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OP113EP Arkusz danych(PDF) 8 Page - Analog Devices

Numer części OP113EP
Szczegółowy opis  Low Noise, Low Drift Single-Supply Operational Amplifiers
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Strona internetowa  http://www.analog.com
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OP113EP Arkusz danych(HTML) 8 Page - Analog Devices

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OP113/OP213/OP413
–8–
REV. C
Precision Voltage Comparator
With its PNP inputs and zero volt common-mode capability, the
OP113 family can make useful voltage comparators. There is
only a slight penalty in speed in comparison to IC comparators.
However, the significant advantage is its voltage accuracy. For
example, VOS can be a few hundred microvolts or less, combined
with CMRR and PSRR exceeding 100 dB, while operating on
5 V supply. Standard comparators like the 111/311 family oper-
ate on 5 volts, but not with common-mode at ground, nor with
offset below 3 mV. Indeed, no commercially available single
supply comparator has a VOS less than 200
µV.
Figure 11 shows the OP113 family response to a 10 mV over-
drive signal when operating in open loop. The top trace shows
the output rising edge has a 15
µs propagation delay, while the
bottom trace shows a 7
µs delay on the output falling edge. This
ac response is quite acceptable in many applications.
+5V
100
25k
0V
–2.5V
+2.5V
tr = tf = 5ms
10mV OVERDRIVE
1/2
OP113
10
90
100
0%
2V
2V
5 s
Figure 11. Precision Comparator
The low noise and 250
µV (maximum) offset voltage enhance
the overall dc accuracy of this type of comparator. Note that
zero crossing detectors and similar ground referred comparisons
can be implemented even if the input swings to –0.3 volts below
ground.
Low Voltage Headphone Amplifiers
Figure 9 shows a stereo headphone output amplifier for the
AD1849 16-bit SoundPort
® Stereo Codec device. The pseudo-
reference voltage is derived from the common-mode voltage
generated internally by the AD1849, thus providing a conve-
nient bias for the headphone output amplifiers.
1/2
OP213
+5V
1/2
OP213
5k
OPTIONAL
GAIN
1k
VREF
1/2
OP213
+5V
VREF
OPTIONAL
GAIN
1k
5k
29
19
31
10k
LOUT1L
LOUT1R
CMOUT
AD1849
VREF
10 F
10k
L VOLUME
CONTROL
R VOLUME
CONTROL
16
220 F
47k
HEADPHONE
LEFT
HEADPHONE
RIGHT
10 F
+
16
220 F
47k
+
Figure 9. Headphone Output Amplifier for Multimedia
Sound Codec
Low Noise Microphone Amplifier for Multimedia
The OP113 family is ideally suited as a low noise microphone
preamp for low voltage audio applications. Figure 10 shows a
gain of 100 stereo preamp for the AD1849 16-bit SoundPort
Stereo Codec chip. The common-mode output buffer serves as
a “phantom power” driver for the microphones.
+5V
1/2
OP213
10k
50
10 F
20
100
10k
+5V
1/2
OP213
20
50
10 F
10k
1/2
OP213
10k
100
15
17
MINL
MINR
CMOUT
AD1849
RIGHT
ELECTRET
CONDENSER
MIC
INPUT
LEFT
ELECTRET
CONDENSER
MIC
INPUT
19
Figure 10. Low Noise Stereo Microphone Amplifier for
Multimedia Sound Codec
SoundPort is a registered trademark of Analog Device, Inc.


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