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General description

The TDA18250 is a silicon tuner IC designed specifically for high definition cable Set-Top

Boxes (STB) supporting single streaming.

Used in conjunction with a digital channel demodulator, the TDA18250 covers all

worldwide digital cable standards.

? The TDA18250 ensures a low system cost as:

– Costly components such as low-noise amplifiers, Surface Acoustic Wave (SAW)

filters are eliminated from the system BOM

? The TDA18250 high-performance silicon tuner meets today’s digital cable TV

reception needs with:

– Low power consumption

– High linearity

– Low noise figure

? The TDA18250 ensures ease of use with:

– Easy on-board integration

– Efficient and effective PCB design

– Reduced external components

Features and benefits

? RF frequency coverage up to 1002 MHz

? Integrated wideband gain control

? LOW IF (LIF) output

? Single 3.3 V power supply

? Low power consumption

? Multistandard cable receptions

? Fully integrated IF selectivity, eliminating the need for external SAW filters

? RF Loop-Through (LT)

? Enhanced RF and IF filters to increase selectivity and adjacent channels filtering

? Alignment free

? Fully integrated oscillators:

? No external oscillator components for reduced cost

? 16 MHz crystal oscillator output buffer for single crystal applications

? Supports 2 tuner functions specifically aimed for PVR boxes:

? 1 ? RF output to drive slave tuner

? I2C-bus provides:

? 3.3 V microcontroller compatibility

? Received Signal Strength Indicator (RSSI) data access

? Die temperature sensor data access

? Lead-free (Pb) manufacturing