Asahi Kasei Microdevices/AKM AK5522VN

Overview

AK5522VN from Asahi Kasei Microdevices (AKM) is a 32-bit stereo delta-sigma analog-to-digital converter optimized for high-fidelity line/microphone input in USB audio interfaces, wireless speakers, and automotive infotainment systems. It delivers 108dB dynamic range, 98dB S/(N+D), and supports sampling rates from 8kHz to 192kHz with four selectable digital filter modes including short-delay slow-roll-off (4.4/fs group delay).

For engineers reviewing the AK5522VN datasheet, AK5522VN pinout, AK5522VN application, or AK5522VN equivalent, this page provides verified technical context on its integrated low-jitter PLL clock generation, 3.3V DAC power regulator, PSRR/CMRR performance under noisy supply conditions, and dual control mode (parallel/I²C) configuration.

Technical Context

The AK5522VN implements a multi-stage delta-sigma modulator architecture with decimation filtering, digital high-pass filtering (HPF), and programmable gain amplification (−3dB to +12dB). Its internal PLL synthesizes master clock (MCLK) from LRCK or BICK, eliminating external high-frequency clock routing to reduce EMI.

It features dual power domains: analog (4.5–5.5V or 3.0–3.6V) and digital (3.0–3.6V or 1.7–1.98V), with an integrated regulator (REGAO) delivering stable 3.3V for external DACs when AVDD = 4.5–5.5V, and REGDO providing 1.8V for DVDD = 3.0–3.6V operation.

Key Specifications

Pinout & Package

AK5522VN is housed in a 24-pin QFN package (4mm × 4mm, 0.5mm pitch) with exposed thermal pad. Pin functions are validated per AKM's official datasheet Rev. E-00 (2017), supporting differential, pseudo-differential, and single-ended input configurations.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AK5522VN, AK5524VN offers measurable DR/SNR uplift with zero hardware change, while CS5361-KZZ trades integration for lower BOM cost but demands external clocking infrastructure and delivers 3–4dB lower dynamic range - making it less suitable for USB-powered or automotive environments.

Availability

AK5522VN is available at Aetrix Electronics and suitable for USB audio interfaces, wireless speaker systems, automotive infotainment units, and professional audio mixers requiring stable component supply across long production lifecycles.

Supply support for AK5522VN 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 AK5522VN belongs to AKM's premium audio ADC product line, designed specifically for noise-immune, low-latency digitization in power-constrained and EMI-sensitive environments such as portable and automotive audio systems.

FAQ

What is the maximum sampling rate supported by the AK5522VN?

The AK5522VN supports sampling rates from 8kHz up to 192kHz, validated across all operating conditions and filter modes. At 192kHz, it maintains 97dB S/(N+D) and 98dB dynamic range (A-weighted, −60dBFS) with appropriate analog input conditioning and power supply decoupling per the datasheet guidelines. This makes AK5522VN suitable for high-resolution audio recording and playback applications requiring wide bandwidth fidelity.

Does the AK5522VN require an external crystal oscillator?

No, the AK5522VN does not require an external crystal oscillator. Its integrated low-jitter PLL generates the master clock (MCLK) from either the LRCK or BICK signal, enabling fully clock-autonomous operation. This eliminates board-level high-frequency clock routing, reduces EMI, and simplifies BOM - a key advantage in compact USB audio and wireless speaker designs where AK5522VN is commonly deployed.

Can the AK5522VN power an external DAC directly?

Yes, the AK5522VN can directly power an external DAC using its integrated REGAO regulator, which delivers a stable 3.3V output (typ.) when AVDD is supplied at 4.5–5.5V. Per the datasheet, REGAO must be decoupled with a 10μF + 0.1μF capacitor network to the DAC's power pin. This capability is explicitly validated with AKM's AK4432 and AK4452 DACs, allowing AK5522VN to form a low-noise, tightly coupled ADC-DAC pair without external LDOs.

What are the power supply requirements for the AK5522VN?

The AK5522VN requires separate analog and digital supplies: AVDD = 4.5–5.5V or 3.0–3.6V; DVDD = 3.0–3.6V or 1.7–1.98V. When DVDD is 1.7–1.98V, it must be connected to the REGDO pin. Total power consumption is 76mW at AVDD=5.0V, DVDD=3.3V, fs=48kHz. The device's 80dB PSRR allows robust operation directly from noisy USB VBUS or DC-DC converter outputs - a core design intent reflected in AK5522VN's target applications.

How does the AK5522VN handle unused pins?

Per the AK5522VN datasheet, unused analog pins (LINP/LINN/RINP/RINN, LOOP, REGAO under disable condition) should be left open; unused digital pins (CKS1, CKS0, SD, DIF in serial mode, TDMI in non-TDM mode) must be tied to DVSS. MCLK in PLL Slave mode may be left open. Floating digital inputs are prohibited - all digital input pins must be actively driven or pulled to DVSS/DVDD. This pin-handling guidance ensures signal integrity and prevents unintended current paths that could degrade AK5522VN's PSRR or CMRR performance.