AK5704EN - 4-Channel 32-Bit 192kHz ADC | Asahi Kasei
MPN: AK5704EN ✓ ActiveAK5704EN Overview
An audio ADC is a specialized data-acquisition IC that converts microphone or line-level analog signals into digital samples for transmission, recording, or processing. Within the broader semiconductor hierarchy, the AK5704EN is an analog front end: a microphone amplifier and high-resolution ADC are integrated ahead of a digital audio interface. This combination reduces the number of external analog components and allows captured voice data to be supplied directly to an audio processor through a digital serial interface.
The AK5704EN provides four 32-bit ADC channels, a 192 kHz maximum sampling rate, and I2S-format digital audio output. Its integrated low-noise microphone amplifier is designed to preserve the dynamic range of high-S/N microphones, while low power consumption supports portable and always-listening equipment. The integrated PLL supports systems requiring synchronized digital audio clocks, and voice activity detection can reduce unnecessary processing when no qualifying speech activity is present.
The 28-QFN package consolidates four capture channels, analog conditioning, conversion, clocking, and digital output into a 4 mm by 4 mm footprint. This mixed-signal integration reduces board area, but the exposed-pad package requires careful PCB layout and thermal management. The I2S interface provides a conventional connection to audio codecs, digital signal processors, application processors, and other host devices.
Typical uses include voice-recognition microphones, far-field voice control, conference terminals, smart speakers, hearing-support equipment, and connected microphones. In these systems, the AK5704EN can digitize microphone signals close to the transducer, limiting analog trace length and reducing susceptibility to interference. Its 192 kHz capability also supports high-resolution capture workflows where the host must still perform decimation or sample-rate conversion.
For implementation, follow the manufacturer’s recommended input, clock, power, and exposed-pad layout instructions. Confirm microphone gain, analog input range, clock stability, interface mode, and channel aggregation before PCB release; the supplied web excerpts do not expose the complete electrical limits or pin definitions. Treat the values below as sourced facts and verify all marker-designated details against the current manufacturer datasheet.
This page consolidates the verified manufacturer and distributor findings for the AK5704EN, documents the distinction between confirmed characteristics and unavailable technical details, and explains practical selection, layout, and signal-chain considerations beyond a basic distributor listing. Pricing reflects the observed source value as of 2026-10-28, while lifecycle, compliance, pinout, and detailed electrical conditions should be reconfirmed before production release.
Drop-in alternatives for AK5704EN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
AK5703EN
✅ Drop-In📋 Reference alternative (not in catalog)
AK5704EN Maximum Ratings & Electrical Characteristics
| ADC Resolution | 32 bit |
| Number of ADC Channels | 4 channels |
| Maximum Sampling Rate | 192 kHz |
| Digital Audio Interface | I2S |
| Integrated Microphone Amplifier | Yes |
| Dynamic Range | 105 dB |
| Supported Microphone Configuration | Up to 16 channels |
| Integrated PLL | Yes |
| Voice Activity Detection | Yes |
| Device Classification | Audio A/D converter with microphone amplifier |
| Package | 28-pin QFN, 4 mm x 4 mm |
| Exposed Pad | Yes |
| Mounting Type | Surface mount |
AK5704EN 28-pin qfn, 4 mm x 4 mm Pin Configuration Guide
Pin configuration for AK5704EN (28-pin qfn, 4 mm x 4 mm package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for AK5704EN.
Refer to the datasheet for full pin configuration.
Typical Applications
AK5704EN is suitable for 6 applications: Voice Recognition Microphone Arrays, Far-Field Voice Control, Conference Terminal Microphone Capture, Smart Speaker Microphone Module, Hearing Support and Audio Monitoring, Industrial Acoustic Monitoring.
Voice Recognition Microphone Arrays
The AK5704EN fits voice-recognition arrays because it combines four 32-bit ADC channels, a maximum sampling rate of 192 kHz, and a low-noise microphone amplifier in one 28-QFN device. The manufacturer identifies voice recognition as a primary application and rates dynamic range at 105 dB, helping preserve useful signal detail from high-S/N microphones. Placing conversion close to the transducers can shorten sensitive analog routes, while the I2S interface can feed captured channels to a voice-processing SoC. Integrated PLL and voice activity detection support clocking and event-driven system design, although channel aggregation, gain settings, and latency must be validated against the final microphone topology and host requirements.
Recommended
Far-Field Voice Control
The AK5704EN supports far-field voice-control hardware by combining an integrated microphone amplifier, four 32-bit conversion channels, and voice activity detection. The 105 dB dynamic range is useful when weak speech signals must be retained through capture and digital processing, while the low-noise amplifier avoids requiring a separate analog gain stage immediately beside each microphone. Up to 192 kHz conversion gives the host sufficient raw-data bandwidth for advanced filtering or noise-reduction pipelines. A practical implementation places the AK5704EN near the microphone array, uses I2S to carry digital audio to a voice-control processor, and uses the activity-detection output to reduce unnecessary downstream processing when no qualifying event is present.
