12.5Gbps Settable Receive Equalizer

Industry's First 12.5Gbps Equalizer Extends Reach to 30in of FR4 in Serial Communications


The MAX3804 driver with integrated analog equalizer compensates up to 20dB of loss at 5GHz. It is designed to ensure PC board signal integrity up to 12.5Gbps, where frequency-dependent skin effect and dielectric losses typically produce unacceptable amounts of intersymbol interference. The MAX3804 can extend the practical chip-to-chip transmission distance for 10Gbps NRZ serial data up to 30in (0.75m) on FR-4, and it significantly decreases deterministic jitter. Residual jitter after equalization for 10.7Gbps signals is typically 24psP-P on the maximum path length.

The MAX3804 is ideal for 10Gbps chip-to-chip serial interconnections on inexpensive FR-4 material. Its 3mm x 3mm package affords optimal placement and routing flexibility. It has separate VCC connections for internal logic and current-mode logic (CML) I/O. This allows the CML input and output to be referenced to isolated supplies, providing independent DC-coupled interfacing to 1.8V, 2.5V, or 3.3V ICs. Eight discrete levels of input equalization can be selected through a digital control input, enabling the equalizer to be matched to a range of transmission line path loss. When correctly set to match the path loss, the MAX3804 provides optimal performance over a wide range of data rates and formats.
MAX3804: Typical Operating Circuit MAX3804: Typical Operating Circuit Enlarge+

Key Features

  • Compensates Up to 30in (0.75m) of 6-mil FR-4 Transmission Line Loss
  • 115mW Operating Power
  • Up to 12.5Gbps Data Rate
  • Compatible with 8B10B, 64B66B, and PRBS Data
  • Less than 30psP-P Residual Jitter After Equalization
  • 3-Bit Equalization Level Select Input
  • 3mm x 3mm Thin QFN Package
  • DC-Coupling to 1.8V, 2.5V, or 3.3V CML I/O
  • -40°C to +85°C Operation
  • +3.3V Core Supply Voltage


  • High-Speed Signal Distribution
  • OC-192 and 10Gb Ethernet Serial Modules
  • OC-192 and 10Gb Ethernet Switches and Routers
Part Number Applications Data Rate
Data Rate
Max. Reach @ Max. Data Rate VSUPPLY
I/O Type Channels Rx Eq. @ Max. Rate
Package/Pins Oper. Temp.
min max typ See Notes
Copper Cable Interconnect
Fibre Channel
Printed Circuit Board Interconnect
0 12500 0.8m FR4 3.3 CML 1 20
-40 to +85 $11.28 @1k
See All Equalizers (Cable and Circuit Board) (15)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX3804EVKIT: Evaluation Kit for the MAX3804

Tools & Models


Related Resources