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Asahi Kasei Microdevices/AKM AK4958EG
- Part No.:
- AK4958EG
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- Category:
- CODECS
- Package:
- 32-VFBGA
- Datasheet:
-
AK4958EG.pdf
- Description:
- IC STEREO CODEC 24BIT 32BGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,892
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Product details
Overview
AK4958EG from Asahi Kasei Microdevices is a 24-bit stereo audio CODEC with integrated microphone amplifier (+30dB max gain), mono BTL speaker amplifier (400mW @ 8Ω), composite video amplifier (+6/+12/+16.5dB gain), and on-chip 2.3V LDO. It supports I²C and 3-wire serial control, operates from AVDD=2.8–3.6V, and targets portable recording/playback devices with video output capability.
For engineers reviewing the AK4958EG datasheet, AK4958EG pinout, AK4958EG application, or AK4958EG equivalent, this page delivers verified specifications including ADC/DAC performance (S/(N+D): 83–85dB), video output S/N (67dB), speaker output power (400mW), package dimensions (3.5×3.5mm BGA), and I²C/3-wire interface compatibility - all confirmed for the AK4958EG variant specifically.
Technical Context
The AK4958EG integrates dual-path analog front-end processing: a programmable microphone input path with 5-band notch filter, automatic wind noise reduction, and digital ALC (−52.5dB to +36dB range); and a playback path featuring 3-band dynamic range control, bass boost, and stereo separation emphasis. Its PLL supports multiple master clock inputs (11.2896MHz–27MHz) and generates 64fs/128fs/256fs/512fs outputs.
Digital audio interface supports MSB-first 2's complement format with configurable I²S/MSB-justified modes for both 16- and 24-bit data. The video block includes clamping, LPF, and gain-selectable composite output (±0.5dB flatness up to 20kHz), while the LDO supplies internal analog logic at 2.3V with REGFIL pin decoupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit ADC/DAC - enables high-fidelity audio capture and playback with >96dB dynamic range |
| ADC S/(N+D) | 83dB @ MIC-Amp=+18dB - defines usable signal-to-noise-plus-distortion floor for voice recording |
| DAC Line Output | 1Vrms @ AVDD=3.3V - standard line-level output compatible with downstream amplifiers or codecs |
| Speaker Output | 400mW @ 8Ω BTL - sufficient drive for small speakers in portable media players or VoIP handsets |
| Video Gain | +6/+12/+16.5dB - selectable composite video output amplitude matching legacy CVBS display requirements |
| Control Interface | I²C (400kHz Fast-Mode) or 3-wire serial - provides flexible host MCU integration without requiring dedicated audio controllers |
| Operating Temp | −30°C to +85°C - qualified for industrial and extended-temperature portable applications |
Pinout & Package
AK4958EG uses a 32-pin BGA package (3.5mm × 3.5mm, 0.5mm pitch) with four ground planes (VSS1–VSS4) and separate analog/digital/I/O supply domains (AVDD, DVDD, TVDD).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVDD (D5) | Analog Power Supply | 2.8–3.6V supply for ADC, DAC, and analog front-end; requires 0.1μF ceramic decoupling to VSS1 |
| VCOM (D6) | Common Voltage Reference | Bias voltage for ADC inputs and DAC outputs; must be decoupled with 2.2μF capacitor to VSS1 |
| MCKI (E2) | Master Clock Input | Accepts 11.2896/12/13.5/24/27MHz reference for PLL-based sampling rate generation |
| SDTI (C2) | Serial Audio Data Input | Receives 24-bit I²S or MSB-justified PCM data from baseband or application processor |
| LOUT/ROUT (31/32) | Stereo Line Outputs | 1Vrms differential-capable outputs; support 10kΩ load and A-weighted S/N of 92dB |
| SPP/SPN (21/22) | Speaker Amp Outputs | BTL configuration delivering 400mW into 8Ω; S/(N+D) = 20dB at full 400mW output |
| VIN/VOUT (25/24) | Composite Video I/O | Accepts baseband CVBS input; outputs amplified, clamped, filtered composite signal with 67dB S/N |
| PDN (18) | Power-Down Control | Active-low reset/power-down; must be held low during power-up sequence to prevent initialization error |
