Texas Instruments LMH0397RTVT

The LMH0397 is a 3G-SDI 75-Ω bidirectional I/O with integrated reclocker. This devicecan be configured either in input mode as an adaptive cable equalizer or in output mode as a dualcable driver, allowing system designers the flexibility to use a single BNC either as an input oroutput port to simplify HD-SDI video hardware designs. The integrated reclocker locks to allsupported SMPTE data rates up to 2.97 Gbps in both modes. The bidirectional I/O has an on-chip 75-Ωtermination and return loss compensation network that meets the stringent SMPTE return lossrequirements.

An additional 75-Ω driver output allows the LMH0397 to support a variety of systemfunctions. In EQ (Equalizer) Mode, this second 75-Ω driver can be used as a loop-through output. InCable Driver (CD) Mode, this 75-Ω driver can be used as a second fan-out cable driver. Thehost-side 100-Ω driver can also be used as a loopback output in CD Mode for monitoringpurposes.

The on-chip reclocker attenuates high-frequency jitter and fully regenerates the datausing a clean, low-jitter clock. The reclocker has a built-in loop filter and does not require anyinput reference clock. The LMH0397 also has an internal eye opening monitor and a programmable pinfor CDR lock indication, input carrier detect, or hardware interrupts to support system diagnosticsand board bring-up.

The LMH0397 is powered from a single 2.5-V supply. The device is offered in a small 5-mm× 5-mm, 32-pin WQFN package. The LMH0397 is also pin-compatible with theLMH1297.