AK4385ET
AK4385ET - 24-Bit 192kHz Stereo DAC | AKM
The Asahi Kasei Microdevices/AKM AK4385ET is a 24-bit, 192 kHz, two-channel delta-sigma digital-to-analog converter with a 108 dB dynamic range and an I2S interface, housed in a 16-pin TSSOP package with 0.65 mm pitch. It supports a 5 V supply and operating temperatures from -20°C to +85°C.
A digital-to-analog converter, or DAC, converts digital audio samples into an analog voltage suitable for audio amplification, headphones, speakers, line-level inputs, or digital recording equipment. Within the broader semiconductor hierarchy, the AK4385ET is an audio data-converter IC and a specialized member of the ADC/DAC family. Its two-channel architecture supports stereo audio conversion without requiring two separate external DAC packages.
The principal performance characteristics are 24-bit resolution, a maximum sampling rate of 192 kHz, 108 dB dynamic range, and full differential SCF outputs. The 24-bit interface accommodates high-resolution digital audio data, while the 192 kHz capability supports high-rate studio, mastering, broadcast, and consumer applications. Full differential outputs can also remove the need for AC-coupling capacitors in suitable output networks.
AKM describes the AK4385 as using a multibit modulator architecture to preserve linearity and improve THD+N performance. The I2S interface makes the device suitable for systems that transmit PCM audio data from a digital audio processor, receiver, decoder, or source. The compact 16-pin TSSOP outline supports surface-mount assembly while providing separate connections for the two-channel interface, supplies, clock signals, and analog outputs.
Typical uses include professional digital mixers, multichannel audio processors, high-resolution music players, home-theater equipment, recording interfaces, and digital audio monitoring. In stereo systems, the converter can provide left and right analog outputs from a common digital source. In multichannel equipment, several devices may be used when more than two channels are required, subject to the interface and clock design described in the manufacturer datasheet.
Designers should follow the pin-description table, recommended application circuit, and interface timing diagrams in the AK4385 datasheet before assigning PCB signals. Keep the digital clock and data traces away from the analog outputs, use the specified decoupling arrangement, and observe the required relationship between the audio master clock and the I2S source clock. The differential outputs should use the manufacturer-recommended load and reconstruction network rather than an improvised output stage.
This product page combines the exact AK4385ET specifications, package information, interface characteristics, application guidance, and design cautions needed to evaluate the converter before schematic capture. It also highlights where the datasheet must be consulted for the complete pin map, timing limits, recommended circuit, and electrical-characteristic test conditions.
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