参数资料
型号: PIC16C72A-04E/SS
厂商: Microchip Technology
文件页数: 69/120页
文件大小: 0K
描述: IC MCU OTP 2KX14 A/D PWM 28SSOP
产品培训模块: Asynchronous Stimulus
标准包装: 47
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 4MHz
连通性: I²C,SPI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 22
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: OTP
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 5x8b
振荡器型: 外部
工作温度: -40°C ~ 125°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
配用: 309-1025-ND - ADAPTER 28-SSOP TO 28-DIP
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 (CHOLD) 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 (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). 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, TACQ, 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 RS
= 10k
Vdd
= 3.0V (RSS = 10k
)
Temp. = 50
°C (122°F)
TACQ
≈ 13.0 Sec
By increasing VDD and reducing RS and Temp., TACQ
can be substantially reduced.
FIGURE 9-2:
ANALOG INPUT MODEL
EQUATION 9-1:
ACQUISITION TIME
Note:
When the conversion is started, the hold-
ing capacitor is disconnected from the
input pin.
TACQ
=
Amplifier Settling Time +
Hold Capacitor Charging Time +
Temperature Coefficient
TAMP + TC + TCOFF
TAMP = 5
S
TC = - (51.2pF)(1k
+ RSS + RS) In(1/511)
TCOFF = (Temp -25
°C)(0.05S/°C)
CPIN
VA
Rs
ANx
5 pF
VDD
VT = 0.6V
I leakage
RIC
≤ 1k
Sampling
Switch
SS
RSS
CHOLD
= DAC capacitance
VSS
6V
RSS
5V
4V
3V
2V
5 678 9 10 11
(k
)
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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