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DAC1231LCJ-1 Datasheet

  • DAC1231LCJ-1

  • 12-Bit, uP Compatible, Double-Buffered D to A Converters

  • 18頁

  • NSC

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MICRO-DAC DAC1208 DAC1209 DAC1210 DAC1230 DAC1231 DAC1232
12-Bit
mP
Compatible Double-Buffered D to A Converters
February 1995
MICRO-DAC
TM
DAC1208 DAC1209 DAC1210 DAC1230
DAC1231 DAC1232 12-Bit
mP
Compatible
Double-Buffered D to A Converters
General Description
The DAC1208 and the DAC1230 series are 12-bit multiply-
ing D to A converters designed to interface directly with a
wide variety of microprocessors (8080 8048 8085 Z-80
etc ) Double buffering input registers and associated con-
trol lines allow these DACs to appear as a two-byte 鈥樷€榮tack鈥欌€?/div>
in the system鈥檚 memory or I O space with no additional in-
terfacing logic required
The DAC1208 series provides all 12 input lines to allow sin-
gle buffering for maximum throughput when used with 16-bit
processors These input lines can also be externally config-
ured to permit an 8-bit data interface The DAC1230 series
can be used with an 8-bit data bus directly as it internally
formulates the 12-bit DAC data from its 8 input lines All of
these DACs accept left-justified data from the processor
The analog section is a precision silicon-chromium (Si-Cr)
R-2R ladder network and twelve CMOS current switches
An inverted R-2R ladder structure is used with the binary
weighted currents switched between the I
OUT1
and I
OUT2
maintaining a constant current in each ladder leg indepen-
dent of the switch state Special circuitry provides TTL logic
input voltage level compatibility
The DAC1208 series and DAC1230 series are the 12-bit
members of a family of microprocessor compatible DACs
(MICRO-DACs
TM
) For applications requiring other resolu-
tions the DAC1000 series for 10-bit and DAC0830 series
for 8-bit are available alternatives
Features
Y
Y
Y
Y
Y
Y
Y
Y
Linearity specified with zero and full-scale adjust only
Direct interface to all popular microprocessors
Double-buffered single-buffered or flow through digital
data inputs
Logic inputs which meet TTL voltage level specs (1 4V
logic threshold)
Works with
g
10V reference full 4-quadrant
multiplication
Operates stand-alone (without
mP)
if desired
All parts guaranteed 12-bit monotonic
DAC1230 series is pin compatible with the DAC0830
series 8-bit MICRO-DACs
Key Specifications
Y
Y
Y
Y
Y
Y
Current Settling Time
Resolution
Linearity (Guaranteed
over temperature)
Gain Tempco
Low Power Dissipation
Single Power Supply
1
ms
12 Bits
10 11 or 12 Bits of FS
1 3 ppm C
20 mW
5 V
DC
to 15 V
DC
Typical Application
TL H 5690 鈥?1
TRI-STATE is a registered trademark of National Semiconductor Corp
MICRO-DAC
TM
is a trademark of National Semiconductor Corp
C
1995 National Semiconductor Corporation
TL H 5690
RRD-B30M115 Printed in U S A

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