Overview
The LMH1297RTVT from Texas Instruments is a 12G UHD-SDI 75-Ω bidirectional I/O device with an integrated reclocker. This component is designed to provide flexibility in UHD video hardware designs by allowing a single BNC to be used either as an input or output port. It supports various SMPTE data rates up to 11.88 Gbps and features on-chip 75-Ω termination and return loss compensation, meeting stringent SMPTE return loss requirements.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | WQFN (RTV) | - |
| Pins | 32 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage | 2.5 ± 5% | V |
| Power Dissipation (Typical) | 25 mW (EQ mode: 275 mW, CD mode: 305 mW) | mW |
| Cable Reach (EQ mode, Belden 1694A) | 75 m at 11.88 Gbps, 120 m at 5.94 Gbps, 200 m at 2.97 Gbps, 300 m at 1.485 Gbps, 600 m at 270 Mbps | m |
| Supported SMPTE Rates | 11.88 Gbps, 5.94 Gbps, 2.97 Gbps, 1.485 Gbps, 270 Mbps | Gbps/Mbps |
| Interface | SPI, SMBus | - |
| Package Size | 5-mm × 5-mm | mm |
Key Features
- User-configurable adaptive cable equalizer or cable driver with integrated reclocker.
- Supports ST-2082-1 (12G), ST-2081-1 (6G), ST-424 (3G), ST-292 (HD), and ST-259 (SD) standards.
- Compatible with DVB-ASI and AES10 (MADI).
- Integrated reclocker locks to SMPTE rates up to 11.88 Gbps.
- On-chip 75-Ω termination and return loss compensation network.
- Adaptive PCB input equalizer and automatic pre-emphasis and slew rate control on 75-Ω outputs.
- Polarity inversion on 75-Ω and 100-Ω outputs.
- Automatic power save in the absence of an input signal.
- Programmable through pins, SPI, or SMBus interface.
- Internal eye opening monitor and programmable pin for CDR lock indication, input carrier detect, or hardware interrupts.
Applications
- SMPTE compatible serial digital interface.
- UHDTV/4K/8K/HDTV/SDTV video systems.
- IP media gateway.
- Digital video processing and editing.
Q & A
- What is the primary function of the LMH1297RTVT? The LMH1297RTVT is a 12G UHD-SDI 75-Ω bidirectional I/O device with an integrated reclocker, allowing it to function as either an adaptive cable equalizer or a dual cable driver.
- What are the supported SMPTE data rates? The device supports SMPTE data rates up to 11.88 Gbps, including 11.88 Gbps, 5.94 Gbps, 2.97 Gbps, 1.485 Gbps, and 270 Mbps.
- What is the operating temperature range of the LMH1297RTVT? The operating temperature range is -40°C to 85°C.
- What is the typical power dissipation of the LMH1297RTVT? The typical power dissipation is 25 mW, with 275 mW in EQ mode and 305 mW in CD mode.
- How is the device powered? The device is powered from a single 2.5-V supply.
- What interfaces are available for programming the LMH1297RTVT? The device can be programmed through pins, SPI, or SMBus interface.
- What is the package size of the LMH1297RTVT? The package size is 5-mm × 5-mm in a 32-pin QFN package.
- Does the LMH1297RTVT support polarity inversion? Yes, it supports polarity inversion on both 75-Ω and 100-Ω outputs.
- How does the device manage power in the absence of an input signal? The device has an automatic power save feature in the absence of an input signal.
- What additional monitoring features does the LMH1297RTVT have? It includes an internal eye opening monitor and a programmable pin for CDR lock indication, input carrier detect, or hardware interrupts.
