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Technical content
Low Power Super-heterodyne OOK/ASK Receiver
DESCRIPTION
The PT430 3 is a low power superheterodyne OOK/ASK receiver for the 315/433.92 MHz frequency bands. It offers a high level of integration and requires only few external components. The PT4303 consists of a low-noise amplifier (LNA), a down-conversion mixer, an on -chip phase -locked loop (PLL) with integrated voltage-controlled oscil lator (VCO) and loop filter, an OOK/ASK demodulator, a data filter, a data slicing comparator and an on -chip regulator. The PT4303 also implements a discrete one -step automatic gain control (AGC) to extend the dynamic range of the received RF signal. The PT4303 is available in a 14-pin SOP package and is specified over the extended temperature range (–40 to +85°C).
FEATURES
Ultra-low power consumption: 2.7 mA for full operation (315 MHz) Few external components Excellent sensitivity o n the order of –110 dBm (peak ASK signal level at 315 MHz) 2.4 V to 5.5 V supply voltage range 250 MHz to 500 MHz frequency range Data rate up to 10 Kb/s
APPLICATIONS
Automotive remote keyless entry (RKE) Remote control Garage door and gate openers Suitable for applications that meet either the European ETSI -300-220 or the North American FCC (Part 15) regulatory standards BLOCK DIAGRAM LNA Buffer Amplifier OOK/ASK Demodulator Data Filter (LPF) RTH PLL Reference Oscillator On-Chip Regulator VDD5 Comparator 1 2 3 4 5 6 7 IFINMIXOUT VBBVRFANTVSSRFVSSLO Mixer 14 13 12 11 10 9 8 REFOSC CTH DO CE VSSBBVLO AGC
V1.2 2 December 2013 APPLICATION CIRCUIT VSSLO1 VSSRF2 ANT3 VRF4 MIXOUT5 VBB6 IFIN7 VSSBB VDD5 8 CE 10 DO 11 CTH 12 VLO 13 REFOSC 14 PT4303-S PTC VDD5 Etched Inductor on PCB BILL OF MATERIALS Part Value Unit Description315 MHz 433.92 MHz L1 82 n 47 n H Antenna input matching, coil inductor C1 1.8 p 1.0 p F Antenna input matching C2/C4 100 n 100 n F Power supply de-coupling capacitor C3 470 n 470 n F CTH (affects coding type and start-up time) R1 8.2 M 8.2 M For reducing data output noise (optional) R2 10 10 Power supply de-coupling resistor F1 10.7 10.7 MHz Band-pass filter X1 9.509 13.226 MHz Reference crystal oscillator U1 PT4303 IC PT4303 IC U1 Receiver chip Notes: 1. L1 and C1 are the components for input matching network. Their values may need to be adjusted depending upon different PCB layout and antenna requirements. 2. The value of C3 depends upon the data rate and coding pattern. 3. F1 is the 10.7 MHz ceramic filter. The recommended part number is Murata SFELA10M7HA00-B0. 4. The “optional” components are based on application requirements.
V1.2 3 December 2013 ORDER INFORMATION Valid Part Number Package Type Top Code PT4303-S 14 Pins, SOP, 150 mil PT4303-S PIN CONFIGURATION REFOSC VLO IFIN CTH CE DO VSSLO VSSRF VBB MIXOUT ANT VDD5 VRF VSSBB PT4303-S PIN DESCRIPTION Pin Name I/O Description Pin No. VSSLO G Ground for LO portion 1 VSSRF G Ground for RF portion 2 ANT I RF input connection to antenna by a matching network 3 VRF P Supply voltage for RF portion 4 MIXOUT O Mixer IF output 5 VBB P Supply voltage for baseband chain 6 IFIN I IF stage input 7 VDD5 P 5 V supply voltage input 8 VSSBB G Ground for baseband chain 9 CE I Chip enable pin (pull HIGH to enable the chip) 10 DO O Data output 11 CTH I/O Data slicing threshold capacitor connection 12 VLO P Supply voltage for LO portion 13 REFOSC I Reference oscillator input pin 14
V1.2 15 December 2013 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry othe r than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian Dist., New Taipei City 23145, Taiwan Tel : 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw