AK4125VF

Overview

The AK4125VF is a stereo asynchronous digital sample rate converter (SRC) designed for high-performance audio applications. It converts input sampling rates ranging from 8kHz to 216kHz to output rates within the same range, supporting ratios from 1/6 to 6. The device features a built-in PLL for internal clock generation, eliminating the need for master clocks in slave mode. Key electrical specifications include a THD+N of -130dB and a dynamic range of 140dB (A-weighted). It operates on a single 3.0V to 3.6V supply and supports I2S, MSB justified, and LSB justified interfaces.

Feature Summary

• Asynchronous Sample Rate Converter with input/output ranges of 8kHz to 216kHz
• High performance metrics: -130dB THD+N and 140dB dynamic range (A-weighted)
• Built-in PLL allows slave mode operation without external master clock
• Supports MSB justified, LSB justified, and I2S compatible audio interfaces

Applications

• Digital audio interfacing between devices with different sample rates
• Studio equipment requiring precise sample rate conversion
• High-end car audio systems and DVD recorders

Procurement Notes

Verify the package type is 30-VSOP (0.65mm pitch) and the suffix VF indicates the -40°C to +85°C operating temperature range. Confirm that AVDD and DVDD are supplied within the 3.0V to 3.6V specification. Ensure unused digital input pins are tied to DVSS to prevent floating states during operation.

Selection Notes

Select the AK4125VF when an asynchronous SRC is required for stereo digital audio streams up to 216kHz. It is suitable for designs needing pin compatibility with the AK4124 but requiring extended frequency support. Consider the built-in PLL capabilities if minimizing external clock components in slave mode configurations is a priority.

Part Context

The AK4125VF is part of Asahi Kasei Microdevices' digital audio interface family. It serves as a direct pin-compatible upgrade to the AK4124, offering broader sample rate conversion capabilities. The evaluation board for this component is designated as AKD4125.

Replacement Considerations

The AK4124 is a pin-compatible alternative. Note that the AK4124 has a narrower digital filter passband compared to the AK4125VF; verify filter characteristics if replacing across these models.