HF87621_VB1/HF87621Q_VB1¶
Multi-channel PCM 768KHz/DSD512 USB HiFi Decoder with USB/I2S/3CH SPDIF Input and I2S Output
1. Introduction¶
1.1 Product Description¶
HF87621_VB1/HF87621Q_VB1 is a USB multi-channel and multi-interface HiFi audio decoder supporting up to PCM 768KHz/DSD512, specifically designed for HiFi decoder audio applications.
HF87621_VB1/HF87621Q_VB1 supports various standard audio formats, including USB Audio Class 1.0/2.0, S/PDIF and I²S interfaces. The flexible audio interfaces allow HF87621_VB1/HF87621Q_VB1 to connect to various audio data converters, digital audio receivers and transmitters, and digital signal processors.
Compatible with AES3, S/PDIF, IEC 60958, and EIAJ CP-1201 digital audio interfaces.
HF87621_VB1/HF87621Q_VB1 provides multiple input and output modes, including USB input/I²S output, S/PDIF input/I²S output, I²S(slave) input/I²S(master) output, meeting the requirements of different application scenarios.
Important Notice
HF87621Q_VB1 model supports MQA audio decoding, while HF87621_VB1 model does not support this feature.
1.2 Product Features¶
Audio Performance Features
- Supports input and output sampling rates up to 768kHz
- Supports DSD64/128/256/512 formats
- HF87621Q_VB1 supports MQA decoding
- Built-in SSRC and ASRC modules, support conversion between different interfaces and different sampling rates
- Supports 16-32bit audio data formats
Interface Support Features
- Multiple Digital Interface Support
- Supports USB audio input
- Supports I²S slave mode audio input
- Supports I²S master mode audio output
- Supports S/PDIF audio input
- Supports UART configuration interface
- Supports 3-channel S/PDIF input
USB Functional Features
- USB Interface Features
- Supports UAC 1.0
- Supports UAC 2.0
- Supports firmware upgrade via USB
- Supports HID, can upgrade MCU firmware via HID
System Compatibility - UAC 2.0 protocol, supports ASIO - Supports multiple operating systems such as Windows, Linux, Android, macOS and iOS
1.3 Application Scenarios¶
- USB HiFi Decoder
- USB HiFi Audio Interface
- USB HiFi Digital Player
1.4 Product Block Diagram¶
1.5 Ordering Information¶
| PRODUCT | ORDERING NUMBER | PACKAGE BODY | SIZE (NOM) | Hardware Model | Comments |
|---|---|---|---|---|---|
| HF87621_VB1 | HF87621-VB1 | SMT STAMP-30 | 19x26mm | A316-1926-V1 | |
| HF87621Q_VB1 | HF87621Q-VB1 | SMT STAMP-30 | 19x26mm | A316-1926-V1 | Supports MQA Decoding |
2. Modes and Specifications¶
2.1 Supported Input and Output Modes¶
| Mode Number | Input/Output Mode | Description | Mode Switch Command Value (Refer to Product Configuration Protocol 0x03 and 0x23 Commands) |
|---|---|---|---|
| 1 | USB(UAC2.0) in-I²S(Master) out | USB input, I²S output, UAC2.0 | 0x00, 0x80, 0xa9, 0x00, 0x01 |
| 2 | USB(UAC1.0) in-I²S(Master) out | USB input, I²S output, UAC1.0 | 0x00, 0x80, 0x01, 0x00, 0x02 |
| 3 | S/PDIF1 IN-I²S(Master) OUT | S/PDIF channel 1 input, I²S output | 0x10, 0x80, 0x65, 0x10, 0x03 |
| 4 | S/PDIF2 IN-I²S(Master) OUT | S/PDIF channel 2 input, I²S output | 0x00, 0x80, 0x65, 0x10, 0x04 |
