SA1620

INTEGRATED CIRCUITS SA1620 Low voltage GSM front-end transceiver Product specification Supersedes data of 1996 Oct 08 IC17 Data Handbook 1997 May 22 Philips Semiconductors Philips Semiconductors Product specification Low voltage GSM front-end transceiver SA1620 DESCRIPTION The SA1620 is a combined receive (Rx) and transmit (Tx) front-end for GSM cellular telephones. The receive path contains two low noise amplifiers (LNA1 and LNA2) with four switchable attenuation steps. A Gilbert Cell mixer in the receive path down-converts the RF signal to a first IF of 70 to 500 MHz. A second Gilbert Cell in the transmit path transposes a GMSK or phase modulated IF to RF by image reject mixing and has a fixed IF of 400 MHz. A buffered LO signal is fed to Rx and Tx mixers. Rx or Tx path or the entire circuit may be powered-down. Feedthrough attenuation LNA1 to Rx mixer ≥ 35dB Tx power adjustable from -3 to +12dBm by external resistor Direct supply: 2.7V to 5.5V Battery supply voltage VBATT = 3.3V to 7.5V or direct supply Two DC regulators programmable for 3.0V, 3.4V, 3.7V or 5.1V Low current consumption: 28mA for Rx or 59mA for Tx Fully compatible with SA1638 GSM IF Digital I/Q circuit APPLICATIONS FEATURES Excellent noise figure: <2dB for the LNAs at 950MHz LNAs matched to 50Ω with external matching components LNAs with gain control, 59dB dynamic range in four discrete steps LNA gain stability ±0.5dB within -40 to 85°C PIN CONFIGURATION 900MHz front end f...