GS2994
The GS2994 is a high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75ohm coaxial cable.
The device is designed to support SMPTE 424M, SMPTE292M and SMPTE 259M, and is optimized for performance at 270Mbps, 1.485Gbps and 2.97Gbps.
The GS2994 features DC restoration to compensate for the DC content of SMPTE pathological test patterns.
The Carrier Detect output pin (CD) indicates whether a valid input signal has been detected. It can be connected directly to the SLEEP pin to enable automatic power-down upon loss of carrier. In the manual sleep mode, a voltage programmable threshold, which can be changed via the SQ_ADJ pin, forces CD high when the input signal amplitude falls below the threshold. This allows the GS2994 to distinguish between low-amplitude SDI signals and noise at the input of the device.
The equalizing and DC restore stages are disengaged when the BYPASS pin is HIGH. No equalization occurs in Bypass mode.
The GS2994 includes a gain selection pin (GAIN_SEL) which, when tied HIGH, compensates for 6dB flat attenuation.
The differential outputs can be DC-coupled to Gennum® 3.3V cable drivers and reclockers and to industry-standard 1.2V, 2.5V and 3.3V CML logic. In general, DC-coupling to any termination voltage between 1.2V and 3.3V is supported.
The GS2994 also includes programmable de-emphasis with three operating levels in order to support long PCB traces. The GS2994 is footprint and drop-in compatible with existing GS2974 and GS2984 designs.
The device is available in a 16-pin, 4mm x 4mm QFN package. Power consumption of the GS2994 is typically 166mW when DC-coupled at 1.2V.
The GS2994 is Pb-free, and the encapsulation compound does not contain halogenated flame retardant.
Features
- SMPTE 424M, SMPTE 292M and SMPTE 259M compliant
- Automatic cable equalization
- Multi-standard operation from 143Mbps to 2.97Gbps
- Performance optimized for 270Mbps, 1.485Gbps and 2.97Gbps. Typical equalized length of Belden 1694A cable:
- 140m at 2.97Gbps
- 200m at 1.485Gbps
- 400m at 270Mbps
- Supports DVB-ASI at 270Mbps
- Manual bypass (useful for low data rates with slow rise/fall times)
- Programmable carrier detect with squelch threshold adjustment
- Automatic power-down on loss of signal
- Standby power <30mW (typical)
- Differential output, supports DC-coupling to 1.2V -> 3.3V CML logic
- 0/6 dB gain boost selection pin • Selectable de-emphasis: 2dB, 4dB and 6dB
- Standard EIA/JEDEC logic control and status signal levels
- Single 3.3V power supply operation
- 166mW power consumption (typical)
- Wide operating temperature range of -40ºC to +85ºC
- Small footprint QFN package (4mm x 4mm)
- Footprint compatible with the GS2974 and the GS2984
- Pb-free and RoHS compliant
- SMPTE 424M, SMPTE 292M and SMPTE 259M coaxial cable serial digital interfaces
Applications
Order Codes
- GS2994-INE3: Lead-Free, RoHS Compliant, Tray-490 Pieces
- GS2994-INTE3: Lead-Free, RoHS Compliant, Tape and Reel-250 Pieces
- GS2994-INTE3Z: Lead-Free, RoHS Compliant, Tape and Reel-2500 Pieces
Pb(Lead)-Free/RoHS-Green Info
(-40°C to +85°C / 4000 cycles)
(50°C, 4000 Hrs)
Datasheets & Documentation
Explore a wealth of downloadable resources and datasheets to assist with prototyping and production.
Login or register for mySemtech to gain access to restricted product documentation and to add documents to your Watch List for update alerts
Distributor/Catalog Supplier Inventory
View product availability from participating distributors below. Browse all distributors here.
| Part # | Country | Qty | Buy | Distributor |
|---|
Resources
To see more videos Videos
In this fifth and final installment of the BlueRiver applications blog series, we’ll look at how two Semtech products lines – Semtech’s BlueRiver® ASIC platform for Pro AV and SDVoE™, and broadcast Serial Digital Interface (SDI) – can enable a unique set of “SDI-over-IP” products and applications.
BlueRiver® Applications Part 5: BlueRiver &…
READ NOW
Whether you are watching an action replay of a baseball game on a giant screen at a stadium, a movie on your large-screen TV or streaming a video on your laptop computer, a high-quality audiovisual (AV) experience is always expected. Ultra-High-Definition Serial Digital Interface (UHD-SDI) and High-Definition Multimedia Interface (HDMI) are two standards for digital AV transmission. UHD-SDI standardizes the transmission of uncompressed and unencrypted digital AV signals over coaxial or fiber optic cables. HDMI is a digital interface for transmitting high-definition, high-speed digital multi-track audio and uncompressed video signals from HDMI-compliant sources to AV displays. Even though they both can transport ultra-high-definition AV signals from a source to a display, HDMI is preferred to connect consumer gadgets such as computers, gaming consoles, Blu-ray/DVD players, televisions, projectors, etc. UHD-SDI is preferred for high-end applications such as professional indoor/outdoor video production and television broadcasts because it supports long-range transmission and a rugged connection with the help of a physical lock mechanism at each end of the cable. UHD-SDI coaxial cable can transfer signals up to 300 feet, whereas HDMI cables struggle with excessive signal degradation even within 50 feet. These two interfaces can be used together via an HDMI-SDI or SDI-HDMI converter. For example, as shown in figure 1, an HDMI display would be used for confidence monitoring of an SDI stream to avoid the need to use specially calibrated SDI-specific displays.
Circuit Protection for HDMI-SDI/SDI-HDMI…
READ NOW
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!
READ NOW