參數(shù)資料
型號: M34508G4GP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO20
封裝: 4.40 X 6.50 MM, 0.65 MM PITCH, PLASTIC, SSOP-20
文件頁數(shù): 42/106頁
文件大?。?/td> 1059K
代理商: M34508G4GP
Rev.1.03
2009.07.27
page 38 of 140
REJ03B0148-0103
4508 Group
A/D CONVERTER
The 4508 Group has a built-in A/D conversion circuit that performs
conversion by 10-bit successive comparison method. Table 11
shows the characteristics of this A/D converter. This A/D converter
can also be used as an 8-bit comparator to compare analog voltages
input from the analog input pin with preset values.
Table 11 A/D converter characteristics
Characteristics
Successive comparison method
10 bits
Linearity error: ±2LSB (VDD=2.7 to 5.5 V)
Differential non-linearity error: ±0.9LSB
(VDD=2.7 to 5.5 V)
31 s (f(XIN)=6 MHz, f(STCK)=f(XIN))
4
Parameter
Conversion format
Resolution
Relative accuracy
Conversion speed
Analog input pin
Fig. 31 A/D conversion circuit structure
VSS
VDD
DA converter
TABAD
1/6
Q13
Q11 Q10
Q12
TADAB
0
1
4
8
01
1
8
10
Q13
0
1
Q13
8
(Note 1)
8
2
TALA
Q13
TAQ1
TQ1A
ADF
(1)
2
1
0
10
D3/AIN5
D2/AIN4
Register A (4)
Register B (4)
DAC
operation
signal
Comparator
4-channel
multi-plexed
analog
switch
Instruction clock
A/D control circuit
Successive comparison
register (AD) (10)
A/D
interrupt
Comparator register (8)
Notes 1: This switch is turned ON only when A/D converter is operating and generates the comparison voltage.
2: Writing/reading data to the comparator register is possible only in the comparator mode (Q13=1).
The value of the comparator register is retained even when the mode is switched to the A/D conversion
mode (Q13=0) because it is separated from the successive comparison register (AD). Also, the resolution
in the comparator mode is 8 bits because the comparator register consists of 8 bits.
(Note 2)
P21/AIN1
P20/AIN0
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