3G/HD/SD-SDI Ultra Low Power Reclocker with Cable Driver

The M31285 is a low power, multi-rate, highly integrated digital video reclocker with fully featured dual cable drivers. The M31285 is SMPTE SDI and DVB-ASI video compliant and it can also be used in digital audio applications. The reclocker provides high input jitter tolerance and input equalization for up to 60" of FR4 trace and a built-in automatic rate detection circuit locks to 270 Mbps, 1.4835/1.485 Gbps, and 2.967/2.97 Gbps rates. The reclocker operates without the need for a reference clock, it has an integrated loop filter and supports the MADI audio standard. Integrated into the M31285 is a fully featured cable driver with four outputs, two positive and two negative polarity. Swing levels from 400 mVpp to 800 mVpp can be programmed through an internal register. The reclocker rate detection circuitry can control the SD/HD edge of the cable driver. Integration of the reclocker and cable driver provides major benefits in power, board real estate and ease of design. The device operates using a single 2.5 V supply voltage and has extremely low power consumption with the reclocker and cable driver dissipating only 160 mW. It may be used in either hardware mode or controlled through a standard four-wire serial digital interface. It also features advanced diagnostic capabilities such as total jitter measurement on input, data rate detection, Loss of Signal (LOS), and Loss of Lock (LOL) detection. The M31285 is offered in a compact green and RoHS compliant 4 mm x 4 mm, 32-pin QFN package.

Product Specifications

Part Number
3G/HD/SD-SDI Ultra Low Power Reclocker with Cable Driver
Max Data Rate(Gbps)
Supply Voltage
Package Size
Power Consumption(Watts)


  • SMPTE 424M, SMPTE 292M, SMPTE 259M, DVB-ASI and AES10-2008 compliant
  • Automatic slew rate control for SD and 3G/HD operation
  • Cable detect and individual mute control
  • Programmable output pre-emphasis
  • Integrated cable driver with dual outputs
  • Dual 4x1 input muxes
  • Integrated loop filter
  • Input jitter diagnostics
  • Very low power consumption, 160mW
  • No need for an external reference clock
  • Input equalization for up to 60" of FR4 trace
  • Automatic or manual rate selection
  • Automatic or manual bypass mode
  • Single 2.5 V supply
  • Loss of Lock (LOL), Loss of Signal (LOS) and data rate Indication

Technical Resources

Data Sheet

Order from MACOM

EVM for M31285
3G/HD/SD-SDI, Reclocker with CD
M31285G-21 Distributors