RF2909

RF2909 11 Typical Applications Direct Sequence Spread Spectrum Spread Spectrum Cordless Phones Portable Battery Powered Equipment GMSK, QPSK, DQPSK, QAM Modulation 915MHz ISM Applications 3V 915MHZ SPREAD-SPECTRUM TRANSMITTER IC Product Description The RF2909 is a monolithic integrated transmitter IC capable of universal direct modulation. The quadrature modulator allows for a variety of modulation formats and compound carriers. The transmitter has two power control modes. Two inputs can be controlled digitally for stepping output power 1mW, 10mW, or 70mW output power. Or, the output level can be adjusted by an analog input from 1mW to 80mW. The quadrature mixers have differential inputs, and are internally biased; a DC blocking capacitor is required if external DC levels are present. The LO is split with a passive network tuned for 915MHz. 1 .157 .150 .033 .010 .004 .344 .337 .012 .008 .025 R F2 94 .244 .228 8°MAX 0°MIN .050 .016 .010 .008 2 .069 .053 Optimum Technology Matching® Applied ro du ct Package Style: SSOP-24 P üSi Bi-CMOS Q SIG 1 Q REF 2 GND1 3 NC 4 LO IN+ 5 LO IN- 6 NC 7 Si BJT GaAs HBT SiGe HBT GaAs MESFET Si CMOS Features 2.7V to 5V Power Supply 1mW, 10mW, 70mW Digital Output Power 20dB Analog Power Control Range Excellent Phase & Amplitude Balance Compatible with the RF2908 11 TRANSCEIVERS U pg r VCC1 8 GND2 9 VCC2 10 DC BIAS PWR CTRL Σ S ee ad ed 24 I SIG 23 I REF 22 NC +45° -45° 21 GND6 20 GND5 19 RF OUT 18 GND4 17...