ABCs of ADCs - Analog-to-Digital Converter Basics (PDF)

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Summary - ABCs of ADCs• The ADC• Review of Definitions• Sources of Distortion and Noise• Common Design Mistakes• ADCs from National Semiconductor60We have discussed the Analog-to-Digital Converter and its specifications. We talked aboutproblem sources and how to get around them and ended up with a summary of NationalSemiconductor’s high speed ADC offering.ABCs of ADCs - Rev 3, June 2006Authored by: Nicholas “Nick” Gray60Copyright © 2003, 2004, 2006 National SemiconductorCorporationAll rights reserved
ADC Web Site• Site: www.national.com/appinfo/adc– shortcut: www.national.com/adc– shorter cut: www.nsc.com/adc• Link to Selection Guides– General Purpose/Industrial– High Speed• Reference Material– Application Notes– Articles• Evaluation Board Material– Eval Board Descriptions– Manuals– WaveVision Software Download• Competitive Cross Reference61ABCs of ADCs - Rev 3, June 2006Authored by: Nicholas “Nick” Gray61Copyright © 2003, 2004, 2006 National SemiconductorCorporationAll rights reserved
Page 1 and 2:
ABCs of ADCsAnalog-to-Digital Conve
Page 3 and 4:
What Is an ADC?• Mixed-Signal Dev
Page 5 and 6:
Least Significant Bit (LSB)andMost
Page 7 and 8:
Quantization Error111Digital Output
Page 9 and 10: Offset Error111OUTPUT CODE110101100
Page 11 and 12: Gain Error (Full-Scale GainError)Ga
Page 13 and 14: DNL1111101010.3 LSB;DNL = -0.7Ideal
Page 15 and 16: Integral Non-Linearity (INL)orInteg
Page 17 and 18: Total Unadjusted Error101OUTPUT COD
Page 19 and 20: THD - Total HarmonicDistortionAnalo
Page 21 and 22: 1Signal-to-Noise and Distortion(SIN
Page 23 and 24: ENOB - Effective Number OfBits• E
Page 25 and 26: Input Dynamic RangeDynamic Range is
Page 27 and 28: Sources of Noiseand DistortionABCs
Page 29 and 30: Inadequate Supply Bypassing• Nois
Page 31 and 32: V A - DR Decoupling• ADC Outputs
Page 33 and 34: Output to Input Coupling• Output
Page 35 and 36: Noisy Components/Circuitry• ADC I
Page 37 and 38: Clock Noise• Clock Can Add Noise
Page 39 and 40: Common Design Mistakes• Inadequat
Page 41 and 42: Noisy Components/Circuitry• ADC I
Page 43 and 44: Better Conditioning Circuitry22 220
Page 45 and 46: Resistor Pack Danger500*V REF +V RE
Page 47 and 48: Clock Noise• Clock Can Add Noise
Page 49 and 50: Excessive Clock Jitter (cont’d)No
Page 51 and 52: Treating the Clock LineAs a Trace
Page 53 and 54: A Better Reference CircuitLM4040-4.
Page 55 and 56: High Speed ADCs FromNational: 10-bi
Page 57 and 58: High Speed ADCs FromNational: 14 &
Page 59: Other General Purpose ADCsFrom Nati
Page 63 and 64: Absolute Maximum Ratings - Voltages
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ABCs of ADCs - Analog-to-Digital Converter Basics (PDF)

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