dac1054 National Semiconductor Corporation, dac1054 Datasheet

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dac1054

Manufacturer Part Number
dac1054
Description
Quad 10-bit Voltage-output Serial D/a Converter With Readback
Manufacturer
National Semiconductor Corporation
Datasheet

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dac1054CIWM
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C 1995 National Semiconductor Corporation
DAC1054 Quad 10-Bit Voltage-Output
Serial D A Converter with Readback
General Description
The DAC1054 is a complete quad 10-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 serial microprocessor interface By combining
in one package the reference amplifiers and conversion
circuitry for four D A converters the DAC1054 minimizes
wiring and parts count and is hence ideally suited for appli-
cations where cost and board space are of prime concern
The DAC1054 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 DAC1054’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 MICROWIRE
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 Each DAC
register may be written to individually Double buffering al-
lows all 4 DAC outputs to be updated simultaneously or
individually
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
input word
Connection Diagram
COPS
TM
HPC
TM
and MICROWIRE
TM
Top View
are trademarks of National Semiconductor Corporation
TL H 11437
TM
-compatible serial in-
BIAS
V
REF
TL H 11437 – 1
and the
Features
Y
Y
Y
Y
Y
Y
Y
Y
Key Specifications
Y
Y
Y
Y
Y
Y
Y
Y
Y
Applications
Y
Y
Y
Y
Ordering Information
Industrial (
DAC1054CIN
DAC1054CIWM
Military (
DAC1054CMJ 883 or
Single
MICROWIRE serial interface allows easy interface to
many popular microcontrollers including the COPS
and HPC
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
Guaranteed monotonic over temperature
Integral linearity error
Output settling time
Analog output voltage range
Supply voltage range
Clock frequency for write
Clock frequency for read back
Power dissipation (f
On-board reference
Automatic test equipment
Industrial process controls
Automotive controls and diagnostics
Instrumentation
5962-9466201MJA
a
b
TM
5V supply operation
55 C
b
40 C
families of microcontrollers
k
k
T
A k
CLK
T
A k
a
e
a
125 C)
10 MHz)
85 C)
N24A Molded DIP
M24B Small Outline
J24A Ceramic DIP
RRD-B30M75 Printed in U S A
2 65V
Package
g
January 1995
100 mW max
10 MHz max
0 3V to 2 8V
4 5V to 5 5V
3 7 ms max
5 MHz max
g
LSB max
2% max
TM

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dac1054 Summary of contents

Page 1

... The DAC1054 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 DAC1054’s ...

Page 2

... Operating Ratings 5 mA Supply Voltage 30 mA Supply Voltage Difference (AV 950 mW Temperature Range DAC1054CIN DAC1054CIWM 2000V DAC1054CMJ 883 200V 65V REF BIAS e 10 MHz unless otherwise specified Boldface limits apply for T CLK ...

Page 3

Converter Electrical Characteristics The following specifications apply for AV CC the analog outputs – pins and 23) and f e All other limits apply for T T from MIN MAX Symbol Parameter DIGITAL ...

Page 4

... J Note 9 Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level) Note 10 A monotonicity of 10 bits for the DAC1054 means that the output voltage changes in the same direction (or remains constant) for each increase in the input code Note 11 Integral linearity error is the maximum deviation of the output from the line drawn between zero and full-scale (excluding the effects of zero error and full- ...

Page 5

Typical Converter Performance Characteristics Zero Error vs Temperature Zero Error PSRR vs Temperature Typical Reference Performance Characteristics Bandgap Voltage vs Temperature Full-Scale Error vs Temperature Full-Scale Error PSRR vs Temperature Integral Non-Linearity Error vs Temperature Line Regulation vs Temperature TL ...

Page 6

TRI-STATE Test Circuits and Waveforms Timing Waveforms Data Input Timing Timing Diagrams FIGURE 1 Write to One DAC with Update of Output ( 11437 – 11437 – 7 Data Output Timing TL H 11437 – ...

Page 7

Timing Diagrams (Continued) DACs are written to MSB first DAC1 is written to first then DACs 2 3 and 4 FIGURE 2 Write to All DACs with Update of Outputs (AU FIGURE 3 Read One DAC DO LSB First DO ...

Page 8

... The digital and analog power supply CC AV (19) pins The power supply range of the CC DAC1054 – guarantee accuracy it is required that the AV and DV pins be bypassed separately CC with bypass capacitors tantalum in parallel with ceramic AU(11) When this pin is taken low all DAC outputs ...

Page 9

... DAC register a shift register a current output DAC and an output amplifier In addition the DAC1054 has an onboard bandgap reference and a logic unit which controls the inter- nal operation of the DAC1054 and interfaces it to micro- processors Each of the four internal 10-bit DACs uses a modified R-2R ...

Page 10

... Digital Interface The DAC1054 has two interface modes a WRITE mode and a READ mode The WRITE mode is used to convert a 10-bit digital input word into a voltage The READ mode is used to read back the digital data that was sent to one or all of the DACs The WRITE mode maximum clock rate is ...

Page 11

... Power Fail Function The DAC1054 powers up with the INT pin in a Low state To force this output high and reset this flag the CS pin will have to be brought low When this is done the INT output will be pulled high again via an external 10 kX pull-up resistor Any- ...

Page 12

Typical Applications FIGURE 7 Trimming the Offset Amp Whose Output is Biased FIGURE 8 Trimming the Offset of a Dual Supply Op Amp (V FIGURE 9 Bringing the Output Range Down to Ground ...

Page 13

... Physical Dimensions inches (millimeters) Order Number DAC1054CMJ 883 or 5962-9466201MJA NS Package Number J24A Order Number DAC1054CIWM NS Package Number M24B 13 ...

Page 14

... Fax (81-41) 35-1 National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications Order Number DAC1054CIN NS Package Number N24A 2 A critical component is any component of a life ...

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