GS1679
Not recommended for new designs.
Please use the GS2989 for new designs.
The GS1679 is a high-speed BiCMOS integrated circuit designed to drive one to four 75Ω coaxial cables. The GS1679 can drive data rates up to 1.485Gbps, and provides two selectable slew rates in order to achieve compliance to SMPTE 292M, SMPTE 259M and SMPTE 344M.
The GS1679 accepts industry-standard differential input levels, including LVPECL and CML. The DISABLE1 and DISABLE2 pins power-down the first and second output drivers respectively, leaving the serial data output in a high-impedance state. The GS1679 features an adjustable output swing using an external bias resistor. The single-ended output swing is adjustable from 600mVpp to 1200mVpp. The GS1679 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 GS1679 is forward footprint-compatible with the Gennum® 3G GS2989, allowing for an easier migration of HD designs to 3G.
Features
- SMPTE 292M, SMPTE 259M and SMPTE 344M compliant
- Supports data rates from 270Mbps to 1.485Gbps
- Supports DVB-ASI at 270Mbps
- Dual differential coaxial-cable-driving outputs
- selectable slew rates
- adjustable output swing from 600mVpp to 1200mVpp
- DISABLE control
- Wide common-mode range input buffer
- 100mV sensitivity
- Supports DC-coupling to industry-standard differential logic
- on-chip 100Ω differential data input termination
- 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)
- Pb-free and RoHS compliant
- Forward pin-compatible with Gennum's 3G GS2989
- 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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