參數(shù)資料
型號(hào)： PIC16C62B
廠商： Microchip Technology Inc.
英文描述： 28-Pin 8-Bit CMOS Microcontrollers(28引腳，8位CMOS微控制器)
中文描述： 28引腳8位CMOS微控制器（28引腳，8位的CMOS微控制器）
文件頁數(shù)： 52/120頁
文件大?。?/td> 2122K
代理商： PIC16C62B
PIC16C62B/72A
DS35008B-page 52
Preliminary
1999 Microchip Technology Inc.
9.1
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 9-2. 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
). The
source impedance affects the offset voltage at the ana-
log input (due to pin leakage current).
The maximum
recommended impedance for analog sources is 10
k
. After the analog input channel is selected
(changed), this acquisition must pass before the con-
version can be started.
To calculate the minimum acquisition time, T
ACQ
, see
Equation 9-1. 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.
In general;
Assuming R
S
= 10k
= 3.0V (R
SS
= 10k
)
Temp. = 50
°
C (122
°
F)
T
ACQ
≈
13.0
μ
Sec
By increasing V
DD
and reducing R
S
and Temp., T
ACQ
can be substantially reduced.
Vdd
FIGURE 9-2:
ANALOG INPUT MODEL
EQUATION 9-1:
ACQUISITION TIME
Amplifier Settling Time +
Hold Capacitor Charging Time +
Temperature Coefficient
Note:
When the conversion is started, the hold-
ing capacitor is disconnected from the
input pin.
T
ACQ
=
=
T
AMP
+ T
C
+ T
COFF
T
AMP
= 5
μ
S
T
C
=
- (51.2pF)(1k
+ R
SS
+ R
S
) In(1/511)
T
COFF
=
(Temp -25
°
C)(0.05
μ
S/
°
C)
C
PIN
5 pF
VA
Rs
ANx
V
DD
V
T
= 0.6V
V
T
= 0.6V
I leakage
± 500 nA
R
IC
≤
1k
Sampling
Switch
SS
R
SS
C
= DAC capacitance
= 51.2 pF
V
SS
6V
5V
4V
3V
2V
R
SS
(k
)
5 6 7 8 9 10 11
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16C62B/JW 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16C62B-04/SO 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16C62B-04/SP 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16C62B-04/SP 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C62 SDIL28
PIC16C62B-04/SS 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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