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ADC10464
10-Bit 600 ns A/D Converter with Input Multiplexer and Sample/Hold
TL/H/11108
ADC10461/ADC10462/ADC10464
10-Bit
A/D
Converter
with
Input
Multiplexer
and
Sample/Hold
December 1994
ADC10461/ADC10462/ADC10464 10-Bit 600 ns
A/D Converter with Input Multiplexer and Sample/Hold
General Description
Usingan innovative, patented multistep* conversion tech-
nique,the 10-bit ADC10461, ADC10462, and ADC10464
CMOS analog-to-digital converters offer sub-microsecond
conversion timesyet dissipatea maximumof only235 mW.
The ADC10461, ADC10462, and ADC10464 performa
10-bit conversionin two lower-resolution ‘‘flashes’’, thus
yieldingafast A/D withoutthe cost, power dissipation,and
other problems associated with true flash approaches.Dy-
namic performance (THD, S/N)is guaranteed. The
ADC10461is pin-compatible withthe ADC1061but much
faster, thus providinga convenient upgrade pathforthe
ADC1061.
The analog input voltagetothe ADC10461, ADC10462,and
ADC10464is sampledand heldbyan internal samplingcir-
cuit. Input signalsat frequencies fromdcto over 200kHz
canthereforebe digitizedaccurately withoutthe needforan
external sample-and-hold circuit.
The ADC10462 and ADC10464 includea ‘‘speed-up’’pin.
Connectingan externalresistorbetween thispinand ground
reducesthe typical conversion timetoas littleas 350ns
with onlya small increasein linearity error.
For easeof interfaceto microprocessors,the ADC10461,
ADC10462,and ADC10464 have been designedto appeara memory locationorI/O port withoutthe need forexter-
nal interface logic.
Features Built-in sample-and-hold Single a5V supply1,2,or 4-input multiplexer optionsNo external clock required Speed adjustpinfor faster conversions (ADC10462and
ADC10464)
Key Specifications Conversion timeto10bits 600ns typical,
900ns maxover temperature Sampling Rate 800 kHz Low power dissipation 235 mW (max) Total harmonic distortion(50 kHz) b60dB (max)No missing codes over temperature
Applications Digital signal processor front ends Instrumentation Disk drives Mobile telecommunications
Ordering Information
ADC10461
Industrial Package(b40§CsTAs a85§C)
ADC10461CIN N20A MoldedDIP
ADC10461CIWM M20B Small Outline
ADC10462
Industrial Package(b40§CsTAs a85§C)
ADC10462CIN N24A MoldedDIP
ADC10462CIWM M24B Small Outline
ADC10464
Industrial Package(b40§CsTAs a85§C)
ADC10464CIN N28BMoldedDIP
ADC10464CIWM M28B Small Outline
*U.S. Patent Number 4918449
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M75/PrintedinU.S.A.
