Low Power 24-Bit DAC with HP/SPK-Amp

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The AK4373 is a low power stereo 24bit DAC with an integrated stereo headphone amplifier and a monaural speaker driver. It can be used for a variety of portable audio and media player applications, including game consoles, dedicated headphone drivers, personal navigation devices, and portable media players. The output drivers can be configured for three unique use cases: mono speaker driver or single-ended ac-coupled headphones which can be used as stereo line-out, DC-coupled BTL headphones and Pseudo Cap-less. The AK4373 operates off of a low-voltage power supply, ranging from 2.2V to 3.6V. The output amplifiers operate at up to 4.0V of the headphone power supply. The device is packaged in a space-saving 32-pin QFN package.

Key Features

• Sampling Rate: 8 kHz to 48 kHz

• 8-times Over sampling Digital Filter

• SCF with high tolerance to clock jitter

• Stereo Headphone Amplifier

65mW output (Single-ended mode) into 16Ω 3.3V

SNR: 96dB

130mW output (Differential mode) into 32Ω 3.3V

SNR: 96dB

60mW output (Pseudo cap-less mode) into 16Ω 3.3V

SNR: 86dB

Pop-noise free at power-up and reset

• Stereo Lineout

SNR: 96dB

• Mono Speaker Driver

Available for both Dynamic and Piezo Speaker

0.8W @ 8Ω HVDD = 4.0V

1.0W @ 4Ω HVDD = 4.0V

SNR: 97dB

• Digital Processing

HPF, LPF, 3D Enhance, Frequency Compensation, 5-BiQuads,

Digital ALC/Limiter: +36dB to -54dB, 0.375dB/step

• Digital Volume Control: +12dB to -115dB, 0.5dB/step, Mute

• Analog Mixing: Mono input

• PLL: Input Frequency: 27MHz, 25MHz, 24MHz, 13.5MHz, 12.288MHz, 12MHz, and 11.2896MHz (MCKI pin)

1fs (LRCK pin)

32fs or 64fs (BICK pin)

Input Level: CMOS or AC coupling Input

• Master Clock (MCKI pin): 256/512/1024fs

• Master Clock Output (MCKO pin): 32fs, 64fs, 128fs, 256fs

• µP Interface: 3-Wire serial, I2C bus (version1.0, 400 KHz Fast-mode)

• Audio Interface Format: MSB First, 2’s complement

16/20/24bit MSB justified, 16/20/24bit LSB justified,

16/20/24bit I2S, 16/20/24bit DSP Mode

• CMOS Input Level

• Power Supply:

Analog (AVDD): 2.2 to 3.6V

Digital (DVDD): 1.6 to 3.6V

Driver (HVDD): 2.2 to 4.0V

• Power Consumption:

11.9mW headphone playback

• Ta = -30 to +85°C

• Package: 32-pin QFN (5mm x 5mm, 0.5mm pitch)

• Pin/Register compatible with AK4343

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Block Diagram

Block Diagram

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