參數資料
型號: PIC16CR74-I/L
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數: 160/172頁
文件大?。?/td> 2964K
代理商: PIC16CR74-I/L
PIC16CR7X
DS21993C-page 86
2007 Microchip Technology Inc.
11.1
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 11-2. 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 11-2. 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), the acquisition period must pass
before the conversion can be started.
To calculate the minimum acquisition time, TACQ, see
the “PIC Mid-Range MCU Family Reference Manual”
(DS33023). In general, however, given a maximum
source impedance of 10 k
Ω and at a temperature of
100°C, TACQ will be no more than 16
μsec.
FIGURE 11-2:
ANALOG INPUT MODEL
TABLE 11-1:
TAD vs. MAXIMUM DEVICE OPERATING FREQUENCIES (STANDARD DEVICES (C))
AD Clock Source (TAD)
Maximum Device Frequency
Operation
ADCS1:ADCS0
Max.
2TOSC
00
1.25 MHz
8TOSC
01
5 MHz
32TOSC
10
20 MHz
RC(1, 2, 3)
11
(Note 1)
Note 1: The RC source has a typical TAD time of 4
μs but can vary between 2-6 μs.
2:
When the device frequencies are greater than 1 MHz, the RC A/D conversion clock source is only
recommended for Sleep operation.
3:
For extended voltage devices (LC), please refer to the Electrical Specifications section.
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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