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DAC1219LCJ Folha de dados(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças DAC1219LCJ
Descrição Electrónicos  12-Bit Binary Multiplying D/A Converter
Download  12 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

DAC1219LCJ Folha de dados(HTML) 9 Page - National Semiconductor (TI)

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Application Hints (Continued)
31 Zero and Full-Scale Adjustments
The three adjustments needed for this circuit are shown in
Figure 7 The first step is to set all of the digital inputs LOW
(to force IOUT1 to 0) and then trim ‘‘zero adjust’’ for zero
volts at the inverting input (pin 2) of OA1 Next with a code
of all zeros still applied adjust ‘‘- full-scale adjust’’ the refer-
ence voltage for VOUT e g
l(ideal VREF)l The sign of the
output voltage will be opposite that of the applied reference
Finally set all of the digital inputs HIGH and adjust ‘‘a full-
scale adjust’’ for VOUTeVREF (511512) The sign of the
output at this time will be the same as that of the reference
voltage This a full-scale adjustment scheme takes into ac-
count the effects of the VOS of amplifier A2 (as long as this
offset is less than 01% of VREF) and any gain errors due to
external resistor mismatch
40 MISCELLANEOUS APPLICATION HINTS
The devices are CMOS products and reasonable care
should be exercised in handling them to prevent catastroph-
ic failures due to electrostatic discharge
During power-up supply voltage sequencing the negative
supply of the output amplifier may appear first This will typi-
cally cause the output of the op amp to bias near the nega-
tive supply potential No harm is done to the DAC however
as the on-chip 15 kX feedback resistor sufficiently limits the
current flow from IOUT1 when this lead is clamped to one
diode drop below ground
As a general rule any unused digital inputs should be tied
high or low as required by the application As a trouble-
shooting aid if any digital input is left floating the DAC will
interpret that input as a logical 1 level
Additional Application Ideas
For the circuits shown D represents the decimal equivalent of the binary digital input code D ranges from 0 (for an all zeros
input code) to 4095 (for an all ones input code) and for any code can be determined from
D e 2048(A1) a 1024(A2) a 512(A2) a
2(A11) a 1(A12)
where AN e 1 if that input is high
AN e 0 if that input is low
DAC Controlled Amplifier
TLH5691 – 10
9


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