LM2878 datasheet(5/8 Pages) NSC

5 / 8 page

Connection Diagram

Single-In-Line Package

TLH7934 – 5

Top View

Pin 6 must be connected to GND

Order Number LM2878P

See NS Package Number P11A

Application Hints

The LM2878 is an improved LM378 in typical audio applica-

tions In the LM2878 the internal voltage regulator for the

input stage is generated from the voltage on pin 1 Normally

the input common-mode range is within g07V of this pin 1

voltage Nevertheless the common-mode range can be in-

creased by externally forcing the voltage on pin 1 One way

to do this is to short pin 1 to the positive supply pin 11

The only special care required with the LM2878 is to limit

the maximum input differential voltage to g7V If this differ-

ential voltage is exceeded the input characteristics may

change

Figure 2 shows a power op amp application with AV e 1

The 100k and 10k resistors set a noise gain of 10 and are

dictated by amplifier stability The 10k resistor is boot-

strapped by the feedback so the input resistance is domi-

nated by the 1 MX resistor

TLH7934 – 6

FIGURE 2 Operational Power Amplifier AV e 1

LM2878 Datenblatt(PDF) 5 Page - National Semiconductor (TI)