The RF137 Transceiver is a highly integrated device optimized for use in singleband or multi-band Global System for Mobile Communications (GSM) applications.
In the receive path, the device consists of selectable gain Intermediate Frequency (IF) amplifiers and an image reject downconverter with differential IF outputs.

FEATUREs
• Image-reject mixer for downconversion to 2nd IF
• 24 dB selectable attenuation on 1st IF amplifier
• 12 dB selectable attenuation on 2nd IF amplifier
• Integrated transmit path with high phase accuracy
• Reduced filtering requirements for the transmit path
• Wide RF and IF range for multi-band operation
• Integrated, fully programmable dual loop synthesizer
• Integrated local oscillator phase shifters
• On-chip second local oscillator
• Low supply voltage down to 2.7 V
• Separate enable lines for transmit, receive, and synthesizer modes for power management
• 48-pin Thin Quad Flat Pack (TQFP) (7mm x 7mm) package

APPLICATIONs
• GSM900/DCS1800/PCS1900 digital cellular telephony