NXP recently unveiled its latest silicon tuner innovation with a dual-stream RF system for both single cable and legacy satellite reception. The TDA20136 integrates a dual 8PSK satellite tuner with pre-tuner circuitry to create a single platform that delivers the flexibility to be used in diverse installation scenarios without any hardware changes.
The pre-tuner circuitry provides the flexibility that allows set-top boxes (STBs) to be used in dissimilar installation scenarios – either with a single cable input, splitting the signal internally to the device, or in legacy mode with two separated inputs. In both cases, an optional dual loop-through function is available. The most common use for the single input setting is when the set-top box is used with a single cable reception outdoor unit (ODU). In this case, signals from multiple low noise blocks (LNBs) are multiplexed onto a single cable at the ODU. This single cable can then provide the required signals for many set-top boxes in a single home or multi-dwelling unit (MDU). With no hardware changes, a set-top box using this IC can also be used in an installation with a legacy multiLNB, multicable ODU. In this legacy installation, each tuner gets its signal from a separate cable.
The TDA20136 system includes all necessary low noise amplifiers (LNAs), voltage-controlled oscillators (VCOs), synthesisers, mixers and filters required for common applications, and its small (7 x 7 mm) size allows system designers to reduce the size of front-ends.
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