Catalog
3G SDI bidirectional I/O with integrated reclocker
Key Features
• User-configurable adaptive cable equalizer or cable driver with integrated reclockerSupports ST-424 (3G), ST-292 (HD), and ST-259 (SD)Compatible with DVB-ASI and AES10 (MADI)Integrated reclocker locks to SMPTE rates of 2.97 Gbps, 1.485 Gbps, or divide-by-1.001 subrates and 270 MbpsOn-Chip 75-Ω termination and return loss compensation networkEQ (equalizer) mode:Adaptive cable equalizer with integrated reclocker100-Ω Output driver with de-emphasisReclocked 75-Ω loop-through outputEQ mode cable reach(Belden 1694A, SDI_OUT Disabled):200 m at 2.97 Gbps300 m at 1.485 Gbps600 m at 270 MbpsCD (cable driver) mode:Dual differential output cable drivers with integrated reclockerAdaptive PCB input equalizerReclocked 100-Ω loopback outputAutomatic pre-emphasis and slew rate control on 75-Ω outputsPolarity inversion on 75-Ω and 100-Ω outputsAutomatic power save in absence of input signalPower dissipation: 25 mW (typical)Power-down control through ENABLE pinSingle 2.5-V supplyEQ mode power dissipation: 275 mW (typical)CD mode power dissipation: 290 mW (typical)Programmable through pins, SPI, or SMBus interface–40°C to +85°C Operating temperature range5-mm × 5-mm, 32-Pin WQFN packagePin compatible with the LMH1297 for easy upgrade to 12G-SDIUser-configurable adaptive cable equalizer or cable driver with integrated reclockerSupports ST-424 (3G), ST-292 (HD), and ST-259 (SD)Compatible with DVB-ASI and AES10 (MADI)Integrated reclocker locks to SMPTE rates of 2.97 Gbps, 1.485 Gbps, or divide-by-1.001 subrates and 270 MbpsOn-Chip 75-Ω termination and return loss compensation networkEQ (equalizer) mode:Adaptive cable equalizer with integrated reclocker100-Ω Output driver with de-emphasisReclocked 75-Ω loop-through outputEQ mode cable reach(Belden 1694A, SDI_OUT Disabled):200 m at 2.97 Gbps300 m at 1.485 Gbps600 m at 270 MbpsCD (cable driver) mode:Dual differential output cable drivers with integrated reclockerAdaptive PCB input equalizerReclocked 100-Ω loopback outputAutomatic pre-emphasis and slew rate control on 75-Ω outputsPolarity inversion on 75-Ω and 100-Ω outputsAutomatic power save in absence of input signalPower dissipation: 25 mW (typical)Power-down control through ENABLE pinSingle 2.5-V supplyEQ mode power dissipation: 275 mW (typical)CD mode power dissipation: 290 mW (typical)Programmable through pins, SPI, or SMBus interface–40°C to +85°C Operating temperature range5-mm × 5-mm, 32-Pin WQFN packagePin compatible with the LMH1297 for easy upgrade to 12G-SDI
Description
AI
The LMH0397 is a 3G-SDI 75-Ω bidirectional I/O with integrated reclocker. This device can be configured either in input mode as an adaptive cable equalizer or in output mode as a dual cable driver, allowing system designers the flexibility to use a single BNC either as an input or output port to simplify HD-SDI video hardware designs. The integrated reclocker locks to all supported SMPTE data rates up to 2.97 Gbps in both modes. The bidirectional I/O has an on-chip 75-Ω termination and return loss compensation network that meets the stringent SMPTE return loss requirements.
An additional 75-Ω driver output allows the LMH0397 to support a variety of system functions. In EQ (Equalizer) Mode, this second 75-Ω driver can be used as a loop-through output. In Cable Driver (CD) Mode, this 75-Ω driver can be used as a second fan-out cable driver. The host-side 100-Ω driver can also be used as a loopback output in CD Mode for monitoring purposes.
The on-chip reclocker attenuates high-frequency jitter and fully regenerates the data using a clean, low-jitter clock. The reclocker has a built-in loop filter and does not require any input reference clock. The LMH0397 also has an internal eye opening monitor and a programmable pin for CDR lock indication, input carrier detect, or hardware interrupts to support system diagnostics and 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.
The LMH0397 is a 3G-SDI 75-Ω bidirectional I/O with integrated reclocker. This device can be configured either in input mode as an adaptive cable equalizer or in output mode as a dual cable driver, allowing system designers the flexibility to use a single BNC either as an input or output port to simplify HD-SDI video hardware designs. The integrated reclocker locks to all supported SMPTE data rates up to 2.97 Gbps in both modes. The bidirectional I/O has an on-chip 75-Ω termination and return loss compensation network that meets the stringent SMPTE return loss requirements.
An additional 75-Ω driver output allows the LMH0397 to support a variety of system functions. In EQ (Equalizer) Mode, this second 75-Ω driver can be used as a loop-through output. In Cable Driver (CD) Mode, this 75-Ω driver can be used as a second fan-out cable driver. The host-side 100-Ω driver can also be used as a loopback output in CD Mode for monitoring purposes.
The on-chip reclocker attenuates high-frequency jitter and fully regenerates the data using a clean, low-jitter clock. The reclocker has a built-in loop filter and does not require any input reference clock. The LMH0397 also has an internal eye opening monitor and a programmable pin for CDR lock indication, input carrier detect, or hardware interrupts to support system diagnostics and 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.
