PAM8007 Datasheet, PDF (11/16 Pages) Power Analog Micoelectronics – Filterless 3W Class-D Stereo Audio Amplifier with DC Volume Control and Headphone Output

PAM8007
Filterless 3W Class-D Stereo Audio Amplifier
with DC Volume Control and Headphone Output
Test Setup for Performance Testing(Class D)
Application Notice
1. When the PAM8007 works with LC filters, it
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
make the device damaged. Therefore, it'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
by 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.
Audio Precision
(AP) System
Generator
PAM8007 Demo Board
Input
+OUT
Load
GND
-OUT
VDD
AP
Low Pass
Filter
A U X -0 0 2 5
AP System
Analyzer
Power Supply
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.
Power Analog Microelectronics, Inc
www.poweranalog.com
11
01/2012 Rev1.2