1
Memory
All data sheets are subject to change without notice
(858) 503-3300- Fax: (858) 503-3301- www.maxwell.com
Quad 8-Bit Multiplying CMOS
8408
©2002 Maxwell Technologies
All rights reserved.
D/A Converter with Memory
08.20.02 REV 1
FEATURES:
•RAD-PAK® patented shielding against natural
• space radiation
• Total dose hardness:
- equal to 100 krad (Si), depending upon orbit
and space mission
• Package:
- 28 pin R
AD-PAK® Flat Pack
• Single Supply Ooperation (+5V)
• Four 8 Bit DACs in one 28 Pin Package
• D/As Matched to within 1%
• TTL/CMOS Compatable
• Four-Quadrant Multiplication
DESCRIPTION:
Maxwell Technologies’ 8408 is a monolithic quad 8-bit multi-
plying digital-to-analog CMOS converter. Each DAC has its
own reference input, feedback resistor, and onboard data
latches that feature read/write capability. The readback func-
tion serves as memory for those systems requiring self-diag-
nostics.
A common 8-bit TTL/CMOS compatible input port is used to
load data into any of the four DAC data-latches. Control lines
DS1
, DS2 and A/B determine which DAC will accept data.
Data loading is similar to that of a RAMs write cycle. Data can
be read back onto the same bus with control line R/W
. The
8408 is a bus compatible with most 8-bit microprocessors,
including the 6800, 8080, 8085, and Z80. The 8408 operates
on a single +5 volt supply and dissipates less than 20 mW.
The 8408 is manufactured using highly stable, thin-film resis-
tors on an advanced oxide-isolated, silicon-gate, CMOS pro-
cess. The improved latch-up resistant design eliminates the
need for external protective Schottky diodes.
Maxwell Technologies' patented R
AD-PAK® packaging technol-
ogy incorporates radiation shielding in the microcircuit pack-
age. It eliminates the need for box shielding while providing
the required radiation shielding for a lifetime in orbit or space
mission. In a GEO orbit, R
AD-PAK provides greater than 100
krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.
Logic Diagram
