HDMI 2.1 eARC Transmitter/Receiver

Enhanced Audio Return Channel Solutions for all Versions of HDMI

Future Compatibility – eARC is the only way to ensure that an audio device will be fully compatible with future HDMI 2.1 televisions

Simplify – eARC makes home theaters easy to use.

Improve Performance – Delivers all of HDMI-enabled high bitrate home theater audio formats, including Dolby Atmos and DTS:X.


  • Lattice ICs are available for both televisions and audio devices
  • Solutions work with any existing HDMI transmitter or receiver IC and can be used with any version of HDMI
  • Supports both HDMI 2.1 eARC and HDMI 1.4 legacy ARC modes with automatic ARC fallback
  • eARC Data Channel functions are supported via I2C interface: Transmits HDMI 2.1 standard, bi-directional discovery and control signals within the eARC signal
  • 4mm x 4mm QFN package with 0.4mm pin pitch

Family Table

HDMI eARC ASSPs SiI9437 SiI9438
HDMI 2.1 eARC Input Output
HDMI 2.1 eARC Bi-directional Data Channel Yes Yes
HDMI 1.4 eARC Fall-back Yes Yes
SPDIF Output Input
8-ch I2S interface @ 192 KHz Output Input
Package 32-pin QFN 32-pin QFN
Pin Pitch 0.4 mm QFN 0.4 mm QFN
Package Size 4 x 4 mm 4 x 4 mm
Starter Kit CP9437 CP9438

Example Solutions

Enhanced Audio Return Channel (eARC)

  • eARC is an audio link that is self-discovering, self-configuring, and fully automatic which sends audio backwards in the HDMI cable, from the TV to an audio device.
  • Automatically works with any video source the television is displaying.
  • Is automatically detected and the TV speaker automatically mutes when eARC is engaged.

AVR/Sound Bar (receives eARC)

  • Block Diagram with Sil9347 eARC Receiver (32-pin QFN)
  • With eARC, audio transmission is reverse direction.
  • An HDMI Transmitter in the audio device receives audio over the two eARC pins.


Using eARC to Easily Enable Theater Quality Surround Sound
Expand Video

Using eARC to Easily Enable Theater Quality Surround Sound

This video introduces the benefits of HDMI 2.1’s eARC feature:

  • Higher bandwidth – 37M of audio that supports all audio formats
  • Full home theater experience with the simplicity of operating a TV set
  • Future proof receivers against changes in video standards


Quick Reference
Information Resources
Select All
SiI9437/SiI9438 ARC/Enhanced ARC Receiver and Transmitter
SiI-DB-02013 2.0 11/7/2017 PDF 738.1 KB
Select All
HDMI® Enhanced Audio Return Channel (eARC) Future Proofs Home Theater Connectivity with Uncompromised Audio Quality
1.0 1/13/2018 PDF 294.1 KB

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