AK4490EN - 32-Bit 2ch Audio DAC, 768kHz DSD | Asahi Kasei Microdevices
MPN： AK4490EN ✓ 啟用中AK4490EN 概覽
A DAC (digital-to-analog converter) is a mixed-signal semiconductor that reconstructs a continuous analog voltage from a digital audio stream. The broader hierarchy runs DAC -> audio data converter -> ADC/DAC converter -> mixed-signal integrated circuit -> semiconductor. The AK4490EN implements a multi-bit delta-sigma architecture, a topology favored in premium audio because it pushes quantization noise far out of the audio band, leaving the in-band noise floor extremely low compared with basic 1-bit sigma-delta designs.
Key features include native 32-bit word length, dual-channel simultaneous conversion, DSD256 (768 kHz) decoding capability, and an I2S-compatible serial interface that accepts PCM data at high clock rates. The device is a fully differential architecture with an exposed pad that must be soldered to a ground plane to carry heat away and to provide a low-impedance return for the output stage. Its surface-mount footprint keeps board area small for compact desktop and portable audio products.
Technically, the AK4490EN combines a high-speed delta-sigma modulator stage with a multi-bit DAC core and an analog output filter, giving the low distortion and wide dynamic range that characterize AKM's premium 32-bit 2ch DAC family. The 48-QFN package with a thermal pad keeps junction temperature rise low when driving line-level outputs into the usual 10 kohm-plus loads of audio preamplifiers and active stages.
Typical applications include high-end USB and network DAC boards, CD player and streamer digital stages, professional studio monitor digital crossovers, television and set-top box audio, and portable hi-fi headphone DAC dongles. In each case the converter sits between an I2S digital source and an analog output stage, so clocking and layout discipline translate directly into final sound quality.
One critical design consideration is that DSD and PCM paths require different filter configurations; use the manufacturer datasheet tables for sampling-rate, MCLK ratio and filter-mode settings rather than assuming values. A second is that the exposed pad must be tied to a solid ground plane, and the analog output routing should be kept short and symmetric to minimize channel skew and distortion.
This page consolidates device specifications, drop-in alternatives with quantified differences, application guidance and practical design notes, giving engineers a single reference for the AK4490EN before committing to a layout.
直接替換替代品，適用於 AK4490EN — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AK4490EN （相同外形與佔位） — 差異在於 Package.
AK4490EQ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AK4490VN
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AK4490EN 最大額定值與電氣特性
| Device Type | Stereo audio DAC (digital-to-analog converter) |
| 解析度 | 32 bit |
| 通道數 | 2 (dual-channel) |
| Architecture | Delta-sigma |
| Maximum DSD Rate | 768 kHz (DSD256) |
| Digital Audio Interface | I2S |
| 封裝 | 48-QFN (6 x 6 mm) with exposed pad |
| 腳位數 | 48 pins |
| 安裝類型 | Surface Mount |
| Product Class | Premium 32-bit 2ch DAC |
AK4490EN 48-qfn (6 x 6 mm) with exposed pad 腳位配置指南
AK4490EN（48-qfn (6 x 6 mm) with exposed pad 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： AK4490EN.
請參閱 資料表 以查看完整腳位配置。
典型應用
AK4490EN 適用於 6 應用s: High-End USB and Network DAC, Professional Studio Monitor Digital Stage, CD Player and Digital Transport, Portable Hi-Fi Headphone DAC Dongle, Television, Set-Top Box and Gaming Audio, Digital Crossover and Multi-Way Speaker Processor.
High-End USB and Network DAC
The AK4490EN is the natural centerpiece of a desktop USB or network DAC because it accepts I2S PCM data straight from an XMOS or FPGA audio engine and converts it with 32-bit resolution while decoding DSD up to 768 kHz. Place the converter behind a low-jitter clocking stage and keep the digital bus short and ground-referenced so that the 2-channel architecture can deliver its full low-distortion performance into a line-level output stage. In a streamer design the converter handles FLAC, WAV and DSD files from a common source, and the exposed pad keeps junction temperature controlled next to a dense digital section.
推薦
Professional Studio Monitor Digital Stage
Studio monitors driven from a digital source often need a converter that resolves very low level detail, and the AK4490EN's 32-bit 2-channel delta-sigma core with DSD256 (768 kHz) capability suits both monitoring and mastering playback chains. Pair it with a fully differential output buffer so that the converter's balanced capability is preserved into the power amplifier. Because the AK4490EN is a surface-mount QFN (6 x 6 mm) with an exposed pad, it fits on a compact digital board placed near the analog output connectors, shortening the analog path and reducing susceptibility to ground-loop pickup in a studio environment.
推薦
CD Player and Digital Transport
A CD transport or disc-based digital source usually presents a clean I2S stream at 44.1 kHz and 48 kHz, which the AK4490EN converts to analog with 32-bit precision and dual-channel capability. Using a dedicated high-resolution DAC in the transport keeps the analog output section independent of the transport's own converters and lets the designer select the digital filter mode and roll-off that best suits the listening environment. The QFN (6 x 6 mm) surface-mount footprint is easy to place on the transport's main board, and the exposed pad can be tied into the chassis ground structure to support a low-impedance analog return.
