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DAC0890CIJ bảng dữ liệu(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DAC0890CIJ
Giải thích chi tiết về linh kiện  Dual 8-bit mP-Compatible Digital-to-Analog Converter
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DAC0890CIJ bảng dữ liệu(HTML) 9 Page - National Semiconductor (TI)

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Applications Information
Full-Scale Output Voltage Range Selection
The DAC0890 has been designed for ease of use All refer-
ence voltage and output amplifier connections are internal
All trims such as full-scale (gain) and zero (offset) are per-
formed during manufacturing Therefore no external trim-
ming is required to achieve the specified accuracy The only
external connections required select the desired full-scale
output voltage range
The two full-scale output voltage ranges are selected by
connecting SENSE SELECT and VOUT as shown in
Figure
2a b The 255V range can be used with supply voltages as
low as 475V The 102V range can be selected with sup-
plies as low as 120V
TLH10592 – 8
FIGURE 2a 0V to 255V Output Voltage Range
TLH10592 – 9
FIGURE 2b 0V to 102V Output Voltage Range
Power Supply Voltage
The DAC0890 is designed to operate on a single power
supply voltages a475V and a165V For 255V full-scale
operation the power supply voltage can be as low as
a
475V When the 102V full-scale is used the supply volt-
age needs to be between a12V to a165V
Grounding and Power Supply
Bypassing
Proper grounding is essential to extract all the precision and
full rated performance that the DAC0890 is capable of deliv-
ering Typical applications for the DAC0890 include opera-
tion with a microprocessor In this environment digital noise
is prevalent and anticipated Therefore special care must
be taken to ensure that proper operation will be achieved
The DAC0890 uses two ground pins AGND and DGND to
minimize ground drops and noise in the analog signal paths
Figure 3 details the proper bypassing and ground connec-
tions
The DAC0890’s best performance can be ensured by con-
necting 001 mFto0 1 mF ceramic capacitor in parallel with
an electrolytic of 22 mFto22 mF between the Va pin and
AGND
Sense Inputs
The SENSE inputs (pins 13 and 19) allow compensation for
voltage drops in long output lines to remote loads This
places the drops in the internal amplifier’s feedback loop
An example of this is shown in
Figure 3 The I-R drop which
might be caused by printed circuit board traces or long ca-
bles between the VOUT2 and the load impedance RL is
placed inside the feedback loop if SENSE1 is connected
directly to the load This forces the voltage at the load to be
the correct value It is important to remember that the volt-
age at the DAC0890’s VOUT pins may become higher than
the full-scale output voltage selected using the SELECT
pins Therefore the power supply voltage applied to Va
must be t22V above the resulting output voltage (at pins
14 and 18) when the SENSE inputs are used
The SENSE inputs have a finite input impedance The
range-setting resistors load the output with 25 kX when the
0V to 255V range is selected and 10 kX when the 0V to
102V range is selected
TLH10592 – 10
FIGURE 3 Typical Connection Showing Power Supply
Bypassing and the Use of SENSE Inputs
9


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