Product Preview PP971/1 May 2012 CMX971 Quadrature Modulator (RF Building Block) Introduction CMX971 Brief Description The CMX971 low power quadrature modulator adds to the growing range of RF Building Block ICs from CML. The CMX971 is a high performance quadrature modulator featuring a wide operating frequency range and attractive power consumption. Control of the CMX971 may be either by serial bus or by direct control (with reduced functionality). Programmable features include local oscillator divider ratio (2 or 4) and optimised operation for 3 frequency bands (low/ medium/high). Low power consumption, flexibility and high performance are key values of the RF Building Block products. The CMX971 Quadrature Modulator offers very low power consumption and high performance over the operating range of 20MHz - 1GHz. The wide 50MHz signal bandwidth at RF, 0dBm output, low noise and serial bus or direct control operation, deliver maximum flexibility and high performance all at an attractive low operating power. The small, RF-optimised VQFN package and minimal external components make the device ideal for space-constrained applications. Features Key Benefits 20MHz - 1GHz MHz RF output 0dB output level 25MHz I/Q bandwidth (50MHz bandwidth at RF) Serial bus or direct control operation Variable gain and dc offset adjustment Low power 3.0V - 3.6V operation Small 16-pin VQFN package Size is an important factor in many radio designs, the CMX971 addresses this with its availability in a very small, RF optimised 16-pin VQFN package (4mm x 4mm x 1mm). Flexible RF Building Block solution Low power consumption High performance Flexibility Low noise Small VQFN packaging Direct control option for host-less operation Simple interfacing to existing modem/ baseband products Small 16-pin VQFN TXIN TXQP TXQN CBUSOFFN Applications Wireless Data Terminals TXIP VSS HF, VHF and UHF Mobile Radio Avionics Radio Systems CSN/ FREQ2 RFOUT CBUS logic High-performance professional radios Digital wireless RFGND Divide by 2 or 4 RDATA/ DIVSET microphones SCLK/ RESETN VCC LO LOGND CDATA/ FREQ1 VDD CMX971 Function Diagram © 2012 CML Microsystems Plc 1 CMX971 Quadrature Modulator Product Preview Quadrature Modulator Quadrature (I/Q) modulation provides a number of advantages over conventional two-point modulation schemes Two-point modulation requires calibration/adjustment to achieve optimum performance I/Q modulation is the answer, providing maximum flexibility in the digital domain and allows coherent phase to be achieved An I/Q quadrature modulator provides accurate phase modulation. I/Q baseband signals are mixed up to RF by two double balanced mixers driven by the same frequency but separated in phase by 90 degrees. The outputs of the two mixers are then summed to provide the modulated output. CMX970 CMX7861 FirmCODEC® IF/RF Quadrature Demodulator Receive Processing ‘I’ In T/R Divider ‘Q’ In PA ‘Q’ Out ADC Divide by 2 or 4 DACs GPIO CMX971 Quadrature Modulator Clocks Auxiliary Systems Transmit Processing ‘I’ Out Typical system application utilising: CMX971—Quadrature Modulator CMX970—IF/RF Quadrature Demodulator CMX7861—Programmable Baseband Interface IC © 2012 CML Microsystems Plc 2 C-BUS PLLs/ VCO DSP Microcontroller CMX971 Quadrature Modulator Product Preview Evaluation Support The EV9710 is an Evaluation Kit designed for evaluating and demonstrating the capabilities of the CMX971 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 EV9710 board. A C-BUS interface connector is provided for control of the EV9710 by a host microcontroller or CML PE0002 interface card. The CMX971 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 CMX971/EV9710 serial bus. Package Mechanical Outline of the 16-pin VQFN (Q7) Order as part no. CMX971Q7 © 2012 CML Microsystems Plc 3 CMX971 Quadrature Modulator Product Preview Electrical Specification Summary Operating Limits Min Typ Max Unit Digital Supply (VDD – VSS) 3.0 - 3.6 V Analogue Supply (VCC – VRFGND) 3.0 - 3.6 V Operating Temperature -40 - +85 °C Local Oscillator Input 40 - 2000 MHz 20 - 1000 MHz Min Typ Max Unit Powersave mode - 7 - µA Bias only - 1.7 - mA Operating - 63 - mA Min Typ Max Unit Output Power (PEP) - 0 - dBm Noise Floor - -150 - dBm/Hz Equivalent Output IP3 - 21 - dBm Supply Voltage: Output Frequency Range DC Parameter - Supply Current Total Current Consumption: Quadrature Modulator 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: CMX971 FirmASIC, FirmCODEC, RALCWI, Function Image and DuraTALK are trademarks of CML Microsystems Plc. Phone: +44 (0) 1621 875500 +1 336 744 5050 +65 62 888129 800 638 5577 Fax: +44 (0) 1621 875600 +1 336 638 5577 +65 62 888230 Email Sales: [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] Email Tech Support: www.cmlmicro.com © 2012 CML Microsystems Plc Search for: cmlmicro 4