AK4399EQ - 32-Bit 216kHz DSD Audio DAC | Asahi Kasei
MPN： AK4399EQ ✓ 啟用中AK4399EQ 概覽
A DAC, or digital-to-analog converter, is the data converter that turns digital audio sample streams into a continuous analog voltage that can drive amplifiers, headphones or line inputs. Within the semiconductor hierarchy, a DAC sits under audio data converter, then data converter IC, then integrated circuit. The AK4399 belongs to the family of premium stand-alone stereo DACs rather than integrated audio codecs, which lets a designer keep the digital source and the analog output stage architecturally separate.
Key features include a 32-bit internal digital filter designed for low distortion and wide dynamic range, 216 kHz maximum sample-rate operation, DSD decoding capability, serial (I2S-compatible) digital audio input, and a compact 44-LQFP surface-mount package with 0.80 mm lead pitch. The device is supplied lead-free and is a surface-mount part suited to automated assembly.
Architecturally, the AK4399 separates the digital decoding stage from the analog output stage so that switching noise in the digital domain is rejected before reaching the output pins. The internal 32-bit digital filter is the element that shapes the audio band and limits aliasing, while the analog section determines the final distortion and dynamic-range floor. Because it is a discrete converter rather than a codec, it accepts digital audio from any upstream source - a network streamer, a USB interface, a Blu-ray or CD transport, or a digital mixer - without imposing that source's DAC.
Typical applications include high-end network streamers, USB audio interfaces, digital preamplifiers, CD and SACD transports, USB DAC boards, hi-fi headphone output stages and professional monitoring consoles. The 123 dB dynamic-range figure suits designs where the DAC is expected to be the limiting element in the signal chain.
When designing around the AK4399EQ, keep analog and digital return currents separated, provide clean regulated supplies with local decoupling close to the supply pins, and treat the analog output as a high-impedance load. Confirm the clocking scheme and master/slave relationship with the upstream digital source, since interlock and word-clock errors are the most common cause of audible noise and clicks.
This page consolidates manufacturer description data, distributor availability records, a pin-compatible comparison table and practical design notes so that engineers can evaluate the AK4399EQ against premium 32-bit DAC alternatives without reconstructing the same information from multiple sources.
直接替換替代品，適用於 AK4399EQ — 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： AK4399EQ （相同外形與佔位） — 差異在於 Package, Product Type.
AK4499EQ
✅ 直接替換聯絡詢價
查看資料表 →AK4497EQ
✅ 直接替換聯絡詢價
查看資料表 →AK4561-4
✅ 直接替換📋 參考替代品（不在目錄中）
AK4399VN
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AK4399EQ 最大額定值與電氣特性
| Device Type | Stereo audio DAC (digital-to-analog converter) |
| Bit Depth | 32 bit |
| Maximum Sampling Rate | 216 kHz |
| DSD Support | Yes (DSD decoding) |
| Digital Audio Interface | I2S / serial audio input |
| Dynamic Range / SNR | 123 dB |
| Internal Digital Filter | 32-bit digital filter |
| Target Audio Standard | DVD-Audio systems |
| 封裝 | 44-LQFP (10 x 10 mm) |
| Lead Pitch | 0.80 mm |
| 安裝類型 | Surface Mount |
| Lead-Free Status | Lead Free |
| Manufacturer | Asahi Kasei Microdevices (AKM) |
AK4399EQ 44-lqfp (10 x 10 mm) 腳位配置指南
AK4399EQ（44-lqfp (10 x 10 mm) 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： AK4399EQ.
請參閱 資料表 以查看完整腳位配置。
典型應用
AK4399EQ 適用於 6 應用s: High-Resolution Network Streamer, USB Audio Interface and Desktop DAC, Digital Preamp and Headphone Output Stage, CD and SACD Transport, Professional Monitoring and Recording Console, Automotive and Industrial Audio Modules.
High-Resolution Network Streamer
The AK4399EQ fits a network streamer because it accepts the 32-bit, 216 kHz streams that high-resolution services deliver, converts them through its 32-bit digital filter and presents a 123 dB dynamic-range analog output to the downstream analog stage. Placing it directly behind the streamer's digital output receiver keeps the signal path short and avoids adding a second codec conversion. The converter's role is purely digital-to-analog, so the streamer retains control of volume, filtering and source selection upstream. The practical consideration is supply partitioning: analog and digital rails should be regulated and decoupled separately, because any switching ripple reaching the analog section is directly visible at the output and cannot be filtered out later in the signal chain.
推薦
USB Audio Interface and Desktop DAC
A USB DAC board is the classic home for the AK4399EQ, because a USB-to-I2S bridge feeds the converter a clean digital stream while the AK4399EQ supplies the audiophile-grade analog stage. Its 216 kHz ceiling supports high-rate PCM sources and its DSD capability broadens compatibility with DSD-capable players, while the 123 dB dynamic range ensures the converter is not the limiting element in the chain. In practice the board must solve the analog return path problem: route analog outputs away from the USB bridge and its switching regulators, and keep the digital ground and analog ground returns separate except at a single defined point near the converter.
