參數資料
型號： 8XC552
廠商： NXP Semiconductors N.V.
英文描述： 80C51 FAMILY DERIVATIVES
中文描述： 80C51系列衍生物
文件頁數： 53/60頁
文件大小： 382K
代理商： 8XC552
Philips Semiconductors
80C51 Family Derivatives
8XC552/562 overview
1996 Aug 06
53
R
S
V
ANALOG
INPUT
C
S
C
C
To Comparator
+
I
N
I
N+1
Sm
N+1
Sm
N
Rm
N+1
Rm
N
Multiplexer
Rm = 0.5 - 3 kohms
CS + CC = 15pF maximum
RS = Recommended < 9.6 kohms for 1 LSB @ 12MHz
NOTE:
Because the analog to digital converter has a sampled-data comparator, the input looks capacitive to a source. When a conversion
is initiated, switch Sm closes for 8tcy (8
μ
s @ 12MHz crystal frequency) during which time capacitance Cs + Cc is charged. It should
be noted that the sampling causes the analog input to present a varying load to an analog source.
Figure 39. A/D Input: Equivalent Circuit
0
q
2q
3q
4q
5q
V
in
Code
out
100
000
001
010
011
101
Quantization Error
q = LSB = 5 mV
V
in
– V
digital
+ q/2
– q/2
V
in
Symmetrical Quantization Error
Figure 40. Effective Conversion Characteristic
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相關代理商/技術參數
參數描述
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