The ADAU1701 is a complete single-chip audio system that includes a 28/56-bit audio DSP, ADC, DAC, and microcontroller-like control interface. Signal processing includes balance, mixing, bass boost, multi-band dynamic processing, delay compensation, and stereo image expansion to compensate for real-world limitations in speakers, amplifiers, and listening environments, and to dynamically improve perceived audio quality.
The first circuit we introduced below is an analog audio input, Class D output with the ADAU1701 SigmaDSP codec, low-power SSM2306 Class D amplifier, and ADP3336 LDO regulator.
Circuit Function and Benefits The circuit shown in Figure 1 connects an ADAU1701 codec with an integrated SigmaDSP® core to the SSM2306 2W stereo Class D amplifier and the ADP3336 low dropout regulator. The ADAU1701 has two ADCs and four DACs built in, so it can process one stereo audio signal and simultaneously output the separately processed signals to one line-level output and one amplified output. In this way, the line output and the amplified output can be processed in different signal processing modes in the SigmaDSP core, such as custom EQ, a compressor customized at the chip level for a specific output, or a spatialization effect adjusted according to a specific speaker configuration. The ADP3336 generates a 3.3 V supply for use with the ADAU1701. The SSM2306 is an ultra-low idle current and high efficiency 2 W stereo Class D amplifier that does not require bulky external inductors but requires a small amount of external components and a small system size. The amplifier's supply voltage is not supplied by the regulator, but is obtained directly from the 5 V system supply. The system provides an audio signal processing path output for low-power amplifiers for systems such as radios, multimedia docking stations or PC speakers.
Circuit description
The DAC output of the ADAU1701 is connected to the SSM2306 through a resistor and capacitor at each input of the amplifier. A 0.10 μF capacitor in series with a 13.0 kΩ resistor is connected between the output of the ADAU1701 and the SSM2306 input to implement a 28 Hz high-pass filter. These resistors also set the gain of the amplifier to approximately 6 dB. The full-scale output of the ADAU1701 is 0.9 V rms, so the SSM2306 amplifies it to a full-scale 1.8 V rms value (5.09 V pp). When VDD = 5 V of the SSM2306, this full-scale value exactly matches the clamp level of the amplifier.
This circuit utilizes a multipurpose (MP) pin of the ADAU1701 to control the active-low shutdown pin of the SSM2306. This connection, combined with a 10 kΩ pull-up resistor, allows the SigmaDSP program to gracefully disable Class D amplifiers without popping and humming.
Simply place a ferrite bead and a 1.0 nF capacitor on each pin in front of the speaker, and the SSM2306's Class D amplifier output remains stable.
The SSM2306's supply voltage can be obtained directly from a 5 V supply, such as a battery, but the ADAU1701 requires a 3.3 V regulated supply, which is generated by the ADP3336. The output voltage of the ADP3336 is set to 3.3 V through a 140 kΩ and 78.7 kΩ feedback resistor. By placing a capacitor as low as 1.0 μF between the output pin and ground, the regulator output remains stable. A 1.0 μF capacitor at the regulator input is used to decouple the stray inductance between the board and the 5 V supply. In this circuit, the regulator's shutdown pin only needs to be connected to the input voltage, so the IC will be enabled when there is an input voltage.
Common changes
In addition to the ADAU1701, this circuit can also be configured with other SigmaDSP processors with integrated DACs, such as the ADAU1761. The ADAU1702 can also replace the ADAU1701, the only difference between which is the SigmaDSP program and data memory size. Class D amplifiers SSM2301, SSM2302, and SSM2304 are slightly different from the SSM2306 used in this design. The audio inputs of these three amplifiers do not require an external resistor to set the gain. The SSM2301 is a mono amplifier, not a stereo amplifier.
Digital audio system solution based on ADAU1701 and ARM7
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