? 2012 cml microsystems plc 1 product preview CMX970 if/rf quadrature demodulator (rf building block) CMX970 brief descripton features the CMX970 is a low power if or rf quadrature demodulator featuring a wide operatng frequency range and low power consumpton. suitable for architectures with if or rf frequencies up to 300mhz, the device may be used in low if systems or those convertng down to baseband. control of the CMX970 may be either by serial bus or direct control (with reduced fexibility). the small, rf - optmised vqfn package and minimal external components make the device ideal for space - constrained applicatons. pp970/4 july 2012 introducton the CMX970 is the frst of a new range of rf building block ics from cml. low power consumpton, fexibility and high performance are key values of the rf building block products. the CMX970 if/rf quadrature demodulator ofers very low power consumpton and high - performance over the operatng range of 20 - 300 mhz. the wide 10mhz i/q bandwidth, variable gain adjustment and serial bus or direct control operaton, deliver a level of fexibility 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 availabil- ity in a very small 16 - pin vqfn package (4mm x 4mm x 1mm). applicatons ? wireless data terminals ? hf, vhf and uhf mobile radio ? avionics radio systems ? high - performance profes- sional radios ? flexible rf building block soluton ? low power consumpton ? high performance ? flexibility ? confgurability with correcton modes ? best in class intermodulaton performance ? excellent phase/amplitude balance ? serial bus confguraton ? direct control opton for host - less operaton ? 20 - 300 mhz if/rf demodulator ? 10mhz i/q bandwidth ? serial bus or direct control operaton ? variable gain and dc ofset adjustment ? low power 3.0 - 3.6 v operaton ? small 16 - pin vqfn package key benefts small 16 - pin vqfn CMX970 functon diagram c b u s l o g i c r f g n d n / c l o l o g n d c b u s o f f n r x i n r x q p r x q n r f i n r x i p v c c v s s v d d c s n / g a i n s c l k / d i v s e t c d a t a / r e s e t n d i v i d e 2 / 4 g a i n g a i n
? 2012 cml microsystems plc 2 product preview CMX970 if/rf quadrature demodulator quadrature demodulator typical system applicaton utlising: CMX970 if/rf quadrature demodulator cmx998 cartesian feedback loop (cfbl) transmiter cmx7861 programmable baseband interface ic the quadrature demodulator is designed for if/rf operaton and has very low power consumpton. input frequencies in the range 20 to 300 mhz are allowed. the demodulator system has two gain stages, one before and one afer the i/q down - converters and the gain elements can be independently controlled. this fexible architecture allows the users to optmise characteristcs depending on their system requirements. optmum noise fgure can be achieved by maximising gain in frst gain stage and minimising gain in the second stage. intermodulaton performance can be optmised by decreasing gain in the frst or second stages. a lower gain in the second gain stage will tend to reduce dc ofsets in the output i/q signal. fu rth er detailed informaton on the efects of controlling gain stages is available in the CMX970 datasheet. c m x 9 7 0 r f r e c e i v e r c m x 7 8 6 1 f i r m c o d e c ? r e c e i v e p r o c e s s i n g c - b u s t r a n s m i t p r o c e s s i n g i i n q i n d i v i d e r c m x 9 9 8 c f b l t r a n s m i t t e r i o u t d i v i d e r q o u t t / r g p i o a d c c l o c k s d a c s a u x i l i a r y s y s t e m s d s p m i c r o c o n t r o l l e r 9 0 p l l s / v c o p a
? 2012 cml microsystems plc 3 product preview CMX970 if/rf quadrature demodulator package mechanical outline of the 16 - pin vqfn (q7) order as part no. CMX970q7 evaluaton support the ev9700 is an evaluaton kit designed for evaluatng and demonstratng the capabilites of the CMX970 integrated circuit. all the circuits necessary to demonstrate the facilites provided by the ic, such as matching circuits, power supply regulato rs, 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. alternatvely any microcontroller evaluaton/emulator kit can be used to drive the CMX970/ev9700 serial bus.
? 2012 cml microsystems plc 4 product preview CMX970 if/rf quadrature demodulator electrical specifcaton summary operatng limits min typ max unit supply voltage: digital supply ( v dd C v ss) 3.0 3.3 3.6 v analogue supply ( v cc C v rfgnd ) 3.0 3.3 3.6 v operatng temperature - 40 - +85 c local oscillator input 40 - 500 mhz rf/if input 20 - 300 mhz dc parameter - supply current min typ max unit total current consumpton: powersave mode - 10 - a bias only - 1.5 - ma operatng - 15 - ma phone: fax: email sales: email tech support: +44 (0) 1621 875500 +44 (0) 1621 875600 sales@cmlmicro.com techsupport@cmlmicro.com +1 336 744 5050 800 638 5577 +1 336 638 5577 us.sales@cmlmicro.com us.techsupport@cmlmicro.com +65 62 888129 +65 62 888230 sg.sales@cmlmicro.com sg.techsupport@cmlmicro.com www.cmlmicro.com search for: cmlmicro 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, functon image and duratalk are trademarks of cml microsystems plc. if/rf amplifer and quadrature demodulator min typ max unit performance figures: gain - 56 - db(v/v) noise fgure - 10 - db third order intercept point (input) - - 15 - dbm
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