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AS1524-BTDR 参数 Datasheet PDF下载

AS1524-BTDR图片预览
型号: AS1524-BTDR
PDF下载: 下载PDF文件 查看货源
内容描述: 下150ksps , 12位, 1通道伪/真差分和2路单端ADC [150ksps, 12-Bit, 1-Channel Pseudo/True-Differential and 2-Channel Single-Ended ADCs]
分类和应用:
文件页数/大小: 22 页 / 708 K
品牌: AMSCO [ AMS(艾迈斯) ]
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AS1524/AS1525  
Datasheet - Application Information  
Layout and Grounding Considerations  
The AS1524/AS1525 require proper layout and design procedures for optimum performance.  
Use printed circuit boards; wirewrap boards should not be used.  
Separate analog and digital traces from each other. Analog and digital traces should not run parallel to each other  
(especially clock traces).  
Digital traces should not run beneath the AS1524/AS1525.  
Use a single-point analog ground at GND, separate from the digital ground (see Figure 30). Connect all other ana-  
log grounds and DGND to this star ground point for further noise reduction. No other digital system ground should  
be connected to this single-point analog ground. The ground return to the power supply for this ground should be  
low impedance and as short as possible for noise-free operation.  
High-frequency noise in the VDD power supply may affect the AS1524/AS1525 high-speed comparator. Bypass  
this supply to the single-point analog ground with 0.1µF and 4.7µF bypass capacitors (see Figure 30). The bypass  
capacitors should be placed as close to the device as possible for optimum power supply noise-rejection. If the  
power supply is very noisy, a 10Ω resistor can be connected as a low-pass filter to attenuate supply noise  
Power components such as the inductor, converter IC, filter capacitors, and output diode should be placed as close  
together as possible, and their traces should be kept short, direct, and wide.  
Keep the voltage feedback network very close to the device, within 5mm (0.2”) of the pin.  
Keep noisy traces, such as those from the pin LX, away from the voltage feedback network and guarded from  
them using grounded copper traces.  
Figure 30. Recommended Ground Design  
+5 or +3V  
+5 or +3V  
DGND  
Digital  
Circuitry  
GND  
GND  
Power  
Supplies  
4
GND  
AS1524/  
AS1525  
0.1µF  
5Ω  
(Optional)  
1
+5 or +3V  
VDD  
www.austriamicrosystems.com  
Revision 1.02  
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