3G/HD/SD-SDI Low Power Reclocker

The M21245 is a serial digital video reclocker with integrated trace equalization, automatic rate detect (ARD) circuitry, and a 4:1 mux at the input. It operates at SDI data rates ranging from 270 Mbps to 2970 Mbps and is compliant to SMPTE 424M, SMPTE292M, and SMPTE 259M-C. At 270 Mbps, it also supports DVB-ASI. The M21245 has an input jitter tolerance (IJT) of greater than 0.6 unit intervals (UI) and can provide retimed serial outputs with very low output jitter. The reclocker requires a single, external, 27 MHz crystal, which is used as the reference clock for all four channels. It includes per lane analog input equalization for up to 40" of FR4 trace and two connectors in addition to output de-emphasis. This device features integrated supply regulators, allowing it to be powered from 1.2V, 1.8V, 2.5V, or 3.3V supply voltages. When operating at 1.2V, it consumes only 230 mW at 3G-SDI. Furthermore, the power rails for the core, input, and output circuitry are electrically independent and as such may be connected to different voltage rails on the board. This feature enables the M21245 to be DC coupled to any upstream or downstream device regardless of its input/output voltage level. The M21245 is offered in a green and RoHS compliant, 6 mm x 6 mm, 40-pin QFN package.

Product Specifications

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


  • SMPTE 259-C, 292M, 424M, and DVB ASI compliant
  • Industrial operating temperature range ( -40°C to +85°C)
  • I2C, SPI and I2C EEPROM interface
  • Loss of Lock (LOL), Loss of Signal (LOS) and data rate indication
  • Automatic and manual modes for rate indication and selection
  • Mute and configurable auto or manual bypass mode
  • Electrically isolated input, output, and core supply rails
  • Integrated regulators extends operation from 1.2 to 3.3V
  • 230mW power consumption per channel (1.2V operation)
  • Output de-emphasis
  • Input equalization 40" of FR4 trace and 2 connectors
  • 4:1 Input multiplexer
  • Integrated 50O input termination
  • 0.6UI Input jitter tolerance

Technical Resources


Product Briefs

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