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参数资料
| 型号： | SPC560B50L3C5E0R |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 64 MHz, MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 14 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-100 |
| 文件页数： | 54/74页 |
| 文件大小： | 971K |
| 代理商： | SPC560B50L3C5E0R |
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SPC560Bx, SPC560Cx
Electrical characteristics
Doc ID 14619 Rev 4
Input impedance and ADC accuracy
In the following analysis, the input circuit corresponding to the precise channels is
considered.
To preserve the accuracy of the A/D converter, it is necessary that analog input pins have
low AC impedance. Placing a capacitor with good high frequency characteristics at the input
pin of the device can be effective: the capacitor should be as large as possible, ideally
infinite. This capacitor contributes to attenuating the noise present on the input pin;
furthermore, it sources charge during the sampling phase, when the analog signal source is
a high-impedance source.
A real filter can typically be obtained by using a series resistance with a capacitor on the
input pin (simple RC filter). The RC filtering may be limited according to the value of source
impedance of the transducer or circuit supplying the analog signal to be measured. The filter
at the input pins must be designed taking into account the dynamic characteristics of the
input signal (bandwidth) and the equivalent input impedance of the ADC itself.
In fact a current sink contributor is represented by the charge sharing effects with the
sampling capacitance: CS being substantially a switched capacitance, with a frequency
equal to the conversion rate of the ADC, it can be seen as a resistive path to ground. For
instance, assuming a conversion rate of 1 MHz, with CS equal to 3 pF, a resistance of
330 k
Ω is obtained (R
EQ = 1 / (fc*CS), where fc represents the conversion rate at the
considered channel). To minimize the error induced by the voltage partitioning between this
resistance (sampled voltage on CS) and the sum of RS + RF + RL + RSW + RAD, the external
circuit must be designed to respect the Equation 4:
Equation 4
Equation 4 generates a constraint for external network design, in particular on a resistive
path. Internal switch resistances (RSW and RAD) can be neglected with respect to external
resistances.
V
A
R
S
R
F
R
L
R
SW
R
AD
++
+
R
EQ
---------------------------------------------------------------------------
1
2
---LSB
<
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相关代理商/技术参数 |
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| SPC560B50L3C6E0X | 功能描述:32位微控制器 - MCU 32-BIT Embedded MCU 64 MHz 512kB Body RoHS:否 制造商:Texas Instruments 核心:C28x 处理器系列:TMS320F28x 数据总线宽度:32 bit 最大时钟频率:90 MHz 程序存储器大小:64 KB 数据 RAM 大小:26 KB 片上 ADC:Yes 工作电源电压:2.97 V to 3.63 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:LQFP-80 安装风格:SMD/SMT |
| SPC560B50L3C6E0Y | 功能描述:32位微控制器 - MCU 32-BIT Embedded MCU 64 MHz 512kB Body RoHS:否 制造商:Texas Instruments 核心:C28x 处理器系列:TMS320F28x 数据总线宽度:32 bit 最大时钟频率:90 MHz 程序存储器大小:64 KB 数据 RAM 大小:26 KB 片上 ADC:Yes 工作电源电压:2.97 V to 3.63 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:LQFP-80 安装风格:SMD/SMT |
| SPC560B50L5C6E0X | 功能描述:32位微控制器 - MCU 32-BIT Embedded MCU 64 MHz 512kB Body RoHS:否 制造商:Texas Instruments 核心:C28x 处理器系列:TMS320F28x 数据总线宽度:32 bit 最大时钟频率:90 MHz 程序存储器大小:64 KB 数据 RAM 大小:26 KB 片上 ADC:Yes 工作电源电压:2.97 V to 3.63 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:LQFP-80 安装风格:SMD/SMT |
| SPC560B50L5C6E0Y | 功能描述:32位微控制器 - MCU 32-BIT Embedded MCU 64 MHz 512kB Body RoHS:否 制造商:Texas Instruments 核心:C28x 处理器系列:TMS320F28x 数据总线宽度:32 bit 最大时钟频率:90 MHz 程序存储器大小:64 KB 数据 RAM 大小:26 KB 片上 ADC:Yes 工作电源电压:2.97 V to 3.63 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:LQFP-80 安装风格:SMD/SMT |
| SPC560B50SK | 功能描述:开发板和工具包 - ARM Raisonance Kit 512K Starter Rflasher 64 RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V |
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