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參數(shù)資料
| 型號(hào)： | AS1500-Z-T |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | 256 steps, SPI 10kΩ, DigiPot; Package Type: SOIC-8; Resistance: 10,00 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 398K |
| 代理商： | AS1500-Z-T |
www.austriamicrosystems.com
Revision 1.01
10 - 14
AS1500
Data Sheet
- Detailed Description
The resistance R
WA
is the complimentary resistor to R
WB
and can be controlled digitally as well. R
WA
starts at the
maximum value of the nominal resistance and is reduced with increasing 8-Bit code words. The formula to calculate
R
WA
is given below:
R
WA
(Dx)= (256 - Dx)/256 R
AB
+ R
W
(EQ 2)
where R
AB
is the nominal resistance between terminal A and B, R
W
is the wiper resistance and Dx is the 8-Bit Code
word. In Table 8 the resistor values between the wiper and terminal B for AS1500 are given for specific codes Dx.
Figure 6. Equivalent RDAC Circuit
Voltage Output Operation
The AS150x family can easily used in an voltage output mode, where the output voltage is proportional to an applied
voltage to a given terminal. When 5V are applied to terminal A and B is set to ground the ouput voltage at the wiper
starts at zero volts up to 1LSB less then 5V. One LSB of voltage corresponds to the voltage applied at terminal AB
divided through 256 steps of possible wiper settings. The formula is given by
V
W
(Dx)= (Dx)/256 V
AB
+ V
B
(EQ 3)
where V
AB
is the voltage applied between terminal A and B, VW is the voltage at the wiper, Dx is the 8-Bit Code word
and V
B
is the voltage at terminal B. The temperature drift is significant better than in Rheostat mode, since the
temperature coefficient is determined by the internal resistor ratio. Therefore the temperature drift is only 15ppm/°C.
Table 8. RDAC-Codes WA
D
X
(Dec)
R
WA
(
Ω
)
Output State
255
89
Full Scale
128
5050
Midscale
1
10011
1 LSB
0
10050
Zero-Scale
A
W
B
R
s
=R
NOMINAL
/256
R
s
R
s
R
s
R
s
D7
D6
D5
D4
D3
D2
D1
D0
RDAC
LATCH
AND
DECODE
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參數(shù)描述 |
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