AK4137EQ - 2-Channel 32-Bit 768kHz Audio SRC | AKM
MPN: AK4137EQ ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
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| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
AK4137EQ Overview
A digital sample rate converter is an interface IC that resamples or changes the clock rate of digital audio data between incompatible source and destination rates. The AK4137EQ includes an internal oscillator, so it does not require an external master clock for its asynchronous conversion operation. This simplifies system configuration when the source and destination audio domains use unrelated clocks.
Key features include two-channel operation, 32-bit sample processing, asynchronous conversion, input and output rates spanning 8kHz to 768kHz, and PCM-DSD data conversion. The internal oscillator reduces external clock infrastructure, while the broad sample-rate range supports professional audio, USB-DAC, and multirate digital-audio designs. The device is supplied in a 48-LQFP package identified by DigiKey as 48-LQFP (7x7).
The AK4137EQ is intended for applications where audio data arrives from a source clock domain and must be delivered to a DAC, decoder, recorder, or other digital-audio subsystem operating at another rate. Its sample-rate flexibility makes it useful for format bridging, asynchronous playback paths, and PCM-to-DSD or DSD-to-PCM conversion as described by the manufacturer.
Designers should verify the complete pinout, interface logic, clock requirements, supported audio formats, control signaling, and electrical limits against the manufacturer datasheet before layout or firmware implementation. The available verified sources do not provide complete pricing, pin-level assignments, or detailed timing tables, so those values remain data-needed rather than inferred.
Drop-in alternatives for AK4137EQ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesAK4137EQ Specifications
| Product Type | 2-channel digital sample rate converter |
| Channel Count | 2 channels |
| Sample Processing | 32-bit |
| Input Sample Rate | 8kHz to 768kHz |
| Output Sample Rate | 8kHz to 768kHz |
| Conversion Type | Asynchronous sample rate conversion |
| Internal Oscillator | Yes |
| External Master Clock | Not required for asynchronous operation according to verified description |
| PCM-DSD Conversion | Supported |
| Package | 48-LQFP (7x7 mm) |
| Mounting Type | Surface mount |
| Operating Temperature | -40C to +105C |
| Application Category | Digital audio interfacing |
| Function | Sample rate converter |
| Pin Count | 48 pins |
| RoHS Status | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
AK4137EQ 48-lqfp (7x7 mm) Pin Configuration Guide
Pin configuration for AK4137EQ (48-lqfp (7x7 mm) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for AK4137EQ.
Refer to the datasheet for full pin configuration.
Typical Applications
AK4137EQ is suitable for 6 applications: USB-DAC Audio Path, High-End Audio System, Asynchronous Audio Playback, PCM-to-DSD and DSD-to-PCM Conversion, Digital Audio Interface Bridging, Professional Audio Monitoring.
USB-DAC Audio Path
The AK4137EQ fits a USB-DAC signal chain because it is explicitly identified by Asahi Kasei Microdevices as suitable for USB-DAC applications. Its two-channel asynchronous sample-rate conversion handles audio domains whose source and destination rates differ, while the 8kHz-to-768kHz range covers high-resolution playback formats. The internal oscillator simplifies systems that would otherwise need additional master-clock infrastructure. Firmware and hardware integration still require validation of USB audio format, interface timing, clocking, and supported PCM-DSD operating modes.
Recommended
High-End Audio System
The AK4137EQ is suitable for high-end audio systems that need flexible sample-rate interfacing. Its two-channel architecture supports conversion between incompatible audio rates from 8kHz to 768kHz, allowing source, transport, and DAC stages to operate independently. The internal oscillator reduces the need for a shared master clock in asynchronous arrangements. For premium playback equipment, the key engineering checks are supported data format, clock stability, digital interface configuration, and the converter’s documented mode restrictions.
