Rainbow-electronics ADC12D040 Bedienungsanleitung Seite 1

ADC12D040Dual 12-Bit, 40 MSPS, 600 mW A/D Converter withInternal/External ReferenceGeneral DescriptionThe ADC12D040 is a dual, low power monolithic CM

Specification DefinitionsAPERTURE DELAY is the time after the rising edge of theclock to when the input signal is acquired or held for conver-sion.APE

Timing Diagram20046009Output TimingTransfer Characteristic20046010FIGURE 1. Transfer CharacteristicADC12D040www.national.com11

Typical Performance Characteristics VA=VD= 5V, VDR= 3V, fCLK= 40 MHz, fIN= 10 MHz unlessotherwise statedSpectral Response@Fin = 9.95 MHz,FCLK=40MHzIMD

Typical Performance Characteristics VA=VD= 5V, VDR= 3V, fCLK= 40 MHz, fIN= 10 MHz unlessotherwise stated (Continued)INL & DNL vs. Temperature DNL

Typical Performance Characteristics VA=VD= 5V, VDR= 3V, fCLK= 40 MHz, fIN= 10 MHz unlessotherwise stated (Continued)SNR, SINAD, SFDR vs. Clock Frequen

Typical Performance Characteristics VA=VD= 5V, VDR= 3V, fCLK= 40 MHz, fIN= 10 MHz unlessotherwise stated (Continued)Distortion vs. Clock Frequency Dis

Functional DescriptionOperating on a single +5V supply, the ADC12D040 uses apipeline architecture and has error correction circuitry to helpensure max

Applications Information (Continued)TABLE 1. Input to Output Relationship —Differential InputVIN+VIN−Binary Output2’s ComplementOutputVCM−VREF/2VCM+VR

Applications Information (Continued)20046013FIGURE 4. Application Circuit using Transformer or Differential Op-Amp Drive CircuitADC12D040www.national.

Applications Information (Continued)TABLE 3. Resistor Values for Circuit of Figure 5SIGNALRANGER1 R2 R3 R4 R5, R60 - 0.25V 140Ω 768Ω 226Ω 412Ω 2000Ω0

Connection Diagram20046001Ordering InformationIndustrial (−40˚C ≤ TA≤ +85˚C) PackageADC12D040CIVS 64 Pin TQFPADC12D040CIVSX 64 Pin TQFP Tape and ReelA

Applications Information (Continued)2.2 OEA, OEBThe OEA or OEB pin, when high, puts the output pins into ahigh impedance state. When this pin is low t

Applications Information (Continued)other lines can introduce jitter into the clock line, which canlead to degradation of SNR. Also, the high speed cl

Applications Information (Continued)7.0 COMMON APPLICATION PITFALLSDriving the inputs (analog or digital) beyond the powersupply rails. For proper ope

Physical Dimensions inches (millimeters) unless otherwise noted64-Lead TQFP PackageOrdering Number ADC12D040CIVSNS Package Number VECO64ALIFE SUPPORT

Block Diagram20046002ADC12D040www.national.com3

Pin Descriptions and Equivalent CircuitsPin No. Symbol Equivalent Circuit DescriptionANALOG I/O152VINA+VINB+Non-Inverting analog signal Inputs. With a

Pin Descriptions and Equivalent Circuits (Continued)Pin No. Symbol Equivalent Circuit Description24–2934–39DA0–DA11Digital data output pins that make

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)Unless otherwise specified, the following specifications apply for AGND = DGND = DR GND = 0V, VAVD+5V,

DC and Logic Electrical Characteristics (Continued)Unless otherwise specified, the following specifications apply for AGND = DGND = DR GND = 0V, VA=VD

AC Electrical Characteristics (Continued)input voltage must be ≤4.85V to ensure accurate conversions.20046007Note 8: To guarantee accuracy, it is requ