DAC1232LIN datasheet(2/20 Pages) TI1

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TLH5690

February 1995

MICRO-DAC

TM DAC1208DAC1209DAC1210DAC1230

DAC1231DAC1232 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 ‘‘stack’’

in the system’s memory or IO 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 IOUT1 and IOUT2

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-DACsTM) For applications requiring other resolu-

tions the DAC1000 series for 10-bit and DAC0830 series

for 8-bit are available alternatives

Features

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 (14V

logic threshold)

Works with g10V referencefull 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

Current Settling Time

1 ms

Resolution

12 Bits

Linearity (Guaranteed

over temperature)

10 11 or 12 Bits of FS

Gain Tempco

13 ppm C

Low Power Dissipation

20 mW

Single Power Supply

5 VDC to 15 VDC

Typical Application

TLH5690 – 1

TRI-STATE

is a registered trademark of National Semiconductor Corp

MICRO-DACTM is a trademark of National Semiconductor Corp

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A

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