SA9025 Datasheet | Philips Semiconductors

INTEGRATED CIRCUITS SA9025 900 MHz transmit modulator and 2.2 GHz fractional- N synthesizer Objective specification 1997 Aug 01 Philips Semiconductors Philips Semiconductors Objective specification 900 MHz transmit modulator and 2.2 GHz fractional- N synthesizer DESCRIPTION This specification defines the requirements for a transmitter modulator and fractional- N synthesizer IC to be used in cellular telephones which employ the North American Dual Mode Cellular System (IS- 136). - Reference and clock buffers - Control logic for programming and power down modes PIN CONFIGURATION V CC GND MCLK V CC RCLK GND GND PHA PHI RN XTAL1 36 35 34 33 32 INA Features - Low current from 3.75V supply - Low phase noise - Main loop with internal charge pump and fractional pensation - 3- line serial interface bus - Power down for the synthesizers - Speedup mode for faster switching APPLICATIONS 48 47 46 45 44 43 42 1 2 41 40 39 38 37 XTAL2 TXEN DATA CLOCK LOCK STROBE GND V CC I I Q Q PHP V CC RXLO1 3 RXLO2 4 GND V CC 5 6 31 30 29 28 27 26 25 - Cellular phones - Portable battery- powered radio equipment. GENERAL DESCRIPTION The SA9025 BICMOS device...