參數(shù)資料
型號: 16F872
廠商: Microchip Technology Inc.
英文描述: CAT 5E CROSSOVER PATCH CORD CABLE GREEN 10 FT
中文描述: 28引腳,8位閃存微控制器的CMOS
文件頁數(shù): 88/160頁
文件大?。?/td> 2600K
代理商: 16F872
PIC16F872
DS30221A-page 88
Preliminary
1999 Microchip Technology Inc.
FIGURE 10-1: A/D BLOCK DIAGRAM
10.1
A/D Acquisition Requirements
For the A/D converter to meet its specified accuracy,
the charge holding capacitor (C
HOLD
) must be allowed
to fully charge to the input channel voltage level. The
analog input model is shown in Figure 10-2. The
source impedance (R
S
) and the internal sampling
switch (R
SS
) impedance directly affect the time
required to charge the capacitor C
HOLD
. The sampling
switch (R
SS
) impedance varies over the device voltage
(V
DD
), Figure 10-2.
The maximum recommended
impedance for analog sources is 10 k
.
As the
impedance is decreased, the acquisition time may be
decreased. After the analog input channel is selected
(changed), this acquisition must be done before the
conversion can be started.
To
calculate
the
minimum
Equation 10-1 may be used. This equation assumes
that 1/2 LSb error is used (1024 steps for the A/D). The
1/2 LSb error is the maximum error allowed for the A/D
to meet its specified resolution.
acquisition
time,
To calculate the minimum acquisition time, T
ACQ
, see
the
PICmicro
Mid-Range
(DS33023).
Reference
Manual
(Input voltage)
V
AIN
V
REF
+
(Reference
voltage)
V
DD
PCFG<3:0>
CHS<2:0>
RA5/AN4
RA3/AN3/V
REF
+
RA2/AN2/V
REF
-
RA1/AN1
RA0/AN0
100
011
010
001
000
A/D
Converter
V
REF
-
(Reference
voltage)
V
SS
PCFG<3:0>
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