Product Preview PP970/4 July 2012 CMX970 IF/RF Quadrature Demodulator (RF Building Block) Introduction CMX970 Brief Description The CMX970 is the first of a new range of RF Building Block ICs from CML. The CMX970 is a low power IF or RF quadrature demodulator featuring a wide operating frequency range and low power consumption. Suitable for architectures with IF or RF frequencies up to 300MHz, the device may be used in low IF systems or those converting down to baseband. Control of the CMX970 may be either by serial bus or direct control (with reduced flexibility). Low power consumption, flexibility and high performance are key values of the RF Building Block products. The CMX970 IF/RF Quadrature Demodulator offers very low power consumption and highperformance over the operating range of 20 - 300 MHz. The wide 10MHz I/Q bandwidth, variable gain adjustment and serial bus or direct control operation, deliver a level of flexibility and previously unavailable features, at the heart of the product. Size is an important factor in many radio designs, the CMX970 addresses this with its availability in a very small 16-pin VQFN package (4mm x 4mm x 1mm). The small, RF-optimised VQFN package and minimal external components make the device ideal for space-constrained applications. Features Key Benefits 20-300 MHz IF/RF demodulator 10MHz I/Q bandwidth Serial bus or direct control operation Variable gain and dc offset adjustment Low power 3.0 - 3.6 V operation Small 16-pin VQFN package Flexible RF Building Block solution Low power consumption High performance Flexibility Configurability with correction modes Best in class intermodulation performance Excellent phase/amplitude balance Serial bus configuration Direct control option for host-less operation Small 16-pin VQFN N/C LO LOGND CBUSOFFN Applications Wireless Data Terminals HF, VHF and UHF Mobile Radio RFGND VSS Avionics Radio Systems High-performance profes- CBUS logic sional radios CSN/ GAIN Divide 2/4 RFIN Gain Gain VCC CDATA/ RESETN RXIP RXIN RXQP RXQN VDD CMX970 Function Diagram © 2012 CML Microsystems Plc SCLK/ DIVSET 1 CMX970 IF/RF Quadrature Demodulator Product Preview Quadrature Demodulator The quadrature demodulator is designed for IF/RF operation and has very low power consumption. Input frequencies in the range 20 to 300 MHz are allowed. The demodulator system has two gain stages, one before and one after the I/Q down-converters and the gain elements can be independently controlled. This flexible architecture allows the users to optimise characteristics depending on their system requirements. Optimum noise figure can be achieved by maximising gain in first gain stage and minimising gain in the second stage. Intermodulation performance can be optimised by decreasing gain in the first or second stages. A lower gain in the second gain stage will tend to reduce dc offsets in the output I/Q signal. Further detailed information on the effects of controlling gain stages is available in the CMX970 datasheet. CMX7861 FirmCODEC® CMX970 RF Receiver Receive Processing ‘I’ In T/R Divider ‘Q’ In PLLs/ VCO Divider ‘Q’ Out ADC 90 DACs GPIO Clocks Auxiliary Systems PA Transmit Processing ‘I’ Out Typical system application utilising: CMX970—IF/RF Quadrature Demodulator CMX998—Cartesian Feedback Loop (CFBL) Transmitter CMX7861—Programmable Baseband Interface IC © 2012 CML Microsystems Plc 2 C-BUS CMX998 CFBL Transmitter DSP Microcontroller CMX970 IF/RF Quadrature Demodulator Product Preview Evaluation Support The EV9700 is an Evaluation Kit designed for evaluating and demonstrating the capabilities of the CMX970 integrated circuit. All the circuits necessary to demonstrate the facilities provided by the IC, such as matching circuits, power supply regulators, etc are provided on the EV9700 board. A C-BUS interface connector is provided for control of the EV9700 by a host microcontroller or CML PE0002 interface card. The CMX970 can also be used in a ‘direct control’ mode, where a host or PE0002 is not required. Alternatively any microcontroller evaluation/emulator kit can be used to drive the CMX970/EV9700 serial bus. Package Mechanical Outline of the 16-pin VQFN (Q7) Order as part no. CMX970Q7 © 2012 CML Microsystems Plc 3 CMX970 IF/RF Quadrature Demodulator Product Preview Electrical Specification Summary Operating Limits Min Typ Max Unit Digital Supply (VDD – VSS) 3.0 3.3 3.6 V Analogue Supply (VCC – VRFGND) 3.0 3.3 3.6 V Operating Temperature -40 - +85 °C Local Oscillator Input 40 - 500 MHz RF/IF Input 20 - 300 MHz Min Typ Max Unit Powersave mode - 10 - µA Bias only - 1.5 - mA Operating - 15 - mA Min Typ Max Unit Gain - 56 - dB(V/V) Noise figure - 10 - dB Third order intercept point (input) - -15 - dBm Supply Voltage: DC Parameter - Supply Current Total Current Consumption: IF/RF Amplifier and Quadrature Demodulator Performance Figures: Comprehensive technical datasheet and support material is available from the CML website. Click here to link to the CML website or search for: CMX970 FirmASIC, FirmCODEC, RALCWI, Function Image and DuraTALK are trademarks of CML Microsystems Plc. 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