DAC12QZ_15 Datasheet, PDF (1/2 Pages) Analog Devices – Low Cost General Purpose Digitalto Analog Converter

ANALOG
W DEVICES
Low CostGeneraPl urpose
Digitalto AnalogConverter
FEATURES
Low Cost
12 Bit Resolution
%LSBLinearity
:t30ppmfC TC
20ppm/% Power Supply Rejection
- ^{Programmable Output Ranges}
Small Size 2" x 2" x 0.4"
OBSOLETE _{GENERAL DESCRIPTION}
OUTPUT PROGRAMMING
The DAC-12QZ is a low-cost/high performance 12-bit digital- , The scale factor is programmed by connecting external jumpers
to-analog converter designed for general purpose OEM applica- ^{between module pins. With either model, the user can select}
tions. The completely self-contained module includes weighted
resistor networks, monolithic /lDAC current switches, tempera-
anyone of five output ranges, including bipolar outputs. The
choices are:
ture compensated reference and an externally programmable
Unipolar 0 to +5V, 0 to +lOV
output amplifier. Performance specifications include lhLSB
linearity error, 5/ls settling time for full scale conversion,
30ppm/ C temperature coefficient and 20ppm/% power sup-
Bipolar :t2.5V, :t5V, :tlOV
The externai jumpers at the module pins determine the output
ply rejection.
amplifier feedback resistance, allowing use of one 5k resistor,
or both, either in series to provide lOk, or parallel to provide
/lDAC DESIGN
2.5k. Offset of exactly one-half full scale for bipolar applica-
This outstanding cost/performance ratio has been achieved by
utilizing the popular AD550 /lDAC current switches. The use
of monolithic quad current switches offers close inherent
matching of switch characteristics and excellent temperature
tracking as well as reasonably fast conversion speed. A hybrid
resistor assembly of matched precision resistors and a thick
tions is provided by connecting another jumper to the sum-
ming junction of the output amplifier. To maintain constant
load on the reference zener, the bipolar offset output should
be grounded when using the module in a unipolar mode.
BLOCK DIAGRAM
DAC-12QZ
film network is used in conjunction with the /lDAC switches.
Resistors provided include not only the weighting resistors but
also the inter-quad attenuators, amplifier feedback resistors,
etc. to assure close temperature tracking.
INPUT CODING
28 ZERO ADJ
Z7 SUM JeT
20 OUT
ZS REF
Z410V
23 20V
2Z GAIN ADJ
The internal /lDAC switches of the binary and BCD models are
driven directly by complementary input codes without need of
a strobe. The complementary codes for each model are:
MODEL
-F.S.
Zero
+F.S.
DAC-12QUBIN
111111111111 000000000000
111111111111 011111111111"000000000000
81T 20
81T39
BIT 410
BIT' n
BIT 0 12
BIT 713
BIT 014
21 B'POLAR
0 2ONe
0 1 19 N e
1B BIT 12
17 BIT n
10 BIT 10
15 BIT 9
DAC-12QZ!BCD
111111111111 011001100110
111111111111 10tO 11111111 011001100110
NOH PINS SHOWN AS HAVING NO CONNECTIONS INe I
ARE DELETED.
DIA CONVERTERS
375