Preliminary PT4501 Sub-1 GHz Wideband FSK Transceiver DESCRIPTION The PT4501 is a highly integrated wideband FSK multi-channel half-duplex transceiver operating in sub-1 GHz license-free ISM bands. The PT4501 is supplied in a small 4 mm x 4 mm QFN-24 package, offers low power consumption, and is specified to operate in the consumer 40 C to +85 C temperature range. The receive part utilizes a fully integrated low-if architecture. Direct PLL modulation with the fractional-n synthesizer is used for FSK transmission. The device supports data rates up to 50 Kb/s in Manchester, bi-phase and other coding formats in transparent mode and provides a typical output power of +10 dbm into a 50 Ω load at 433.92 MHz, and +9 dbm at 915 MHz and achieves typical sensitivities of 113 dbm at 433.92 MHz and 110 dbm at 915 MHz for FSK data. The PT4501 is suitable for wireless applications in unlicensed (ISM) bands and requires few external components due to its high level of integration. APPLICATIONS Remote Control / Remote Sensing Remote Metering 2-Way Remote Keyless Entry Home Automation Local Telemetry Systems Wireless Modem FEATURES Carrier frequency range: 300 MHz to 960 MHz Supply voltage range: 1.9 V to 3.6 V Low current consumption: frequency band: 14.5 ma for receive-mode and 30 ma for transmit-mode (+9 dbm at 915 MHz and +10 dbm at 433.92 MHz) Programmable RF output power with 20 db power control range Programmable channel-select filter bandwidth of 200 KHz / 300 KHz / 400 KHz Excellent FSK sensitivity: 113 dbm (300 KHz channel bandwidth and 0.1% BER) at 433.92 MHz and 110 dbm 915 MHz > 25 db image-rejection Few external components 50 db range Power down function (< 1 μa current consumption in power-down mode) 4-wire SPI interface 2 separate TX and RX FIFOs (32 bytes each) QFN-24 package (4 mm 4 mm) BENEFITS Low system cost due to high system integration level Extended battery life because of the low power consumption and the minimum supply voltage down to 1.9 V Merged RF input/output matching to save the external T/R switch Single-ended RF interface with high isolation of PLL/VCO from PA and the power supply allows for easy incorporation of dipole or loop antenna Tel: 886-66296288 Fax: 886-29174598 http://www.princeton.com.tw 2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan
BLOCK DIAGRAM VRF 1 VSSLNA RXIN TXOUT 2 3 4 Image-Rejection Mixer I Q AGC Channel Select BPF Limiter FSK Modulator/ Demodulator 19 18 17 16 15 14 MOSI MISO SS GIO RFSEL XOSC 6 Regulator 7 8 9 10 11 12 XI XO CSF_ VTUNE CWTHRE 24 23 22 21 Regulator LNA 90 o I/Q Generator 0 o Frequency Synthesizer RX FIFOs Enhanced Baseband Engine Digital Control Interface PA TX FIFOs VDDTX Regulator VVCO VD VIF CE 20 13 TXRXHW PRE1.1 2 September 2014
APPLICATION CIRCUIT CE R2 C8 R1 U1 24 23 22 21 20 19 C1 1 VRF VIF CSF_ VTUNE CWTHRE CE MOSI 18 MOSI C2 L1 2 VSSLNA MISO 17 MISO ANT 3 4 RXIN TXOUT PT4501 SS GIO 16 15 SS GIO VDD_3V L2 R3 C3 L3 VDDTX 5 NC 6 VDDTX TXRXHW 13 VVCO XI XO VD RFSEL 14 C9 7 8 9 10 11 12 R4 VDDTX C10 C4 X1 C7 R5 C11 C5 C6 R6 C12 C13 BILL OF MATERIALS Part Value 315 MHz 434 MHz 470 MHz 868 MHz 915 MHz Unit C1/C4/C7/C10/C13 10n 10n 10n 10n 10n F C2 2.7p 1.5p 1.5p 1.2p 1.5p F C3 220p 220p 220p 680p 680p F C5/C6 33p/33p 33p/33p 33p/33p 33p/33p 33p/33p F C8 680p 680p 680p 680p 680p F C9 10μ 10μ 10μ 10μ 10μ F C11/C12 NC NC NC NC NC F L1 47n 39n 33n 10n 8.2n H L2 6.8n 6.8n 6.8n 5.6n 5.6n H L3 18n 22n 22n 33n 39n H R1 68K 68K 68K 68K 68K Ω R2 150K 150K 150K 150K 150K Ω R3 0 0 0 0 0 Ω R4/R5/R6 10 10 10 10 10 Ω X1 (crystal) 20 MHz U1 PT4501 IC - Notes: 1. L1/L2/L3 and C2/C3 are the components for input matching network. They may need to be adjusted for different PCB layout and antenna requirements. 2. R1 is used for adjusting the threshold voltage of carrier sense window. PRE1.1 3 September 2014
ORDER INFORMATION Valid Part Number Package Type Top Code PT4501 24 Pins, QFN PT4501 PIN CONFIGURATION VRF VSSLNA RXIN 1 2 3 TXOUT 4 NC 5 VDDTX 6 7 24 VIF CSF_ VTUNE 23 8 VVCO 22 Ground Paddle 9 XI CWTHRE 21 10 XO 11 20 CE 19 VD 12 18 MOSI 17 MISO 16 SS 15 GIO 14 RFSEL 13 TXRXHW PRE1.1 4 September 2014
PIN DESCRIPTION Pin No. Pin Name I/O Description 1 VRF P Regulated 1.8V voltage for RF domain of receive chain 2 VSSLNA G Ground for low noise amplifier (LNA) 3 RXIN I 4 TXOUT O 5 NC No connection 6 VDDTX P Receiver RF input, connected to antenna through matching circuit Transmitter RF output, connected to antenna through matching circuit External supply voltage for transmit and LO chains, 3 V input 7 P External supply voltage for analog domain, 3 V input 8 VVCO P Regulated 1.8V supply voltage for VCO 9 XI I Crystal oscillator input 10 XO O Crystal oscillator output 11 P External supply voltage for digital domain, 3 V input 12 VD P Regulated 1.8V supply voltage for digital domain 13 TXRXHW I TX/RX hardware control pin 14 RFSEL I RF frequency band (433.92/915 MHz) select pin 15 GIO I/O General purpose input/output, 3 V logic 16 SS I 4-wire SPI interface low active slave select, 3 V logic 17 MISO O 4-wire SPI interface serial data output, 3 V logic 18 MOSI I 4-wire SPI interface serial data input, 3 V logic 19 I 4-wire SPI interface serial clock, 3 V logic 20 CE I Chip-enable control pin, 3 V logic (CE = H = chip enable; CE = L = chip disable) 21 CWTHRE I/O Threshold voltage for carrier sense window 22 O Received signal strength indicator voltage 23 CSF_VTUNE I/O Tuning voltage for channel select filter 24 VIF P Regulated 1.8V voltage for analog domain of receive chain PT4501 PRE1.1 5 September 2014
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 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 Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw PRE1.1 30 September 2014