GS1678
Not recommended for new designs.
Please use the GS2988 for new designs.
The GS1678 is a high-speed BiCMOS integrated circuit designed to drive one or two 75Ω coaxial cables. The GS1678 can drive data rates up to 1.485Gb/s, and provides two selectable slew rates in order to achieve compliance to SMPTE 292M, SMPTE 259M and SMPTE 344M.
The GS1678 accepts industry-standard differential input levels, including LVPECL and CML. The DISABLE pin powers-down the output driver, leaving the serial data output in a high-impedance state. The GS1678 features an adjustable output swing using an external bias resistor. The single-ended output swing is adjustable from 600mVpp to 1200mVpp. The GS1678 can be powered from either a 3.3V or a 2.5V supply. Power consumption is typically 110mW using a 2.5V power supply.
The GS1678 is footprint and drop-in compatible with existing GS1578A and LMH0002 designs, with no additional application changes required.
Features
- Pin-compatible with and replaces the LMH0002
- SMPTE 292M, SMPTE 259M and SMPTE 344M compliant
- Supports data rates from 270Mb/s to 1.485Gb/s
- Supports DVB-ASI at 270Mb/s
- Wide common-mode range input buffer
- 100mV sensitivity
- Supports DC-coupling to industry-standard differential logic
- on-chip 100? differential data input termination
- Differential coaxial-cable-driving outputs
- selectable slew rates
- adjustable output swing from 600mVpp to 1200mVpp
- DISABLE control
- Robust output signal presence function
- Excellent output eye quality
- Power supply operation at 3.3V or 2.5V
- 110mW power consumption (2.5V supply)
- Operating temperature range: -40°C to +85°C
- Small footprint QFN package (4mm x 4mm)
- Drop-in compatible with the GS1578A
- Pb-free and RoHS compliant
- Audio De-embedders
- Audio Embedders
- Camera
- Camera Control Unit
- Distribution Amplifiers
- Encoders/Decoders
- Format Detectors
- Master Control Switchers
- Monitors, Multiviewers
- Production Switchers
- Routers
- SMPTE 292M and SMPTE 259M coaxial cable serial digital interfaces
- Test and Measurement Equipment
- Up/Down/Cross Converters
- Video Capture Cards
- Video Servers
- Video Tape Recorders
Applications
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I designed my first product using the Serial Digital Interface (SDI) back in 1996, and little did I know that this fledgling coax-based video interface standard would dominate my career for the next 20+ years. Back then, SDI was limited to carrying Standard Definition (SD) digital video at 270 Megabits per second (Mbps), but would evolve to higher and higher data rates to carry High Definition 720p, 1080i and 1080p, and most recently 4K Ultra High Definition (UHD) video, at cable lengths that were not thought possible. The convenience of a low cost single conductor coaxial copper cable, capable of carrying 4K video up to 100m has meant that SDI has become the de facto AV connectivity of choice in markets such as broadcast, Pro AV, medical and surveillance.
Serial Digital Interface Is Dead: Long Live SDI!
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