New active RF splitter delivers low noise and distortion in small footprint for simultaneous TV viewing, recording, Internet access, and picture-in-picture
Norwood, MA -- Analog Devices today introduced the ADA4302-4, an active RF splitter IC that uses four-way signal-splitting technology to resolve design challenges in multi-tuner cable set-top boxes (STBs) and advanced televisions that need to simultaneously deliver video or data content to multiple applications. By dividing an input into four outputs without degrading the signal quality, the device enables low noise and distortion while reducing design work and overall system cost. rf cables
The ADA4302-4 receives one incoming analog or digital video signal, boosts its strength by 4.5 dB, divides it into four differential outputs, and delivers each to a separate tuner or modem without degrading the signal quality. Unlike solutions that rely on discrete components to split the signal and amplify power, the ADA4302-4 achieves both functions in a compact 4 x 4 mm lead frame chip-scale package (LFCSP).
The ADA4302-4 can also be configured for applications that require fewer than four outputs. Within an RF system, as the part splits a signal it strikes a unique balance between two fundamental performance trade offs -- voltage noise and harmonic distortion -- to maintain linearity. It receives downstream video channels and has a noise figure of only 4.5 dB. The device also sustains signal integrity by maintaining a CTB (composite triple beat) better than 70 dBc and a CSO better than 80 dBc.
"For cable set-top box manufacturers to achieve functionality beyond just receiving and decoding digital broadcast signals, RF system designers require advanced signal splitting technology," said Curt Ventola, product line director, Analog Devices. "For example, an STB equipped with Analog Devices' ADA4302-4 can receive one incoming signal and divide and deliver it to four tuners, or three tuners and a cable modem, enabling a consumer to simultaneously view one televised program, set a digital video recorder for recording another program, use a cable modem to access the Internet, and run picture-in-picture settings."
repeater The active splitter, fabricated on Analog Devices' advanced silicon germanium (SiGe) complementary bipolar process, is suitable for use in STB and other advanced television systems such as HDTV, as well as STV (standard definition television) display formats. It also can be integrated into televisions with built-in digital tuners and can be used in graphics and PC TV tuner cards.