参数资料
型号: PIC16LC716-04/SS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO20
封装: 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件页数: 53/106页
文件大小: 1718K
代理商: PIC16LC716-04/SS
PIC16C712/716
DS41106B-page 48
2005 Microchip Technology Inc.
8.1
A/D Acquisition Requirements
For the A/D converter 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 8-4. 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). The
source impedance affects the offset voltage at the
analog input (due to pin leakage current). The
maximum recommended impedance for analog
sources is 10 k
Ω. After the analog input channel is
selected (changed) this acquisition must be done
before the conversion can be started.
To calculate the minimum acquisition time, TACQ, see
the
PICmicro
Mid-Range
Reference
Manual,
(DS33023). This equation calculates the acquisition
time to within 1/2 LSb error (512 steps for the A/D). The
1/2 LSb error is the maximum error allowed for the A/D
to meet its specified accuracy.
FIGURE 8-4:
ANALOG INPUT MODEL
Note:
When the conversion is started, the hold-
ing capacitor is disconnected from the
input pin.
CPIN
VA
Rs
ANx
5 pF
VDD
VT = 0.6V
I leakage
RIC
≤ 1k
Sampling
Switch
SS
RSS
CHOLD
= DAC capacitance
VSS
6V
Sampling Switch
5V
4V
3V
2V
567 8 9 10 11
(k
Ω)
VDD
= 51.2 pF
± 500 nA
Legend: CPIN
VT
I leakage
RIC
SS
CHOLD
= input capacitance
= threshold voltage
= leakage current at the pin due to
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
various junctions
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