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AD394TD/883B View Datasheet(PDF) - Analog Devices

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AD394TD/883B Datasheet PDF : 12 Pages
First Prev 11 12
OR’ed with LED indicators as shown. The test limits for each
comparator are programmed by the AD394 VOUT2 and VOUT3
outputs. When the output of the device under testing is within
the limits, both comparators are off and D1 lights. If the output
is above or below the limits, either D4 or D5 lights.
AD394 as a Multiplier and Attenuator
So far, it has been assumed that the reference voltage VREFIN is
fixed. In fact, VREFIN can be any voltage within the range of
−11 V < VREFIN < +11 V. It can be negative, positive, sinusoidal, or
whatever the user prefers. This leads to the name “multiplying
D/A converters” because the output voltage, VOUT, is propor-
tional to the product of the digital input word and the voltage at
the VREFIN terminal.
( ) VOUT = − 1 VREFIN
D
(4096 )
(0 < D < 4095)
D is the fractional binary value of the digital word applied to the
converter. The AD394 multiplies the digital input value by the
analog input voltage at VREFIN for any value of VREFIN up to
22 V p-p. This in itself is a powerful tool. Applications requiring
precision multiplication with minimal zero offset and very low
distortion should consider the AD394 as a candidate. One pop-
ular use for the AD394 is as an audio frequency attenuator. The
audio signal is applied to the VREFIN input and the attenuation
AD394
code is applied to the DAC; the output voltage is the product of
the two—an attenuated version of the input. The maximum
attenuation range obtainable utilizing 12 bits is 4096:1 or 72 dB.
Figure 16. AD394 as a Multiplier or Attenuator
Rev. A | Page 11 of 12
 

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