| 5 | S/PDIF3 IN-I²S(Master) OUT | S/PDIF channel 3 input, I²S output | 0x00, 0x80, 0xc5, 0x08, 0x05 |
| 6 | I²S(slave) in-I²S(Master) OUT | I²S slave mode input, I²S output | 0x00, 0x82, 0xd5, 0x81, 0x06 |
2.2 Detailed Parameters for Each Operating Mode¶
2.2.1 USB(UAC2.0) in → I²S out Mode¶
Supported Audio Formats and Sampling Rates:
| Audio Format | Supported Sampling Rates |
|---|---|
| PCM | 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz, 352.8kHz, 384kHz, 705.6kHz, 768KHz |
| DSD Native | DSD64, DSD128, DSD256, DSD512 |
| DOP | DOP64, DOP128, DOP256 |
| MQA | HF87621Q_VB1 only |
2.2.2 USB(UAC1.0) in → I²S out Mode¶
Supported Audio Formats and Sampling Rates:
| Audio Format | Supported Sampling Rates |
|---|---|
| PCM | 48kHz |
2.2.3 S/PDIF in → I²S out Mode¶
Supported Audio Formats and Sampling Rates:
| Audio Format | Supported Sampling Rates |
|---|---|
| PCM | 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz |
2.2.4 I²S(slave) in → I²S(Master) out Mode¶
Input/Output Sampling Rate Support:
| Interface | Audio Format | Supported Sampling Rates |
|---|---|---|
| I²S Input (Slave Mode) | PCM | 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz |
| I²S Output (Master Mode) | PCM | 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz |
ASRC (Asynchronous Sample Rate Conversion) Function:
- Internal ASRC conversion supported, input device may not provide master clock (MClock)
ASRC Performance Specifications:
- THD+N (@1kHz, 0dBFs): ≤-130dB
- SNR: ≥135dB
3. Pin Configuration and Functions¶
3.1 HF87621_VB1/HF87621Q_VB1 Pin Layout¶
3.2 HF87621_VB1/HF87621Q_VB1 Pin Description¶
| Pin Number | Name | Type | Function |
|---|---|---|---|
| 1 | GND | P | Module Ground |
| 2 | 3V3 | P | Module 3.3V Power Supply |
| 3 | X1D11 | I/O | Connect to Pin 16 MCLK |
| 4 | X1D10 | I/O | I²S_IN_BCLK(SLAVE) |
| 5 | X1D09 | I/O | NC |
| 6 | X1D01 | I/O | I²S_IN_DATA0(SLAVE) |
| 7 | X1D00 | I/O | I²S_IN_LRCLK(SLAVE) |
| 8 | X0D11 | I/O | UART_RX, connect to MCU_TX |
| 9 | X0D00 | I/O | UART_TX, connect to MCU_RX |
| 10 | X0D31 | I/O | NC |
| 11 | X0D30 | I/O | CTL_MUTE |
| 12 | X1D34 | I/O | S/PDIF channel 3 input |
| 13 | X0D43 | I/O | NC |
| 14 | X0D41 | I/O | NC |
| 15 | X0D42 | I/O | NC |
| 16 | MCLK | I/O | Active crystal 49.152/45.1584MHz clock output |
| 17 | X0D40 | I/O | NC |
| 18 | X0D38 | I/O | I²S_OUT_DATA0(Master) |
| 19 | X0D37 | I/O | NC |
| 20 | X0D36 | I/O | I²S_OUT_LRCLK(Master) |
| 21 | X0D35 | I/O | I²S_OUT_BCLK(MASTER) |
| 22 | X0D29 | I/O | NC |
| 23 | X1D22 | I/O | S/PDIF channel 2 input |
| 24 | X1D19 | I/O | NC |
| 25 | X1D16 | I/O | NC |
| 26 | USB_DP | I/O | USB Data Positive |
| 27 | USB_DM | I/O | USB Data Negative |
| 28 | X1D18 | I/O | NC |
| 29 | X1D17 | I/O | NC |
| 30 | X1D13 | I/O | S/PDIF channel 1 input |
Pin Type Description
- I/O type definitions in the table: I=Input, O=Output, P=Power, I/O=Input/Output
4. Revision History¶
| Version | Date | Description | Revised by |
|---|---|---|---|
| V1.0 | 2025-09-19 | Initial Release | |