A2323
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2.65W CLASS-D AUDIO POWER AMPLIFIER
Radiation noise suppression
The input audio signal module layout, output audio signal module layout, speaker driving loop, even the
power net and ground plane could be affect by radiated RF jamming, longer input net layout, output net layout
resembled antenna effect, especially easy affect by RF radiated effect. The reasonable PCB layout design
reducing radiated RF effect, like shorten input net layout, output net layout length; The audio circuit
component stayed away from RF antenna as far as possible and keep shielded from RF antenna; Maintain all
the audio signal channel component integrity; Connect small capacitor to ground in sensitive point to bypass
RF signal. But in practical application, PCB layout hardly full scale evaluate the effect from radiated RF to
audio signal channel, however some RF energy coupling through audio signal channel, become the auditable
TDD noise. The A2323 design with special radiated RF suppression circuit internally, created mask shielding
inside the chip, effectively brocaded High frequency RF energy penetrating the chip, guarantee the power
amplifier speaker output driven signal in affect by antenna RF radiated effect, finally avoided TDD noise from
antenna radiated RF.
Figure 4 Diagram of radiated RF
Filter Less
The A2323 designed with filter less PWM modulation, cut tradition class-D power amplifier LC filter, enhance
the efficiency, provided smaller size, and contributed better cost effect solution.
POP-Click sound suppression
The A2323 embedded with dedicated timing control circuit, present complete the Pop-Click sound
suppressed, effectively erased system power up, power down, power weak and power off operating transient
noise.
REV3.0
- MAY 2013 RELEASED, APR 2016 UPDATED -
- 13 -
AITSEMI [ AiT Semiconductor ]
