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DAC0854CIJ bảng dữ liệu(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DAC0854CIJ
Giải thích chi tiết về linh kiện  8-Bit Voltage-Output
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DAC0854CIJ bảng dữ liệu(HTML) 9 Page - National Semiconductor (TI)

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Applications Information
FUNCTIONAL DESCRIPTION
The DAC0854 is a monolithic quad 8-bit digital-to-analog
converter that is designed to operate on a single 5V supply
Each of the four units is comprised of an input register a
DAC register a shift register a current output DAC and an
output amplifier In addition the DAC0854 has an onboard
bandgap reference and a logic unit which controls the inter-
nal operation of the DAC0854 and interfaces it to micro-
processors
Each of the four internal 8-bit DACs uses a modified R-2R
ladder to effect the digital-to-analog conversion
(Figure 5)
The resistances corresponding to the 2 most significant bits
are segmented to reduce glitch energy and to improve
matching The bottom of the ladder has been modified so
that the voltage across the LSB resistor is much larger than
the input offset voltage of the buffer amplifier The input
digital code determines the state of the switches in the lad-
der network The sum of currents IOUT1 and IOUT2 is fixed
and is given by
IOUT1 a IOUT2 e
VREFbVBIAS
R
J 255
256
The current output IOUT2 is applied to the internal output
amplifier and converted to a voltage The output voltage of
each DAC is a function of VBIAS VREF and the digital input
word and is given by
VOUT e 2(VREFbVBIAS)
DATA
256
a
511
128
VBIASb
255
128
VREF
The output voltage range for each DAC is 03V – 28V This
range can be achieved by using the internal 265V reference
and a voltage divider network which provides a VBIAS of
140V
(Figure 6) In this case the DAC transfer function is
VOUT e 25
(DATA)
256
a
0310
The output impedance of any external reference that is
used will affect the accuracy of the conversion In order that
this error be less than
LSB the output impedance of the
external reference must be less than 78X
TLH11261 – 16
FIGURE 5 Equivalent Circuit of R-2R Ladder and Output Amplifier
TLH11261 – 17
FIGURE 6 Generating a VBIAS e 140V from the Internal Reference
9


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