Recommended
Asynchronous Audio Playback
The AK4137EQ is well suited to asynchronous playback because it performs two-channel sample-rate conversion and contains an internal oscillator. This architecture can decouple a digital source clock from the DAC-side rate, avoiding dependence on an external master clock for the asynchronous operating mode described by the manufacturer. The converter supports rates up to 768kHz, making it relevant to high-resolution playback chains. System designers must still confirm the exact asynchronous modes, latency behavior, control registers, and supported data formats in the datasheet.
Recommended
PCM-to-DSD and DSD-to-PCM Conversion
The AK4137EQ supports PCM-DSD data conversion according to the verified Asahi Kasei Microdevices product page. This makes it relevant to digital-audio products that need to bridge PCM playback data and DSD workflows rather than merely change the numerical sample rate. Its 2-channel format and 8kHz-to-768kHz operating span provide a broad conversion foundation. Before using it in a DSD product, verify the exact supported DSD rates, data mapping, filter configuration, clock requirements, and output format in the complete manufacturer datasheet.
Recommended
Digital Audio Interface Bridging
The AK4137EQ can bridge digital-audio blocks operating at different sample rates, reducing the need to force every subsystem onto one clock domain. Its two-channel asynchronous SRC and broad 8kHz-to-768kHz range are useful when connecting sources, transports, converters, and recording or playback stages. The internal oscillator simplifies clock architecture, but integration still depends on supported interface formats and control signaling. Layout should preserve clean digital return paths and follow the manufacturer’s recommended decoupling and clock guidance.
Recommended
Professional Audio Monitoring
The AK4137EQ is applicable to professional audio monitoring systems that receive digital streams at one rate and deliver them to another processing or DAC stage. Its two-channel converter architecture supports stereo conversion, and the 32-bit processing specification is useful for high-resolution audio paths. The internal oscillator can simplify isolated digital domains, while the broad rate range supports multiple standard and high-resolution rates. Designers should verify converter mode restrictions, latency, clock jitter behavior, and the exact supported digital audio formats before production use.
Recommended
Recommended Products Summary
Engineering reference data for AK4137EQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 48-LQFP (7x7 mm) |
| Brand | Asahi Kasei Microdevices |
| Channel Count | 2 channels |
| Sample Processing | 32-bit |
| Input Sample Rate | 8kHz to 768kHz |
| Output Sample Rate | 8kHz to 768kHz |
| Conversion Mode | Asynchronous sample rate conversion |
| Internal Oscillator | Yes |
| PCM-DSD Conversion | Supported |
| Operating Temperature | -40C to +105C |
Key Differentiators
- Integrated asynchronous conversion and clock support (vs Generic digital sample-rate converter)
- PCM-DSD conversion capability (vs AK4113VF)
- High-resolution two-channel audio positioning (vs Generic audio interface IC)
Design Notes
Confirm the AK4137EQ supply voltage, sequencing requirements, and decoupling recommendations from the manufacturer datasheet before laying out the board. The verified excerpts establish the package and signal-processing role but do not provide the complete electrical limits. Place required bypass capacitors close to the relevant supply pins, maintain short return paths, and avoid routing noisy digital or power signals beneath sensitive audio-clock and data nets.
Treat the AK4137EQ as a high-speed digital and clock-sensitive audio interface. Use a continuous ground reference where practical, keep clock traces short and controlled, and route data signals away from switching-power nodes and inductors. The verified data identifies asynchronous operation and an internal oscillator, but it does not provide the complete recommended layout; follow the manufacturer’s pin and reference-circuit guidance for final impedance, topology, and keepout details.
Do not assume that a converter advertising a similar maximum sample rate is a drop-in replacement. A valid replacement must match the 48-LQFP footprint, pin functions, interface voltage, supported data format, clock architecture, and PCM-DSD behavior. The supplied cross-reference search found no verified same-package substitute, so engineering validation is required before replacing AK4137EQ in an existing design.
Compliance Information
The provided manufacturer and distributor excerpts do not state RoHS, REACH, halogen-free, lead-free, or conflict-minerals status. Verify these attributes with the manufacturer or authorized distributor documentation.
