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DAC1020 Scheda tecnica(PDF) 11 Page - Texas Instruments

Il numero della parte DAC1020
Spiegazioni elettronici  10-Bit Binary Multiplying D/A Converter
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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Definition of Terms
Resolution
Resolution is defined as the reciprocal of the
number of discrete steps in the DA output It is directly
related to the number of switches or bits within the DA For
example the DAC1020 has 210 or 1024 steps while the
DAC1220 has 212 or 4096 steps Therefore the DAC1020
has 10-bit resolution while the DAC1220 has 12-bit resolu-
tion
Linearity Error
Linearity error is the maximum deviation
from
a straight line passing through the endpoints of the
DA transfer characteristic It is measured after calibrating
for zero (see VOS adjust in typical applications) and full-
scale Linearity error is a design parameter intrinsic to the
device and cannot be externally adjusted
Power Supply Sensitivity
Power supply sensitivity is a
measure of the effect of power supply changes on the DA
full-scale output
Settling Time
Full-scale settling time requires a zero to full-
scale or full-scale to zero output change Settling time is the
time required from a code transition until the DA output
reaches within g
LSB of final output value
Full-Scale Error
Full-scale error is a measure of the output
error between an ideal DA and the actual device output
Ideally for the DAC1020 full-scale is VREFb1 LSB For
VREFe10V
and
unipolar
operation
VFULL-SCA-
LE
e
100000V98 mVe99902V Full-scale error is ad-
justable to zero as shown in
Figure 5
TLH5689 – 10
ab1
b2
(a) End point test after zero and full-scale adjust
The DAC has 1 LSB linearity error
(b) By shifting the full-scale calibration on of the DAC of
Figure (b1) we could pass the ‘‘best straight line’’ (b2)
test and meet the g
linearity error specification
Note (a) (b1) and (b2) above illustrate the difference between ‘‘end point’’ National’s linearity test (a) and ‘‘best straight line’’ test Note that both devices in (a) and
(b2) meet the g
LSB linearity error specification but the end point test is a more ‘‘real life’’ way of characterizing the DAC
Connection Diagrams
DAC102X
Dual-In-Line Package
TLH5689 – 13
DAC1020
PLCC Package
TLH5689 – 12
DAC122X
Dual-In-Line Package
TLH5689 – 11
http
www nationalcom
10


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