Key Features
| Feature | Design Value |
|---|---|
| Digital ALC with motor noise reduction | Enables robust voice recording in noisy environments (e.g., handheld recorders) without manual gain adjustment |
| Automatic wind noise reduction filter | Reduces low-frequency turbulence artifacts in outdoor or mobile use cases without degrading speech intelligibility |
| Integrated 2.3V LDO (REGFIL) | Eliminates need for external analog logic regulator, reducing BOM count and PCB area in space-constrained designs |
| 5-band notch filter + stereo separation emphasis | Suppresses narrowband interference (e.g., GSM buzz) while enhancing perceived stereo imaging in playback |
| Composite video amplifier with clamp | Provides direct CVBS output for legacy displays or video encoders without external op-amps or bias circuitry |
Applications
| Portable Voice Recorder | Smart Intercom System |
|---|---|
Use Scenario: Handheld device capturing interviews or field notes with ambient noise suppression. IC Role / Device Role / Timing Role: AK4958EG serves as the sole audio codec, handling mic preamp, ALC, ADC, DAC, speaker drive, and line-out simultaneously. Use Value: Integrated motor noise reduction and wind filter enable clean recordings without external DSP; 400mW speaker output allows loudspeaker playback without added amplifier stage. | Use Scenario: Two-way communication unit in building security or industrial facility with local speaker/mic and remote video feed. IC Role / Device Role / Timing Role: AK4958EG processes bidirectional audio and overlays composite video onto local display or gateway stream. Use Value: Single-chip solution reduces component count vs. discrete audio + video ICs; REGFIL LDO simplifies power tree for mixed-signal subsystem. |
| USB-C Media Dongle | Low-Power IP Camera Audio Module |
Use Scenario: Compact adapter converting USB audio/video to analog line-out and CVBS for legacy monitors. IC Role / Device Role / Timing Role: AK4958EG receives I²S from USB audio controller and outputs stereo line + composite video synchronously. Use Value: 3.5×3.5mm BGA footprint fits tight dongle layouts; I²C control allows host to configure gain, ALC, and video gain dynamically. | Use Scenario: Battery-powered surveillance camera requiring local audio monitoring and alarm playback via built-in speaker. IC Role / Device Role / Timing Role: AK4958EG digitizes mic input, applies ALC for varying sound levels, and drives speaker for audible alerts. Use Value: Ultra-low power-down current (1–5μA) extends battery life; integrated speaker amp eliminates need for Class-D driver IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec with video amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AK4955VN | Lacks video amplifier; smaller 24-pin QFN; no BTL speaker amp (only line-out) | Targeted at pure audio-only portable devices without video output requirement | Select when video functionality is unnecessary and board space is more constrained than feature set |
| WM8978GEFL/V | No video block; 16-bit resolution; lower SNR (94dB DAC); no integrated LDO | Designed for cost-sensitive audio-centric applications like MP3 players or Bluetooth headsets | Choose if system already has dedicated video path and higher-resolution audio is not required |
Compared with AK4958EG, AK4955VN omits video and speaker functions-reducing size but eliminating key multimodal capability-while WM8978GEFL/V trades resolution, integrated power, and video for lower cost and broader vendor support in audio-only systems.
Availability
AK4958EG is available at Aetrix Electronics and suitable for portable voice recorders, smart intercom systems, USB-C media dongles, and low-power IP camera audio modules requiring stable component supply across production lifecycles.
Supply support for AK4958EG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Asahi Kasei Microdevices (AKM) is a Japanese semiconductor company specializing in high-precision analog and mixed-signal ICs for audio, sensor, and power applications.
