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Technical content
PLL-based OOK/ASK Transmitter IC
DESCRIPTION
PT4455 is a high performance OOK/ASK transmitter for the Remote Keyless Entry (RKE) systems. It consists of a power amplifier, one-shot circuit and phase-locked loop with internal voltage controlled oscillator and loop filter. The one -shot circuit control the phase -locked loop and power amplifier to have fast start-up time in operation.
APPLICATIONS
Keyless entry systems Remote control systems Garage door openers Alarm systems Security systems Wireless sensors
FEATURES
Highly integrated OOK/ASK transmitter High output power, 3V /+11dBm /17mA Low supply voltage, 2.2V to 3.6V operation range Low external component cost. PLL-based transmitter with frequency range from 300MHz to 450MHz On-chip one-shot circuit 60dB RF on-off ratio for OOK/ASK modulation Available in 6-pin, SOT-23 package BLOCK DIAGRAM Vreg Oneshot 6 5 4 PA VSS DINVDD XOUT XIN PAOUT P L L
V1.1 2 January 2013 APPLICATION CIRCUIT XOUT1 VSS2 PAOUT3 DIN 4 VDD 5 XIN 6 PT4455 VDD R1 DIN VDD C4L2 C1 C2 BILL OF MATERIALS Part Value Unit 315MHz 433.92MHz X1 9.844M 13.56M Hz R1 10K 10K Ω R2 100K 100K Ω R3 0 0 Ω R4 0 0 Ω R5 560K 560K Ω C1 22p 18p F C2 22p 18p F C3 1μ 1μ F C4 220p 220p F C5 8.2p 4.7p F C6 18p 10p F C7 2.2μ 2.2μ F L1 180n 180n H L2 33n 27n H Notes: 1. C1/C2 can be used to trim the transmitted signal frequency for matching the specified value. 2. L2/C5/C6 value will depend on PCB layout. 3. The recommend maximum ESR value of X1 is 40Ω. 4. To populate the R5 over XIN will help to maintain good oscillation in high X1 ESR.
V1.1 3 January 2013 ORDER INFORMATION Valid Part Number Package Type Top Code PT4455 6-Pin, SOT23 PT4455 PIN CONFIGURATION PIN DESCRIPTION Pin Name I/O Description Pin No. XOUT O Oscillator output 1 VSS G Ground connection 2 PAOUT O Power amplifier output 3 DIN I Data input 4 VDD P Power supply 5 XIN I Oscillator input 6
V1.1 8 January 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 cir cuitry other 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 Te l: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw