DAC0854 Quad 8-Bit Voltage-Output Serial D A Converter with Readback
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鈥檚
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 MICROWIRE
TM
-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 V
BIAS
V
REF
and the
input word
Features
Y
Y
Y
Y
Y
Y
Y
Y
Single
a
5V supply operation
MICROWIRE serial interface allows easy interface to
many popular microcontrollers including the COPS
TM
and HPC
TM
families of microcontrollers
Data readback capability
Output data can be formatted to read back MSB or
LSB first
Versatile logic allows selective or global update of the
DACs
Power fail flag
Output amplifiers can drive 2 kX load
Synchronous asynchronous update of the DAC outputs
Key Specifications
Y
Y
Y
Y
Y
Y
Y
Y
Guaranteed monotonic over temperature
g
Integral linearity error
LSB max
Output settling time
2 7
ms
max
Analog output voltage range
0 3V to 2 8V
Supply voltage range
4 5V to 5 5V
Clock frequency
10 MHz max
Power dissipation (f
CLK
e
10 MHz)
95 mW max
On-board reference
2 65V
g
2% max
Applications
Y
Y
Y
Y
Automatic test equipment
Industrial process controls
Automotive controls and diagnostics
Instrumentation
Connection Diagram
Ordering Information
Industrial (
b
40 C
k
T
A
a
85 C)
DAC0854BIN DAC0854CIN
DAC0854CIJ
DAC0854BIWM DAC0854CIWM
Military (
b
55 C
k
T
A
k
a
125 C)
DAC0854CMJ 883
J20A Ceramic DIP
Package
N20A Molded DIP
J20A Ceramic DIP
M20B Small Outline
TL H 11261 鈥?1
Top View
COPS
TM
HPC
TM
and MICROWIRE
TM
are trademarks of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL H 11261
RRD-B30M75 Printed in U S A
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