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AD394TD 데이터시트(PDF) 10 Page - Analog Devices

부품명 AD394TD
상세설명  Up-Compatible Multiplying Quad 12-Bit D/A Converter
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AD394TD 데이터시트(HTML) 10 Page - Analog Devices

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AD394
Rev. A | Page 10 of 12
8-Bit Processors
The circuit of Figure 13 shows the general principles for
connecting the AD394 to an 8-bit data bus. The 74LS244 buffers
the data bus; its outputs are enabled when the DAC address
appears on the address bus. The first byte sent to the DAC is
loaded to the 74LS373 octal latch and, when the second byte is
sent to the DAC, it is combined with the first byte to create a
12-bit word. The connections shown are for right-hand justified
data. CS and WR inputs to the DAC are also gated, and when
active, the DAC is loaded. Pull-up resistors at the output of the
74LS244 buffer ensure that the inputs to the DAC do not float at
an ill-defined level when the DAC is not being addressed. This
method of connecting 12-bit DACs to an 8-bit data bus is most
cost effective when multiple DACs are utilized for 8-bit data bus
applications.
Figure 13. 8-Bit Data Bus Interface
APPLICATIONS
The functional density of the AD394 permits complex analog
functions to be produced under digital control, where board
space requirements would otherwise be prohibitive. Multiple-
output plotters, multichannel displays, complex waveform
generation, and multiple programmable voltage sources can all
be implemented with the AD394 in a fraction of the space that
would be needed if separate DACs were used.
Using the AD394 for Analog-to-Digital Conversion
Many systems require both analog output and analog input
capability. While complete integrated circuit analog-to-digital
converters (such as the AD574A) are readily available, the
AD394 can be used as the precision analog section of an ADC
if some external logic is available. Several types of analog-to-
digital converters can be built with a DAC, comparator, and
control logic, including staircase, tracking, and successive-
approximation types. In systems that include a micropro-cessor,
only a comparator must be added to the AD394 to accomplish
the ADC function since the processor can perform the required
digital operations under software control. A suitable circuit is
shown in Figure 14. The AD311 comparator compares the
unknown input voltage to one of the AD394 outputs for the
analog-to-digital conversion, while the other three outputs are
used as normal DACs. The diode clamp shown limits the
voltage swing at the comparator input and improves conversion
speed. With careful layout, a new compar-ison can be
performed in less than 15 µs, resulting in a 12-bit successive
approximation conversion in under 180 µs. The benefit of using
the AD394 in this application is that one ADC and three DACs
can be implemented with only two IC packages (the AD394 and
the comparator).
Figure 14. Using One AD394 Output for A/D Conversion
Programmable Window Comparator
The AD394 can be used to perform limit testing of responses to
digitally controlled input signals. For example, two DACs may
be used to generate software-controlled test conditions for a
component or circuit. The response to these input conditions
can be either completely converted from analog to digital or
simply tested against high and low limits generated by the two
DACs in the AD394.
Figure 15. Programmable Window Comparator
Used in Power-Supply Testing
In the circuit shown in Figure 15, two AD311 voltage compar-
ators are used within the AD394 to test the output of a 5 V
power-supply regulator. The AD394 VOUT1 output (through an
appropriate current booster) drives the input to the regulator to
simulate variations in input voltage. The output of the regulator
is applied to Comparators 1 and 2, with their outputs wire-


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