Rainbow-electronics ADC10321 Manual do Utilizador Página 1

ADC1032110-Bit, 20MSPS, 98mW A/D Converter with InternalSample and HoldGeneral DescriptionThe ADC10321 is a low power, high performance CMOSanalog-to-

Specification DefinitionsAPERTURE JITTER is the variation in aperture delay fromsample to sample. Aperture jitter shows up as input noise.APERTURE DEL

Timing Diagram10089715FIGURE 1. ADC10321 Timing Diagram10089717FIGURE 2. AC Test Circuit10089716FIGURE 3. tEN,tDISTest CircuitADC10321www.national.com

Functional DescriptionThe ADC10321 maintains excellent dynamic performancefor input signals up to half the clock frequency. The use of aninternal samp

Applications Information (Continued)10089718FIGURE 4. Simple, low component count reference biasingADC10321www.national.com13

Applications Information (Continued)The VREF+ F and VREF− F pins should each be bypassed toAGND with 10µF tantalum or electrolytic and 0.1µF ceramicca

Applications Information (Continued)3.0 POWER SUPPLY CONSIDERATIONSA/D converters draw sufficient transient current to corrupttheir own power supplies

Applications Information (Continued)The clock line should be series terminated at the source endin the characteristic impedance of that line. Use a se

Applications Information (Continued)6.0 DYNAMIC PERFORMANCEThe ADC10321 is ac tested and its dynamic performance isguaranteed. To meet the published s

Physical Dimensions inches (millimeters) unless otherwise noted32-Lead TQFP PackageOrdering Number ADC10321CIVTNS Package Number VBE32ALIFE SUPPORT PO

Connection Diagram10089701Ordering InformationCommercial(−40˚C ≤ TA≤ +85˚C) NS PackageADC10321CIVT TQFPBlock Diagram10089702ADC10321www.national.com 2

Pin Descriptions and Equivalent CircuitsPinNo. Symbol Equivalent CircuitDescriptionAnalog I/O30 VINAnalog Input signal to be converted. Conversionrang

Pin Descriptions and Equivalent Circuits (Continued)PinNo. Symbol Equivalent CircuitDescription5, 10 VDPositive digital supply pins. These pins should

Absolute Maximum Ratings (Notes 1,2)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distri

Converter Electrical Characteristics (Continued)The following specifications apply for VA= +5.0VDC,VD= 5.0VDC,VDI/O = 5.0VDC,VREF+ = +3.5VDC,VREF− = +

AC Electrical Characteristics (Continued)The following specifications apply for VA= +5.0VDC,VDI/O = 5.0VDC,VREF+ = +3.5VDC,VREF− = +1.5VDC,fCLK= 20MHz

AC Electrical Characteristics (Continued)1008971110089712 10089724Note 8: Typical figures are at TA=TJ= 25˚C, and represent most likely parametric nor

Typical Performance Characteristics VA=VD=VDI/O = 5V, fCLK= 20MHz, unless otherwisespecified. (Continued)SINAD & ENOB vs VASINAD & ENOB vsfCLK