A2323
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.65W CLASS-D AUDIO POWER AMPLIFIER
Test Method
The A2323 is a class-D power amplifier, which the output wave form was modulated by the PWM square
wave signal. The output port of the power amplifier can be connected with audio signal filter to filter out the
PWM switching frequency energy between the test, obtain Intuitive analog output signal convenient for
analyzing, both differential output port signal loaded to the speaker audio driving signal. The audio filter can
be design by either the AP professional audio analyzer, or simple RC filter, as figure 1.
Figure 1 A2323 Testing Circuit Schematic
Low PASS Filter
Recommended low pass filter resistor, capacitor as below table.
Filter Type
Filter Resistor
R :500Ω
Filter Capacitor
10nF
Low Pass Cut off frequency
32kHz
34kHz
RC Filter
R: 1kΩ
4.7nF
A2323 recommended filter for test
Power Gain calculation
According to the above testing method, an differential signal obtain form the low pass filter output port, using
The oscillation scope to testing the effectively differential analog signal level VO_rms, as Figure 2.
Figure 2 Effectively output signal diagram
REV3.0
- MAY 2013 RELEASED, APR 2016 UPDATED -
- 10 -
AITSEMI [ AiT Semiconductor ]
