SA9024

INTEGRATED CIRCUITS SA9024 900 MHz transmit modulator and 1.3 GHz fractional–N synthesizer Objective specification 1997 Aug 01 Philips Semiconductors Philips Semiconductors Objective specification 900 MHz transmit modulator and 1.3 GHz fractional–N synthesizer SA9024 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 compensation 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 SA9024 31 30 29 28 27 26 25 Cellular phones Portable battery–powered radio equipment. GENERAL DESCRIPTION The SA9024 BICMOS device integrates: TXLO1 7 TXLO2 8 GND 9 PHS out 10 Ipeak 11 TANK1 12 Main channel synthesizer Auxiliary synthesizer Transmit offset synthesizer and oscillator I/Q modulator Power control QUICK REFERENCE DATA SYMBOL VCC ICC ICC_save fVCO fAUX fXTAL fPC Tamb PARAMETER Supply voltage Supply current Total supply current i...