SA1638 - Philips

SA1638 Low voltage IF I/Q transceiver

The SA1638 is a combined Rx and Tx IF I/Q circuit. The receive path contains an IF amplifier, a pair of quadrature down-mixers, and a pair of baseband filters and amplifiers. A second pair of mixers in the transmit path transposes a quadrature baseband input up to the IF frequency. An external VCO signal is divided down internally and buffered to provide qua.

Features

• Fully compatible with SA1620 GSM RF front-end (see Figure 9) APPLICATIONS
• Direct supply: 3.3V to 7.5V
• Two DC regulators giving 3.0V output
• Low current consumption: 18mA for Rx or 22mA for Tx
• Input/output IF frequency from 70-400 MHz
• Internal IF PLL for synthesizing the local oscillator signal PIN CONFIGURATION
• IF circuitry for GSM 900MHz hand-held units
• IF circuitry for PCN (DCS1800) hand-held units
• Quadrature up and down mixer stage LQFP Package GNDREG1 TxIFOUTX TxIFOUT RxIF INX VccTxRx PONPLL RxIF IN VccCP GND1 GND2 GND3 48 47 46 45 44 43 42 VREG1 VREGF2 VREG2 GNDREG2 .