SA9025 - Philips

SA9025 900 MHz transmit modulator and 2.2 GHz fractional-N synthesizer

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 .

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 SA9025 31 30 29 28 27 26 25
• Cellular phones
• Portable battery
  –powered radio equipment. GENERAL DESCRIPTION The SA9025 BICMOS device integrates: TXLO1 7 TXLO2 8 GND 9 PHS out 10 Ipeak 11 TANK1 12
• Main channel synthesizer
• Auxi.