the supply voltage and nominally 0.57 x VA Vpp(typ). The ADC output data format is 2's compliment. The output
code is 7FFFH(@16bit) for input above a positive full scale and 8000H(@16bit) for input below a negative full scale.
Ideal code is 0000H(@16bit) with no input signal.
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 VA Vpp(typ). The DAC input data format is 2's compliment. 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). If the noise generated by the delta-sigma modulator beyond the audio band
would be the problem, the attenuation by external filter is required.
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