audio/videoZONE Products for the week of February 26, 2007

AKM Semiconductor Says . . .
AK5386: High Performance Single-Ended 216 kHz Audio ADC

AKM Semiconductor (AKM), the world's premier supplier of audio ICs for professional and consumer markets, introduced the AK5386, a high performance stereo 216kHz audio A/D converter for professional audio equipment, DVD recorders, A/V receivers and sound-card applications. This latest addition to AKM's Audio4pro* family meets the demanding requirements of both professional and consumer markets.

The AK5386 features single-ended inputs and it is designed for a wide range of applications ranging from consumer recording gear to high-end sound cards. Capable of sampling rates up to 216kHz, it provides the built-in variable pitch functionality required for commercial equipment. The AK5386 has an industry-leading dynamic range of 110dB - meeting the requirements for the most demanding applications. THD+N is specified at 96dB, and the device can operate in master or slave mode.

EN-Genius Says...

AK5386 is the latest in a line of dual-bit delta-sigma stereo ADCs from AKM and is the first to hit a dynamic range of 110 dB. It is pin compatible with the AK5357/58/59 and the AK5381 and offers an SNR also of 110 dB and a SINAD of 96 dB.

The part can be clocked at normal speed (512fs or 768fs) with sampling frequencies of 8 kH to 54 kHz or 8 kHz to 48 kHz; double speed (256fs or 384fs) sampling: 54 kHz to 108 kHz or 48 kHz to 96 kHz; quad speed (128fs or 192fs) sampling: 108 kHz to 216 kHz or 96 kHz to 192 kHz. The clock divider is on-chip. The audio inputs are single-ended, greatly simplifying design, and the digital interface can be either MSB justified or I²S.

The AK5386 requires dual supplies with 4.5 V to 5.5 V for the analog circuits and 2.7 V to 3.6 V for the digital (3.0 V to 3.6 V for fs = 96 kHz - 192 kHz). Quiescent current is a typical 20 mA on the analog and a maximum of 15 mA on the digital -- a power-down mode is available. Interchannel gain mismatch is within 0.1 dB with 115 dB isolation (suggesting there are two dies). Gain drift is a typical 100ppm/°C with PSR at 50 dB.

The decimation low-pass filter has a 0.1 dB passband from 0 kHz to 43.8 kHz (to allow for the 40 kHz bandwidth of double and quad speeds) with the -3 dB point at 90.1 kHz.

To get the kind of published performance that is possible from the AK5386 requires extremely careful attention to grounding, and the location of external digital devices. That said, the AK5386 will be used extensively in new designs of both professional and high-end consumer products in music recording, and the likes of DVD recorders and A/V receivers. Vendors will also upgrade existing applications with the lastest device. It will do extremely well and will continue to cement AKM's leadership role in this area of the market.

The AKM5386 is in production in TSSOP-16 and is priced at $1.71 in 10-k piece lots.
An evaluation board is available.