Overview
The LMH0397RTVT from Texas Instruments is a 3G-SDI bidirectional I/O integrated circuit with an integrated reclocker. This device is designed to provide flexibility in HD-SDI video hardware designs by allowing a single BNC to be used either as an input or output port. It supports SMPTE rates up to 2.97 Gbps and is compatible with various video standards including ST-424 (3G), ST-292 (HD), and ST-259 (SD), as well as DVB-ASI and AES10 (MADI). The LMH0397 features an on-chip 75-Ω termination and return loss compensation network, ensuring compliance with stringent SMPTE return loss requirements.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VIN, VDD_CDR) | -0.5 | 2.75 | V | |
| Input Voltage for 4-Level Pins | -0.5 | 2.75 | V | |
| SMBus Input or Output Voltage (SDA, SCL) | -0.5 | 4 | V | |
| Operating Temperature Range | -40 | 85 | °C | |
| Power Dissipation (EQ Mode) | 275 | mW | ||
| Power Dissipation (CD Mode) | 290 | mW | ||
| Package Type | WQFN (32-pin), 5-mm × 5-mm |
Key Features
- User-configurable adaptive cable equalizer or cable driver with integrated reclocker
- Supports ST-424 (3G), ST-292 (HD), and ST-259 (SD) standards, as well as 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 Mbps
- On-chip 75-Ω termination and return loss compensation network
- EQ (Equalizer) Mode: adaptive cable equalizer with integrated reclocker, 100-Ω output driver with de-emphasis, reclocked 75-Ω loop-through output
- CD (Cable Driver) Mode: dual differential output cable drivers with integrated reclocker, adaptive PCB input equalizer, reclocked 100-Ω loopback output
- Automatic pre-emphasis and slew rate control on 75-Ω outputs
- Polarity inversion on 75-Ω and 100-Ω outputs
- Automatic power save in absence of input signal
- Power-down control through ENABLE pin
- Single 2.5-V supply
- 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 processing
- IP media gateway
- Digital video processing and editing
Q & A
- What is the primary function of the LMH0397RTVT?
The LMH0397RTVT is a 3G-SDI bidirectional I/O integrated circuit with an integrated reclocker, designed for use in HD-SDI video hardware.
- What video standards does the LMH0397RTVT support?
The device supports ST-424 (3G), ST-292 (HD), and ST-259 (SD) standards, as well as DVB-ASI and AES10 (MADI).
- What are the operating modes of the LMH0397RTVT?
The device can operate in EQ (Equalizer) Mode or CD (Cable Driver) Mode.
- What is the power supply requirement for the LMH0397RTVT?
The device operates on a single 2.5-V supply.
- How is the LMH0397RTVT packaged?
The device is packaged in a 5-mm × 5-mm, 32-pin WQFN package.
- What is the operating temperature range of the LMH0397RTVT?
The operating temperature range is -40°C to +85°C.
- Does the LMH0397RTVT have power-saving features?
Yes, it has automatic power save in the absence of an input signal and power-down control through the ENABLE pin.
- How can the LMH0397RTVT be programmed?
The device can be programmed through pins, SPI, or SMBus interface.
- What is the purpose of the integrated reclocker in the LMH0397RTVT?
The integrated reclocker attenuates high-frequency jitter and fully regenerates the data using a clean, low-jitter clock.
- Is the LMH0397RTVT compatible with other Texas Instruments devices?
Yes, it is pin-compatible with the LMH1297 for easy upgrade to 12G-SDI.
