AD8519(2003) 데이터 시트보기 (PDF) - Analog Devices
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AD8519 Datasheet PDF : 12 Pages
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AD8519/AD8529
Slew rate related distortion would not be present at the lower
voltages because the AD8519 is so fast at 2.1 V/ms. A general
rule of thumb for determining the necessary slew rate for an
audio system is to take the maximum output voltage range of
the device given the design’s power rails and divide by two.
In Figure 2, the power rails are 2.7 V and the output is rail-to-
rail. Enter these numbers into the equation: 2.7/2 is 1.35 V and
the minimum ideal slew rate is 1.35 V/ms.
While this data sheet gives only one audio example, many audio
circuits are enhanced with the use of the AD8519. Following
are a few examples: active audio filters such as bass, treble, and
equalizers; PWM filters at the output of audio DACs; buffers and
summers for mixing stations; and gain stages for volume control.
2.7V
1k⍀
MIC
IN
C1
1F
1nF
NPO
3.09k⍀
240pF
30.9k⍀
2.7V
AD8519
CODEC LINE IN
OR MIC IN
48k⍀
46.4k⍀
93.1k⍀
2.7V
10F ELECT
Figure 2. 10ϫ Microphone Preamplifier
Two-Element Varying Bridge Amplifier
There are a host of bridge configurations available to designers.
For a complete analysis, look at the ubiquitous bridge and its differ-
ent forms. Please refer to the 1992 Amplifier Applications Guide*.
Figure 3 is a schematic of a two-element varying bridge. This con-
figuration is commonly found in pressure and flow transducers.
With two-elements varying, the signal will be 2¥ as compared to
a single-element varying bridge. The advantages of this type of
bridge are gain setting range, no signal input equals 0 V out, and
single-supply application. Negative characteristics are nonlinear
operation and required R matching. Given these sets of conditions,
requirements, and characteristics, the AD8519 can be success-
fully used in this configuration because of its rail-to-rail output
and low offset. Perhaps the greatest benefits of the AD8519,
when used in the bridge configuration, are the advantages it can
bring when placed in a remote bridge sensor. For example, the
tiny SC70 and SOT-23 packages will reduce the overall sensor
size; low power allows for remote powering via batteries or solar
cells, high output current drive to drive a long cable, and 2.7 V
operation for two-cell operation.
2.7V
RF
R
R
AD8519
R
R
RF
Figure 3. Two-Element Varying Bridge Amplifier
*Adolfo Garcia and James Wong, Chapter 2, 1992 Amplifier Applications Guide.
–10–
REV. C
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