Overview
The LMH0397RTVR from Texas Instruments is a 3G-SDI 75-Ω bidirectional I/O with an integrated reclocker. This device offers flexibility by allowing system designers to configure it either as an adaptive cable equalizer in input mode or as a dual cable driver in output mode. This flexibility enables the use of a single BNC port as either an input or output, simplifying HD-SDI video hardware designs. The integrated reclocker supports SMPTE data rates up to 2.97 Gbps and includes an on-chip 75-Ω termination and return loss compensation network, meeting stringent SMPTE return loss requirements.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | LMH0397RTVR |
| Package/Case | WQFN (RTV)-32 |
| Manufacturer | Texas Instruments |
| Supply Voltage | 2.5 V |
| Operating Temperature Range | –40°C to +85°C |
| Package Size | 5-mm × 5-mm |
| Number of Pins | 32 |
| Data Rates Supported | Up to 2.97 Gbps, 1.485 Gbps, or divide-by-1.001 subrates and 270 Mbps |
| Power Dissipation (Typical) | EQ Mode: 275 mW, CD Mode: 290 mW |
Key Features
- User-configurable adaptive cable equalizer or cable driver with integrated reclocker
- Supports 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 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
- Cable reach: 200 m at 2.97 Gbps, 300 m at 1.485 Gbps, 600 m at 270 Mbps (Belden 1694A, SDI_OUT Disabled)
- 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
- Programmable through pins, SPI, or SMBus interface
- Pin compatible with the LMH1297 for easy upgrade to 12G-SDI
Applications
- SMPTE-compatible serial digital interface (SDI)
- Broadcast video routers, switchers, distribution amplifiers, and monitors
- IP media gateway
- Digital video processing and editing
- UHDTV/4K/8K/HDTV/SDTV video
Q & A
- What is the primary function of the LMH0397RTVR?
The LMH0397RTVR is a 3G-SDI 75-Ω bidirectional I/O with an integrated reclocker, configurable as either an adaptive cable equalizer or a dual cable driver.
- What data rates does the LMH0397RTVR support?
The device supports SMPTE data rates up to 2.97 Gbps, 1.485 Gbps, or divide-by-1.001 subrates and 270 Mbps.
- What is the power supply requirement for the LMH0397RTVR?
The device operates on a single 2.5-V supply.
- What is the typical power dissipation of the LMH0397RTVR in EQ and CD modes?
In EQ mode, the typical power dissipation is 275 mW, and in CD mode, it is 290 mW.
- What is the operating temperature range of the LMH0397RTVR?
The operating temperature range is –40°C to +85°C.
- What package type and size does the LMH0397RTVR come in?
The device is offered in a 5-mm × 5-mm, 32-pin WQFN package.
- Is the LMH0397RTVR compatible with other Texas Instruments devices?
Yes, it is pin-compatible with the LMH1297 for easy upgrade to 12G-SDI.
- What are the key applications of the LMH0397RTVR?
The device is used in SMPTE-compatible SDI systems, broadcast video equipment, IP media gateways, and digital video processing and editing.
- How can the LMH0397RTVR be programmed?
The device can be programmed through pins, SPI, or SMBus interface.
- What are the benefits of the integrated reclocker in the LMH0397RTVR?
The integrated reclocker attenuates high-frequency jitter, fully regenerates the data using a clean, low-jitter clock, and includes a built-in loop filter without requiring an input reference clock.
