DAC1209LCJ NSC [National Semiconductor], DAC1209LCJ Datasheet

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DAC1209LCJ

Manufacturer Part Number
DAC1209LCJ
Description
12-Bit, uP Compatible, Double-Buffered D to A Converters
Manufacturer
NSC [National Semiconductor]
Datasheet

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C 1995 National Semiconductor Corporation
MICRO-DAC
DAC1231 DAC1232 12-Bit
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 ‘‘stack’’
in the system’s 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
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
tions the DAC1000 series for 10-bit and DAC0830 series
for 8-bit are available alternatives
Typical Application
TRI-STATE is a registered trademark of National Semiconductor Corp
MICRO-DAC
TM
is a trademark of National Semiconductor Corp
TM
) For applications requiring other resolu-
TM
TL H 5690
DAC1208 DAC1209 DAC1210 DAC1230
OUT1
and I
OUT2
P Compatible
Features
Y
Y
Y
Y
Y
Y
Y
Y
Key Specifications
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
multiplication
Operates stand-alone (without P) if desired
All parts guaranteed 12-bit monotonic
DAC1230 series is pin compatible with the DAC0830
series 8-bit MICRO-DACs
Current Settling Time
Resolution
Linearity (Guaranteed
over temperature)
Gain Tempco
Low Power Dissipation
Single Power Supply
g
10V reference full 4-quadrant
10 11 or 12 Bits of FS
RRD-B30M115 Printed in U S A
5 V
TL H 5690 – 1
February 1995
DC
1 3 ppm C
to 15 V
20 mW
12 Bits
1 s
DC

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DAC1209LCJ Summary of contents

Page 1

MICRO-DAC TM DAC1208 DAC1209 DAC1210 DAC1230 DAC1231 DAC1232 12-Bit Double-Buffered Converters General Description The DAC1208 and the DAC1230 series are 12-bit multiply- ing converters designed to interface directly with a wide variety of microprocessors ...

Page 2

... All Data Inputs Latched OUT2 High Digital Input Threshold Low Threshold High Threshold Digital Input Currents Digital Inputs Digital Inputs Operating Conditions Lead Temperature (Soldering 10 sec ) Temperature Range DAC1208LCJ DAC1209LCJ DAC1210LCJ DAC1230LCJ 17 V DAC1231LCJ DAC1232LCJ DC DAC1231LIN DAC1232LIN V to GND CC DAC1208LCJ-1 DAC1210LCJ-1 25V g ...

Page 3

Electrical Characteristics V 10 000 REF Note 13) all other limits Symbol Parameter AC CHARACTERISTICS t Current Setting ...

Page 4

Switching Waveforms Typical Performance Characteristics Digital Input Threshold Gain and Linearity Error Variation vs Supply Voltage Write Pulse Width t Digital Input Threshold vs Temperature Control Set-Up Time t CS Data Set-Up Time ...

Page 5

Definition of Package Pinouts CONTROL SIGNALS (all control signals are level actuated) CS Chip Select (active low) The CS will enable WR1 WR1 Write 1 The active low WR1 is used to load the digital data bits (DI) into the ...

Page 6

Application Hints 1 0 DIGITAL INTERFACE These DACs are designed to provide all of the necessary digital input circuitry to permit a direct interface to a wide variety of microprocessor systems The timing and logic lev- el convention of the ...

Page 7

Application Hints (Continued Automatic Transfer The 12-bit DAC word is automatically transferred to the DAC register and the R-2R ladder when the second write (the 4 LSBs of the data) occurs 1 2 Independent Processor Transfer Control In ...

Page 8

Application Hints (Continued Left-Justified Data Format It is important to realize that the input registers of these DACs are arranged to accept a left-justified data word from the microprocessor with the most significant 8 bits coming first (Byte ...

Page 9

Application Hints (Continued) cations where the DAC is used in a continuous feedback control loop and is driven by a binary up down counter or in function generation circuits where a ROM is continuously providing DAC data Only the DAC1208 ...

Page 10

Application Hints (Continued) width If this does not provide a sufficient data hold time at the end of the write cycle a negative edge triggered one- shot can be included between the system write strobe and the WR pin of ...

Page 11

Application Hints (Continued) FIGURE 8 TRI-STATE Buffers Isolate the Data and Control Lines from the DACs A Transfer Word Provides a Flexible Update 5690-14 ...

Page 12

Application Hints (Continued ANALOG APPLICATIONS The analog output signal for these DACs is derived from a conventional R-2R current switching ladder network A de- tailed description of this network can be found on the DAC1000 series data sheet ...

Page 13

Application Hints (Continued) Transient response and settling time of the op amp are im- portant in fast data throughput applications The largest sta- bility problem is the feedback pole created by the feedback resistance R and the output capacitance of ...

Page 14

Application Hints (Continued Zero and Full-Scale Adjustments To calibrate the bipolar output circuit three adjustments are required The first step is to set all of the digital inputs LOW (to force then null the ...

Page 15

Application Hints (Continued) 1 Amp( 4096 High Current Controller 8-Bit Course 4-Bit Vernier DAC 5690 – 5690 – 20 ...

Page 16

... Ordering Information Part Number Non-Linearity DAC1208LCJ 0 018% DAC1208LCJ-1 0 018% DAC1209LCJ 0 024% DAC1210LCJ 0 050% DAC1210LCJ-1 0 050% DAC1230LCJ 0 018% DAC1230LCJ-1 0 018% DAC1231LCJ 0 024% DAC1231LCJ-1 0 024% DAC1231LCN 0 024% DAC1231LCWM 0 024% DAC1231LIN 0 024% DAC1232LCJ 0 050% DAC1232LCJ-1 0 050% DAC1232LCN 0 050% DAC1232LCWM 0 050% DAC1232LIN 0 050% Temperature Package ...

Page 17

... Physical Dimensions inches (millimeters) 20-Lead Ceramic Dual-In-Line Package (J) Order Number DAC1230LCJ DAC1230LCJ-1 DAC1231LCJ DAC1231LCJ-1 DAC1232LCJ or DAC1232LCJ-1 24-Lead Ceramic Dual-In-Line Package (J) Order Number DAC1208LCJ DAC1208LCJ-1 DAC1209LCJ DAC1210LCJ or DAC1210LCJ-1 NS Package Number J20A NS Package Number J24A 17 ...

Page 18

Physical Dimensions inches (millimeters) (Continued) 20-Lead Molded Small Outline Package (M) Order Number DAC1231LCWM or DAC1232LCWM 20-Lead Molded Dual-In-Line Package (N) Order Number DAC1231LCN DAC1231LIN DAC1232LCN or DAC1232LIN LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL ...

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