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AD8592ARM Scheda tecnica(PDF) 10 Page - Analog Devices

Il numero della parte AD8592ARM
Spiegazioni elettronici  CMOS Single Supply Rail-to-Rail Input/Output Operational Amplifiers with Shutdown
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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AD8592ARM Scheda tecnica(HTML) 10 Page - Analog Devices

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AD8591/AD8592/AD8594
–10–
REV. A
If gain is required from the output amplifier, four additional
resistors should be added as shown in Figure 35. The gain of
the AD8592 can be set as:
A
R
R
V
=
7
6
(5)
U1-A
R2
2k
4
C1
100 F
+5V
1
10
2
3
5
+5V
VDD
VDD
LEFTOUT
AD1881
(AC97)
RIGHTOUT
VSS
R4
20
+5V
R1
100k
7
8
6
9
R5
20
C2
100 F
NOTE: ADDITIONAL PINS
OMITTED FOR CLARITY
U1-B
U1 = AD8592
R3
2k
R7
20k
R7
20k
VREF
R6
10k
R6
10k
AV =
= +6dB WITH VALUES SHOWN
R7
R6
NC
38
35
27
36
Figure 35. A PC-98 Compliant Headphone/Line Out
Amplifier With Gain
Input coupling capacitors are not required for either circuit as
the reference voltage is supplied from the AD1881.
R4 and R5 help protect the AD8592 output in case the output
jack or headphone wires accidentally get shorted to ground.
The output coupling capacitors C1 and C2 block dc current
from the headphones and create a high-pass filter with a corner
frequency of:
f
CR
R
dB
L
–3
1
21
4
=
+
()
π
(6)
Where RL is the resistance of the headphones.
A Combined Microphone and Speaker Amplifier for
Cellphone and Portable Headsets
The dual amplifiers in the AD8592 make an efficient design for
interfacing with a headset containing a microphone and speaker.
Figure 36 demonstrates a simple method for constructing an
interface to a codec.
U1-A
4
+5V
1
10
2
3
5
C2
10 F
U1 = AD8592
7
8
6
9
R5
10k
U1-B
R6
10k
(OPTIONAL)
R4
10k
FROM CODEC
MONO OUT
(OR LEFT OUT)
TO
CODEC
R3
100k
VREF
FROM CODEC
MIC + SPEAKER
JACK
R1
2.2k
+5V
R2
10k
R8
100k
+5V
C1
0.1 F
NC
(RIGHT OUT)
R7
1k
Figure 36. A Speaker/Mic Headset Amplifier Circuit
U1-A is used as a microphone preamplifier, where the gain of
the preamplifier is set as R3/R2. R1 is used to bias an electret
microphone and C1 blocks any dc voltages from the amplifier.
U1-B is the speaker amplifier, and its gain is set at R5/R4. To
sum a stereo output, R6 should be added, equal in value to R4.
Using the same principle as described in the previous section,
the normalizing contact on the microphone/speaker jack can be
used to put the AD8592 into shutdown when the headset is not
plugged in. The AD8592 shutdown inputs can also be con-
trolled with TTL or CMOS compatible logic, allowing micro-
phone or speaker muting if desired.
An Inexpensive Sample-and-Hold Circuit
The independent shutdown control of each amplifier in the
AD8592 allows a degree of flexibility in circuit design. One par-
ticular application for which this feature is useful is in designing a
sample-and-hold circuit for data acquisition. Figure 37 shows a
schematic of a simple, yet extremely effective sample-and-hold
circuit using a single AD8592 and one capacitor.
VIN
U1-A
C1
1nF
U1-B
SAMPLE
AND HOLD
OUTPUT
+5V
1
2
3
5
9
8
7
6
SAMPLE
CLOCK
U1 = AD8592
+5V
4
10
Figure 37. An Efficient Sample-and-Hold Circuit


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