參數(shù)資料
型號(hào): DAC8408FPC
廠商: Analog Devices Inc
文件頁數(shù): 6/16頁
文件大小: 0K
描述: IC DAC 8BIT QUAD W/MEMORY 28PLCC
產(chǎn)品培訓(xùn)模塊: Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝: 39
設(shè)置時(shí)間: 190ns
位數(shù): 8
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 4
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 28-LCC(J 形引線)
供應(yīng)商設(shè)備封裝: 28-PLCC(11.51x11.51)
包裝: 管件
輸出數(shù)目和類型: 4 電流,單極;4 電流,雙極
采樣率(每秒): 5.26M
DAC8408
–14–
REV. A
Figure 11. A Digitally Programmable, Low-Distortion Sinewave Oscillator
A LOW-DISTORTION, PROGRAMMABLE
SINEWAVE OSCILLATOR
By varying the previous state-variable filter topology slightly,
one can obtain a very low distortion sinewave oscillator with
programmable frequency feature as shown in Figure 11. Again,
DAC B and DAC D in tandem control the oscillating frequency
based on the relationship fC = 1/2
πRC. Positive feedback is
accomplished via the 82.5 k
and the 20 k potentiometer.
The Q of the oscillator is determined by the ratio of 10 k
and
475
in series with the FET transistor, which acts as an auto-
matic gain control variable resistor. The AGC action maintains
a very stable sinewave amplitude at any frequency. Again, only
two ICs accomplish a very useful function.
At the highest frequency setting, the harmonic distortion level
measures 0.016%. As the frequencies drop, distortion also drops
to a low of 0.006%. At the lowest frequency setting, distortion
came back up to a worst case of 0.035%.
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