参数资料
型号: MB90522BPMC1
厂商: FUJITSU LTD
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP120
封装: 14 X 14 MM, 1.70 MM HEIGHT, 0.40 MM PITCH, PLASTIC, LQFP-120
文件页数: 85/96页
文件大小: 2960K
代理商: MB90522BPMC1
MB90520B Series
94
DS07-13707-5E
7.
Notes for A/D Conversion
The recommended external circuit impedance of analog inputs for MB90V520 is approximately 5 k
or less,
that for MB90F523B is approximately 15.5 k
or less, and that for MB90522B/523B is approximately 10 k or
less.
If using an external capacitor, the capacitance should be several thousand times the level of the chip’s internal
capacitor to allow for the partial potential between the external and internal capacitance.
If the impedance of the external circuit is too high, the analog voltage sampling interval may be too short. (for
sampling time
= 4 s, machine clock frequency = 16 MHz) .
Error
The relative error increases as |AVRH
AVRL| becomes smaller.
C
RON
Analog input
Comparator
MB90522B/523B
RON
= 2.2 k approx.
C
= 45 pF approx.
MB90F523B
RON
= 2.6 k approx.
C
= 28 pF approx.
Note : The values listed are an indication only.
Block diagram of analog input circuit model
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