Updated: 16 Feb 2001

CONTENTS.

• Introduction.
• Specs.
• Decoupling & Stability.
• Fig a. Distortion versus loading.

INTRODUCTION.
The MC33078 (SGS-Thompson and OnSemi) is a dual opamp claiming "low noise".

SPECS.
Here are the vital statistics:
All typical values, for +/-15V supply rails.

Supply voltage	+/-
Output range	+/-
CM range	+/-
en	4.5nV/rtHz typ 1 kHz
in	0.5pA/rtHz typ 1 kHz
Ibias	250nA
Slew rate:	7 V/us
Supply current	4 mA
Unity gain stable	Yes
Cost	72p RS Jan 2001

DECOUPLING AND STABILITY.
No particular difficulties were encountered.

	MC33078 driving 1K load at 7.75 Vrms. Series feedback, gain= 3.2x
	MC33078 driving 2K load at 7.75 Vrms reasonably well, but 500 Ohms cannot be driven with low distortion. Not as good as 5532.