推薦
Digital Preamp and Headphone Output Stage
The AK4399EQ works well as the conversion stage of a digital preamplifier, where a digital source feeds the converter and the analog signal drives a downstream headphone amplifier rather than a power stage directly. The 32-bit filter keeps the audible band clean of aliasing products, and 123 dB dynamic range provides ample headroom above 16-bit source material. Because the converter is a discrete part rather than a codec, volume control and source switching can be handled digitally upstream of it. The key design check is the analog output configuration and required load, which must be confirmed in the manufacturer datasheet, together with clock and interlock timing to the digital source.
推薦
CD and SACD Transport
The AK4399EQ suits optical-disc transports where the digital output is transmitted over S/PDIF or I2S at 44.1 kHz through 192 kHz and where dynamic range across the disc mastering range must be preserved. Converting as close as possible to the transport minimizes analog path length and keeps the DAC's own noise contribution well below the mastering floor. The DVD-Audio-oriented feature set of the device also makes it a natural fit for transports that handle multi-channel-derived stereo streams. Engineering attention belongs on the clock: derive the converter's master clock from a low-jitter source and keep the word-clock and interlock traces short and shielded from the analog output section.
推薦
Professional Monitoring and Recording Console
Monitoring consoles and studio outboard converters need a converter whose dynamic range and distortion floor sit well below the monitored programme material, and the AK4399EQ's 123 dB specification fits that role in a 44-LQFP surface-mount footprint suitable for dense console boards. As a standalone converter it can be paired with an ADC on the same board for monitoring loopback, keeping capture and playback conversion aligned in one digital domain. Practical considerations in studio equipment are ground-loop avoidance between chassis and signal grounds, and the generation of clean analog rails for a converter whose output drives line-level inputs through a balanced stage.
推薦
Automotive and Industrial Audio Modules
Compact audio modules in vehicle head units and industrial control panels often have limited board area, making the 10 x 10 mm 44-LQFP package attractive when a high-quality conversion path is required alongside functional-safety-relevant subsystems. The AK4399EQ's 216 kHz and DSD capability supports modern infotainment sources, while the lead-free surface-mount construction suits automated production lines. The design trade-off is thermal and supply environment: industrial and automotive rails are noisier and wider-ranging than consumer rails, so the converter's supply rails should be filtered and regulated locally, and the module layout must separate the analog output region from switching regulators and digital processors on the same assembly.
推薦
推薦產品摘要
工程參考資料，適用於 AK4399EQ — 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 | AK4499EQ | AK4497EQ | AK4561-4 | AK4399VN |
|---|---|---|---|---|---|
| Brand | Asahi Kasei Microdevices (AKM) | Asahi Kasei Microdevices (AKM) | Asahi Kasei Microdevices (AKM) | Asahi Kasei Microdevices (AKM) | Asahi Kasei Microdevices (AKM) |
| Package | 44-LQFP (10 x 10 mm), 0.80 mm pitch | LQFP (10 x 10 mm) - same footprint | LQFP (10 x 10 mm) - same footprint | LQFP (10 x 10 mm) - similar footprint | LQFP (10 x 10 mm) - same footprint |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
主要差異化特點
- Premium 32-bit conversion with DSD decoding in a single 44-LQFP converter (對比AK4561-4)
- Clear cost/performance position between entry and reference converters (對比AK4499EQ)
- DVD-Audio-oriented internal 32-bit digital filter (對比AK4497EQ)
- Drop-in family options without PCB respin (對比AK4399VN)
設計說明
Treat the AK4399EQ analog and digital sections as two separate return domains. Route the analog output pair away from the I2S data, word-clock and interlock nets, and join analog and digital ground only at a single defined point near the device. Do not let the analog ground current return underneath the digital input pins, and keep the analog output traces short and matched if they feed a balanced stage. This single layout decision usually determines whether the converter's 123 dB dynamic-range figure is actually realised in the finished board.
Provide separate, locally decoupled supply paths for the analog and digital rails of the AK4399EQ, since the analog section sets the achievable noise floor. Place the ceramic bulk capacitors directly at the supply pins and add a small-value high-frequency capacitor in parallel for the digital domain. Use a regulator with low output noise for the analog rail, and if the converter sits behind a switching supply, filter the rail rather than relying on the digital filter to remove ripple that has already reached the output stage.
Most audible problems in designs using the AK4399EQ trace back to clocking rather than to the converter itself. Verify master versus slave mode, the required relationship between the master clock, bit clock and word clock, and the interlock timing to the upstream source before tuning the analog side. A marginal clock arrangement produces clicks, periodic pops or intermittent noise that is easily mistaken for a defective converter, so validate the digital interface on a bench with a known-good source before finalising the analog chain.
Check the analog output configuration and the expected load impedance in the manufacturer data sheet before sizing the output stage. Driving the output into a very low impedance, or adding an output buffer that is not stable with the capacitive and inductive loading of the board, can degrade distortion even when the converter itself is within specification. Similarly, do not insert long adapter leads or an external output transformer between the DAC and the first amplifier stage, as board-level parasitics then become part of the audio path.
合規資訊
The part is distributed and listed as lead-free in a surface-mount LQFP package. Formal RoHS, REACH, halogen-free and AEC-Q100 statements are not published on the accessed product pages, so request current compliance documentation for your programme.
