High Efficiency, Low Noise, Constant Large Volume, Multi-Level AGC 8 th -Generation Class K Audio Amplifier

AW87328 is specifically designed to enhance overall sound quality. It is an upgrading 8 th -generation class K audio amplifier with high efficiency, low noise, ultra-low distortion and capability of outputting constant large volume. With integrated AWINIC proprietary Multi-Level AGC audio algorithm, AW87328 can eliminate noise in playback and improve sound quality and effect. Using a novel K-Chargepump technology, its integrated charge pump efficiency can reach 93%, and power amplifier’s overall efficiency can reach 83%. With high efficiency, AW87328 can greatly prolong smart phone usage time. AW87328 noise floor is as low as to 43μV, with 98.8dB high  signal-to-noise-ratio  (SNR).  The  ultra-low distortion  0.008%  brings  high-quality  musical enjoyment. AW87328 has a setting of 7-step selectable speaker- guard output power level from 0.6W to 1.2W, suitable for different rated power speakers. Within lithium battery voltage range, it keeps output power constant, preventing voice from degrading. AW87328 supports speaker and receiver two-in-one application. The Class AB Receiver Mode has an ultra- low output noise of 11μV and an ultra-high power supply noise suppression of -100dB@217Hz.


l  Multi-Level AGC audio algorithm, effectively eliminates noise and makes sound smooth

l  Speaker and Receiver two-in-one application

n  Class AB Receiver Mode: 1V/V, Vn=11μV, THD+N=0.15%

n  Class K Speaker Mode: 8V/V, Vn=43μV, THD+N=0.008%

l  Power Amplifier's Overall Efficiency is up to 83%

l  High PSRR: -100dB@217Hz

l  Selectable Speaker-Guard Power Level: 0.6W, 0.7W, 0.8W, 0.9W, 1.0W, 1.1W, 1.2W

l  Within Lithium Battery Voltage Range, Outputs Constant Large Volume

l  Support 6Ω Speaker

l  Upgrade for AW87318

l  Super TDD-Noise Suppression

l  Excellent Pop-Click Suppression

l  One-Wire Pulse Control

l  ESD Protection: ±6kV (HBM)

l  Small 1.575mm×1.575mm, 0.4mm Pitch CSP-14 Package


Application note

Product name Type Size Download
AW87328CSR PDF 1.8M
  • Voltage(V)
    Boost Type
    R=8Ω THD=1%
    Package (mm)
  • AW87328CSR

    K-Chargepump (inductor free)
    WLCSP 1.575X1.575-14B
  • AW87349CSR

    DO-Chargepump (inductor free)
    WLCSP 2.55X2.08-18B
  • AW87318CSR

    K-Chargepump (inductor free)
    WLCSP 1.6X1.68-14B
Package form Number of pins Long(mm) Width(mm) Thick(mm) Pin spacing(mm) Heat sink Package drawing
WLCSP 1.575×1.575×0.575 -14B 14 1.575 1.575 0.575 0.4 N
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