The AK4958 product line was designed to integrate audio codec, speaker driver, and composite video functions into a single chip for compact portable multimedia devices - reducing bill-of-materials and PCB complexity.
FAQ
What is the maximum output power of the AK4958EG speaker amplifier?
The AK4958EG speaker amplifier delivers 400mW into an 8Ω load in BTL mode at AVDD = 3.3V. This is achieved with SPKG1-0 bits = "10" and −0.85dBFS input. At lower power levels (150mW and 250mW), S/(N+D) improves to 65dB and 60dB respectively, making AK4958EG suitable for applications balancing output level and audio fidelity.
Does the AK4958EG support digital microphones?
Yes, the AK4958EG supports digital microphones via the DMDAT (data) and DMCLK (clock) pins when DMIC bit = "1". It provides programmable gain and filtering for PDM inputs, enabling direct connection to MEMS digital mics without external conversion circuitry - a capability confirmed in the AK4958EG-specific pin function table and register description.
What are the supported sampling frequencies for the AK4958EG?
The AK4958EG supports sampling frequencies from 8kHz to 48kHz. In MCKI Reference PLL Mode, it accepts 11.2896MHz, 12MHz, 13.5MHz, 24MHz, or 27MHz input clocks and generates exact rates including 44.1kHz and 48kHz. In BICK Reference PLL Mode, it supports continuous 8–48kHz; in External Clock Mode, it covers 7.35–48kHz depending on fs multiplication factor (256fs/512fs/1024fs).
How does the AK4958EG handle power sequencing?
The AK4958EG requires PDN to be held low during power-up of AVDD, DVDD, and TVDD. After all supplies stabilize, PDN must be driven high to exit reset. The datasheet states the power-up sequence between AVDD/DVDD/TVDD is non-critical, but PDN timing is mandatory - failure to follow this causes internal circuit errors. This behavior is explicitly defined for AK4958EG in the Recommended Operating Conditions section.
What video standards does the AK4958EG composite output support?
The AK4958EG composite video output supports standard CVBS (Composite Video Blanking and Sync) signals with NTSC/PAL-compatible timing. Its video block includes clamping, LPF, and gain control optimized for 100kHz–6MHz bandwidth, achieving 67dB S/N and <−35dB secondary harmonic distortion at 3.58MHz - meeting baseline analog video fidelity requirements for consumer-grade displays and encoders.
AK4958EG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- Series:
- -
- Package/Case:
- 32-VFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Stereo Audio
- Data Interface:
- Serial
- Resolution (Bits):
- 24 b
- Number of ADCs / DACs:
- 1 / 1
- Sigma Delta:
- No
- S/N Ratio, ADCs / DACs (db) Typ:
- -
- Dynamic Range, ADCs / DACs (db) Typ:
- -
- Voltage - Supply, Analog:
- 2.8V ~ 3.6V
- Voltage - Supply, Digital:
- 1.6V ~ 2V
- Operating Temperature:
- -30°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-BGA (3.5x3.5)
AK4958EG FAQ
1.How can I place an order for AK4958EG through Aetrix?
Please submit a Request for Quotation (RFQ) for AK4958EG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AK4958EG reliable?
The price and inventory of AK4958EG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AK4958EG is usually 5 days.
3.What payment methods are accepted for AK4958EG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AK4958EG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AK4958EG?
AK4958EG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AK4958EG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AK4958EG?
For technical support, including AK4958EG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AK4958EG requirements.
6.How does Aetrix verify that AK4958EG is sourced from the original manufacturer or authorized distributors?
All AK4958EG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AK4958EG meets industry standards.
7.What is the process for return or replacement of AK4958EG?
All AK4958EG units undergo pre-shipment inspection (PSI). If there is an issue with AK4958EG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AK4958EG part is unused and in its original packaging.
Return procedure for AK4958EG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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