The DS280MB810 is an extremely low-power, high-performance eight-channel linear equalizer
supporting multi-rate, multi-protocol interfaces up to 28 Gbaud. 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 DS280MB810 includes a full 2x2 crosspoint switch between each pair of adjacent
channels which enables 2-to-1 multiplexing and 1-to-2 de-multiplexing applications for failover
redundancy, as well as signal cross-over to aid PCB routing. The crosspoint can be controlled
through pins or the SMBus register interface.
The linear nature of the DS280MB810’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. The DS280MB810 supports two-level
and four-level pulse amplitude modulation (PAM) for symbol rates up to 28 Gbaud and peak signal
amplitude within the linear operating range.
Each channel operates independently, and every channel can be configured uniquely. In
most application scenarios, the same configuration can be used regardless of data rate.
The DS280MB810s small package dimensions, optimized high-speed signal escape, and the
pin-compatible Retimer portfolio make the DS280MB810 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, CFP, 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 DS280MB810 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 with crosspoint is available for longer reach
The DS280MB810 can be configured either via the SMBus or through an external EEPROM. Up
to 16 devices can share a single EEPROM. 4279774
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