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3Gb/s Background
The demand for 1080p50/60 content creation is one of the key drivers for higher capacity SDI transport. In addition, there is a growing desire to produce high definition content at higher bit depths (12-bit per component) and to provide support for R'G'B' and 4:4:4:4 processing. Unfortunately, the bandwidth requirements to transmit these video formats in SDI form exceed the capabilities of a single SMPTE 292M interface.
To meet the needs for higher capacity video transport, both SMPTE (SMPTE 424M and 425M) and the ITU (ITU-R BT.1120 - 2005) have adopted the new 2.97Gb/s SDI interface.
3Gb/s Applications
- 1080p50/60 transport
- Replacement for dual-link HD-SDI
- 3D HDTV
- Digital Cinema
- Slow motion capture
3Gb/s Product Line
Gennum Corporation is first to support the industry's SMPTE424M standard with a fully compliant 3Gb/s SDI chipset called HD-LINX™ III. The chipset includes the GS2974 equalizer, GS2975 reclocker, and GS2978 cable driver.
HD-LINX™ III Benefits
- Data rates up to 2.97 Gb/s
- Backwards compatibility with HD-SDI and legacy SD-SDI
- Improved HD/SD-SDI performance in key areas such as jitter, power consumption, and return loss
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GS2974 - 3Gb/s Multi-rate Equalizer
The GS2974 is a multi-rate equalizer supporting data rates up to 2.97Gb/s signals. It is pin compatible with Gennum's existing GS1574A HD/SD Equalizer, and is designed so that existing applications can easily be upgraded to support 2.97Gb/s.
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GS2975 - 3Gb/s Tri-Rate Reclocker
The GS2975 is a tri-rate reclocker supporting 2.97Gb/s, 1.485Gb/s and 270Mb/s data rates. It is an enhanced pin compatible upgrade to the GS1575A that operates with 40% less power, serial clock output, and improved jitter performance for 1.5Gb/s applications.
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GS2975A - 3Gb/s Tri-Rate Reclocker with Dual Output
(coming soon)
The GS2975A is a superset of the GS2975 that adds a dual data output mode. It provides all of the features of the GS2975 with the added benefit of providing a second differential data output. This mode is useful for applications that require a redundant data path. Alternatively, the second output can be used as a recovered clock output. The GS2975A is fully backwards compatible with the GS2975.
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GS2978 - 3Gb/s Multi-rate Cable Driver
The GS2978 is a multi-rate cable driver supporting data rates up to 2.97Gb/s. It also has lower intrinsic jitter than previous solutions, as well as improved output return loss. The GS2978 is pin compatible with the GS1578A and includes an optional disable pin for power savings.
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