[PDF] ADCPro(TM) Analog-to-Digital Converter Evaluation Software Users

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ADCPro™User'sGuide

Contents

ADCProScreenCaptureofADCProScreenExitAlt+QEVMTestToolsSettingsConfigurationSettingsFigure10.ADCProConfigurationSettingsMenuHelpAboutADCPro...ContactUsAboutADCPro...ContactUs3.4EVMPlug-Ins - GettingDataIntoADCPro

ADCPro3.4.3OtherEVMPlug-Ins3.5TestPlug-Ins - AnalyzingandSavingDataAcquireContinuousTestFigure14.SelectingaTestPlug-InAcquireF5ContinuousF6ContinuousThemaximumblocksizeforanytestis1,048,576samplesperchannel.ADCPro™UserGuideSubmitDocumentationFeedback

ADCProFigure19.EquationEditorScreen - ExampleEquation+-*/^2+3*6=20(2+3)*6=30MUSTCustomUnitsCloseUnitsFigure20.MultiscopeDisplayScreenwithCustomEquationADCPro™UserGuideSubmitDocumentationFeedback

ADCPro3.5.4MultiFFT

ADCPro

THD SINAD

Tone,HzSFDR

ADCProPlotAllDisplayOnlyPlotAllHarmonics

ADCProTable1.SampleTab-DelimitedTextFile

000

Analog Input Voltage001

010011100101110111

Digital

Output

CodeFS1/2 FS 3/4 FS1/4 FS0

Transition point= where

output code changes from one code to an adjacent code

Ideal transfer function

for a 3-bit A/D

Transition

Points

code width

Ideal code width=

1LSB

Ideal Straight Line

Center

Digital Output

Code

0...101

0...100

0...011

0...010

0...001

0...000

0 15432

+1/2 LSB ?1/2 LSB0 15432Step Width (1LSB)

Analog Input

Value

Midstep Value

of 0...011

Quantization

Error

Analog Input

Value

Inherent Quantization Error ( 1/2 LSB)±

Actual

Transfer

FunctionIdeal

Transfer

Function

Offset Error

Offset errors can be

corrected in software or hardware. 000

Analog Input Voltage001

010011100101110111

Digital

Output

CodeFS1/2 FS 3/4 FS1/4 FS0

Offset Error= Difference

between the actual ( line) first transition point and the ideal ( line) first transition point.dashed solid

First (Ideal)

Code

Transition

Offset Error = (V[0:1] 0.5V )?1LSBV =1LSB= Ideal LSB Voltage SizeVREF 2n

000001010011100101110111

Digital

Output

Code

Actual full-scale rangeIdeal full-scale range

Actual

Transfer

Function

Ideal

Transfer

Function

Full?scale range=

Difference between the First

and Last Code Transition Points

Gain Error=

Full-scale Error Offset Error-

Gain errors can be corrected

in firmware.

1LSB =VFS

2n 000

Analog Input Voltage001

010011100101110111

Digital

Output

Code

Narrow code (<1 LSB)Wide code (>1 LSB)

Actual

Transfer

Function

Ideal

Transfer

Function

000

Analog Input Voltage001

010011100101110111

Digital

Output

Code

INL < 0

Actual

Transfer

Function

Ideal

Transfer

FunctionINL < 0

INL= maximum deviation

between an ( line) code transition point and its corresponding ( line) transition point, after gain and offset error have been removed.actual dashed ideal solid

PositiveINL means

transition(s) later than ideal

NegativeINL means

transition(s) earlier than ideal

A: Fundamental Signal Magnitude

B: Headroom = 0.5dB

C. Signal-to-Noise Ratio = 85dB

D: Spurious Free Dynamic Range = 96dB

E: Average Noise Floor = 125dB

F: First Harmonic Magnitude = 105dB

G: Second Harmonic Magnitude = 96dB?

AB C D E F G 0 ?20 ?40 ?60 ?80 ?100 ?120 ?140 ?160

Amplitude (dB)

0 10 20 30 40 50

Frequency (kHz)FREQUENCY SPECTRUM

(8192 point FFT, F = 10.0022kHz, 0.2dB) IN? 1.0 0.5 0 ?0.5 ?1.0

Magnitude (dB)

TYPICAL SINE WAVE

(10kHz) ?20 0 20 40 60

Frequency (kHz)80 1000 0.05 0.10 0.15 0.20

Time (ms)0.25 0.30 0.35 0.40

40
20 0 ?20 ?40 ?60 ?80 ?100

Magnitude (dB)

SFDR

2F0 3F0 4F0 5F0 6F0 7F0 8F0 9F0

Harmonic BinsFundamental (F0)

ENOB =(SINAD 1.76dB)?

6.022 =ENOBFull-scale

Noise2

M s(ADC Codes)=1LSB =VFS

2nENOB = M log ( )? s2SNR = 20 log = 6.02 N1

NoiseENOB = N = 20 log6.02

1 ppm

ENOB = 20 log = 21.3 Bits6.02

1

0.4e-6

THD =?100%ErmsN

i = 1 å1

N[E (i)]L2

THD+N =?100%ErmsN

i = 1 å1

N[E (i) + E (i) + E (i)]L Q N2

INL vs CODE

INL (LSB)

Code4 3 2 1 0 ?1 ?2 ?3 ?4 ?131072?31072 18928 68928?81072118928 ADC Under Test

DACSUB N

1

ADDERADD N

1

A < BWord Comparator

N1N1 k N DAC

A BReference

Code k IN

Trig 1Clock

Voltmeter

Spectrum

Analyzer

Optional

Required

N = NCYC Sf

IN f S

Input Data

x(n)

Window Function

w(n)

Windowed Input Data

w(n) x(n)?t t t n = 0n = N 1?

Data Window

RFIDwww.ti-rfid.com

OMAPMobileProcessorswww.ti.com/omap

TIE2ECommunityHomePagee2e.ti.com

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