Product Preview PP972/1 April 2013 CMX972 Quadrature Demodulator with IF PLL/VCO (RF Building Block) Introduction The CMX972 low power quadrature demodulator is part of the CML RF Building Block family of ICs. Low power consumption, flexibility and high performance are key values of the RF Building Block products. The CMX972 IF/RF Quadrature Demodulator offers very low power consumption and highperformance over the operating range of 20 - 300 MHz and includes on-chip PLL and VCO. The wide 10MHz I/Q bandwidth, variable gain adjustment and serial bus (C-BUS) control, 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 CMX972 addresses this with its availability in a very small 32-pin VQFN package (5mm x 5mm x 1mm). CMX972 Brief Description The CMX972 features a low-power quadrature IF/RF demodulator with wide operating frequency range and optimised power consumption. The demodulator is suitable for superheterodyne architectures with IF frequencies up to 300MHz and the device may be used in low IF systems or in those converting down to baseband. An on-chip PLL and VCO, together with uncommitted baseband differential amplifiers, provide additional flexibility. Control of the CMX972 is by serial bus. The small, RF-optimised 32-pin VQFN package and minimal external components make the device ideal for space-constrained applications. Features Key Benefits 20 – 300MHz IF/RF Demodulator On-chip PLL and VCO 10MHz Rx I/Q Bandwidth < 1 degree I/Q Phase Matching < 0.5 dB I/Q Gain Matching Low Power, 3.0V – 3.6V Operation Small 32-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 Simple interfacing to existing modem/ baseband products Small 32-pin VQFN Applications RXLO n/c Wireless Data Terminals HF/VHF and UHF Mobile VCO P2 VCO P1 VCO N1 VCO N2 OA1O OA1N Radio Avionics Radio Systems Software Defined Radio (SDR) Satellite Terminals High-performance radio n/c OA1P VCO 40-500MHz n/c VSS n/c CSN n/c OA2O Local oscillator switching IFIN OA2N VCC OA2P Quadrature demodulator RXIN Serial bus and control PLL RXIP RXQP RXQN n/c REFIN DO VCC CDATA SYNTH CMX972 Function Diagram © 2013 CML Microsystems Plc 1 VDD RDATA SCLK CMX972 Quadrature Demodulator with PLL/VCO 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. The inclusion of on-chip VCO and PLL reduces the overall system component count. 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 CMX972 datasheet. CMX972 CMX7861 FirmCODEC® Quadrature Demodulator with PLL/VCO Receive Processing ‘I’ In T/R Divider ‘Q’ In External Resonator and Varactors PLL GPIO Clocks Ref. C-BUS ADC DACs Auxiliary Systems VCO PLL/VCO ‘I’ Out CFBL Transmitter PA Divider ‘Q’ Out Transmit Processing CMX998 90 Typical system application utilising: CMX972 - Quadrature Demodulator with PLL/VCO CMX998 - Cartesian Feedback Loop (CFBL) Transmitter CMX7861 - FirmCODEC™ Programmable Baseband Interface IC © 2013 CML Microsystems Plc 2 DSP Microcontroller CMX972 Quadrature Demodulator with PLL/VCO Product Preview Evaluation Support The EV9720 is an Evaluation Kit designed for evaluating and demonstrating the capabilities of the CMX972 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 EV9720 board. A C-BUS interface connector is provided for control of the EV9720 by a host microcontroller or CML PE0002 interface card. Alternatively any microcontroller evaluation/emulator kit can be used to drive the CMX972/EV9720 serial bus. Package DIM. * * MIN. A B C F G H J K L L1 P T TYP. MAX. 5.00 BSC 0.80 3.00 3.00 0.00 0.18 0.20 0.30 0 5.00 BSC 0.90 0.25 1.00 3.80 3.80 0.05 0.30 0.55 0.15 0.50 0.20 NOTE : * Exposed Metal Pad A & B are reference data and do not include mold deflash or protrusions. All dimensions in mm Angles are in degrees Index Area 1 Dot Index Area 2 Dot Chamfer Index Area 1 is located directly above Index Area 2 Depending on the method of lead termination at the edge of the package, pull back (L1) may be present. L minus L1 to be equal to, or greater than 0.3mm The underside of the package has an exposed metal pad which should ideally be soldered to the pcb to enhance the thermal conductivity and mechanical strength of the package fixing. Where advised, an electrical connection to this metal pad may also be required Mechanical Outline of the 32-pin VQFN (Q5) Order as part no. CMX972Q5 © 2013 CML Microsystems Plc 3 CMX972 Quadrature Demodulator with PLL/VCO 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 Supply Voltage: 3.6 V Operating Temperature IO Supply (VDIO – VDSS) -40 1.6 - +85 °C Local Oscillator Input 40 - 500 MHz RF/IF Input 20 - 300 MHz Min Typ Max Unit DC Parameter - Supply Current Total Current Consumption: Powersave mode - 7 - µA Rx only - 15 - mA PLL and VCO - 9 - mA Min Typ Max Unit Gain - 56 - dB(V/V) Noise figure - 10 - dB Third order intercept point (input) - -15 - dBm 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: CMX972 FirmASIC, FirmCODEC, RALCWI, Function Image and DuraTALK are trademarks of CML Microsystems Plc. 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