Direct-Conversion TV Tuner
Silicon TV Tuner Saves Power, Eliminates SAW Filters
DescriptionThe MAX3580 fully integrated, direct-conversion TV tuner is designed for Digital Video Broadcasting-Terrestrial (DVB-T) applications. The integrated tuner covers a 170MHz to 230MHz input frequency range for the VHF-III band and 470MHz to 878MHz for the UHF band.
The MAX3580 direct-conversion tuner integrates an RF input switch and a multiband tracking filter, allowing low-power tuner-on-board applications without the cost and power-dissipation issues of dual-conversion tuner solutions. The zero-IF architecture eliminates the need for SAW filters by providing baseband I and Q outputs directly to the demodulator. In addition, DC-offset cancellation is implemented on-chip using a mixed-signal architecture to improve the second-order distortion performance and the dynamic range of the downstream digitizer and demodulator.
The MAX3580 features dynamic gain control of more than 76dB and a typical midband noise figure of 4.7dB referred to the LNA input. The VCO architecture optimizes both in-band and wideband phase noise for OFDM applications where sensitivity to both 1kHz phase noise and wideband phase noise related to strong adjacents can be a problem.
The MAX3580 communicates using a 2-wire serial bus. The device operates from a typical +3.3V power supply and dissipates 650mW. The MAX3580 is available in a small 32-pin thin QFN package (5mm x 5mm) with an exposed paddle.
- 650mW Power Dissipation (at VCC = +3.3V)
- I and Q Baseband Outputs Eliminate All IF-SAW Filters
- Integrated RF Tracking Filters
- Tunable Baseband Lowpass Filters
- Full-Band VHF-III and UHF Tuning
- +38dB Digital ACPR, +47dB Analog ACPR
- Low Noise Figure: 4.7dB (typ)
- Frac-N Synthesizer for -90dBc/Hz Close-In Phase Noise
- +3.1V to +3.5V Supply Voltage Range
- Ultra-Small, 5mm x 5mm Thin QFN Package
- Digital Televisions
- Digital Terrestrial Set-Tops
- Laptop Televisions
- USB Peripherals
Technical DocumentsTutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
Reference Schematic 4278 DVB-T Receiver Reference Design with the MAX3580
App Note 3700 Front-end diplex filter for MAX3580
Tutorial 808 CATV dBm, dBmV, and dBµV Conversions
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|
- 925MHz to 2175MHz Frequency Range
- Monolithic VCO
- High Dynamic Range: -75dBm to 0dBm
|Tutorial||5100||General Layout Guidelines for RF and Mixed-Signal PCBs|
|Reference Schematic||4278||DVB-T Receiver Reference Design with the MAX3580|
|App Note||3700||Front-end diplex filter for MAX3580|
|Tutorial||808||CATV dBm, dBmV, and dBµV Conversions|