SA1620 - Philips

SA1620 Low voltage GSM front-end transceiver

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 G.

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 for GSM hand-held units
• Portable radio, TDMA systems LQFP Package PONBUF 36 35 34 33 32 31 48
  –PIN LQFP 30 29 28 27 26 25 13 14 15 16 17 18 19 20 21 22 23 24 GNDBM RxIF TxIF GND1 RxIFX GND2 TxIFX GND3 VccTx1 PONRx GNDTx1 VccTx2 GNDL1A GNDTx3 GNDTx4 GNDL1 VccL1 OUT1 RETx PDTx Tx0X TxO IN1 48 47 46 45 44 43 42 VCCL2 IN2 GNDL2 GNDL2A .