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E‐14HardwareReferenceManual www.picocomputing.com PicoComputing,Inc.
13
AnalogInterface(Optional)
ThePicoE‐14alsocomesequippedwithtwohigh‐speedanalogconverterseachcapableof14‐bit
resolution.Bydefault,bothanalogconvertersarepowereddownuntilthesleeplinesaredrivenlow
andtheamplifierlinesaredrivenhighbytheFPGA.Bothconvertersarecapacitivelycoupledwithpull‐
downresistorsontheoutputtofilteroutanyDCsignalcomponents.Bothamplifiersareconfigured
forminimumnoiseandunitygain.
8‐Bit,80MSPSAnalog‐to‐DigitalConverter(ADC)*
TheADCisconfiguredtoutilizetheinternal1.0Vreferencevoltageandmaximumfullscaleinput,
givingita2Vpk‐pkinput.Currently,theADCissetuptoacceptinputvoltagesbetween0Vand2V.
Clockmodesandinputdataformatissetbythesystemutilizingconfigurationpinsavailabletothe
FPGA.
8‐Bit,165MSPSDigital‐to‐AnalogConverter(DAC)*
TheDACisconfiguredtoutilizetheinternal1.2Vreferencevoltageandmaximumfull‐scaleoutput,
givingita2Vpk‐pkoutput.SincetheDACactuallyoutputscomplementarycurrents,theamplifieris
alsoutilizedasacurrenttovoltageconverterandvoltageshifter.Thisallowsthevoltagetobebuffered
withinthe0Vto3Vrailvoltages.Currently,theDACissetuptooutputbetween.5Vand2.5V.This
givesusacomfortable.5Vbetweenourmaximumoutputsandrailvoltages.Clockmodesandinput
dataformatissetbythesystemutilizingconfigurationpinsavailabletotheFPGA.
ADC
AMP
Input
DAC
AMP
Output