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数字电位器的原理及基本应用ADI

简介:

问:1,索要《数字电位器》有关资料。
2,《数字电位器》是不是很成熟的产品?如果购买,是不是可以得到很好的服务。
3,《数字电位器》。他有多少型号,在那里可以看到更多的《数字电位器》。北京那里有,
数字电位器》它的最大承电流能做到多大。
答: You can send email to china.support@analog.com asking for materials.
Digital potentiometer is product in mature, we can offer good services on our products.
The biggest current can be 5 mA, but by adding outside FET, you can greatly improve the cu

问:为何同类数字电位器在同样的控制条件下,上电的初始值不一样?
答: Then you must be using volatile digital POT. If you want a fixed figure of the resistence when power on, please use involatile POT, or OPT kind of digital POT. You can refer to slide 8 of the seminar.

问:ADI公司的数字电位器有无状态记忆功能?在掉电后再次上电时需要重新编程设定它吗?
答: We"ve both involatile digital potentiometer, and one time programmable digital potentiometer, both can keep the position of wiper, when power on no need to re-program.

问:在某模数转换设计中,利用数字电位器完成放大器放大量的调整,产生了很大的噪声,影响AD变换。最后,不得不使用机械式电位器。请问:怎样避免或者抑制噪声的产生?
答: I don"t recommend digital potentiometer applied as a front-end signal-conditioning device before high speed,hight accurate ADC.Maybe you can try AD523x.

问:当我关心电位器比率的温度稳定性能时,哪些方面需要考虑,可以使用哪些此性能高的器件?谢谢!
答: Use thin film digital pot such as AD5241, 5242, 5260, 5262, 5280, 5282, 5263, and 5235 for lowest TC, 35ppm/C.
If using the pot in "3-terminal potentiometer mode", even poly resistance (300ppm/C) will reduce significantly to say 50ppm/C becau

问:1、可否将数字电位器理解为是一种可对其电阻值进行控制的数字控制器件,而这种电阻值的控制是通过数字方式实现的?或者说可以通过编程方式获得?还是它仅仅是一个对电位变化进行接受的器件?而这种电位变化可以转化为数字量?
2、请回答其控制精度是多少?
多谢!
张亚雄2003年1月10日
答: 1.数字电位器可以理解为一种可对其电阻值进行控制的数字控制器件,而这种电阻值的控制是通过数字方式实现的或者说可以通过编程方式实现(spi/iic interface)。
2.ADI have 33,64,128,256,512,1024 postion resolutions digital potentiometer.

问:请问:数字电位器的种类有哪些,不同种类的数字电位器对其阻值变化的控制方式s是怎样的?
答: There are three control methods: manual, I2C interface and SPI interface. There are two materials used in the resistance: poly silicon and thin film.

You can refer to page 9, 18, 19, 20 for reference.

问:请问专家:数字电位器的功耗大小如何划分?价格是多少?(零售)
答: The amount of power dissipation is dependant on the switch sizes.  Some of our newer lower resolution parts offer power consumption on the order of 5uA such as the AD5273.

问:数字电位器有使用485接口控制的产品吗?
答: No, but you can used the ADuC814 as the RS-485 receiver and used its SPI port to control the digital POTs.

问:数字电位器可以用于精密工业控制吗?
答: 可以,尤其是1024 级 (如AD5231,AD5235/6).