REV. B
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a
Dual 12-Bit (8-Bit Byte)
Double-Buffered CMOS D/A Converter
DAC8248
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
FEATURES
Two Matched 12-Bit DACs on One Chip
12-Bit Resolution with an 8-Bit Data Bus
Direct Interface with 8-Bit Microprocessors
Double-Buffered Digital Inputs
RESET to Zero Pin
12-Bit Endpoint Linearity (61/2 LSB) Over Temperature
15 V to 115 V Single Supply Operation
Latch-Up Resistant
Improved ESD Resistance
Packaged in a Narrow 0.3" 24-Pin DIP and 0.3" 24-Pin
SOL Package
Available in Die Form
APPLICATIONS
Multichannel Microprocessor-Controlled Systems
Robotics/Process Control/Automation
Automatic Test Equipment
Programmable Attenuator, Power Supplies, Window
Comparators
Instrumentation Equipment
Battery Operated Equipment
GENERAL DESCRIPTION
The DAC8248 is a dual 12-bit, double-buffered, CMOS digital-
to-analog converter. It has an 8-bit wide input data port that inter-
faces directly with 8-bit microprocessors. It loads a 12-bit word in
two bytes using a single control; it can accept either a least signifi-
cant byte or most significant byte first. For designs with a 12-bit or
16-bit wide data path, choose the DAC8222 or DAC8221.
The DAC8248’s double-buffered digital inputs allow both
DAC’s analog output to be updated simultaneously. This is par-
ticularly useful in multiple DAC systems where a common
LDAC signal updates all DACs at the same time. A single
RESET pin resets both outputs to zero.
The DAC8248’s monolithic construction offers excellent DAC-
to-DAC matching and tracking over the full operating tempera-
ture range. The DAC consists of two thin-film R-2R resistor
ladder networks, two 12-bit, two 8-bit, and two 4-bit data regis-
ters, and control logic circuitry. Separate reference input and
feedback resistors are provided for each DAC. The DAC8248
(continued on page 4)
FUNCTIONAL BLOCK DIAGRAM
PIN CONNECTIONS
24-Pin 0.3" Cerdip (W Suffix),
24-Pin Epoxy DIP (P Suffix),
24-Pin SOL (S Suffix)
