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All in the name of ultimate Real Live Sound
Leading a new era of High-resolution audio
The new circuitry found in VELVET SOUND devices is designed to maximize dynamics and ensure pure, unaltered audio data, prioritizing the accurate capture and reproduction of the source material in order to achieve high performance and rich musicality. These devices were designed specifically for the high-resolution digital audio era.
FEATURED PRODUCTS
VERITA AK4499EQ
Flagship Premium D/A Converter
The AK4499EQ current-output DAC is AKM’s latest VELVET SOUND VERITA product, following on from the previous flagship device, the AK4497EQ.
Current-output DAC Achieves Best-in-Class Performance
AKM’s Low-Distortion Technology has been optimized for the AK4499’s current-output architecture, resulting in a THD+N measurement of -124dB. The AK4499EQ achieves SNR of 140dB in mono mode.
Dynamic High-Resolution Playback with Incredible Detail
The AK4499EQ is produced using the same Premium Audio LSI process and Non-Magnetic Packaging technology originally developed for the AK4497EQ. These techniques dramatically improve noise performance, especially in the traditionally problematic lower frequency range.
Key Features
- Maximum Sampling Frequency, Bit rate : PCM 768kHz/32-bit, DSD 22.4MHz
- SNR : 134dB (Mono mode: 140dB)
- THD+N : -124dB
- Sound Color Digital Filter : 6 types
D/A Converters (DAC)
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Premium D/A Converters
| Part Number | Document | Ch # | Res. | S/N | THD+N * | Max fs * |
DSD Input * |
Sound Color * |
Power Consump. |
Vdd | Package | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| bit | dB | dB | kHz | MHz | mW | V | ||||||
| AK4499EQ | 4 | 32 | 134 (140 *) | -124 | 768 | 22.4 | 6 types | 667 | 5.0/3.3 or 1.8 |
HTQFP-128 | VERITA | |
| AK4497EQ | Datasheet | 2 | 32 | 128 (131 *) | -116 | 768 | 22.4 | 6 types | 346 | 5.0/3.3 or 1.8 |
TQFP-64 | |
| AK4493EQ |
2 | 32 | 123 (126 *) | -113 | 768 | 22.4 | 6 types | 203 | 5.0/3.3 or 1.8 |
LQFP-48 | ||
| AK4490EQ | Datasheet | 2 | 32 | 120 (123 *) | -112 | 768 | 11.2 | 5 types | 145 | 5.0 | LQFP-48 | |
| AK4452VN | Datasheet | 2 | 32 | 115/111 | -107/-95 | 768 | 11.2 | 5 types | 50 | 5.0/3.3 | QFN-32 | |
| AK4454VN | Datasheet | 4 | 32 | 115/111 | -107/-95 | 768 | 11.2 | 5 types | 97 | 5.0/3.3 | QFN-32 | |
| AK4456VN | Datasheet | 6 | 32 | 115/111 | -107/-95 | 768 | 11.2 | 5 types | 140 | 5.0/3.3 | QFN-48 | |
| AK4458VN | Datasheet | 8 | 32 | 115/111 | -107/-95 | 768 | 11.2 | 5 types | 181 | 5.0/3.3 | QFN-48 | |
| AK4468VN | Datasheet | 8 | 32 | 117/113 | -107/-100 | 768 | 22.4 |
5 types | 245 |
5.0/3.3 | QFN-48 |
[Notes]
* S/N (Mono mode)
* THD+N: Total Harmonic Distortion plus Noise
* Max fs: Maximum Sampling Frequency
* DSD: Direct Stream Digital
* Sound Color: AKM original digital filter
* Schedules of Samples and Production are subject to be changed without notice.
* The information in the datasheet is subject to be changed without notice.
A/D Converters (ADC)
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Premium A/D Converters
| Part Number | Document | Ch # | Res. | S/N | THD+N * | Max fs * | DSD Input * |
Sound Color * |
Power Consump. |
Vdd | Package | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| bit | dB | dB | kHz | MHz | mW | V | ||||||
| AK5397EQ | Datasheet | 2 | 32 | 127 (130 *) | -108 | 768 | ― | 3 types | 455 | 5.0/3.3 | LQFP-44 | |
| AK5572EN | Datasheet | 2 | 32 | 121 (124 *) | -112 | 768 | 11.2 | 4 types | 148 | 5.0 | QFN-48 | VERITA |
| AK5574EN | Datasheet | 4 | 32 | 121 (127 *) | -112 | 768 | 11.2 | 4 types | 275 | 5.0 | QFN-48 | VERITA |
| AK5576EN | Datasheet | 6 | 32 | 121 (128 *) | -112 | 768 | 11.2 | 4 types | 411 | 5.0 | QFN-64 | VERITA |
| AK5578EN | Datasheet | 8 | 32 | 121 (130 *) | -112 | 768 | 11.2 | 4 types | 536 | 5.0 | QFN-64 | VERITA |
| AK5552VN | Datasheet | 2 | 32 | 115 (118 *) | -106 | 768 | 11.2 | 4 types | 83 | 5.0 | QFN-48 | |
| AK5554VN | Datasheet | 4 | 32 | 115 (121 *) | -106 | 768 | 11.2 | 4 types | 140 | 5.0 | QFN-48 | |
| AK5556VN | Datasheet | 6 | 32 | 115 (122 *) | -106 | 768 | 11.2 | 4 types | 206 | 5.0 | QFN-64 | |
| AK5558VN | Datasheet | 8 | 32 | 115 (124 *) | -106 | 768 | 11.2 | 4 types | 261 | 5.0 | QFN-64 |
[Notes]
* THD+N: Total Harmonic Distortion plus Noise
* Max fs: Maximum Sampling Frequency
* DSD: Direct Stream Digital
* Sound Color: AKM original digital filter
* Schedules of Samples and Production are subject to be changed without notice.
* The information in the datasheet is subject to be changed without notice.
Sample Rate Converters (SRC)
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Premium SRCs
| Part Number | Document | SRC Ch # |
Res. | DR * | THD +N * |
Input fs* (FSI) |
Output fs* (FSO) |
Sound Color * |
Vdd | Package | Others | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| bit | dB | dB | kHz | KHz | V | |||||||
| AK4137EQ | Datasheet | 2 | 32 | 186 | -150 | 8 to 768 | 8 to 768 | 4 types | 3.3/1.8 | LQFP-48 | PCM/DSD converter | VERITA |
| AK4136VQ | Datasheet | 2 | 32 | 176 | -140 | 8 to 384 | 8 to 384 | 4 types | 3.3/1.8 | LQFP-48 |
[Notes]
* DR : Dynamic Range
* THD+N: Total Harmonic Distortion plus Noise
* DSD: Direct Stream Digital
* Sound Color: AKM original digital filter
* Schedules of Samples and Production are subject to be changed without notice.
* The information in the datasheet is subject to be changed without notice.
