AK4121VF

Overview

The AK4121VF is a stereo asynchronous sample rate converter manufactured by Asahi Kasei Microdevices. It converts input sample rates ranging from 8kHz to 96kHz to output rates of 32kHz, 44.1kHz, 48kHz, or 96kHz. The device supports I2S and MSB/LSB justified formats with resolutions up to 20 bits. Key electrical parameters include a THD+N of -113dB, a dynamic range of 117dB (A-weighted), and a group delay of 57.5/fs. It operates on a 3.0V to 3.6V core supply and a 3.0V to 5.5V input buffer supply within an operating temperature range of –40°C to +85°C.

Feature Summary

• Stereo asynchronous sample rate conversion with FSI/FSO ratios between 0.33 and 6
• Internal PLL eliminates master clock requirement in slave mode
• Supports 16-bit, 20-bit, and 24-bit data formats including I2S and MSB/LSB justified
• Integrated de-emphasis filter for 32kHz, 44.1kHz, and 48kHz sampling rates

Applications

• Car audio systems
• DVD recorders
• Digital audio recording equipment

Procurement Notes

Verify the component status as discontinued or obsolete through official manufacturer channels or authorized distributors before procurement planning. Confirm availability of the 24-VSOP package variant specifically. Ensure compliance with RoHS3 specifications if required by the target application environment.

Selection Notes

Select this model when system design requires asynchronous conversion between standard audio rates without external master clocks in slave configurations. Ensure the input interface supports the required 16/20/24-bit word lengths. Verify that the TVDD pin can accommodate the input voltage levels of the source device, as it supports up to 5.5V tolerance.

Part Context

The AK4121VF belongs to the AK4121 series of digital audio interfaces. It serves as a successor to the AK4120, adding support for higher input sample rates up to 96kHz, 5V tolerant inputs, and integrated de-emphasis filtering. The 'VF' suffix denotes the specific 24-pin VSOP surface-mount package configuration.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer's current product portfolio for updated alternatives.