DATASHEET SEARCH SITE | WWW.ALLDATASHEET.COM
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 6
Technical content
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 RSSI 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
PRE1.1 2 September 2014 BLOCK DIAGRAM AGC I Q RSSI XOSC Image-Rejection Mixer Regulator Limiter FSK Modulator/ Demodulator Channel Select BPF VSSLNA RXIN TXOUT VRF AVDD TVDD XI XO 117 109 SCLK MOSI MISO SS GIO15 RSSI CWTHRE 2122 Regulator PA LNA I/Q Generator 90o Frequency Synthesizer Regulator Enhanced Baseband Engine
23 CSF_
24 VIF
13 TXRXHW
PRE1.1 3 September 2014 APPLICATION CIRCUIT VDD_3V VDDTX TVDD C13 VSSLNA TXOUT RXIN3 VDDTX VRF
6 TXRXHW 13
CSF_ VTUNE C12 C10 C11 BILL OF MATERIALS Part Value Unit 315 MHz 434 MHz 470 MHz 868 MHz 915 MHz C1/C4/C7/C10/C13 10n 10n 10n 10n 10n 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 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 4 September 2014 ORDER INFORMATION Valid Part Number Package Type Top Code PT4501 24 Pins, QFN PT4501 PIN CONFIGURATION TVDD CE SCLK VRF 1
3 Ground
CSF_ VTUNE GIO 6VDDTX VD 12
14 RFSEL
PRE1.1 5 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 Receiver RF input, connected to antenna through matching
4 TXOUT O Transmitter RF output, connected to antenna through
5 NC — No connection
6 VDDTX P External supply voltage for transmit and LO chains, 3 V
7 AVDD 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 TVDD 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 SCLK 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 RSSI 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
PRE1.1 30 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 no tice 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