The TQ5121 3V RFIC Down converter is designed specifically for cellular band TDMA applications. The TQ5121 contains a LNA+Mixer circuit to handle the 800 MHz cellular band. The IF frequency range covers 70 to 140 MHz with most of the ports internally matched to 50 simplifying the design and keeping the number of external components to a minimum.
The mixer uses a high-side LO frequency, with the IF covering a range of 70 to 140MHz. Most RF ports are internally matched to 50 W, greatly simplifying the design and keeping the number of external components to a minimum. The TQ5121achieves good RF performance with low current consumption, supporting longstandby times in portable applications. Coupled with the very small QSOP-16package, the part is ideally suited for Cellular band mobile phones.