The TRF1500 is a dual-band/dual-mode Personal Communications System (PCS) receiver for cellular telephones operating dual mode (analog and digital) in the 800 MHz band and single mode (digital) in the 1900 MHz band. The TRF1500 consists of a Low Noise Amplifier (LNA) and mixer for each band. For image rejection, the low-band receiver relies on an off-chip image rejection Filter between the LNA and mixer while the high- band receiver uses an image rejection mixer. The device operates from a single 3.75 volt supply and is controlled by six digital CMOS control lines. The digital control offers a wide range of control states, including a sleep mode where the device typically draws less than 5A. Additionally, the local Oscillator (LO) inputs have buffered outputs that CAN be used in either single-ended or differential mode for a phase-locked-loop (PLL) configuration. A state is also available that allows the low-band LO to serve as the high-band LO through a mode-selectable frequency doubler. A wide-band mixer is also available for transmit loop architectures which are commonly used in advanced mobile phone systems, global systems for mobile Communications and other digital systems. The TRF1500 is available in a 48-pin plastic thin quad flatpack package and is characterized for operation from -40C to 85C operating free-air temperature. By Texas Instruments
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