- i - typical applications features description rcr-xxx-hp low cost 315/418/433.92 mhz super-het ask/ook receiver ? remote keyless entry (rke) ? remote lighting controls ? on-site paging ? asset tracking ? wireless alarm and security systems ? long range rfid ? automated resource management ? low cost ? 150khz receiving bandwidth ? 5v operation ? 4.5ma current drain ? no external parts are required ? small size: 1.98? x 0.72? ? 4800 baud operation the rcr-xxx-hp is ideal for remote control applications where low cost and longer range are required. the receiver module requires no external rf components except for the antenna. it generates virtually no emissions, making fcc and etsi approvals easy. the super-heterodyne desi gn exhibits exceptional sensitivity and selectivit y. a saw filter can be added to the antenna input to improve selectivity for applications that require robust performance. the manufacturing-friendly sip style package and low-cost make the rcr-433-hp suitable for high volume applications.
rcr-xxx-hp super-het ask/ook receiver data sheet - 1 - 5/19/2006 document control created by steve montgomery 5/21/01 engineering review marketing review approved - engineering approved - marketing revision history revision author date description 1.0 sjm 5/21/01 document created 1.1 gwh 7/29/03 updated. 1.2 sjm 11/22/04 updated
rcr-xxx-hp super-het ask/ook receiver data sheet - 2 - 5/19/2006 mechanical drawing pinout diagram notes: 1). when designing products with the module, the designer should account for tolerances in the dimensions of the circuit board. 2). component location and spacing are subject to change . the designer should not place any components inside th e footprint of the module. absolute maximum ratings rating value units power supply and all input pins -0.3 to +12 vdc storage temperature -50 to +100 c soldering temperature (10 sec) 350 c electrical characteristics characteristic symbol min typ max units notes operating voltage v cc 4.5 5.0 5.5 vdc none operating current i cc -- 4.5 -- ma none reception bandwidth bw rx -- 150 -- khz none f c -- 315 -- mhz rcr-315-hp f c -- 418 -- mhz rcr-418-hp center frequency f c -- 433.92 -- mhz rcr-433-hp sensitivity none -- -109 -- dbm none baud rate ? nrz none 1200 -- 4800 bps none baud rate ? pwm none 120 -- 2400 bps none audio bandwidth bw audio .15 -- 2.8 khz none selectivity none tbd tbd tbd operating temperature t op -20 -- +70 c tbd
rcr-xxx-hp super-het ask/ook receiver data sheet - 3 - 5/19/2006 pin description pin name description 1 gnd receiver ground. connect to ground plane. 2 data digital data output. this output is cap able of driving one ttl or cmos load. it is a cmos compatible output. 3 v cc (5v) provides operating voltage for the receiver. vcc should be bypassed with a .01 f ceramic capacitor and filtered with a 4.7 f tantalum capacitor. noise on the power supply will degrade re ceiver sensitivity. 4 nc do not connect. 5 ant 50 ? antenna input. 6 gnd receiver ground. connect to ground plane. theory of operation super-heterodyne am detection the rcr-xxx-hp is a super-heterody ne am receiver with a built-in data slicer. the incoming am carrier is amplified and downconverted to an intermed iate frequency (if) of 10.7mhz. this if is filtered using a ceramic bandpass filter with a 150khz 3db bandwidth. the output of the if filter is then amplified and demodulated using diode detector. the output of the diode detector is the demodulated am envelope of the carrier. this signal is applied to the data slicer to generate the ttl/cmos output. data slicer the data slicer converts the baseband analog signal from the diode detector to a cmos/ttl compatible output. because the data slicer is ac coupled to the audio output, there is a minimum data rate. ac coupling also limits the minimum and maximum pulse width. typically, data is encoded on the transmit side using pulse-width mo dulation (pwm) or non-ret urn-to zero (nrz). the most common source for nrz data is from a uart embedded in a micro-controller. applications that use nrz data encoding typica lly involve microcontrolle rs. refer to the rcr- xxx-hp designer?s guide for more information on using nrz data encoding. the most common source for pwm data is from a remote control ic such as the hc-12e from holtek. data is sent as a constant rate square-wave. the duty cycle of t hat square wave will generally be either 33% (a zero) or 66% (a one). the data sl icer on the rcr-xxx-hp is optimized for use with pwm encoded data, though it will work with nrz data if certain encoding rules are followed. the data slicer is designed to drive one(1) ttl or cmos load. a buffer must be used if the data output is going to drive more than one ttl/cmos load or if the load is a lower-impedence (<100k). power supply the rcr-xxx-hp is designed to operate from a 5v power supply. it is crucial that this power supply be very quiet. the power supply should be bypassed using a 0.01uf low-esr ceramic capacitor and a 4.7 f tantalum capacitor. these capacitors should be placed as close to the power pins as possible. the rc r-xxx-hp is designed for contin uous duty operation. from the time power is applied, it can take up to 100msec for the data output to become valid.
rcr-xxx-hp super-het ask/ook receiver data sheet - 4 - 5/19/2006 antenna input pin 1 is a 50 ohm antenna input. it will sup port most antenna types, including printed antennas integrated directly onto the pcb. if a trace is longer than 1/8 th the wavelength of the frequency it is carrying, it should be a 50 ohm microstrip. ordering information product order code rcr-315-hp rcr-315-hp rcr-418-hp rcr-418-hp rcr-433-hp rcr-433-hp radiotronix inc. 905 messenger lane moore, ok 73160 (405) 794-7730 (405) 794-7477 (fax) www.radiotronix.com sales@radiotronix.com
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