Tokyo, Japan, Jun 17, 2009 Asahi Kasei Microdevices (AKM) Corporation a leading supplier of audio ICs for professional and consumer markets, today launched the AK4440, a single-supply 2Vrms output 8-channel audio DAC with integrated charge pump. This device is the newest products in the AKM Audio4home™ family, and it is ideal for consumer audio applications including set-top boxes, televisions, DVD/BD players and recorders, and A/V receivers. It is an enhanced 8-channel versions of the AK4420, adding a serial control interface for volume control, interface format selection, and de-emphasis control. Wide dynamic performance is achieved, featuring 106dB SNR and -93dB THD+N.
The AK4440 operates of a +5V nominal power supply. The device contains 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 audio DAC accepts 24-bit data at sampling rates up to 192kHz. A digital de-emphasis filter and soft mute circuit are integrated. 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 (SCF), greatly improving audio performance systems with high clock jitter. The output buffer features a continuous-time filter (CTF). With these two internal filters, only a simple first-order RC external filter is recommended. The AK4440 can be controlled by registers through either a 3-wire or I2 C interface.
To obtain more information, contact Asahi Kasei Microdevices Corporation, Audio Business Operation, 1-105 Kanda Jinbocho, Chiyoda-ku, Tokyo 101-8101, Japan or visit our web site “www.akm.com”.
About Audio4home™
The Audio4home™ 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 Audio4home™ brand product range provides high performance solutions with high quality sound.