The DS280BR820 is an extremely low-power, high-performance eight-channel linear equalizer supporting multi-rate, multi-protocol interfaces up to 28 Gbps. It is used to extend the reach and improve the robustness of high-speed serial links for backplane, front-port, and chip-to-chip applications.
The linear nature of the DS280BR820’s equalization preserves the transmit signal characteristics, thereby allowing the host and link partner ASICs to freely negotiate transmit equalizer coefficients (100G-CR4/KR4). This transparency to the link training protocol facilitates system-level interoperability with minimal effect on the latency. Each channel operates independently, which allows the DS280BR820 to support individual lane Forward Error Correction (FEC) pass-through.
The DS280BR820’s small package dimensions, optimized high-speed signal escape, and the pin-compatible Retimer portfolio make the DS280BR820 ideal for high-density backplane applications. Simplified equalization control, low power consumption, and ultra-low additive jitter make it suitable for front-port interfaces such as 100G-SR4/LR4/CR4. The small 8-mm x 13-mm footprint easily fits behind numerous standard front-port connectors like QSFP, SFP, CFP2, CFP4, and CDFP without the need for a heat sink.
Integrated AC coupling capacitors (RX side) eliminate the need for external capacitors on the PCB. The DS280BR820 has a single power supply and minimal need for external components. These features reduce PCB routing complexity and bill of materials (BOM) cost.
A pin-compatible Retimer device is available for longer reach applications.
The DS280BR820 can be configured either through the SMBus or through an external EEPROM. Up to 16 devices can share a single EEPROM.
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | DS280BR820 Low Power 28 Gbps 8 Channel Linear Repeater datasheet (Rev. B) | PDF | HTML | 03 Oct 2019 |
| Application note | Optimal Implementation of 25G-28G Ethernet Retimers versus Redrivers (Rev. B) | PDF | HTML | 01 May 2023 | |
| EVM User's guide | DS280BR810EVM User's Guide (Rev. B) | 03 Sep 2019 | ||
| More literature | Advanced Signal Conditioning Made Easy and Efficient | 12 Jan 2017 | ||
| Application note | Understanding EEPROM Programming for 25G and 28G Repeaters and Retimers | 13 Jan 2016 |
For additional terms or required resources, click any title below to view the detail page where available.
The DS280BR820EVM allows for easy evaluation of the DS280BR820 28 Gbps 8-channel linear repeater. To use this EVM, supply power (2.5V or 3.3V) via standard banana connectors and high-speed traffic via Huber+Suhner 1x8 MXP connectors. Huber+Suhner cable assemblies are not included.
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| NFBGA (ZBL) | 135 | Ultra Librarian |
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