參數(shù)資料
型號(hào)： MB89P965APF
廠商： FUJITSU LTD
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PQFP48
封裝： 0.80 MM PITCH, PLASTIC, QFP-48
文件頁(yè)數(shù)： 35/48頁(yè)
文件大?。?/td> 578K
代理商： MB89P965APF
MB89960 Series
40
7.
Notes for A/D Conversion
Analog input pins and input impedance
The A/D converter incorporates a sample & hold circuit as shown below. When an A/D conversion starts, the
voltage at the analog input pin is captured by the sample & hold capacitor for a period of 16 instruction cycles.
Accordingly, if the output impedance of the external circuit connected to the analog input is high, the analog
input voltage may not stabilize within the period of the analog input sampling time. Therefore, ensure that the
output impedance of the external circuit is sufficiently low (10 k
or less) . If it is not possible to reduce the output
impedance of the external circuit, connecting an external capacitor of approximately 0.1
F is recommended.
Error
The relative error increases as |AVR
AVSS| becomes smaller.
AN0 to AN3
Sample & hold circuit
Comparator
controller
R
Analog channel selector
Closed for approximately 16 instruction cycles
after initiating A/D conversion.
MB89965
MB89P965A
MB89F969A
R
= 3.2 k, C = 30 pF approx
R
= 1.4 k, C = 64 pF approx.
MB89960 series
MB89PV960
C
Equivalent circuit of analog input
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