推薦
Portable Hi-Fi Headphone DAC Dongle
Battery-powered headphone DAC dongles need a converter that is small, efficient and quiet enough to sit under a very low noise floor. The AK4490EN delivers 32-bit 2-channel conversion in a compact QFN (6 x 6 mm) package that suits dense portable layouts, and its I2S input works directly with common low-power USB audio controllers. The exposed pad must be bonded to a solid ground pour in a layered flex or rigid-flex board so that heat leaves the die efficiently and analog returns stay short, which helps preserve the low in-band noise the converter is capable of.
推薦
Television, Set-Top Box and Gaming Audio
Consumer AV products that need better sound than an integrated codec can provide typically need a stereo DAC with a straightforward digital interface and a small footprint. The AK4490EN accepts I2S data from the main SoC audio port and outputs two analog channels, so a simple bypass of the SoC's internal converter is possible without changing the system digital architecture. Its 48-QFN (6 x 6 mm) surface-mount package also keeps the analog island compact, which matters in thin chassis where analog and switching regulators compete for board area near the display and power sections.
推薦
Digital Crossover and Multi-Way Speaker Processor
Active speakers and digital crossover boards process multiple bands before driving drivers, and a high-resolution stereo DAC can be used for the midrange and tweeter channels where detail and low distortion matter most. The AK4490EN's 32-bit word length preserves headroom through the crossover filters and its DSD256 (768 kHz) capability allows a common digital pipeline to serve both PCM and DSD sources. Place each converter on its own analog section of the board with a dedicated local ground pour and short output traces to the driver amplifier inputs, keeping switching regulator loops away from the exposed-pad region.
推薦
推薦產品摘要
工程參考資料，適用於 AK4490EN — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AK4490EQ | AK4490VN |
|---|---|---|---|
| Device Type | Stereo audio DAC (32-bit delta-sigma) | Stereo audio DAC (32-bit delta-sigma) | Stereo audio DAC (32-bit delta-sigma) |
| Brand | Asahi Kasei Microdevices | Asahi Kasei Microdevices | Asahi Kasei Microdevices |
| Package | 48-QFN (6 x 6 mm) with exposed pad | 48-QFN (6 x 6 mm) with exposed pad - same | 48-QFN (6 x 6 mm) with exposed pad - same |
| Resolution | 32 bit | 32 bit | 32 bit |
| Channels | 2 | 2 | 2 |
| Maximum DSD Rate | 768 kHz (DSD256) | 768 kHz (DSD256) | 768 kHz (DSD256) |
| Digital Audio Interface | I2S | I2S | I2S |
| Pin Count | 48 pins | 48 pins | 48 pins |
| Exposed Thermal Pad | Yes, exposed pad | Yes, exposed pad | Yes, exposed pad |
主要差異化特點
- Native DSD256 decoding in a 32-bit stereo delta-sigma DAC (對比ESS ES9038Q2M)
- Exact footprint-compatible sourcing within the same die (對比AK4490EQ)
- Simpler single-package converter versus multi-chip output architecture (對比TI PCM5122PWR)
設計說明
Keep the AK4490EN digital input traces short, continuous and referenced to a solid ground plane, and route them away from the analog output nets. The I2S data, BCLK and LRCK lines should be length-matched to each other and kept clear of switching regulator inductors. Place the exposed-pad solder lands on a dedicated via array down to the ground plane so that the die has a low-impedance thermal and return path.
Separate the analog and digital supply routing into their own filtering branches, each terminated with local bulk ceramic capacitance plus a high-frequency decoupling capacitor placed within a few millimetres of the supply pins. Because the AK4490EN resolves 32-bit signals, supply noise and ripple directly limit the achievable noise floor; use low-ESR ceramics and keep the switching converter physically separated from the converter island.
Do not treat the AK4490EN as a plug-in part for any converter with a different pin count. Devices such as the ESS ES9038Q2M use a 32-pin QFN in a 5 x 5 mm body and the TI PCM5122PWR uses a TSSOP package; both are functional alternatives for a new layout but neither is a footprint-compatible replacement for a 48-QFN (6 x 6 mm) board. Also confirm the DSD versus PCM digital filter configuration in the manufacturer datasheet rather than assuming a single filter applies to both paths.
Estimated: the exposed pad is the primary heat path for the AK4490EN. With the pad bonded to a full ground pour on a four-layer board, junction temperature rise is governed by the board copper area and the pad via count; increase the via array if the converter sits next to a hot output stage. Verify with a thermal camera or thermocouple on the exposed pad during worst-case analog power dissipation, and confirm the operating temperature range in the AKM AK4490 datasheet.
合規資訊
The AK4490EN is a lead-free surface-mount QFN device; RoHS, REACH and halogen-free declarations for the exact orderable suffix should be confirmed with the current manufacturer material declaration, which can be requested alongside a quotation.
