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OP283GS Folha de dados(PDF) 10 Page - Analog Devices

Nome de Peças OP283GS
Descrição Electrónicos  5 MHz Single-Supply Operational Amplifiers
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REV. B
OP183/OP283
Low Noise Microphone Amplifier for Multimedia
The OP183 family is ideally suited as a low noise microphone
preamp for low voltage audio applications. Figure 40 shows a gain
of 100 stereo preamp for the AD1849 16-bit SoundPort Stereo
Codec chip. The common-mode output buffer serves as a “phan-
tom power” driver for the microphones.
bandwidth and is not sensitive to false-ground perturbations. The
simple false-ground circuit shown achieves good rejection of low
frequency interference using standard off-the-shelf components.
Amplifier A3 biases A1 and A2 to the middle of their input
common-mode range. When operating on a +3 V supply, the
center of the OP283’s common-mode range is 0.75 V. This notch
filter effectively squelches 60 Hz pickup at a filter Q of 0.75. To
reject 50 Hz interference, simply change the resistors in the twin-T
section (R1 through R5) from 2.67 k
Ω to 3.16 kΩ.
The filter section uses an OP283 dual op amp in a twin-T configu-
ration whose frequency selectivity is very sensitive to the relative
matching of the capacitors and resistors in the twin-T section.
Mylar is the material of choice for the capacitors, and the relative
matching of the capacitors and resistors determines the filter’s pass
band symmetry. Using 1% resistors and 5% capacitors produces
satisfactory results.
A Low Voltage Frequency Synthesizer for Wireless
Transceiver
The OP183’s low noise and the low voltage operation capability
serves well for the loop filter of a frequency synthesizer. Figure 42
shows a typical application in a radio transceiver. The phase noise
performance of the synthesizer depends on low noise contribution
from each component in the loop as the noise is amplified by the
frequency division factor of the prescaler.
CRYSTAL
+3V
VARACTER
DIODE
900MHz
REFERENCE
OSCILLATOR
PHASE
DETECTOR
÷
PRESCALER
RF
OUT
V
CONTROL
VCO
OP183
Figure 42. A Low Voltage Frequency Synthesizer for a
Wireless Transceiver
The resistors used in the low-pass filter should be of low to
moderate values to reduce noise contribution due to the input bias
current as well as the resistors themselves. The filter cutoff
frequency should be chosen to optimize the loop constant.
10kΩ
50Ω
20Ω
100Ω
20Ω
50Ω
10kΩ
10kΩ
100Ω
10kΩ
+5V
1/2 OP283
10µF
+5V
1/2 OP213
10µF
1/2 OP283
15
17 MINL
MINR
19 CMOUT
AD1849
LEFT
ELECTRET
CONDENSER
MIC
INPUT
RIGHT
ELECTRET
CONDENSER
MIC
INPUT
Figure 40. Low Noise Stereo Microphone Amplifier for
Multimedia Sound CODEC
A +3 Volt 50 Hz/60 Hz Active Notch Filter with False Ground
To process ac signals, it may be easier to use a false-ground bias
rather than the negative supply as a reference ground. This would
reject the power-line frequency interference which oftentimes can
obscure low frequency physiological signals, such as heart rates,
blood pressures, EEGs, ECGs, et cetera.
R10
25k
R8
1k
8
1
4
3
2
A1
+3V
C1
1µF
R1
2.67k
R3
2.67k
C2
1µF
R4
2.67k
1/2 OP283
R6
10k
V
IN
R5
1.33k
(2.67k
Ω ÷ 2)
×C3
2µF
(1µF
× 2)
7
6
5
A2
V
O
1/2 OP283
R7
1k
1
3
2
A3
OP183
C5
0.015µF
R11
10k
R12
70
0.75V
C6
1µF
+3V
C4
1µF
A1, A2, AND A3 = 1/2 OP283
Q = 0.75
NOTE: FOR 50Hz APPLICATIONS
CHANGE R1–R4 TO 3.1k
AND R5 TO 1.58k
Ω (3.16kΩ ÷ 2).
R2
2.67k
R9
75k
Figure 41. +3 Volt Supply 50 Hz/60 Hz Notch Filter with
Pseudo Ground
Figure 41 shows a 50 Hz/60 Hz active notch filter for eliminating
line noise in patient monitoring equipment. It has several kilohertz
–10–


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