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U3770M
CT2 I/Q Modulator and Clock Circuitry
Description
U3770M is a quadrature modulator realized ...
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...