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| 型号： | PIC10F222T-E/OT |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, RISC MICROCONTROLLER, PDSO6 |
| 封装： | LEAD FREE, PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 28/80页 |
| 文件大小： | 1069K |
| 代理商： | PIC10F222T-E/OT |
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PIC10F220/222
DS41270D-page 32
Preliminary
2007 Microchip Technology Inc.
7.9
A/D Acquisition Requirements
For the ADC to meet its specified accuracy, the charge
holding capacitor (CHOLD) must be allowed to fully
charge to the input channel voltage level. The Analog
Input model is shown in Figure 7-1. The source
impedance (RS) and the internal sampling switch (RSS)
impedance directly affect the time required to charge the
capacitor CHOLD. The sampling switch (RSS) impedance
The maximum recommended impedance for analog
sources is 10 k
Ω. As the source impedance is
decreased, the acquisition time may be decreased.
After the analog input channel is selected (or changed),
an A/D acquisition must be done before the conversion
can be started. To calculate the minimum acquisition
time, Equation 7-1 may be used. This equation
assumes that 1/2 LSb error is used (256 steps for the
ADC). The 1/2 LSb error is the maximum error allowed
for the ADC to meet its specified resolution.
EQUATION 7-1:
ACQUISITION TIME EXAMPLE
FIGURE 7-1:
ANALOG INPUT MODULE
Note 1: The charge holding capacitor (CHOLD) is not discharged after each conversion.
2: The maximum recommended impedance for analog sources is 10 k
Ω. This is required to meet the pin
leakage specification.
Assumptions:
Temperature = 50°C and external impedance of 10 k
Ω 5.0V VDD
Tacq
= Amplifier Settling Time + Hold Capacitor Charging Time + Temperature Coefficient
=TAMP + TC + TCOFF
=2
μs + TC + [(Temperature - 25°C)(0.05 μs/°C)]
Solving for Tc:
Tc
= CHOLD (RIC + RSS + RS) In(1/512)
= -25pF (l k
Ω + 7 kΩ + 10 kΩ ) In(0.00196)
=2.81
μs
Therefore:
Tacq
= 2
μs + 2.81 μs + [(50°C-25°C)(0.0 5μs/°C)]
=6.06
μs
CPIN
VA
Rs
ANx
5 pF
VDD
VT = 0.6V
I LEAKAGE
RIC
≤ 1k
Sampling
Switch
SS
Rss
CHOLD = 25 pF
VSS/VREF-
6V
Sampling Switch
5V
4V
3V
2V
567 8 9 10 11
(k
Ω)
VDD
± 500 nA
RSS
Legend:
CPIN
= Input Capacitance
VT
= Threshold Voltage
ILEAKAGE
= Leakage current at the pin due
to various junctions
RIC
= Interconnect Resistance
SS
= Sampling Switch
CHOLD
= Sample/Hold Capacitance
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PIC10F222TI/MC | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D |
| PIC10F222T-I/MC | 功能描述:8位微控制器 -MCU 0.75KB 23B RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC10F222TI/OT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D |
| PIC10F222T-I/OT | 功能描述:8位微控制器 -MCU 768 B FL 16 RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC10F222T-I/OT | 制造商:Microchip Technology Inc 功能描述:8-Bit Microcontroller IC |
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