參數(shù)資料
型號(hào)： 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)： 89/160頁
文件大小： 2600K
代理商： 16F872
1999 Microchip Technology Inc.
Preliminary
DS30221A-page 89
PIC16F872
EQUATION 10-1:
ACQUISITION TIME
FIGURE 10-2: ANALOG INPUT MODEL
T
ACQ
T
C
T
ACQ
=
=
=
=
=
=
=
=
Amplifier Settling Time +
Hold Capacitor Charging Time +
Temperature Coefficient
T
AMP
+ T
C
+ T
COFF
2
μ
S + T
C
+ [(Temperature
-25°C)(0.05
μ
S/°C)]
C
HOLD
(R
IC
+ R
SS
+ R
S
) In(1/2047)
- 120pF (1k
+ 7k
+ 10k
) In(0.0004885)
16.47
μ
S
2
μ
S + 16.47
μ
S + [(50°C -25×C)(0.05
μ
S/×C)
19.72
μ
S
Note 1:
The reference voltage (V
REF
) has no effect on the equation, since it cancels itself out.
2:
The charge holding capacitor (C
HOLD
) is not discharged after each conversion.
3:
The maximum recommended impedance for analog sources is 10 k
. This is required to meet the pin leak-
age specification.
4:
After a conversion has completed, a 2.0T
AD
delay must complete before acquisition can begin again.
During this time, the holding capacitor is not connected to the selected A/D input channel.
C
PIN
5 pF
VA
R
S
ANx
V
DD
V
T
= 0.6V
V
T
= 0.6V
I
± 500 nA
R
IC
≤
1k
Sampling
Switch
SS R
SS
C
= DAC capacitance
= 120 pF
V
SS
6V
5V
4V
3V
2V
Sampling Switch
( k
)
5 6 7 8 91011
V
DD
Legend
C
PIN
V
T
I
LEAKAGE
R
IC
SS
C
HOLD
= input capacitance
= threshold voltage
= leakage current at the pin due to
various junctions
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
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