OP113(RevC) Просмотр технического описания (PDF) - Analog Devices

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OP113
(Rev.:RevC)

Low Noise, Low Drift Single-Supply Operational Amplifiers

Analog Devices 

OP113/OP213/OP413

Supply Splitter Circuit

The OP113 family has excellent frequency response characteris-

tic that makes it an ideal pseudo-ground reference generator as

shown in Figure 6. The OP113 family serves as a voltage fol-

lower buffer. In addition, it drives a large capacitor that serves

as a charge reservoir to minimize transient load changes, as well

as a low impedance output device at high frequencies. The

circuit easily supplies 25 mA load current with good settling

characteristics.

R1

5k⍀

R2

5k⍀

VS+ = +5V +12V

R3

2.5k⍀

C1

0.1␮F

8

2

1/2 OP113 1

3

4

R4

100⍀

+

C2

1␮F

VS+ OUTPUT

2

Figure 6. False Ground Generator

Low Noise Voltage Reference

Few reference devices combine low noise and high output drive

capabilities. Figure 7 shows the OP113 family used as a two-

pole active filter that band limits the noise of the 2.500 V refer-

ence. Total noise measures 3 µV p-p.

+5V

2

IN

OUT 6

REF43

GND

4

–

10␮F

+

10k⍀

10k⍀

+5V

8

2

1/2 OP113 1

OUTPUT

+2.500V

3

+

C2

10␮F

4

3␮V p-p NOISE

Figure 7. Low Noise Voltage Reference

+5 V Only Stereo DAC for Multimedia

The OP113 family’s low noise and single supply capability are

ideally suited for stereo DAC audio reproduction or sound

synthesis applications such as multimedia systems. Figure 8

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 OP113 family can also be powered from the same supplies.

+5V SUPPLY

AD1868

1 VL 18-BIT

LL DAC

2

VBL

16

15

3

18-BIT

DL SERIAL

REG.

4 CK

DR

5

18-BIT

LR SERIAL

6

REG.

7 DGND

18-BIT

DAC

8

VBR

14

VOL

VREF

13

AGND 12

VREF

11

VOR

10

VS 9

7.68k⍀ 9.76k⍀

330pF

7.68k⍀ 9.76k⍀

330pF

8

220␮F

LEFT

1/2 OP213 1

+–

CHANNEL

OUTPUT

47k⍀

100pF

7.68k⍀

7.68k⍀

100pF

6

220␮F RIGHT

1/2 OP213 7 + –

CHANNEL

OUTPUT

5

47k⍀

Figure 8. +5 V Only 18-Bit Stereo DAC

SoundPort is a registered trademark of Analog Devices, Inc.

REV. C

–7–

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