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National Semiconductor - 8-Bit Voltage-Output

Numéro de référence DAC0854BIWM
Description 8-Bit Voltage-Output
Fabricant National Semiconductor 
Logo National Semiconductor 





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DAC0854BIWM fiche technique
January 1995
DAC0854 Quad 8-Bit Voltage-Output
Serial D A Converter with Readback
General Description
The DAC0854 is a complete quad 8-bit voltage-output digi-
tal-to-analog converter that can operate on a single 5V sup-
ply It includes on-chip output amplifiers internal voltage ref-
erence and a serial microprocessor interface By combining
in one package the reference amplifiers and conversion
circuitry for four D A converters the DAC0854 minimizes
wiring and parts count and is hence ideally suited for appli-
cations where cost and board space are of prime concern
The DAC0854 also has a data readback function which can
be used by the microprocessor to verify that the desired
input word has been properly latched into the DAC0854’s
data registers The data readback function simplifies the de-
sign and reduces the cost of systems which need to verify
data integrity
The logic comprises a MICROWIRETM-compatible serial in-
terface and control circuitry The interface allows the user to
write to any one of the input registers or to all four at once
The latching registers are double-buffered consisting of 4
separate input registers and 4 DAC registers Double buffer-
ing allows all 4 DAC outputs to be updated simultaneously
The four reference inputs allow the user to configure the
system to have a separate output voltage range for each
DAC The output voltage of each DAC can range between
0 3V and 2 8V and is a function of VBIAS VREF and the
input word
Features
Y Single a5V supply operation
Y MICROWIRE serial interface allows easy interface to
many popular microcontrollers including the COPSTM
and HPCTM families of microcontrollers
Y Data readback capability
Y Output data can be formatted to read back MSB or
LSB first
Y Versatile logic allows selective or global update of the
DACs
Y Power fail flag
Y Output amplifiers can drive 2 kX load
Y Synchronous asynchronous update of the DAC outputs
Key Specifications
Y Guaranteed monotonic over temperature
Y Integral linearity error
g LSB max
Y Output settling time
2 7 ms max
Y Analog output voltage range
0 3V to 2 8V
Y Supply voltage range
4 5V to 5 5V
Y Clock frequency
10 MHz max
Y Power dissipation (fCLK e 10 MHz)
95 mW max
Y On-board reference
2 65V g2% max
Applications
Y Automatic test equipment
Y Industrial process controls
Y Automotive controls and diagnostics
Y Instrumentation
Connection Diagram
Ordering Information
Industrial (b40 C k TA a85 C)
Package
DAC0854BIN DAC0854CIN
N20A Molded DIP
DAC0854CIJ
J20A Ceramic DIP
DAC0854BIWM DAC0854CIWM M20B Small Outline
Military (b55 C k TA k a125 C)
DAC0854CMJ 883
J20A Ceramic DIP
Top View
TL H 11261 – 1
COPSTM HPCTM and MICROWIRETM are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL H 11261
RRD-B30M75 Printed in U S A

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