3G/HD/SD-SDI Low Power Dual Cable Driver

The M21528 is a very low power, highly integrated, dual cable driver for SMPTE-compliant digital video applications. It can drive two pairs of 75O coaxial cables, or 50O equivalent loads, at SDI data rates from 143 Mbps to 2.97 Gbps. The device is capable of outputting SDI signals with jitter values of less than 20 ps peak-to-peak when operating at 2.97 Gbps. The dual cable driver includes a 2x2 input crosspoint and integrated input and output termination resistors. The M21528, with input equalization for up to 40" of FR4 trace in addition to two connectors and exceptional Output Return Loss (ORL), is ideal for high speed, 3G-SDI designs. The device features integrated supply regulators, allowing it to be powered from 1.8 V, 2.5 V, or 3.3 V supply voltages. When operating at 1.8 V, it consumes only 40 mW per channel at 2.97 Gbps. Furthermore, the power rails for the input and output circuitry are electrically isolated on-chip and as such may be connected to different voltage rails on the board. This feature enables the M21528 to be DC coupled to any upstream device in the 1.2 V to 3.3 V range.

Product Specifications

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


  • Independent, dual channel, multi-rate cable driver
  • Loss of input signal detection with automatic power down and power up upon cable disconnect and re-connect
  • Cable detect with automatic power down and power up upon cable disconnect and re-connect
  • Universal DC coupling at the input (1.2 V - 3.3 V)
  • Integrated regulators for multi-voltage operation (1.8 V - 3.3 V)
  • Integrated 2x2 crosspoint switch
  • Selectable slew rate for SD and 3G/HD operation
  • Input equalization 40" of FR4 trace + two connectors
  • Very low power design - 40 mW/channel @1.8 V
  • Integrated 50O input termination
  • Integrated, selectable, 75O or 50O output termination
  • Typical output jitter < 20 ps peak-to-peak at 2.97 Gbps
  • Exceptional output return loss with no matching network
  • SMPTE 424M, 292M, and 259M compliant
  • Industrial operating temperature range ( -40 °C to +85 °C)

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