ITD1000 Datasheet | Analog Device

.. Zero-IF Tuner IC for Direct Broadcast Satellite ITD1000 Features Single chip synthesized Zero-IF tuner for satellite receiver DVB-S, DSS pliant, 950 to 2150 MHz range Low noise figure: 5 d B Operating dynamic range -75 to -10 d Bm patible with DVB variable symbol rate 1 ~ 45 Msps Ultra low power consumption: ICC < 140 m A @ 1.8 V supply Fully programmable bandwidth channel select filter: Bandwidth 5 ~ 40 MHz On chip loop through amplifier 20-bit sigma-delta fractional-N PLL exhibits 30 Hz fine frequency resolution On-chip low phase noise and wide frequency range VCO eliminates external tank circuits On-chip linear voltage regulators for single supply application No external capacitors to remove DC-offset Additional clock output for demodulator I2C serial bus interface Small 32 MLF package (5 × 5 mm2) FUNCTIONAL BLOCK DIAGRAMS Figure 1. APPLICATIONS Digital Satellite Receiver and Set-Top Boxes Digital Satellite TV Low Power Portable Satellite Receiver GENERAL DESCRIPTION The ITD1000 is a highly integrated single chip zero-IF tuner for digital broadcasting system-satellite (DBS, DVB-S, DSS). It operates from 950 to 2150 MHz for full DVB-S and DSS standard. It includes an LNA/AGC and direct conversion down mixers and PLL/VCO. A loop through amplifier is also integrated to remove additional discrete RF transistors and passive ponents. On-chip low phase noise VCO, which eliminates external tank circuits, generates In-phase and Quadrature-phase local oscillation signal for the entire frequency range. For optimized performance with variable symbol rate, baseband channel select filters are fully programmable and their cutoff frequency is digitally tuned to 5 MHz to 40 MHz. The ITD1000 also includes high dynamic range baseband variable gain amplifier. A low noise amplifier and optimized gain control scheme enable wide dynamic range operation. The ITD1000 exhibits an low power consumption about 270 m W, while conventional tuners consume over 1...