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AS1500-Z

更新时间: 2024-10-28 04:06:43
品牌 Logo 应用领域
艾迈斯 - AMSCO 数字电位计
页数 文件大小 规格书
8页 365K
描述
Digital Potentiometer

AS1500-Z 技术参数

是否Rohs认证: 符合生命周期:Contact Manufacturer
包装说明:SOP, SOP8,.25Reach Compliance Code:unknown
风险等级:5.83转换器类型:DIGITAL POTENTIOMETER
JESD-30 代码:R-PDSO-G8端子数量:8
最高工作温度:125 °C最低工作温度:-40 °C
封装主体材料:PLASTIC/EPOXY封装代码:SOP
封装等效代码:SOP8,.25封装形状:RECTANGULAR
封装形式:SMALL OUTLINE电源:3/5 V
认证状态:Not Qualified子类别:Digital Potentiometers
表面贴装:YES技术:CMOS
温度等级:AUTOMOTIVE端子形式:GULL WING
端子节距:1.27 mm端子位置:DUAL
Base Number Matches:1

AS1500-Z 数据手册

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Data Sheet AS1500/1/2/3  
DX (Dec)  
Output State  
RWB ()  
A
255  
10061  
Full Scale  
RS  
RS  
RS  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
128  
1
5100  
139  
Midscale  
1 LSB  
Zero-Scale  
(Wiper Contact Resistance)  
0
100  
W
Table 7: RDAC-Codes WB  
The maximum current through the wiper and terminal B is  
5mA. If the current exceeds this limit the internal switches  
can degrade or even be damaged. As  
potentiometer the resistance RWA and RWB are totally  
symmetrical. The relation between them is shown in Figure  
4.  
RDAC  
LATCH  
AND  
a mechanical  
RS  
DECODE  
B
RS=RNOMINAL / 256  
Figure 5: Equivalent RDAC Circuit  
10  
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  
RW  
RW  
75  
50  
25  
0
VW (Dx)= (Dx)/256VAB + VB  
where VAB is the voltage applied between terminal A and B,  
VW is the voltage at the wiper, DX is the 8-Bit Code word  
and VB 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.  
0
64  
12  
19  
25  
CODE -  
Figure 4: RWA and RWB versa Code  
The resistance RWA is the complimentary resistor to RWB  
and can be controlled digitally as well. RWA starts at the  
maximum value of the nominal resistance and is reduced  
with increasing 8-Bit code words. The formula to calculate  
RWA is given below:  
Applications  
The digital potentiometer can replace in many applications  
the analog trimming potentiometer. The digital  
potentiometer is not sensitive to vibrations and shocks. It  
has an extremely small form-factor and can be adjusted  
very fast (e.g. AS1500 has an update rate of 600kHz)  
Furthermore the temperature drift, resolution and noise are  
RWA (Dx)= (256 - Dx)/256RAB + RW  
where RAB is the nominal resistance between terminal A  
and B, RW 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 AS1501 are given for specific codes DX.  
significant better and cannot be achieved with  
a
mechanical trimming potentiometer. Due to the  
programmability the resistor settings can be stored in the  
system memory, so that after a power down the exact  
settings can be recalled easily.  
DX (Dec)  
Output State  
Full Scale  
Midscale  
1 LSB  
Zero-Scale  
RWA ()  
89  
5050  
10011  
10050  
255  
128  
1
All analog signals must remain within 0 to VDD range. For  
standard potentiometer applications the wiper output can  
be used directly. In the case of a low impedance load a  
buffer shall be used.  
0
Table 8: RDAC-Codes WA  
Revision 1.0, Oct 2004  
Page 6 of 8  

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