U3770M

www.DataSheet4U.com U3770M CT2 I/Q Modulator and Clock Circuitry Description U3770M is a quadrature modulator realized with MATRA MHS’ advanced 0.8 micron CMOS process. The IC is especially designed for CT2 application in conjunction with TEMIC’s RF/IF signal processor U2760B and a CT2 baseband controller (i.e., AMD PhoXTM controller Am79C4xx). Together with TEMIC’s PLL IC U2783B and the GaAs front end U7001BG, a complete CT2 chip set is available. Electrostatic sensitive device. Observe precautions for handling. Features D Programmable 0.8/1.6 MHz quadrature modulated carrier generation D More than 26 dB LO and sideband suppression D 18.432 MHz CMOS level clock generation D Supply voltage range 2.7 to 3.3 V D Low power consumption, typical 12 mW D SO16 package or die form Block Diagram RRef in 12.8 MHz 2 DIV / 25 Phase comparator 512 kHz LF 11 VCO 14 CLK out 95 9881 Amp. 3 4 13 12 10 6 5 8 7 1, 15, 16 DNC DIV / 2 or DIV / 4 6.4 MHz 3.2 MHz 512 kHz DIV / 36 18.432 MHz VDD DGND AGND PROG TST Qin QBin Iin IBin Dual DFF 9 MOD out Figure 1. Block diagram MATRA MHS Rev. A2, 03-Dec-97 1 (5) U3770M Functional Description U3770M has been designed to reduce power consumption and cost of CT2 devices. An innovative CMOS I,Q modulator with an extremely low current provides all the advantages of I,Q modulation: – No requirement for FM deviation tuning – Eliminates the Gaussian filter – Simplifies the power ramping control The modulated output carrier can be programmed to be...