Rainbow-electronics ADC10D040 Manuel d'utilisateur

ADC10D040Dual 10-Bit, 40 MSPS, 267 mW A/D ConverterGeneral DescriptionThe ADC10D040 is a dual low power, high performanceCMOS analog-to-digital conver

AC Electrical Characteristics OS = High (Parallel Mode)The following specifications apply for VA=VD= +3.3 VDC,VDR= +2.5VDC,VREF= 1.4 VDC, GAIN = OF =

AC Electrical Characteristics OS = High (Parallel Mode) (Continued)20029706Note 8: Typical figures are at TJ= 25˚C, and represent most likely parametr

Timing Diagrams20029708ADC10D040 Timing Diagram for Multiplexed Mode20029707ADC10D040 Timing Diagram for Parallel ModeADC10D040www.national.com 12

Timing Diagrams (Continued)20029709FIGURE 1. AC Test CircuitADC10D040www.national.com13

Specification DefinitionsAPERTURE (SAMPLING) DELAY is that time required afterthe fall of the clock input for the sampling switch to open. TheSample/H

Typical Performance Characteristics VA=VD= 3.3V, VDR= 2.5V, fCLK= 40 MHz, fIN= 10.4 MHz,unless otherwise specifiedTypical INL INL vs. VA20029782200297

Typical Performance Characteristics VA=VD= 3.3V, VDR= 2.5V, fCLK= 40 MHz, fIN= 10.4 MHz,unless otherwise specified (Continued)Typical DNL DNL vs. VA20

Typical Performance Characteristics VA=VD= 3.3V, VDR= 2.5V, fCLK= 40 MHz, fIN= 10.4 MHz,unless otherwise specified (Continued)DNL vs. Clock Duty Cycle

Typical Performance Characteristics VA=VD= 3.3V, VDR= 2.5V, fCLK= 40 MHz, fIN= 10.4 MHz,unless otherwise specified (Continued)SNR, SINAD & SFDR vs

Typical Performance Characteristics VA=VD= 3.3V, VDR= 2.5V, fCLK= 40 MHz, fIN= 10.4 MHz,unless otherwise specified (Continued)Total Power vs. TEMP Spe

Connection Diagram20029701TOP VIEWOrdering InformationIndustrial Temperature Range(−40˚C ≤ TA≤ +85˚C)NS PackageADC10D040CIVS TQFPADC10D040EVAL Evaluat

Functional DescriptionUsing a subranging architecture, the ADC10D040 achieves9.4 effective bits over the entire Nyquist band at 40 MSPSwhile consuming

Applications Information (Continued)variability. The reference voltage at the VREFpin should bebypassed to AGND witha5µF(orlarger) tantalum orelectrol

Applications Information (Continued)20029772FIGURE 5. Improved Low Component Count Reference BiasingADC10D040www.national.com 22

Applications Information (Continued)20029773FIGURE 6. Setting An Accurate Reference VoltageADC10D040www.national.com23

Applications Information (Continued)The VCMOoutput can be used as the ADC reference sourceas long as care is taken to prevent excessive loading of thi

Applications Information (Continued)2.2 VCMOOutputThe VCMOoutput pin is intended to provide a common modebias for the differential input pins of the A

Applications Information (Continued)TABLE 1. ADC10D040 Input/Output RelationshipsGAIN OF I+ / Q+ I− / Q− Output Code00VCM+ 0.25*VREFVCM− 0.25*VREF11 1

Applications Information (Continued)7.0 DYNAMIC PERFORMANCEThe ADC10D040 is a.c. tested and its dynamic performanceis guaranteed. To meet the publishe

Physical Dimensions inches (millimeters) unless otherwise notedNOTES UNLESS OTHERWISE SPECIFIED1. STANDARD LEAD FINISH7.62 MICROMETERS MINIMUM SOLDER

Block Diagram20029702Pin Descriptions and Equivalent CircuitsPin No. Symbol Equivalent Circuit Description4847I+I−Analog inputs to “I” ADC. With VREF=

Pin Descriptions and Equivalent Circuits (Continued)Pin No. Symbol Equivalent Circuit Description45 VCMOThis is an analog output which can be used as

Pin Descriptions and Equivalent Circuits (Continued)Pin No. Symbol Equivalent Circuit Description33 CLKDigital clock input for both converters. The an

Pin Descriptions and Equivalent Circuits (Continued)Pin No. Symbol Equivalent Circuit Description4VDDigital supply pin. This pin should be connected t

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=VD= +3.3 VDC,VDR= +2.5 VDC,VREF= 1.4 VDC, GAIN = OF = 0V, OS

Converter Electrical Characteristics (Continued)The following specifications apply for VA=VD= +3.3 VDC,VDR= +2.5 VDC,VREF= 1.4 VDC, GAIN = OF = 0V, OS