MS2109S USB 2.0 HD Audio/Video Capture and Mixing Processor

The MacroSilicon MS2109S is a USB 2.0 HD audio/video capture and mixing processor. It integrates a USB 2.0 Device controller, data transceiver, HD RX block, and audio/video processing blocks, allowing HD input audio/video to be previewed or captured on PCs, smartphones, and tablets over USB.

MS2109S supports UVC 1.0 video, UAC 1.0 audio, YUV422 / MJPEG USB output, two I2S inputs, I2S/SPDIF output, and digital audio mixing. It is suitable for USB2.0 driverless capture cards, low-latency capture devices, and capture modules with external digital-audio interfaces.

Key Capabilities

Item	Specification
USB interface	Integrated USB 2.0 Device, compatible with USB 1.1 Device mode
USB video protocol	UVC 1.0
USB audio protocol	UAC 1.0
Video input	HD RX, up to 4096 × 2160 @ 30Hz (RGB444 / YCbCr444) or 4096 × 2160 @ 60Hz (YCbCr420)
USB video output	YUV422, MJPEG
Default max USB output	1920 × 1080 @ 60Hz
Content protection	HDCP 1.4 supported
Audio interfaces	2 I2S inputs, 1 I2S output, 1 SPDIF output
Audio processing	Default USB 48 kHz stereo output, I2S input audio mixed with HD RX audio
OS support	Windows XP/7/8/10/11, Android 5.0+, Linux, macOS
Package	QFN-48, 7 mm × 7 mm

Block Diagram

The block diagram shows the MS2109S relationship between HD RX input, video/audio processing, UVC/UAC encoding, USB 2.0 Device, I2S/SPDIF audio interfaces, MCU, programmable IO, EEPROM, PMU/PLL, and Memory Controller.

HD RX Input

• RGB444, YCbCr 4:4:4, YCbCr 4:2:2, and YCbCr 4:2:0 color spaces.
• Deep Color 24 / 30 / 36-bit modes.
• CEA-861-E and CEA-861-F video formats.
• HDCP 1.4 support.
• Maximum input resolution:
  • 4096 × 2160 @ 30Hz (RGB444, YCbCr444)
  • 4096 × 2160 @ 60Hz (YCbCr420)

USB Capture Output

• Integrated USB 2.0 Device, compatible with USB 1.1 Device mode.
• USB video complies with UVC 1.0.
• USB audio complies with UAC 1.0.
• USB video output supports YUV422 and MJPEG modes.
• Default maximum USB video output resolution is 1920 × 1080 @ 60Hz.
• Low-latency operation is supported; when input and output frame rates are equal, the official page describes latency as close to zero.

Audio Features

• USB audio default 48 kHz stereo output.
• Two I2S inputs.
• One I2S output and one SPDIF output.
• Mixing of two I2S input audio streams with HD RX input audio.

Clock, Power, Reset, and Package

Item	Specification
External clock	External 24 MHz passive crystal
PLL	Integrated PLL circuit
Reset	Integrated power-on reset circuit
Power	Integrated 3.3 V LDO
Package	QFN-48, 7 mm × 7 mm

Typical Applications

• USB 2.0 HD capture cards
• Low-latency 1080p60 UVC video capture devices
• Capture modules requiring I2S / SPDIF digital-audio interfaces
• Video conferencing, live streaming, recording, and education capture devices
• Portable capture products for PCs, smartphones, and tablets

Design Notes

• MS2109S supports 4K input, but the default maximum USB video output is 1920 × 1080 @ 60Hz; distinguish input capability from USB output capability during system design.
• Low-latency behavior depends on equal input/output frame rates and the actual firmware, host, and application configuration.
• USB2.0 bandwidth is limited; MJPEG/YUV422 output modes, resolution, and frame-rate combinations should be validated with the target host.
• Designs using HDCP 1.4 should confirm licensing, key handling, and content-protection compliance.
• Production designs should be based on the authorized MacroSilicon SDK, firmware, reference design, and board-level validation.

References

• MacroSilicon MS2109S public product page
• MacroSilicon model summary
• Video Capture series

Notes

This page summarizes information published on MacroSilicon's public MS2109S product page. Confirm feature combinations, output formats, low-latency behavior, OS compatibility, and production support against the latest authorized documentation and project validation results.