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参数资料
| 型号： | STR635FZ1T6 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 36 MHz, RISC MICROCONTROLLER, PQFP144 |
| 封装： | 20 X 20 MM, TQFP-144 |
| 文件页数： | 39/51页 |
| 文件大小： | 1485K |
| 代理商： | STR635FZ1T6 |
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Electrical parameters
STR73xF
44/51
Analog Power Supply and Reference Pins
The VDDA and VSSA pins are the analog power supply of the A/D converter cell. They act as
the high and low reference voltages for the conversion.
Separation of the digital and analog power pins allow board designers to improve A/D
performance. Conversion accuracy can be impacted by voltage drops and noise in the event
of heavily loaded or badly decoupled power supply lines (see: General PCB Design
General PCB Design Guidelines
To obtain best results, some general design and layout rules should be followed when
designing the application PCB to shield the noise-sensitive, analog physical interface from
noise-generating CMOS logic signals.
●
Use separate digital and analog planes. The analog ground plane should be connected
to the digital ground plane via a single point on the PCB.
●
Filter power to the analog power planes. It is recommended to connect capacitors, with
good high frequency characteristics, between the power and ground lines, placing
0.1F and optionally, if needed 10pF capacitors as close as possible to the STR7
power supply pins and a 1 to 10F capacitor close to the power source (see Figure 16).
●
The analog and digital power supplies should be connected in a star network. Do not
use a resistor, as VDDA is used as a reference voltage by the A/D converter and any
resistance would cause a voltage drop and a loss of accuracy.
●
Properly place components and route the signal traces on the PCB to shield the analog
inputs. Analog signals paths should run over the analog ground plane and be as short
as possible. Isolate analog signals from digital signals that may switch while the analog
inputs are being sampled by the A/D converter. Do not toggle digital outputs near the
A/D input being converted.
Software Filtering of Spurious Conversion Results
For EMC performance reasons, it is recommended to filter A/D conversion outliers using
software filtering techniques.
Figure 16. Power Supply Filtering
VSS
VDD
0.1
F
5V
STR73x
VDDA
VSSA
POWER
SUPPLY
SOURCE
STR7
DIGITAL NOISE
FILTERING
EXTERNAL
NOISE
FILTERING
1 to 10
F
0.1
F
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相关代理商/技术参数 |
参数描述 |
|---|---|
| STR7000 | 制造商:SANKEN 制造商全称:Sanken electric 功能描述:Separate Excitation Switching Type |
| STR7001 | 制造商:SANKEN 制造商全称:Sanken electric 功能描述:Separate Excitation Switching Type |
| STR7001+SI-8020 | 制造商:SANKEN 制造商全称:Sanken electric 功能描述:Separate Excitation Switching Type |
| STR7002 | 制造商:SANKEN 制造商全称:Sanken electric 功能描述:Separate Excitation Switching Type |
| STR7002+SI-8021 | 制造商:SANKEN 制造商全称:Sanken electric 功能描述:Separate Excitation Switching Type |
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