Analog Audio Input, Class-D Output with the ADAU1701 SigmaDSP Codec, Low Power SSM2306 Class-D Amplifier, and ADP3336 LDO Regulator (cn0162)
The circuit shown in Figure 1 connects an ADAU1701 codec with an integrated SigmaDSP® core to an SSM2306 2 W stereo Class-D amplifier and an ADP3336 low dropout regulator. The ADAU1701 has two ADCs and four DACs; therefore, it can process a stereo audio signal and output discretely processed signals to both a line-level output and an amplified output. This allows the line and amplified outputs to be processed in the SigmaDSP core with different signal processing, such as custom EQ, compressors tailored to the clip level of the specific output, or spatialization effects tuned to the specific speaker configurations. The ADP3336 generates the 3.3 V supply for the ADAU1701. The SSM2306 is a stereo 2 W Class-D amplifier with ultralow idle current and high efficiency. The amplifier does not require bulky external inductors, but it does require minimal external components and has a small system footprint. The amplifier’s voltage is not supplied from the regulator but rather directly from the 5 V system supply. This system can provide an audio signal processing path output to a low power efficient amplifier for systems such as radios, multimedia docks, or PC speakers.
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