Philips Semiconductors

Product specification

NE/SA5230

Low voltage operational amplifier

1994 Aug 31

13

HALF-WAVE

a

b

+VIN

–VIN

a

b

+VIN

–VIN

ab

+VIN

+VB

FULL-WAVE

2a

–2VIN

0

VEE

VEE

VCC

+VB

R1

3

2

4

5

6

7

R2

R3

R5

R4

2

3

4

5

6

7

+

–

+

–

A1

A2

INPUT

HALF-WAVE

OUTPUT

FULL-WAVE

OUTPUT

500mV

500mV

500mV

520

µs

NOTES:

R2 = 2 R1

R4 = R5 = R3

+VB will vary output reference.

For single supply operation VEE can be grounded on A2.

SL00259

Figure 10. Adding an Inverting Summer to the Input and Output of the Half-Wave will Result in Full-Wave

CONCLUSION

The NE5230 is a versatile op amp in its own right. The part was

designed to give low voltage and low power operation without the

limitations of previously available amplifiers that had a multitude of

problems. The previous application examples are unique to this

amplifier and save the user money by excluding various passive

components that would have been needed if not for the NE5230’s

special input and output stages.

The NE5230 has a combination of novel specifications which allows

the designer to implement it easily into existing low-supply voltage

designs and to enhance their performance. It also offers the

engineer the freedom to achieve greater amplifier system design

goals. The low input referenced noise voltage eases the restrictions

on designs where S/N ratios are important. The wide full-power

bandwidth and output load handling capability allow it to fit into

portable audio applications. The truly ample open-loop gain and low

power consumption easily lend themselves to the requirements of

remote transducer applications. The low, untrimmed typical offset

voltage and low offset currents help to reduce errors in signal

processing designs. The amplifier is well isolated from changes on

the supply lines by its typical power supply rejection ratio of 105dB.

REFERENCES

Johan H. Huijsing,

Multi-stage Amplifier with Capacitive Nesting for

Frequency Compensation, U.S. Patent Application Serial

No. 602.234, filed April 19, 1984.

Bob Blauschild,

Differential Amplifier with Rail-to-Rail Capability,

U.S. Patent Application Serial No. 525.181, filed August 23, 1983.

Operational Amplifiers - Characteristics and Applications,

Robert G. Irvine, Prentice-Hall, Inc., Englewood Cliffs, NJ 07632, 1981.

Transducer Interface Handbook - A Guide to Analog Signal

Conditioning, Edited by Daniel H. Sheingold, Analog Devices, Inc.,

Norwood, MA 02062, 1981.