TQ9222

WIRELESS COMMUNICATIONS DIVISION Vdd LNA OUT MXR LO MXR 1900 1900 1900 MXR RF 1900 TQ9222 DATA SHEET MXR IF 1900 Vdd LNA 1900 LNA IN 1900 Vdd LNA 800 LNA IN 800 Dual-Band TDMA LNA/Downconverter IC MXR IF 800 MXR RF 800 LNA OUT Vdd 800 MXR 800 MXR LO 800 Features §Pin compatible with TQ5121 §Single 3 V operation §Low-current operation §Low-frequency IF capability §Excellent ½ IF rejection §IF output combining §50 Ω matched inputs (most ports) §QSOP-24 plastic package Product Description The TQ9222 is a 3-V, RF receiver IC designed specifically for dual-band TDMA applications. Its RF performance meets the requirements of products designed to the IS-136 and GSM standards. The TQ9222 is pin compatible with TQ5121 (cellular band LNA/Mixer) which enables handset designers to use strategic board platform strategy. The TQ9222 contains two separate LNA+Mixer circuits to handle both the 800 MHz cellular band and the 1900 MHz PCS band. The mixers use a high-side LO frequency, with the IF covering a range of 70-140 MHz. IF frequencies below 120 MHz are possible due to the ½-IF spurious signal rejection in the 1900 MHz LNA+Mixer. The IF outputs are designed for use of a common IF frequency. Most RF ports are internally matched to 50Ω , greatly simplifying the design and keeping the number of external components to a minimum. Separate supply voltage connections provide the required flexibility for dual-band operation. The TQ9222 achieves good RF performance with low current consum...