本指南討論最基本的DAc架構:“串”DAc和“溫度計”DAc。串DAc的起源與開爾文爵士有 關,他于19世紀中葉發明了開爾文分壓器。串DAc在當今頗受歡迎,特別是在典型分辨率 為6到8位的數字電位計等應用中。溫度計DAc則相對獨立于代碼相關的開關毛刺,因而是 低失真分段DAc和流水線式ADC的常用構建模塊。
上傳時間: 2013-10-14
上傳用戶:zhqzal1014
ADC需要FFT處理器來評估頻譜純度,DAc則不同,利用傳統的模擬頻譜分析儀就能直接 研究它所產生的模擬輸出。DAc評估的挑戰在于要產生從單音正弦波到復雜寬帶CDMA信 號的各種數字輸入。數字正弦波可以利用直接數字頻率合成技術來產生,但更復雜的數字 信號則需要利用更精密、更昂貴的字發生器來產生。 評估高速DAc時,最重要的交流性能指標包括:建立時間、毛刺脈沖面積、失真、無雜散 動態范圍(SFDR)和信噪比(SNR)。本文首先討論時域指標,然后討論頻域指標。
上傳時間: 2013-10-27
上傳用戶:Vici
介紹了一款不要求負參考電壓 (VREF) 的電流源 DAc/運算放大器接口。盡管該建議電路設計提供了一款較好的有效解決方案,但必須注意的是:如果 DAc 的最大兼容電壓作為運算放大器輸入 (VDAc+) 正端的設計目標,則負端 (VDAc–) 的 DAc 電壓將會違反最大兼容輸出電壓,因為存在最初并不那么明顯的偏置。下面的討論,將對出現這種偏置的原因進行解釋,并提出一種解決問題的簡單方法。之后,我們將討論在 DAc 和運算放大器之間插入一個濾波器的方法。
上傳時間: 2013-10-22
上傳用戶:gut1234567
圖1所示電路采用digiPOT+系列數字電位計AD5292、雙通道運算放大器ADA4091-2和基準電壓源ADR512,提供一種低成本、高電壓、單極性DAc。該電路提供10位分辨率,輸出電壓范圍為0 V至30 V,能夠提供最高±20 mA的輸出電流。AD5292可以通過SPI兼容型串行接口編程。
上傳時間: 2013-11-23
上傳用戶:yuhaihua_tony
CS4398的DAc原理圖
上傳時間: 2013-10-24
上傳用戶:zoudejile
Abstract: This application note describes how sampling clock jitter (time interval error or "TIE jitter") affectsthe performance of delta-sigma digital-to-analog converters (DAcs). New insights explain the importanceof separately specifying low-frequency (< 2x passband frequency) and high-frequency or wideband (> 2xpassband frequency) jitter tolerance in these devices. The article also provides an application example ofa simple highly jittered cycle-skipped sampling clock and describes a method for generating a properbroadband jittered clock. The document then goes on to compare Maxim's audio DAc jitter tolerance tocompetitor audio DAcs. Maxim's exceptionally high jitter tolerance allows very simple and low-cost sampleclock implementations.
上傳時間: 2013-10-25
上傳用戶:banyou
TLV5616 12 位 3微秒 DAc 串行輸入可編程設置時間 功耗
上傳時間: 2013-11-02
上傳用戶:xinyuzhiqiwuwu
Abstract: A laser module designer can use a fixed resistor, mechanical pot, digital pot, or a digital-to-analogconverter (DAc) to control the laser driver's modulation and bias currents. The advantages of a programmablemethod (POT or DAc) are that the manufacturing process can be automated and digital control can be applied(e.g., to compensate for temperature). Using POTs can be a more simple approach than a DAc. There can be aslight cost advantage to using a POT, but this is usually not significant relative to other pieces of the design.Using a DAc can offer advantages, including improved linearity (translating to ease of software implementationand ability to hit the required accuracy), increased board density, a wider range of resolutions, a betteroptimization range, ease of use with a negative voltage laser driver, and unit-to-unit consistency
上傳時間: 2013-11-13
上傳用戶:ca05991270
Abstract: This article discusses application circuits for Maxim force/sense digital-to-analog converters (DAcs). Applications include:selectable fixed-gain DAc, programmable gain DAc, photodiode bias control, amperometric sensor control, digitally programmablecurrent source, Kelvin load sensing, temperature sensing, and high current DAc output. A brief description of the various DAc outputconfigurations is also given.
標簽: DAc
上傳時間: 2013-11-04
上傳用戶:youmo81
Abstract: Using a DAc and a microprocessor supervisor, the system safety can be improved in industrial controllers, programmablelogiccontrollers (PLC), and data-acquisition systems. The analog output is set to zero-scale (or pin-programmable midscale) when amicroprocessor failure, optocoupler failure, or undervoltage condition occurs. A simple application is shown on how to implement thisfunction.
上傳時間: 2013-10-17
上傳用戶:sjb555