OP183_05 Datasheet, PDF (13/16 Pages) Analog Devices – 5 MHz Single-Supply Operational Amplifier

OP183
APPLICATIONS
OFFSET ADJUST
Figure 33 shows how the offset voltage of the OP183 can be
adjusted by connecting a potentiometer between Pins 1 and 5,
and connecting the wiper to VEE. The recommended value for
the potentiometer is 10 kΩ. This will give an adjustment range
of approximately ±1 mV. If a larger adjustment span is desired, a
50 kΩ potentiometer will yield a range of ±2.5 mV.
V_CC
7
3
OP183 6
V_OS
2
4
5
1
V_EE
Figure 33. OP183 Offset Adjust
PHASE REVERSAL
The OP183 is protected against phase reversal as long as both of
the inputs are within the range of the positive supply and the
negative supply −0.6 V. If there is a possibility of either input
going beyond these limits, however, the inputs should be
protected with a series resistor to limit input current to 2 mA.
DIRECT ACCESS ARRANGEMENT
The OP183 can be used in a single supply direct access
arrangement (DAA) as shown in Figure 34. This figure shows a
portion of a typical DAA capable of operating from a single 5 V
supply; with minor modifications it should also work on 3 V
supplies. Amplifiers A2 and A3 are configured so that the
transmit signal TxA is inverted by A2 and 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
ability of the OP183 to drive capacitive loads and to save power
in single-supply applications.
300pF
37.4kΩ
0.1μF
RxA
A1
OP183
0.0047μF
20kΩ
20kΩ
3.3kΩ
A2
OP183
475Ω
0.1μF
TxA
20kΩ
22.1kΩ
750pF _20kΩ
0.33μF
REF
2.5V
20kΩ
A3
OP183
Figure 34. Direct Access Arrangement
5 V ONLY STEREO DAC FOR MULTIMEDIA
The low noise and single-supply capability of the OP183 are
ideally suited for stereo DAC audio reproduction or sound
synthesis applications, such as multimedia systems. Figure 35
shows an 18-bit stereo DAC output setup that is powered from a
single 5 V supply. The low noise preserves the 18-bit dynamic
range of the AD1868.
AD1868
1 V_L
16-BIT
LL
2
DAC
DL
3
CK
4
18-BIT
SERIAL
REG.
DR
5
LR
6
18-BIT
SERIAL
REG.
7 DGND
VBR
8
16-BIT
DAC
V_REF
V_REF
VBL
16
15
14
VOL
13
AGND 12
11
VOR
10
V_{S 9}
7.68kΩ
330pF
9.76kΩ
8
3
OP183 ¹
2
4
100pF
220μF
+–
LEFT
CHANNEL
47kΩ ^OUTPUT
7.68kΩ
7.68kΩ
7.68kΩ
330pF
9.76kΩ
100pF
6
OP183
5
220μF
7 ^+–
RIGHT
CHANNEL
47kΩ ^OUTPUT
Figure 35. 5 V Only 18-Bit Stereo DAC
Rev. D | Page 13 of 16