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Technical content
Ultra-Low Power OOK/ASK Receiver
DESCRIPTION
The PT4302 is a n ultra-low power OOK /ASK super heterodyne receiver for the 315/433.92 MHz frequency bands. It offers a high level of integration and requires only few external components. The PT4302 consists of a low-noise amplifier (LNA), a down-conversion mixer, an on -chip phase-locked loop (PLL) with integrated voltage-controlled oscillator (VCO) and loop filter, an OOK/ASK demodulator , a data filter, a data slicing comparator and an on -chip regulator. The PT4302 also implements a discrete one -step automatic gain control (AGC) that reduces the LNA gain when the RF input signal is greater than –68 dBm. The AGC circuitry can extend the dynamic range of received RF signal. The PT4302 is available in a 16-pin SSOP 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 of the ord er of –111 dBm (peak ASK signal level) 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 8 IFINMIXOUT VBBVRFANTVSSRFVSSLO Mixer 16 15 14 13 12 11 10 9 REFOSC CTH DO CE SELA SELB VSSBB Control Logic VLO AGC
V1.2 2 October 2012
433.92 MHZ RKE EXAMPLE
13.226 MHz
1.0 pF 47 nH 100 nF
10.7 MHz
V1.2 3 October 2012 APPLICATION CIRCUIT VSSLO1 VSSRF2 ANT3 VRF4 MIXOUT5 VBB6 IFIN7 VDD58 VSSBB 9 SELB 10 SELA 11 CE 12 DO 13 CTH 14 VLO 15 REFOSC 16 PTC PT4302-X VDD5 BILL OF MATERIALS Part Value Unit Description315 MHz 433.92 MHz L1 82 n 47 n H Antenna input matching, coil inductor L2 39 n 27 n H Antenna ESD protection, coil inductor (optional) C1 1.8 p 1.0 p F Antenna input matching C2, C3, C4 100 n 100 n F Power supply de-coupling capacitor C5 470 n 470 n F CTH (affects coding type and start-up time) C6 220 p 220 p F Depends on crystal oscillator vendor, for frequency fine tuning R1 10 10 Power supply de-coupling resistor (optional) R2, R3, R4, R5 10 K 10 K MCU interface resistor (optional) R6 8.2 M 8.2 M For reducing data output noise (optional) F1 10.7 10.7 MHz Band-pass filter X1 9.509 13.226 MHz Reference crystal oscillator U1 PT4302 IC PT4302 IC U1 Receiver chip Notes: 1. L1 and C1 are the components for input matching network. They may have to be adjusted with different PCB layout and antenna requirement. 2. The value of C5 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 4 October 2012 ORDER INFORMATION Valid Part Number Package Type Top Code PT4302-X 16 Pins, SSOP, 150 mil PT4302-X PIN CONFIGURATION 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 SELB I Data filter bandwidth select (Pin B) 10 SELA I Data filter bandwidth select (Pin A) 11 CE I Chip enable pin (pull HIGH to enable the chip) 12 DO O Data output 13 CTH I/O Data slicing threshold capacitor connection 14 VLO P Supply voltage for LO portion 15 REFOSC I Reference oscillator input pin 16
V1.2 18 October 2012 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