OP183GSZ datasheet(13/16 Pages) AD

13 / 16 page

OP183

Rev. D | Page 13 of 16

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.

OP183

VEE

VCC

VOS

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.

OP183

0.0047

μF

3.3k

22.1k

750pF 20kΩ

20k

475

20k

0.1

μF

37.4k

300pF

0.33

μF

0.1

μF

20k

RxA

TxA

2.5V

REF

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.

OP183

+–

220

μF

47k

9.76k

100pF

7.68k

LEFT

CHANNEL

OUTPUT

330pF

7.68k

OP183

+–

220

μF

47k

9.76k

100pF

7.68k

RIGHT

CHANNEL

OUTPUT

330pF

7.68k

VBL

VOL

AGND

VOR

DGND

VBR

VREF

16-BIT

DAC

18-BIT

SERIAL

REG.

VREF

16-BIT

DAC

18-BIT

SERIAL

REG.

AD1868

Figure 35. 5 V Only 18-Bit Stereo DAC

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