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ADC08234CIWM-ADC08238CIN
8-Bit 2 ms Serial I/O A/D Converters with MUX/ Reference/ and Track/Hold
TL/H/11015
ADC08231/ADC08234/ADC08238
8-Bit
Serial
I/O
A/D
Converters
with
MUX,
Reference,
and
Track/Hold
December 1994
ADC08231/ADC08234/ADC08238 8-Bit2 ms Serial I/O
A/D Converters with MUX, Reference, and Track/Hold
General Description
The ADC08231/ADC08234/ADC08238are 8-bit succes-
sive approximation A/D converters with serialI/Oand con-
figurable input multiplexers withupto8 channels.The serial
I/Ois configuredto comply withthe NSC MICROWIRETM
serial data exchange standardfor easy interfacetothe
COPSTM familyof controllers,andcan easily interfacewith
standard shift registersor microprocessors.
Designedfor high-speed/low-power applications,the devic-are capableofafast2ms conversion when usedwitha MHz clock.
All three devicesprovidea 2.5V band-gap derived reference
with guaranteed performance over temperature. track/hold function allowsthe analog voltageatthe posi-
tive inputto vary duringthe actual A/D conversion.
The analog inputscanbe configuredto operatein various
combinationsof single-ended, differential,or pseudo-differ-
ential modes.In addition, input voltagespansas smallas1V
canbe accommodated.
Applications High-speed data acquisition Digitizing automotive sensors Process control/monitoring Remote sensingin noisy environments Disk drives Portable instrumentation Test systems
Features Serial digital datalink requiresfewI/O pins Analog input track/hold function4-or 8-channel input multiplexer options with address
logic On-chip 2.5V band-gap reference (g2% over tempera-
ture guaranteed)No zeroorfull scale adjustment required TTL/CMOS input/output compatible0Vto5V analog input range with single5V power
supplyPin compatible with Industry-Standards ADC0831/4/8
Key Specifications Resolution 8Bits Conversion time(fCe4 MHz) 2ms (Max) Power dissipation 20 mW (Max) Single supply 5 VDC (g5%) Total unadjusted error g(/2 LSBandg1 LSB Linearity Error (VREFe 2.5V) g(/2 LSBNo missing codes (over temperature) On-board Reference a2.5V g1.5% (Max)
ADC08238 Simplified Block Diagram
TL/H/11015–4
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
COPSTM microcontrollersandMICROWIRETM aretrademarksofNational SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M75/PrintedinU.S.A.
