ADC0858CIN ,8-Bit Analog Data Acquisition and Monitoring Systemsapplications softwarecrossed which limits.Y2 (ADC0851) or 8 (ADC0858) analog input channelsThe adva ..
ADC0882CCN ,8-Bit 20 MSPS Flash A/D ConverterBlock Diagram
NMINV
NLINV
CONV
VIN
RT
TL/H/11083-1
©1990 National Semiconductor Go ..
ADC08831IM ,8-Bit Serial I/O CMOS A/D Converters with Multiplexer and Sample/Hold FunctionGeneral Descriptionn InstrumentationThe ADC08831/ADC08832 are 8-bit successive approxima-n Embedded ..
ADC08831IMX ,8-Bit Serial I/O CMOS A/D Converters with Multiplexer and Sample/Hold FunctionFeaturesrial I/O will interface to COPS family of micro-controllers,PLD’s, microprocessors, DSP’s, ..
ADC08831IN ,8-Bit Serial I/O CMOS A/D Converters with Multiplexer and Sample/Hold FunctionADC08831/ADC08832 8-Bit Serial I/O CMOS A/D Converters with Multiplexer and Sample/HoldFunctionSept ..
ADC08831IWM ,8-Bit Serial I/O CMOS A/D Converters with Multiplexer and Sample/Hold FunctionGeneral Descriptionn InstrumentationThe ADC08831/ADC08832 are 8-bit successive approxima-n Embedded ..
ADUC814ARU ,Precision Analog Microcontroller: 1.3MIPS 8052 MCU + 8kB Flash + 6-Ch 12-Bit ADC + Dual 12-Bit DACOverview........ 21 Programming a Byte........ 33 ADC Transfer Function....... 21 User Interface to ..
ADUC814ARUZ , MicroConverter®, Small Package 12-Bit ADC with Embedded Flash MCU
ADUC814BRU ,MicroConverter/ Small Package 12-Bit ADC with Embedded Flash MCUOverview........ 21 Programming a Byte........ 33 ADC Transfer Function....... 21 User Interface to ..
ADUC816BCP ,Precision Analog Microcontroller: 1MIPS 8052 MCU + 8kB Flash + Dual 16-Bit ADC + 12-Bit DACOVERVIEW OF MCU-RELATED SFRS . . . . . . . . . . . . . . . . . . 23SERIAL PERIPHERAL INTERFACE . . ..
ADUC824BCP ,Precision Analog Microcontroller: 1MIPS 8052 MCU + 8kB Flash + 16/24-Bit ADC + 12-Bit DACOVERVIEW OF MCU-RELATED SFRS 23On-Chip PLL ... 42Accumulator (ACC) .. 23Time Interval Counter (TIC) ..
ADUC824BS ,Precision Analog Microcontroller: 1MIPS 8052 MCU + 8kB Flash + 16/24-Bit ADC + 12-Bit DACSPECIFICATIONSConversion Rate 5.4 On Both Channels Hz min105 Programmable in 0.732 ms Increments Hz ..
ADC0858CIN
8-Bit Analog Data Acquisition and Monitoring Systems
TL/H/11021
ADC0851
and
ADC0858
8-Bit
Analog
Data
Acquisition
and
Monitoring
Systems
January 1995
ADC0851 and ADC0858 8-Bit Analog Data
Acquisition and Monitoring Systems
General Description
The ADC0851and ADC0858are2and8 input analog data
acquisition systems. Theycan function asconventional mul-
tiple input A/D converters, automaticscanning A/D convert-
ersor programmable analog ‘‘watchdog’’ systems.In
‘‘watchdog’’ mode they monitor analog inputs and deter-
mine whether these inputsare insideor outside user pro-
grammed window limits. This monitoring process takes
place independentofthe host processor. Whenany input
falls outsideofits programmed window limits,an interruptis
automatically generated which flagsthe processor;the chip
can thenbe interrogatedasto exactly which channels
crossed which limits.
The advantageofthis approachisthatits freesthe proces-
sor from havingto frequently monitor analog variables.It
can consequently save havingto insert many A/D subrou-
tine calls throughout real time application code.In control
systems where many variablesare continually being moni-
toredthiscan significantly freeupthe processor, especiallythe variablesareDCor slow varying signals.
The Auto A/D conversion feature allowsthe deviceto scan
through selected input channels,performingan A/D conver-
sionon each channel withoutthe needto selecta new
channel after each conversion.
Applications Instrumentation monitoringand process control Digitizing automotive sensor signals Embedded diagnostics
Key Specifications Resolution 8Bits Total error g(/2 LSBorg1 LSB Low power 50 mW Conversion time 18 ms/Channel Limit comparison time 2 ms/Limit
Features Watchdog operation signals processor whenany
channelis outside user programmed window limits Frees microprocessor from continually monitoring
analog signals and simplifies applications software2 (ADC0851)or8 (ADC0858) analog input channels Single endedor differential input pairs COM inputforDC offsettingof input voltage4 (ADC0851) and16 (ADC0858), 8-bit programmable
limits NSC MICROWIRETM interface Powerfail detection Auto A/D conversion feature Single5V supply Window limitsare user programmablevia serial inter-
face
Simplified Block Diagram
TL/H/11021–22
FIGURE1
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
MICROWIRETMis atrademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M75/PrintedinU.S.A.