Recommended
Conference Terminal Microphone Capture
The AK5704EN is suitable for conference terminals that require several microphone inputs with consistent high-resolution digitization. Four integrated 32-bit ADC channels can capture multiple participants or microphone-array elements, while the 192 kHz maximum rate provides generous conversion bandwidth before host-side filtering. The integrated low-noise microphone amplifier and 105 dB dynamic range are particularly relevant in rooms where speech levels vary and system noise must not dominate the captured signal. The device’s PLL, I2S output, and voice activity detection simplify clocking and event management. Designers should confirm channel combination, microphone bias requirements, analog input range, and host clock configuration in the official datasheet before finalizing the conference front end.
Recommended
Smart Speaker Microphone Module
The AK5704EN can serve as the capture front end in a smart speaker because it integrates microphone amplification, four-channel conversion, PLL functionality, and voice activity detection in a compact 4 mm by 4 mm QFN. This allows a product to digitize one or more microphones without allocating separate amplifiers and ADC channels to every transducer. The 105 dB dynamic range helps preserve recognizable speech characteristics, while 32-bit, 192 kHz-capable conversion provides ample headroom for voice enhancement and machine-learning preprocessing. The I2S result connects to an audio application processor, while activity detection can gate expensive processing during silence. The final module still requires verified microphone bias, gain, clock, layout, and thermal implementation.
Recommended
Hearing Support and Audio Monitoring
The AK5704EN is relevant to hearing-support and connected audio-monitoring products that need accurate microphone capture before amplification or diagnostic processing. Its four 32-bit ADC channels permit multiple transducers or differential signal paths to be digitized consistently, and the 105 dB manufacturer-stated dynamic range supports sensitive speech monitoring. The integrated low-noise microphone amplifier reduces the analog chain immediately around the capture stage, while the I2S interface transfers data to a DSP or processor. Voice activity detection can serve as an additional wake-event indication rather than the sole trigger for clinical decisions. Engineers should verify the supported input topology, maximum input conditions, latency, clocking, and medical-system requirements in the current manufacturer documentation.
Recommended
Industrial Acoustic Monitoring
The AK5704EN can support compact industrial acoustic-monitoring systems that capture machinery, equipment, or ambient sound for classification and diagnostics. Four 32-bit channels allow multiple sensors to share a high-resolution converter, and the 192 kHz maximum rate can capture information needed by spectral or event-analysis algorithms. The integrated microphone amplifier reduces board area, while the I2S output and integrated PLL simplify connection to an embedded processor. Voice activity detection may assist event gating for speech-oriented monitoring, although machine or structural sound detection can require a different trigger strategy. A robust implementation must confirm analog input range, gain, clock accuracy, grounding, EMI exposure, and exposed-pad thermal performance; those details were not included in the supplied excerpts.
Recommended
Recommended Products Summary
Engineering reference data for AK5704EN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AK5703EN |
|---|---|---|
| Package | 28-pin QFN, 4 mm x 4 mm | 28-pin QFN, 4 mm x 4 mm |
| Brand | Asahi Kasei Microdevices | Asahi Kasei Microdevices |
Key Differentiators
- Integrated voice-oriented analog front end (vs AK5703EN)
- High-resolution simultaneous capture capability (vs AK5703EN)
- Compact mixed-signal integration (vs AK5703EN)
Design Notes
Place the AK5704EN close to the microphone inputs to minimize the length of sensitive analog routes. Keep the microphone amplifier and ADC inputs away from switching supplies, digital clocks, and high-current traces. Use a continuous ground reference and follow the manufacturer’s exposed-pad and grounding pattern; the supplied excerpts identify an exposed pad but do not provide the recommended land pattern, so use the official package drawing for manufacturing.
Treat the I2S clock and data lines as a coordinated digital interface. Route them over a continuous reference plane, avoid unnecessary stubs, and match clock/data geometry according to the host-device requirements. Because the AK5704EN includes a PLL and supports 192 kHz conversion, verify master-clock mode, clock ratios, and jitter tolerance with the current datasheet before enabling the highest sampling rate.
Follow the manufacturer’s recommended analog and digital supply arrangement, including local high-frequency decoupling. The supplied search data describes the device as low power but does not provide supply tolerances, quiescent current, or operating current. Do not infer those values from the 32-bit resolution or 192 kHz rate; verify them from the datasheet and confirm capacitor voltage ratings, DC bias characteristics, and regulator transient performance at the intended sampling mode.
Do not treat the presence of an integrated microphone amplifier as permission to use an arbitrary microphone or analog input network. Confirm supported microphone type, bias voltage, input range, gain settings, channel aggregation, and clock configuration in the AK5704EN documentation. The advertised support for configurations up to 16 channels does not by itself define how those channels are formed, so preserve the distinction between the four physical ADC channels and the manufacturer’s broader microphone configuration statement.
Compliance Information
The supplied verified excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because the verified product information describes an audio analog front end rather than an automotive-qualified device.
