參數(shù)資料
型號: PIC14000-04/SP
廠商: Microchip Technology
文件頁數(shù): 115/153頁
文件大小: 0K
描述: IC MCU OTP 4KX14 A/D 28DIP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 15
系列: PIC® 14
核心處理器: PIC
芯體尺寸: 8-位
速度: 4MHz
連通性: I²C
外圍設(shè)備: POR,溫度傳感器,WDT
輸入/輸出數(shù): 20
程序存儲器容量: 7KB(4K x 14)
程序存儲器類型: OTP
RAM 容量: 192 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器: 斜率 A/D
振蕩器型: 內(nèi)部
工作溫度: 0°C ~ 70°C
封裝/外殼: 28-DIP(0.300",7.62mm)
包裝: 管件
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
ICE2000-ND - EMULATOR MPLAB-ICE 2000 POD
PIC14000
DS40122B-page 64
Preliminary
1996 Microchip Technology Inc.
8.8
A/D Speed, Resolution and Capacitor
Selection
The conversion time for the A/D converter on the
PIC14000 can be calculated using the equation:
Conversion Time = (1/Fosc) x 2N
Where Fosc is the oscillator frequency and N is the
number of bits of resolution desired.
Therefore at 4MHz, the conversion time for 16 bits is
16.384 msec. Conversely, it is 256
sec for 10 bits.
Choosing the correct ramp capacitor for the CDAC pin
is required to achieve the desired resolution, conver-
sion time and full scale input voltage. The equation for
selecting the ramp capacitor value is:
Capacitor = (conversion time in seconds) X
(current source output in amps) / (full scale in volts)
Table 8-6 provides example capacitor values for the
desired A/D resolution, conversion time, and full scale
voltage measurement.
TABLE 8-6:
CDAC CAPACITOR SELECTION (EXAMPLES FOR FULL SCALE OF 3.5V AND 1.5V)
A/D
Resolution
(Bits)
Conversion Time
(Seconds)
Full Scale
(Volts)
A/D Current
Source Output
(
amps)
Calculated
CDAC
Capacitor
(Farads)
CDAC Capacitor
Nearest Standard
Value
16
0.016384
3.5
24.75
1.17E-07
.1uF
14
0.004096
3.5
24.75
2.93E-08
.022uF
12
0.001024
3.5
24.75
7.31E-09
6800pF
16
0.016384
1.5
24.75
2.73E-07
0.22
F
14
0.004096
1.5
24.75
6.83E-08
68nF
12
0.001024
1.5
24.75
1.71E-08
15nF
Note: Assumes FOSC of 4 MHz.
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