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
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
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 × 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)
A pin-compatible Retimer device is available for longer reach applications.
The DS280BR820 can be configured either via the SMBus or through an external EEPROM. Up
to 16 devices can share a single EEPROM.
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