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RF tuners handle digital radio, mobile TV

Posted: 15 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:RF tuners? triple-band dual-mode tuners? MAX2170? MAX2171?

Maxim's MAX2170/MAX2171 RF tuners

Maxim Integrated Products rolled out the MAX2170/MAX2171 RF tuners for triple-band, dual-mode mobile TV and digital radio. The devices receive VHF band-III and L-band broadcasts, as well as FM.

Each device can receive DAB and T-DMB with a minimum of external components. The low-noise, L-band front-end (3dB noise figure) eliminates the need for an external low-noise amplifier circuit, reducing both system cost and size. When tuning VHF frequencies, the on-chip tracking filter rejects out-of-band interference. This tracking filter also doubles as an FM band-select filter, said the company.

The MAX2170/MAX2171 operate from a 2.7V to 3.3V supply and draw 150mW (typ) in L-band low-power mode. The devices contain all necessary blocks to implement a low-IF TV/radio tuner, except a crystal and the (optional) L-band filtering required by some applications. The devices achieve a sensitivity of -101dBm at L-band, -99dBm at VHF and -109dBm at FM.

Both the MAX2170 and MAX2171 operate off of a 24.576MHz crystal. The devices only differ in terms of the R-divider ratio of the frequency synthesizer. MAX2170 has a fixed divide-by-1 ratio, while MAX2171 R-divider value is 3.

The MAX2170/MAX2171 operate over the -40C to 85C temperature range and are available in 6-by-6mm, 40-pin QFN packages. Prices start at $6 for 1000-unit quantities.

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