In tune

Conexant Systems announced what is says is the world's first dual-stream radio frequency (RF) satellite tuner. 

The low-power, direct down conversion CX24128 is intended for high-volume set-top box (STB) receivers used for personal and digital video recording (PVR/DVR) applications, and is shipping to customers now.

The CX24128 supports 8PSK and DVB-S2 advanced modulation and coding specifications, which provide satellite operators with higher data rates and increased capacity to deliver additional high-definition television (HDTV) channels and services using existing bandwidth and infrastructure.

In addition, the device also allows manufacturers to reduce bill-of-material (BOM) costs by integrating two tuners into the single device, while saving board space and simplifying RF design layout.

Conexant says the CX24128 dual-channel tuner delivers excellent phase noise performance and very low implementation loss, which are required for advanced modulation systems such as 8PSK and DVB-S2.Key features include an architecture that provides for up to 60 decibel (dB) isolation between the device's two tuner paths for better path-to-path protection.

The CX24128 also has a built-in auto-tuning machine that accelerates calibration time and reduces software development time.

The on-chip fractional synthesisers reportedly enable fine frequency step size without adversely affecting lock time.

The CX24128 requires a single 3.3 V power supply and has an improved power supply rejection ratio (PSRR) that reduces the need for power supply conditioning components required for proper operation. An external Balun is not required, further reducing BOM costs.

The dual-channel tuner can also be used with Conexant's advanced modulation satellite demodulators to provide a complete front- and back-end system solution.

The CX24128 is packaged in a 48-pin, lead-free quad flat pack (QFN), and is priced at $8.00 in quantities of 10,000.