Rainbow-electronics ADC12020 Manual de usuario

ADC1202012-Bit, 20 MSPS, 185 mW A/D Converter with InternalSample-and-HoldGeneral DescriptionThe ADC12020 is a monolithic CMOS analog-to-digital con-v

Timing Diagram20051709Output TimingTransfer Characteristic20051710FIGURE 1. Transfer CharacteristicADC12020www.national.com 10

ADC12020 Typical Performance Characteristics VA=VD= 5V, VDR= 3.0V, fCLK= 20 MHz,fIN= 10.1 MHz, VREF= 2.0V unless otherwise statedDNL DNL vs. Temperatu

ADC12020 Typical Performance Characteristics VA=VD= 5V, VDR= 3.0V, fCLK= 20 MHz,fIN= 10.1 MHz, VREF= 2.0V unless otherwise stated (Continued)INL vs. C

ADC12020 Typical Performance Characteristics VA=VD= 5V, VDR= 3.0V, fCLK= 20 MHz,fIN= 10.1 MHz, VREF= 2.0V unless otherwise stated (Continued)SNR vs. V

ADC12020 Typical Performance Characteristics VA=VD= 5V, VDR= 3.0V, fCLK= 20 MHz,fIN= 10.1 MHz, VREF= 2.0V unless otherwise stated (Continued)SINAD vs.

ADC12020 Typical Performance Characteristics VA=VD= 5V, VDR= 3.0V, fCLK= 20 MHz,fIN= 10.1 MHz, VREF= 2.0V unless otherwise stated (Continued)SFDR vs.

ADC12020 Typical Performance Characteristics VA=VD= 5V, VDR= 3.0V, fCLK= 20 MHz,fIN= 10.1 MHz, VREF= 2.0V unless otherwise stated (Continued)Spectral

Functional DescriptionOperating on a single +5V supply, the ADC12020 uses apipeline architecture and has error correction circuitry to helpensure maxi

Applications Information (Continued)TABLE 2. Input to Output Relationship —Single-Ended InputVIN+VIN−OutputVCM−VREFVCM0000 0000 0000VCM−VREF/2 VCM0100

Applications Information (Continued)2.2 OEThe OE pin, when high, puts the output pins into a highimpedance state. When this pin is low the outputs are

Ordering InformationIndustrial (−40˚C ≤ TA≤ +85˚C) PackageADC12020CIVY 32 Pin LQFPADC12020CIVYX 32 Pin LQFP Tape and ReelADC12020EVAL Evaluation Board

Applications Information (Continued)20051714FIGURE 5. Differential Drive Circuit of Figure 420051715FIGURE 6. Driving the Signal Inputs with a Transfo

Applications Information (Continued)4.0 POWER SUPPLY CONSIDERATIONSThe power supply pins should be bypassed with a 10 µFcapacitor and with a 0.1 µF ce

Applications Information (Continued)Be especially careful with the layout of inductors. Mutualinductance can change the characteristics of the circuit

Physical Dimensions inches (millimeters) unless otherwise noted32-Lead LQFP PackageOrdering Number ADC12020CIVYNS Package Number VBE32ALIFE SUPPORT PO

Pin Descriptions and Equivalent CircuitsPin No. Symbol Equivalent Circuit DescriptionANALOG I/O2VIN+Non-Inverting analog signal Input. With a 2.0V ref

Pin Descriptions and Equivalent Circuits (Continued)Pin No. Symbol Equivalent Circuit Description14–19,22–27D0–D11Digital data output pins that make u

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, VA=VD= +

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)20051707Note 8: To guarantee accuracy, it is required that |VA–VD| ≤ 100 mV and separate bypass capacitors ar

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