Pico-communications E-14 Manuel d'utilisateur télécharger pdf (Page 13)

E‐14HardwareReferenceManual www.picocomputing.com PicoComputing,Inc.

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AnalogInterface(Optional)

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ThePicoE‐14alsocomesequippedwithtwohigh‐speedanalogconverterseachcapableof14‐bit

resolution.Bydefault,bothanalogconvertersarepowereddownuntilthesleeplinesaredrivenlow

andtheamplifierlinesaredrivenhighbytheFPGA.Bothconvertersarecapacitivelycoupledwithpull‐

downresistorsontheoutputtofilteroutanyDCsignalcomponents.Bothamplifiersareconfigured

forminimumnoiseandunitygain.

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8‐Bit,80MSPSAnalog‐to‐DigitalConverter(ADC)*

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TheADCisconfiguredtoutilizetheinternal1.0Vreferencevoltageandmaximumfullscaleinput,

givingita2Vpk‐pkinput.Currently,theADCissetuptoacceptinputvoltagesbetween0Vand2V.

Clockmodesandinputdataformatissetbythesystemutilizingconfigurationpinsavailabletothe

FPGA.

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8‐Bit,165MSPSDigital‐to‐AnalogConverter(DAC)*

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TheDACisconfiguredtoutilizetheinternal1.2Vreferencevoltageandmaximumfull‐scaleoutput,

givingita2Vpk‐pkoutput.SincetheDACactuallyoutputscomplementarycurrents,theamplifieris

alsoutilizedasacurrenttovoltageconverterandvoltageshifter.Thisallowsthevoltagetobebuffered

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withinthe0Vto3Vrailvoltages.Currently,theDACissetuptooutputbetween.5Vand2.5V.This

givesusacomfortable.5Vbetweenourmaximumoutputsandrailvoltages.Clockmodesandinput

dataformatissetbythesystemutilizingconfigurationpinsavailabletotheFPGA.

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ADC

AMP

Input

DAC

AMP

Output

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Pico-communications E-14 Manuel d'utilisateur Page 13