AK4128AEQ

Overview

The AK4128AEQ is an 8-channel asynchronous digital sample rate converter (SRC) by Asahi Kasei Microdevices. It supports input and output sample rates from 8kHz to 216kHz with a conversion ratio range of 1/6 to 6. The device features a THD+N of -130dB and a dynamic range of 140dB (A-weighted). It includes an internal oscillator, eliminating the need for external master clocks, and supports I2S, TDM, MSB/LSB justified interfaces. Powered by 3.0V to 3.6V, it operates within a temperature range of -20°C to 85°C in a 64-LQFP package.

Feature Summary

• 8-channel asynchronous SRC supporting 8kHz to 216kHz input/output rates
• High performance: -130dB THD+N and 140dB dynamic range (A-weighted)
• Internal oscillator removes requirement for external master clocks
• Supports I2S, TDM, MSB/LSB justified formats with individual channel control

Applications

• Multi-channel high-end car audio systems
• DVD recorders
• Digital audio interfacing between different sample rates

Procurement Notes

Verify the specific suffix 'EQ' corresponds to the -20°C to 85°C operating temperature range as defined in the ordering guide. Confirm that the 64-LQFP package dimensions match the design footprint. Ensure power supply sequencing adheres to the recommendation of holding PDN low until all supplies are active.

Selection Notes

Select the AK4128AEQ over the AVQ variant when the application requires operation down to -20°C rather than -40°C. Consider the internal oscillator feature if system clock distribution complexity needs reduction. Verify interface compatibility with I2S or TDM requirements, noting that TDM mode is restricted to synchronous input configurations.

Part Context

The AK4128A series serves as an evolution of the AK4126, adding asynchronous mode support, internal oscillators, and per-channel control capabilities. While the AK4126 is limited to synchronous modes and lacks internal clocking, the AK4128A provides greater flexibility for complex multi-rate audio environments. The AEQ suffix specifically denotes the commercial temperature grade variant within this family.

Replacement Considerations

The AK4128AVQ is the primary alternative, differing only in the extended industrial temperature range (-40°C to 85°C). No other direct cross-model replacements are documented in the provided datasheet.