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Power Analog Microelectronics Inc

PAM8007

Filterless 3W Class-D Stereo Audio Amplifier

with DC Volume Control and Headphone Output

www.poweranalog.com

Notes

1. The Audio Precision(AP) AUX-0025 low pass filter is necessary for class-D amplifier measurement

with AP analyzer.

2. Two 22µH inductors are used in series with load resistor to emulate the small speaker for effic iency

measurement.

Test Setup for Performance Testing(Class D)

Audio Precision

(AP) System

Generator

PAM8007 Demo Board

+OUT

Input

Load

AP

Low Pass

Filter

AUX-0025

AP System

Analyzer

GND

-OUT

VDD

Power Supply

Application Notice

should be connected with the speaker before it's

powered on, otherwise it will be damaged easily.

2.

When the PAM8007 works without LC filters,

it's better to add a ferrite chip bead at the outgoing

line of speaker for suppressing the possible

electromagnetic interference.

3.

The absolute maximum rating of the PAM8007

operation voltage is 6.0V. When the PAM8007 is

powered with 4 battery cells, it should be noted

that the voltage of 4 new dry or alkaline batteries is

over 6V, higher than its maximum operation

voltage, which probably

m a k e t h e d e v i c e d a m a g e d . T h e r e f o r e , i t ' s

recommended to use either 4 Ni-MH (Nickel Metal

Hydride) rechargeable batteries or 3 dry or alkaline

batteries.

4.

The input signal should not be too high, if too

high ,it will cause the clipping of output signal when

increasing the volume. Because the DC volume

control of the PAM8007 has big gain, it will make

the device damaged.

5.

When testing the PAM8007 without LC filters

b y using resistor instead of speaker as the output

load, the test results, e.g. THD or efficiency, will be

worse than those using speaker as load.

01/2012 Rev1.2