参数资料
型号: PIC16F716-I/ML
厂商: Microchip Technology
文件页数: 77/136页
文件大小: 0K
描述: IC PIC MCU FLASH 2KX14 28QFN
标准包装: 61
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 13
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: 闪存
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 4x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-VQFN 裸露焊盘
包装: 管件
2007 Microchip Technology Inc.
DS41206B-page 43
PIC16F716
7.3
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 7-2. 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
varies over the device voltage (VDD), see Figure 7-2.
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. The 1/2 LSb error is
the maximum error allowed for the ADC to meet its
specified resolution.
EQUATION 7-1:
ACQUISITION TIME EXAMPLE
TACQ
Amplifier Settling Time
Hold Capacitor Charging Time
Temperature Coefficient
++
=
TAMP
TC
TCOFF
++
=
2μsTC
Temperature - 25°C
() 0.05μs/°C
()
[]
++
=
TC
CHOLD RIC
RSS
RS
++
() ln(1/2047)
=
10pF 1k
Ω 7kΩ 10kΩ
++
()
ln(0.0004885)
=
1.37
=
μs
TACQ
S
1.37μS
50°C- 25°C
() 0.05μS/°C
()
[]
++
=
4.67μS
=
VAPPLIED 1e
Tc
RC
---------
VAPPLIED 1
1
2047
------------
=
VAPPLIED 1
1
2047
------------
VCHOLD
=
VAPPLIED 1e
TC
RC
----------
VCHOLD
=
;[1] VCHOLD charged to within 1/2 lsb
;[2] VCHOLD charge response to VAPPLIED
;combining [1] and [2]
The value for TC can be approximated with the following equations:
Solving for TC:
Therefore:
Temperature
50°C and external impedance of 10k
Ω 5.0V VDD
=
Assumptions:
Note 1: The reference voltage (VREF) has no effect on the equation, since it cancels itself out.
2: The charge holding capacitor (CHOLD) is not discharged after each conversion.
3: The maximum recommended impedance for analog sources is 10 k
Ω. This is required to meet the pin
leakage specification.
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