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ADC0820CIWM
8-Bit High Speed P Compatible A/D Converter with Track/Hold Function
ADC0820
8-Bit High Speed μP Compatible A/D Converter with
Track/Hold Function
General Description usinga half-flash conversion technique, the 8-bit
ADC0820 CMOSA/D offersa1.5μs conversion timeand
dissipates only75 mWof power. The half-flash technique
consistsof32 comparators,a most significant 4-bit ADCand least significant 4-bit ADC.
The inputtothe ADC0820is trackedand heldbythe input
sampling circuitry eliminatingthe needforan external
sample-and-holdfor signals movingatless than100 mV/μs.
For easeof interfaceto microprocessors, theADC0820has
been designedto appearasa memory locationorI/O port
withoutthe needfor external interfacing logic.
Key Specifications Resolution 8Bits Conversion Time 2.5μs Max (RD Mode)
1.5μs Max (WR-RD Mode) Low Power 75mW Max Total Unadjusted
Error ±1⁄2 LSBand±1 LSB
Features Built-in track-and-hold functionNo missing codesNo external clocking Single supply—5 VDC Easy interfacetoall microprocessors,or operates
stand-alone Latched TRI-STATE® output Logic inputsand outputs meet both MOSandT2L
voltage level specifications Operates ratiometricallyor withany reference value
equaltoor less than VCC0Vto5V analog input voltage range with single5V
supplyNo zeroor full-scale adjust required Overflow output availablefor cascading 0.3" standard width 20-pinDIP 20-pin molded chip carrier package 20-pin small outline package 20-pin shrink small outline package (SSOP)
Connection and Functional DiagramsTRI-STATE®isa registeredtrademark ofNationalSemiconductorCorporation.
Dual-In-Line, Small Outline
and SSOP PackagesDS005501-1
Top View
Molded Chip Carrier
PackageDS005501-33
June 1999
ADC0820
8-Bit
High
Speed
Compatible
A/D
Converter
with
rack/Hold
Function©1999 National Semiconductor Corporation DS005501
