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PDF ( 数据手册 , 数据表 ) DAC0854CIWM

零件编号 DAC0854CIWM
描述 8-Bit Voltage-Output
制造商 National Semiconductor
LOGO National Semiconductor LOGO 


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DAC0854CIWM 数据手册, 描述, 功能
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







DAC0854CIWM pdf, 数据表
Block Diagram
Pin Description
VOUT1(19)
VOUT2(1)
VOUT3(14)
VOUT4(11)
VREFOUT(16)
VBIAS1(2)
VBIAS2(13)
GND(7)
DVCC(10)
AVCC(17)
The voltage output connections of the
four DACS These provide output
voltages in the range 0 3V–2 8V
The internal voltage reference output
The output of the reference is 2 65V
g2% This pin should be bypassed with
a 220 mF capacitor
VBIAS1 is connected to the non-inverting
inputs of output amplifiers 1 and 2
thereby setting the virtual ground
voltage for DAC’s 1 and 2 while VBIAS2
performs this function for DAC’s 3 and 4
The allowed range is 0 3V –1 4V
The system ground pin Connect to
clean ground point
The digital and analog power supply
pins The power supply range of the
DAC0854 is 4 5V – 5 5V To guarantee
accuracy it is required that the AVCC
and DVCC pins be bypassed separately
with bypass capacitors of 10 mF
tantalum in parallel with 0 1 mF ceramic
TL H 11261 – 15
AU(4)
VREF1(18)
VREF2(20)
VREF3(15)
VREF4(12)
CS(3)
CLK(5)
DI(9)
DO(6)
INT(8)
When this pin is taken low all DAC outputs
will be asynchronously updated CS must be
held high during the update
The voltage reference inputs for the four
DACs The allowed range is 0V – 2 75V
The Chip Select control input This input is
active low
The external clock input pin
The serial data input The data is clocked in
LSB first Preceding the data byte are 4 or 6
bits of instructions
The serial data output The data can be
clocked out either MSB or LSB first and on
either the positive or negative edge of the
clock
The power interrupt output On an
interruption of the power supply this pin
goes low Since this pin has an open drain
output a 10 kX pull-up resistor must be
connected to the supply
8














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