L2Tek, a manufacturers’ representative and distributor of components and sub-assemblies for professional video and high-speed communications systems, has announced the Semtech GS3490 configurable and adaptive cable equalizer and cable driver IC, which delivers what is said to be the best cable-length performance currently available to the broadcast industry.
The combination of equalizer and driver in a single device can make a significant saving in design costs, in addition to saving valuable time in cable reconfiguration when end equipment is deployed in the field.
The GS3490 is aimed at equipment design for TV studios, video broadcast and outside broadcast applications, where exceptionally long cable runs are becoming increasingly common. The device is a bidirectional single-chip solution that can be field-configured via software programming as an SMPTE-compliant cable equalizer or cable driver. The GS3490’s pin-out enables switching from equalizer to driver mode via a single logic-control signal which makes the device suitable for broadcast equipment with limited I/O space, in applications where an interface connector can be configured as either an input or output.
Providing a complete solution for the transmission of both interlaced and progressive-scan digital video, the GS3490’s cable equalizer is optimized for operation at 2.97Gb/s, 1.485Gb/s and the 270Mb/s DVB-ASI standard, while providing typical cable reach of 140m at 2.97Gb/s, 250m at 1.485Gb/s and 550m at 270Mb/s. In cable driver mode, the selectable-output slew-rate capability provides compatibility for SMPTE ST 259, 292 and 424 interfaces.
Developed in conjunction with key broadcast customers, importantly the device does not integrate ‘return loss’ impedance-matching circuitry, which provides greater design flexibility for equipment developers.
Separate components can be used to match the signal throughout the system, enabling significantly better digital video performance over 75O coaxial cable.
Other features of the device include low power operation – only 206mW typical consumption in equalizer (EQ) mode and 190mW in cable driver (CD) mode. The chip also includes an integrated 100
O differential digital data I/O termination. Offered in a 5mm x 5mm QFN package, the IC operates over the -40°C to +85°C temperature range. The device is now sampling to lead customers on request.