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參數(shù)資料
| 型號： | SP8505 |
| 元件分類： | 串行ADC |
| 英文描述： | 12-Bit Sampling A/D Converters |
| 中文描述： | 12位采樣的A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 171K |
| 代理商： | SP8505 |
49
INPUT VOLTAGE RANGE AND LSB VALUES
Input Voltage Range Defined As:
Analog Input Connected to Pin
Pin Connected to AGND
One Least Significant Bit (LSB)
±
10V
2
3
20V/2
12
4.88mV
±
5V
3
2
10V/2
12
2.44mV
FSR/2
12
OUTPUT TRANSITION VALUES
FFEH TO FFFH
+ FULL SCALE
+10V–3/2LSB
+9.9927V
0V–1/2LSB
–2.44mV
–10V+1/2LSB
-9.9976V
+5V–3/2LSB
+4.9963V
0V–1/2LSB
–1.22mV
–5V+1/2LSB
-4.9988V
7FFH TO 800H
Mid Scale
(Bipolar Zero)
–Full Scale
000H to 001H
Table 2. Input Voltages, Transition Voltages and LSB Values
toggles on and off at code 1111 1111 1110
BIN
=
FFE
H
= 4094
DEC
.
±
10V Range Offset and Gain
Offset
— Apply 1.2622V to the
±
10V input at
pin 2. Adjust the offset potentiometer until the
LSB toggles on and off at code 1001 0000
0010
BIN
= 902
H
= 2306
DEC
.
Gain
— Apply 9.9927V to the
±
10V input at pin
2. Adjust the gain potentiometer until the LSB
toggles on and off at code 1111 1111 1110
BIN
=
FFE
H
= 4094
DEC
.
Layout Considerations
Because of the high resolution and linearity of
the
SP85XX Series
, system design problems
such as ground path resistance and contact resis-
tance become very important.
Calibration Procedure
Apply a precision input voltage source to your
chosen input range (
±
10V range at pin 2 or
±
5V
at pin 3). Set the A/D to convert continuously.
Monitor the output code. Trim the offset first,
then gain. Use the appropriate input voltages
and output target codes for your chosen input
range as follows. The recommended offset cali-
bration voltage values eliminate interaction be-
tween the offset and gain calibration
±
5V Range Offset and Gain
Offset
— Apply 1.5637V to the
±
5V input at pin
3. Adjust the offset potentiometer until the LSB
toggles on and off at code 1010 1000 0000
BIN
=
A80
H
= 2688
DEC
.
Gain
— Apply 4.9963V to the
±
5V input at pin
3. Adjust the gain potentiometer until the LSB
Figure 3. a)
±
10V Range b)
±
5V Range — With External Trims
a)
b)
SP85XX
1
2
3
4
5
6
7
R
2
=100
+5V
±10V
Input
GAIN ADJUST
100
10K
BIPOLAR ZERO ADJUST
R
1
=10K
499
–15V
SP85XX
1
2
3
4
5
6
7
GAIN ADJUST
R
2
=100
+5V
±5V
Input
R
1
=10KW
1K
–15V
30.1K
301
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PDF描述 |
|---|---|
| SP8505KN | 12-Bit Sampling A/D Converters |
| SP8505KS | 12-Bit Sampling A/D Converters |
| SP8510 | 12-Bit Sampling A/D Converters |
| SP8510KN | 12-Bit Sampling A/D Converters |
| SP8510KS | 12-Bit Sampling A/D Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP8505KN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:12-Bit Sampling A/D Converters |
| SP8505KS | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:12-Bit Sampling A/D Converters |
| SP8510 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:12-Bit Sampling A/D Converters |
| SP8510KN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:12-Bit Sampling A/D Converters |
| SP8510KS | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:12-Bit Sampling A/D Converters |
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