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Technical content
PLL-based OOK/ASK/FSK Transmitter IC
DESCRIPTION
PT4452 is a high performance OOK/ASK/FSK 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 controls 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/FSK transmitter High output power, 3V/+11dBm/17mA Low supply voltage, 2.4V to 3.6V operation range Low external component cost. PLL-based transmitter with frequency range from 300MHz to 450MHz On-chip one-shot circuit 60 dB RF on-off ratio for OOK/ASK modulation SOP8 package BLOCK DIAGRAM Vreg Oneshot PAOUT 8 7 6 5 432 PLL PA VSSPA DIN VDD MODSEL XOUT XIN CE
V1.0 2 December 2012 APPLICATION CIRCUIT MODSEL1 XOUT2 XIN3 CE4 VDD 5 DIN 6 VSSPA 7 PAOUT 8 PT4452X1 VDD R1 DIN VDD C4 L2 VDD EN FSKASK VDD BILL OF MATERIALS Part Value Unit 315MHz 433.92MHz X1 9.844M 13.56M Hz R1 10K 10K Ohm R2 100K 100K Ohm R3 0 0 Ohm R4 0 0 Ohm C1 22p 18p F C2 22p 18p F C3 1μ 1u 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. For FSK application to have adequate frequency deviation, and accurate carrier frequency, the crystal resonator frequency will be lower than the capacitor C1/C2 will put below 20pF to have ±50KHz pulling frequency deviation at least. 3. L2/C5/C6 value will depend on PCB layout. 4. The recommend maximum ESR value of X1 is 40Ω.
V1.0 3 December 2012 ORDER INFORMATION Valid Part Number Package Type Top Code PT4452-S 8-Pin, SOP, 150MIL PT4452-S PIN CONFIGURATION PIN DESCRIPTION Pin Name I/O Description Pin No. MODSEL I ASK/FSK modulation selection. “0”=ASK, “1”=FSK 1 XOUT O Oscillator output 2 XIN I Oscillator input 3 CE I Chip enables. “1” to enable the chip 4 VDD P Power supply 5 DIN I Data input 6 VSSPA G Power amplifier ground 7 PAOUT O Power amplifier output 8
V1.0 8 December 2012 IMPORTANT NOTICE Princeton Technology Corporatio n (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 other than cir cuitry 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