CML Microcircuits COMMUNICATION SEMICONDUCTORS CML’s Flexible Family of RF IC Products www.cmlmicro.com Quadrature Transceiver Quadrature Receiver CMX993/W Quadrature Modulator Direct Conversion Receiver Modulation Schemes Cartesian Feedback Loop Transmitter A family of highly flexible ICs working in the RF frequency range of 100MHz to 1GHz, with the CMX993/W and CMX998 operating down to 30MHz. These ICs, singularly or in combination, address the needs of many over-air formats for data and encoded-voice operation in both constant-envelope and linear modulation systems. To reduce savings in the printed circuit board requirement, these low-power products require a basic minimum in the way of external circuitry and control and are available in compact VQFN packages. To enable the shortest design-in time, these RF products are well supported, from a customer’s project inception through to final shipping, by ready-to-use evaluation and demonstration aids in the form of populated pcbs accompanied by circuit diagrams, pcb layout masks, bill-of-material information and example scripts. CML’s website (www.cmlmicro.com) provides datasheets/user manuals, material updates, FAQs and application notes.

Introduction CML’s Growing RF Product Family This document introduces and describes CML’s expanding family of RF oriented IC products for data and encoded voice operations. Direct digital modulation is ideally suited to wireless data applications for higher speed data systems and wider channel bandwidth requirements. To pass more data over the same channel requires accurate phase modulation and introduces the need for systems working to I/Q quadrature modulation. CML’s very flexible family of low-power radio frequency ICs supports many different signal formats. These solutions offer a range of...

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CMX991 Quadrature Transceiver Core RF functions for a full-feature transmitter and receiver A high performance RF quadrature transceiver IC that provides the core baseband, IF and RF functions required to implement a full-featured radio transceiver. Operating in the range 100MHz to 1GHz, its I/Q architecture supports the inclusion of multiple modulation types and bandwidths within a single radio design. The half duplex CMX991 integrates Tx modulator, Rx demodulator and IF PLL and VCO sub-systems to minimise the external circuits required to implement the complete transceiver unit. User-selected...

CMX991 Example Auxiliary ADCs and DACs System Peripherals Transmitter Up-converter Digital Channel Filter Phase Modulator Tx In Digital Channel Filter Audio Codec C-BUS Control/Data Interface External Resonator/ Varactors Φ Digital Channel Filter I Channel 1st IF Variable Gain Amp 1st RF Mixer Phase Demodulator Rx Out Digital Channel Filter Supplies Optional 2nd Filter for Different Bandwidth Crystal/SAW IF Filter

CMX992 Quadrature/Low IF Receiver Core RF functions for a full-feature receiver The CMX992 is a single-chip, high performance, RF superheterodyne receiver IC for analogue and digital radio systems; it employs the receiver section circuitry of the CMX991 Transceiver. It operates in the RF range 100MHz to 1GHz and its I/Q architecture supports multiple modulation types and bandwidths with a single radio design. The CMX992, which includes the core RF and IF functions of a high performance receiver, can be used in a wide range of narrowband and wideband wireless products including multi-mode analogue/digital...

CMX998 CFBL Transmitter Up-converter Digital Channel Filter Audio Codec Input Amplifiers Digital Channel Filter Filter Amplifiers (optional) Error Amplifiers Phase Modulator C-BUS Control/Data Interface Phase Shift External Resonator/ PLL In Varactors C-BUS Control/Data Interface µController Digital Channel Filter Digital Channel Filter  For ease of addressing when using the CMX998 with the CMX992 or CMX994, the C‑BUS addresses of the CMX992 or CMX994 are different, arranged not to overlap and to allow common C-BUS connections Auxiliary ADCs and DACs System Peripherals Optional 2nd Filter for...

CMX993 and CMX993W Quadrature Modulators Translation from baseband I and Q up to a modulated RF signal These integrated, low voltage quadrature (I/Q) modulator ICs provide translation from baseband I and Q signals to a modulated RF signal. Both ICs, which each integrate two matched double balanced mixers driven from a buffered and quadrature split local oscillator, are suitable for use in applications operating from 30MHz to 1GHz. The LO frequency is divided by a factor of either two or four. The mixers form an I/Q vector modulator with programmable gain stages offering up to 30dB of gain, controlled...

CMX993 and CMX994 Example Auxiliary ADCs and DACs System Peripherals Digital Channel Filter C-BUS Data/Control Interface Phase Modulator Digital Channel Filter Audio Codec Optional Filter Phase Demodulator Mixer Input CMX994 Direct Conversion Receiver Digital Channel Filter Digital Channel Filter C-BUS Data/Control Interface Reference Frequency  Note that the CMX992 Quadrature Receiver could be used in place of the CMX994 Tank Circuit

CMX994 Direct Conversion Receiver (advance information) RF, I/Q demodulation and baseband circuits The CMX994 is a direct conversion receiver IC. The Direct Conversion RF architecture offers the ultimate lowest cost and small size receiver solution. The use of integrated channel filtering removes bulky and expensive external components. This CML approach also minimises local oscillator (LO) requirements. The receiver is fully integrated with a broadband Low Noise Amplifier (LNA) preceding the down-converter section, a high dynamic-range I/Q demodulator. The receiver baseband section includes...