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OP283GP 데이터시트(PDF) 9 Page - Analog Devices

부품명 OP283GP
상세설명  5 MHz Single-Supply Operational Amplifiers
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OP283GP 데이터시트(HTML) 9 Page - Analog Devices

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REV.B
OP183/OP283
APPLICATIONS
OP183 Offset Adjust
Figure 36 shows how the OP183’s offset voltage can be adjusted by
connecting a potentiometer between Pins 1 and 5, and connecting
the wiper to V
EE. The recommended value for the potentiometer is
10 k
Ω. This will give an adjustment range of approximately ±1 mV.
If larger adjustment span is desired, a 50 k
Ω potentiometer will
yield a range of
±2.5 mV.
Figure 37. Direct Access Arrangement
+5 Volt Only Stereo DAC for Multimedia
The OP283’s low noise and single supply capability are ideally
suited for stereo DAC audio reproduction or sound synthesis
applications such as multimedia systems. Figure 38 shows an 18-bit
stereo DAC output setup that is powered from a single +5 volt
supply. The low noise preserves the 18-bit dynamic range of the
AD1868. For DACs that operate on dual supplies, the OP283 can
also be powered from the same supplies.
Figure 38. +5 Volt Only 18-Bit Stereo DAC
Low Voltage Headphone Amplifiers
Figure 39 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 convenient
bias for the headphone output amplifiers.
1
7
6
5
4
3
2
VOS
VCC
VEE
OP183
Figure 36. OP183 Offset Adjust
Phase Reversal
The OP183 family is protected against phase reversal as long as
both of the inputs are within the range of the positive supply and
the negative supply minus 0.6 volts. However if there is a possibility
of either input going beyond these limits, then the inputs should be
protected with a series resistor to limit input current to 2 mA.
Direct Access Arrangement
The OP183/OP283 can be used in a single supply Direct Access
Arrangement (DAA) as is shown in Figure 37. This figure shows a
portion of a typical DAA capable of operating from a single +5 volt
supply and it should also work on +3 volt supplies with minor
modifications. Amplifiers A2 and A3 are configured so that the
transmit signal TXA is inverted by A2 and is not inverted by A3.
This arrangement drives the transformer differentially so that the
drive to the transformer is effectively doubled over a single amplifier
arrangement. This application takes advantage of the OP183/283’s
ability to drive capacitive loads, and to save power in single supply
applications.
Figure 39. Headphone Output Amplifier for Multimedia
Sound Codec
20kΩ
20kΩ
3.3kΩ
22.1kΩ
20kΩ
20kΩ
OP283
OP283
OP283
750pF
475Ω
0.33µF
0.1µF
2.5VREF
0.0047µF
0.1µF
20kΩ
37.4kΩ
300pF
A1
A2
A3
RXA
TXA
SoundPort is a registered trademark of Analog Devices Inc.
1/2 OP283
+5V
1/2 OP283
5kΩ
OPTIONAL
GAIN
1kΩ
V
REF
1/2 OP283
+5V
V
REF
OPTIONAL
GAIN
1k
5kΩ
29
19
31
10kΩ
10µF
LOUT1L
LOUT1R
CMOUT
AD1849
V
REF
10µF
10kΩ
L VOLUME
CONTROL
R VOLUME
CONTROL
16Ω
220µF
47kΩ
HEADPHONE
LEFT
16Ω
220µF
47kΩ
HEADPHONE
RIGHT
47kΩ
47kΩ
8
1
4
3
2
1/2 OP283
7.68k
9.76kΩ
330pF
100pF
7.68kΩ
7
5
6
1/2 OP283
7.68kΩ
9.76kΩ
330pF
100pF
7.68kΩ
LEFT
CHANNEL
OUTPUT
RIGHT
CHANNEL
OUTPUT
220µF
220µF
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AD1868
VL
LL
DL
CK
DR
LR
DGND
VBR
VBL
VOL
AGND
VOR
VS
+5V SUPPLY
18-BIT
SERIAL
REG.
18-BIT
SERIAL
REG.
VREF
18-BIT
DAC
18-BIT
DAC
VREF
–9–


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