Asahi Kasei Microdevices/AKM AK4141EQ

Overview

AK4141EQ from Asahi Kasei Microdevices (AKM) is a multi-standard digital stereo decoder IC optimized for Digital TV and DVR audio systems. It performs NICAM/A2/EIA-J stereo decoding with alignment-free digital architecture, integrates dual-channel 5-band equalizers, automatic level control (ALC), and an asynchronous sample rate converter (SRC) supporting 8–192 kHz input and 32/44.1/48 kHz output rates. Its integrated crystal oscillator, I²C control interface, and 48-pin LQFP package enable compact, high-fidelity broadcast audio processing.

For engineers reviewing the AK4141EQ datasheet, AK4141EQ pinout, AK4141EQ application, or AK4141EQ equivalent, this page delivers verified technical context-including stereo decoding standard support (NICAM B/G/L/I/DK, A2 D/K1–3/M/N, EIA-J), SRC performance (−100 dB THD+N, 115 dB dynamic range), audio interface flexibility (I²S/TDM/MSB/LSB-justified, 5 inputs × 3 outputs), and power domain separation (AVDD=3.3 V, DVDD=1.8 V, TVDD=1.7–3.6 V).

Technical Context

The AK4141EQ implements a fully digital stereo decoding pipeline with FM demodulation, AGC (100 mVpp–1 Vpp SIF input), and auto-detection of NICAM/A2/EIA-J standards via SIF1/SIF2 inputs and programmable A4M5[2:0]/A6M5 pins. Its dual-path audio processing supports independent ALC, balance, 5-band EQ, and stereo separation emphasis per channel.

The integrated asynchronous SRC operates across 8–192 kHz input rates with selectable fso/fsi ratios (1/6 to 6), delivering 20-bit resolution and configurable filter characteristics (passband ripple ±0.01 dB, stopband attenuation ≥94.4 dB). Audio data routing is managed through a flexible switch matrix supporting up to five I²S/TDM inputs and three outputs, all synchronized via master/slave LRCK/SCLK modes and controlled via I²C.

Key Specifications

Pinout & Package

AK4141EQ is housed in a 48-pin LQFP package (0.5 mm pitch) with exposed thermal pad (not electrically connected). Pin functions are validated per AKM MS0952-E-03 datasheet Rev. 03 (2013), including dedicated SIF1/SIF2 analog inputs, PLL loop filter pins (FILT1/FILT2), crystal oscillator terminals (XTI/XTO), and dual-domain power pins (AVDD1/AVDD2, DVDD, TVDD).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo decoder applications.

Compared with AK4142EQ and CS495314-CZZ, the AK4141EQ delivers certified, zero-calibration NICAM/A2/EIA-J decoding in a lower-cost, lower-power package-making it the preferred choice for high-volume broadcast audio subsystems where standard compliance and production stability are critical.

Availability

AK4141EQ is available at Aetrix Electronics and suitable for Digital TV receivers, DVR audio subsystems, and broadcast monitoring equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AK4141EQ 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 AK4141EQ belongs to AKM's broadcast audio decoder product line, designed specifically to replace discrete analog demodulator chains in digital television platforms with a single, digitally aligned, multi-standard solution.

FAQ

What broadcast audio standards does the AK4141EQ support?

The AK4141EQ supports NICAM (B/G/L/I/DK), A2 (B/G/D/K1–3/M/N), and EIA-J stereo decoding standards. It automatically detects and selects the appropriate standard based on SIF input characteristics and A4M5/A6M5 pin configurations. All decoding is performed digitally-no external alignment or analog tuning is required. This makes the AK4141EQ suitable for global Digital TV designs that must comply with regional broadcast specifications without hardware modification.

Does the AK4141EQ require an external crystal oscillator?

No, the AK4141EQ integrates an on-chip crystal oscillator and supports direct connection of a 256fs/384fs/512fs/768fs/1024fs reference crystal via XTI/XTO pins. The datasheet confirms operation with no external oscillator circuit needed-only two external load capacitors (if using crystal) or none (if using external MCLKI). This eliminates BOM items and layout area typically required for discrete clock generation, simplifying design for space-constrained TV mainboards.

How many audio input and output channels does the AK4141EQ provide?

The AK4141EQ provides five independent audio serial data inputs (SDTI1–5) and three outputs (SDTO1–3), each configurable for I²S, TDM, MSB-justified, or LSB-justified formats. Two inputs (SDTI4/5) feed the asynchronous SRC, while SDTI1–3 route directly to the decoder/audio processing block. This architecture allows concurrent handling of tuner audio, secondary sources (e.g., HDMI ARC), and processed outputs to DACs or audio amplifiers-all within a single AK4141EQ device.

What is the function of the PDN pin on the AK4141EQ?

The PDN (Power-Down) pin on the AK4141EQ serves as both a hardware reset and power-down control. When pulled low, it resets all internal registers, forces all digital outputs (SDTOx, TXOUT, MCLKO, INT) to logic low, and places analog blocks in Hi-Z state. The AK4141EQ must be initialized with PDN asserted at power-up before releasing it. This ensures deterministic startup behavior and prevents spurious outputs during voltage ramp-critical for preventing audio pop/noise in consumer TV systems.

Can the AK4141EQ perform sample rate conversion between different audio sources?

Yes, the AK4141EQ includes a fully asynchronous sample rate converter (SRC) supporting input rates from 8 kHz to 192 kHz and output rates of 32/44.1/48 kHz. It achieves −100 dB THD+N and 115 dB dynamic range, with configurable filter characteristics (passband ripple ±0.01 dB, stopband attenuation ≥94.4 dB). This allows seamless bridging of mismatched clocks-e.g., connecting a 44.1 kHz digital tuner to a 48 kHz DAC-without external resampling ICs or DSP intervention.