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OP113EP View Datasheet(PDF) - Analog Devices

Part NameDescriptionManufacturer
OP113EP Low Noise, Low Drift Single-Supply Operational Amplifiers ADI
Analog Devices ADI
OP113EP Datasheet PDF : 16 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
OP113/OP213/OP413
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.
OPTIONAL
GAIN
1k
VREF
LOUT1L 31
10F
10k
L VOLUME
CONTROL
5k
+5V
1/2
OP213
16
220F
+
47k
HEADPHONE
LEFT
AD1849
VREF
+5V
1/2
OP213
CMOUT 19
10k
LOUT1R 29
10F
R VOLUME
CONTROL
1/2
OP213
5k
1kOPTIONAL
GAIN
VREF
16
220F
+
47k
HEADPHONE
RIGHT
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.
LEFT
ELECTRET
CONDENSER
MIC
INPUT
RIGHT
ELECTRET
CONDENSER
MIC
INPUT
10F 50
20
10k
+5V
1/2
OP213
20
10F
10k
50
10k
+5V
1/2
OP213
100
100
1/2
OP213
17 MINL
AD1849
19 CMOUT
15 MINR
10k
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.
+2.5V
0V
–2.5V
tr = tf = 5ms
؎10mV OVERDRIVE
+5V
25k
100
1/2
OP113
2V
100
90
5s
10
0%
2V
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.
Figure 10. Low Noise Stereo Microphone Amplifier for
Multimedia Sound Codec
SoundPort is a registered trademark of Analog Device, Inc.
–8–
REV. C
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