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当前位置：AK4420 - Single-supply audio DAC's feature ground-referenced 2Vrms outputs
Tokyo, Japan, December 5, 2007 Asahi Kasei EMD Corporation (AKEMD), a leading supplier of audio ICs for professional and consumer markets, today launched the AK4420 and AK4421, single-supply stereo audio 2Vrms output DAC's with integrated charge pumps. These devices are the newest products under the AKM Audio4home™ family, and they are ideal for consumer audio applications including set-top boxes, televisions, DVD players and recorders, and A/V receivers. The high integration level greatly reduces external component requirements, simplifying system design and reducing cost.
The AK4420 operates of a +5V nominal power supply, while the AK4421 operates on +3.3V. The devices contain an integrated charge pump, which supplies the negative rail for the output buffer. Since the output buffer operates off of an internal dual-rail supply, the output signal is ground-referenced, and audible pop noise is suppressed without any external mute circuits on power-up or when clocks are stopped. The output signal is 2Vrms, centered around ground.
The stereo audio DAC accepts 24-bit data at sampling rates up to 192kHz. Dynamic range is 105dB, and THD+N is -92dB. An automatic power-on reset circuit eliminates the need to reset the DAC on power-up or after the clocks are stopped. The DAC includes a switched-capacitor filter, greatly improving audio performance is systems with high clock jitter. The output buffer features a continuous-time filter. With these two internal filters, a simple first-order RC external filter is all that is recommended.
The AK4420/21 is housed in a space-saving 16-pin TSSOP package. No external controller is needed to set the data interface format or the audio sampling rate. The AK4420 is now in mass production, and samples are available for the AK4421. To obtain more information, contact AKEMD, Audio Business Operation, Nishi-Shinjuku 1-23-7, Shinjuku-ku, Tokyo 160-0023, Japan.About Audio4homeTM
The Audio4homeTM brand identifies AKM consumer audio products designed for applications including A/V receivers, set-top boxes, speaker systems, digital video systems, digital televisions and in-vehicle entertainment. The Audio4homeTM brand product range provides high performance solutions with high quality sound.
About AKM TM
AKM TM is the brand name of Asahi Kasei EMD Corporation's LSI's.
