一、數字電位器芯片有哪些

數(shu)(shu)字(zi)(zi)電(dian)(dian)位(wei)器(qi)(qi)（DigitalPotenTIometer）亦稱數(shu)(shu)控可編程(cheng)電(dian)(dian)阻器(qi)(qi)，是一種(zhong)代(dai)替(ti)傳統機械電(dian)(dian)位(wei)器(qi)(qi)（模(mo)擬電(dian)(dian)位(wei)器(qi)(qi)）的新型CMOS數(shu)(shu)字(zi)(zi)、模(mo)擬混合信號處理的集成電(dian)(dian)路(lu)。數(shu)(shu)字(zi)(zi)電(dian)(dian)位(wei)器(qi)(qi)由(you)數(shu)(shu)字(zi)(zi)輸入控制，產生一個模(mo)擬量(liang)的輸出。依(yi)據數(shu)(shu)字(zi)(zi)電(dian)(dian)位(wei)器(qi)(qi)的不同(tong)，抽頭電(dian)(dian)流最大值可以(yi)從幾百微(wei)安(an)到幾個毫安(an)。下面介紹幾種(zhong)常用(yong)數(shu)(shu)字(zi)(zi)電(dian)(dian)位(wei)器(qi)(qi)芯片：

1、數字電位器MAX5432/5433

MAX5432/5433的(de)(de)(de)(de)端到端電(dian)(dian)阻分(fen)別為50kΩ及100kΩ，端到端的(de)(de)(de)(de)電(dian)(dian)阻溫度(du)系(xi)數(shu)標稱(cheng)值為35ppm/℃，比例溫度(du)系(xi)數(shu)只(zhi)有(you)5ppm/℃，可(ke)應用于需(xu)要低溫度(du)系(xi)數(shu)可(ke)變電(dian)(dian)阻的(de)(de)(de)(de)電(dian)(dian)路中，例如低漂移、可(ke)編程(cheng)增(zeng)益放大器電(dian)(dian)路。芯片采用8引腳(jiao)TDFN封裝，具(ju)有(you)一個散熱功能的(de)(de)(de)(de)接(jie)地焊接(jie)點EP，將該(gai)點焊接(jie)在(zai)具(ju)有(you)適(shi)當面積(ji)的(de)(de)(de)(de)印板銅皮上，使芯片可(ke)工作在(zai)-40℃：至+85℃擴展級溫度(du)范圍(wei)。

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2、數字電位器MAX5438

MAX5438是MAXIM公司(si)生產的(de)(de)7位128階(jie)數(shu)字電(dian)(dian)(dian)(dian)(dian)位器(qi)。它由1個(ge)(ge)7位移位寄(ji)存(cun)器(qi)，1個(ge)(ge)7位數(shu)據(ju)(ju)鎖存(cun)器(qi)，模(mo)塊(kuai)，電(dian)(dian)(dian)(dian)(dian)位器(qi)和(he)控制(zhi)時(shi)鐘(zhong)邏輯(ji)組成。MAX5438的(de)(de)控制(zhi)信(xin)(xin)號包括3個(ge)(ge)輸(shu)入信(xin)(xin)號：芯片選擇(ze)（/CS），數(shu)據(ju)(ju)輸(shu)入（DIN）和(he)串行(xing)時(shi)鐘(zhong)（SCLK），數(shu)字邏輯(ji)由一個(ge)(ge)2.7V～5.25V的(de)(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)驅動。其內部電(dian)(dian)(dian)(dian)(dian)阻兩(liang)端的(de)(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)由外(wai)部通過VDD及VSS提供，VDD與(yu)VSS之間(jian)的(de)(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)必(bi)須大(da)于9V小(xiao)于31.5V。這(zhe)使得(de)MAX5838在輸(shu)入電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)(de)選擇(ze)上具有很大(da)的(de)(de)靈(ling)活性。同時(shi)，MAX5438的(de)(de)外(wai)部電(dian)(dian)(dian)(dian)(dian)路(lu)非常(chang)簡單(dan)，幾乎不需(xu)要任何外(wai)接元(yuan)件就可實現對(dui)輸(shu)入電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)(de)調節輸(shu)出(chu)。

二、數字電位器芯片選型的要點有哪些

選擇(ze)數字電(dian)(dian)(dian)位(wei)器(qi)芯(xin)片應(ying)考(kao)慮(lv)的方(fang)面(mian)很多，電(dian)(dian)(dian)位(wei)器(qi)的個數，滑片的數目即有(you)(you)多少(shao)級，電(dian)(dian)(dian)阻的阻值，有(you)(you)沒有(you)(you)緩沖觸頭，能(neng)否(fou)記憶(yi)掉(diao)電(dian)(dian)(dian)時的位(wei)置，封裝等。相似于3386電(dian)(dian)(dian)位(wei)器(qi)的封裝及特點，總的來說數字電(dian)(dian)(dian)位(wei)器(qi)芯(xin)片選型主要還是從以下三點進(jin)行考(kao)慮(lv)。

1、數字電位器抽頭的變化形式：系統重新通電時，阻值能夠恢復上一次掉電時的阻值，則要選擇非易失性的數字電位器(qi)。

2、數字電位器電壓：帶(dai)緩(huan)沖器輸出的(de)電位器，輸出是(shi)一個電壓值，而(er)不(bu)是(shi)一個電阻值，這(zhe)時應該(gai)選擇(ze)不(bu)帶(dai)緩(huan)沖器的(de)。

3、數字電位器分辨率：如果系統對分辨率要(yao)求比較高，可選擇滑(hua)片數(shu)目多一(yi)些的電(dian)(dian)位(wei)器，或者(zhe)使用兩個數(shu)字電(dian)(dian)位(wei)器串聯達到其目的。