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ADC08161
500 ns A/D Converter with S/H Function, 2.5V Bandgap Reference and Input Multiplexer
TL/H/11149
ADC08161
A/D
Converter
with
S/H
Function
and
2.5V
Bandgap
Reference
November 1995
ADC08161
500 ns A/D Converter with S/H Function and
2.5V Bandgap Reference
General Description
Usinga patented multi-step A/D conversion technique,the
8-bit ADC08161 CMOS A/Dconverter offers500ns conver-
sion time, internal sample-and-hold (S/H),a 2.5V bandgap
reference, and dissipates only 100 mWof power. The
ADC08161 performsan 8-bit conversionwitha 2-bit voltage
estimatorthat generatesthe2 MSBsandtwo low-resolution
(3-bit) flashesthat generatethe6 LBSs.
Input signalsare trackedand heldbythe input sampling
circuitry, eliminatingthe needforan external sample-and-
hold. The ADC08161can perform accurate conversionsof
full-scale input signalsat frequencies fromDCto typically
more than300kHz(full power bandwidth) withoutthe needan external sample-and-hold (S/H).
For easeof interfaceto microprocessors,thisparthas been
designedto appearasa memory locationorI/Oport with-
outthe needfor external interfacing logic.
Key Specifications Resolution 8Bits Conversion time (tCONV) 560ns max (WR-RD Mode) Full power bandwidth 300kHz (typ) Throughput rate 1.5 MHzmin Power dissipation 100 mW max Total unadjusted error g(/2 LSBandg1 LSB max
FeaturesNo external clock required Analog input voltage range from GNDtoVa 2.5V bandgap reference
Applications Mobile telecommunications Hard-disk drives Instrumentation High-speed data acquisition systems
Block Diagram
TL/H/11149–1
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
C1996National SemiconductorCorporation RRD-B30M36/Printed inU.S.A. http://
