Overview
The LMH0303SQX/NOPB, produced by Texas Instruments (not National Semiconductor, as it was acquired by Texas Instruments), is a 3-Gbps HD/SD SDI cable driver designed for high-speed serial digital video data transmission. This device supports various SMPTE standards, including ST 424, ST 292, ST 344, and ST 259. It is optimized for driving 75-Ω transmission lines at data rates up to 2.97 Gbps, making it suitable for a wide range of professional video applications.
The LMH0303 features intelligent sensing capabilities, including cable detect and loss of signal detection, which can be accessed through an SMBus interface. These features enhance system diagnostics and can activate a deep power-save mode to reduce power consumption to 4 mW.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Data Rate | Maximum data rate supported | Up to 2.97 Gbps |
| Supply Voltage | Operating supply voltage | 3.3 V |
| Output Impedance | Load impedance for output | 75 Ω |
| Output Slew Rate | Selectable slew rates for compliance with SMPTE standards | ST 259, ST 424, ST 292 |
| Output Amplitude | Adjustable output amplitude | ±10% in 5-mV steps via SMBus |
| Package Type | Physical package of the device | 16-pin WQFN |
| Power Consumption | Typical power consumption in SD and HD modes | SD: 130 mW, HD: 155 mW |
| Temperature Range | Operating temperature range | -40°C to +85°C |
Key Features
- Cable Detect and Loss of Signal Detection: The LMH0303 includes features to detect if a cable is correctly attached to the output BNC and to detect the presence of a valid signal at the input, which can activate a deep power-save mode.
- Selectable Slew Rates: Supports two selectable slew rates for compliance with SMPTE 259M and SMPTE 424M/292M standards.
- Adjustable Output Amplitude: The output amplitude is adjustable ±10% in 5-mV steps through the SMBus interface.
- SMBus Interface: Allows access to control functions through a two-wire interface, enabling communication with various system component chips.
- Multiple Device Control: Supports daisy-chaining multiple LMH0303 devices on the same SMBus, allowing dynamic address changes and shared SMBus signals.
- Power Management: Enters a deep power-save mode when the output driver is powered off, reducing power consumption to 4 mW.
Applications
The LMH0303 is designed for use in various serial digital video applications, including:
- Professional Video Equipment: Suitable for broadcast, production, and distribution equipment requiring high-speed SDI signal transmission.
- Medical Imaging: Used in medical imaging devices that require high-quality video signal transmission.
- Industrial Video Systems: Applicable in industrial settings where reliable and high-speed video data transmission is necessary.
- AV and Broadcasting Systems: Ideal for audio-visual and broadcasting systems that demand compliant SDI signal transmission.
Q & A
- What is the maximum data rate supported by the LMH0303?
The LMH0303 supports data rates up to 2.97 Gbps.
- What SMPTE standards does the LMH0303 comply with?
The LMH0303 complies with SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE 259M standards.
- How is the output amplitude adjusted on the LMH0303?
The output amplitude is adjustable ±10% in 5-mV steps via the SMBus interface.
- What is the purpose of the cable detect feature in the LMH0303?
The cable detect feature senses near-end termination to determine if a cable is correctly attached to the output BNC.
- How does the LMH0303 manage power consumption?
The LMH0303 can enter a deep power-save mode, reducing power consumption to 4 mW when the output driver is powered off.
- Can multiple LMH0303 devices be controlled on the same SMBus?
Yes, multiple LMH0303 devices can be daisy-chained on the same SMBus, allowing dynamic address changes and shared SMBus signals.
- What is the operating temperature range of the LMH0303?
The operating temperature range of the LMH0303 is -40°C to +85°C.
- What type of package is the LMH0303 available in?
The LMH0303 is available in a 16-pin WQFN package.
- How is the output slew rate controlled on the LMH0303?
The output slew rate is selectable for either SMPTE 259M or SMPTE 424M/292M compliance via the SD/HD pin or through the SMBus interface.
- What is the typical power consumption of the LMH0303 in SD and HD modes?
The typical power consumption is 130 mW in SD mode and 155 mW in HD mode.
