Diodes PAM8007 - Manual (Page 13)

PAM8007
Document number: DSxxxxx Rev. 1 - 2
13 of 17
www.diodes.com
October 2012
© Diodes Incorporated
PAM8007
A Product Line of
Diodes Incorporated
Application Information
(cont.)
Test Setup for Performance Testing (Class D)
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 four battery cells, it should be
noted that the voltage of four 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 four Ni-MH (Nickel Metal Hydride) rechargeable batteries or three 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.
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 efficiency measurement.