- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375232 > AD526 (Analog Devices, Inc.) Software Programmable Gain Amplifier(軟件可編程增益放大器) PDF資料下載
參數(shù)資料
| 型號(hào)： | AD526 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Software Programmable Gain Amplifier(軟件可編程增益放大器) |
| 中文描述： | 軟件可編程增益放大器（軟件可編程增益放大器） |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 397K |
| 代理商： | AD526 |
AD526
REV. C
–11–
Figure 42. Floating-Point A/D Converter
HIGH ACCURACY A/D CONVE RT E RS
Very high accuracy and high resolution floating-point A/D con-
verters can be achieved by the incorporation of offset and gain
calibration routines. T here are two techniques commonly used
for calibration, a hardware circuit as shown in Figure 43 and/or
a software routine. In this application the microprocessor is
functioning as the autoranging circuit, requiring software over-
head; therefore, a hardware calibration technique was applied
which reduces the software burden. T he software is used to set
the gain of the AD526. In operation the signal is converted, and
if the MSB of the AD574 is not equal to a logical 1, the gain is
increased by binary steps, up to the maximum gain. T his maxi-
mizes the full-scale range of the conversion process and insures
a wide dynamic range.
T he calibration technique uses two point correction, offset and
gain. T he hardware is simplified by the use of programmable
magnitude comparators, the 74ALS528s, which can be
“burned” for a particular code. In order to prevent under or
over range hunting during the calibration process, the reference
offset and gain codes should be different from the endpoint
codes. A calibration cycle consists of selecting whether gain or
offset is to be calibrated then selecting the appropriate multi-
plexer channel to apply the reference voltage to the signal chan-
nel. Once the operation has been initiated, the counter, a
74ALS869, drives the D/A converter in a linear fashion provid-
ing a small correction voltage to either the gain or offset trim
point of the AD574. T he output of the A/D converter is then
compared to the value preset in the 74ALS528 to determine a
match. Once a match is detected, the 74ALS528 produces a low
going pulse which stops the counter. T he code at the D/A con-
verter is latched until the next calibration cycle. Calibration
cycles are under the control of the microprocessor in this appli-
cation and should be implemented only during periods of con-
verter inactivity.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD5290 | Compact +30V/【15V 256-Position Digital Potentiometer |
| AD5290EVAL | Compact +30V/【15V 256-Position Digital Potentiometer |
| AD5290YRMZ10 | Compact +30V/【15V 256-Position Digital Potentiometer |
| AD5290YRMZ100 | Compact +30V/【15V 256-Position Digital Potentiometer |
| AD5290YRMZ100-RL7 | Compact +30V/【15V 256-Position Digital Potentiometer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD5260 | 制造商:AD 制造商全稱:Analog Devices 功能描述:8-Bit Dual Nonvolatile Memory Digital Potentiometer |
| AD5260_10 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1-/2-Channel 15 V Digital Potentiometer |
| AD5260BRU20 | 制造商:Analog Devices 功能描述:Digital Potentiometer 256POS 20KOhm Single 14-Pin TSSOP 制造商:Analog Devices 功能描述:IC DIGITAL POTENTIOMETER 8-BIT |
| AD5260BRU200 | 制造商:Analog Devices 功能描述:Digital Potentiometer 256POS 200KOhm Single 14-Pin TSSOP 制造商:Analog Devices 功能描述:IC DIGITAL POTENTIOMETER 8-BIT |
| AD5260BRU200-REEL7 | 制造商:Analog Devices 功能描述:Digital Potentiometer 256POS 200KOhm Single 14-Pin TSSOP T/R 制造商:Rochester Electronics LLC 功能描述:8-BIT SPI DIG POT - Tape and Reel |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。