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IA4320 Universal ISM Band e FSK Receiver Sh
DESCRIPTION
Integration’s IA4320 is a single chip, low power, multi-channel FSK receiver designed for use in applications requiring FCC or ETSI conformance for unlicensed use in the 315, 433, 868, and 915 MHz bands. Used in conjunction with IA4220/21, Integration Associates’ FSK transmitters, the IA4320 is a flexible, low cost, and highly integrated solution that does not require production alignments. All required RF functions are integrated. Only an external crystal and bypass filtering are needed for operation.
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WIRELESS
DATASHEET
IA4320
PIN ASSIGNMENT
FCS0 FBS0 FBS1 OUT0 OUT1 OUT2 OUT3 LPDM FCS3 FCS2 VDD IN1 IN2 VSS FCS1 XTL
SDI SCK nSEL FFIT/SDO nIRQ DATA/nFFS DCLK/CFIL/FFIT CLK VDI ARSSI VDD IN1 IN2 VSS nRES XTL
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The IA4320 has a completely integrated PLL for easy RF design, and its rapid settling time allows for fast frequency hopping, bypassing multipath fading, and interference to achieve robust wireless links. The PLL’s high resolution allows the usage of multiple channels in any of the bands. The baseband bandwidth (BW) is programmable to accommodate various deviation, data rate, and crystal tolerance requirements. The receiver employs the Zero-IF approach with I/Q demodulation, therefore no external components (except crystal and decoupling) are needed in a typical application. The IA4320 is a complete analog RF and baseband receiver including a multi-band PLL synthesizer with an LNA, I/Q down converter mixers, baseband filters and amplifiers, and I/Q demodulator. The chip dramatically reduces the load on the microcontroller with integrated digital data processing: data filtering, clock recovery, data pattern recognition and integrated FIFO. The automatic frequency control (AFC) feature allows using a low accuracy (low cost) crystal. To minimize the system cost, the chip can provide a clock signal for the microcontroller, avoiding the need for two crystals.
Standalone Mode
For simple applications, the receiver supports a standalone operation mode. This allows complete data receiver operation and control of four digital outputs based on the incoming data pattern without a microcontroller. In this mode, 12 or more predefined frequency channels can be used in any of the four bands. For low power applications, the device supports low duty-cycle operation based on the internal wake-up timer.
BLOCK DIAGRAM
MIX
I
AMP
IN1 13 LNA IN2 12 MIX Q
PLL & I/Q VCO with cal. RF Parts
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WTM with cal.
AMP
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OC LBD
OC
Self cal.
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RSSI 15
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COMP 1 2 3
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AFC
S a
Data Filt CLK Rec FIFO
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7 DCLK/ CFIL/ FFIT/ OUT2 DATA/ nFFS/ OUT2
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FEATURES
clk I/Q Demod. data 6
DQD
Fully integrated (low BOM, easy design-in) No alignment required in production Fast settling, programmable, high-resolution PLL Fast frequency hopping capability High bit rate (up to 115.2 kbps in digital mode and 256 kbps in analog mode) Direct differential antenna input Programmable baseband bandwidth (67 to 400 kHz) Analog and digital RSSI outputs Automatic frequency control (AFC) Data quality detection (DQD) Internal data filtering and clock recovery RX pattern recognition SPI compatible serial control interface Clock and reset signals for microcontroller 16 bit RX data FIFO Standalone operation mode without microcontroller Low power duty-cycle mode (less than 0.5 mA average supply current) Standard 10 MHz crystal reference Alternative OOK support Wake-up timer Low battery detector 2.2 to 5.4 V supply voltage Low power consumption (~9 mA in low bands) Low standby current (0.3 µA) Compact 16-pin TSSOP package
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See back page for ordering information.
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Microcontroller Mode
BB Amp/Filt./Limiter
Data processing units
TYPICAL APPLICATIONS
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CLK div
Xosc
Controller
Bias
Low Power parts
8 CLK/ LPDM
9 XTL
4
5 nIRQ/ OUT1
16 VDI/ FCS3
10 nRES/ FCS1
11
14
ARSSI/ SDI/ FCS2 FCS0
SCK/ nSEL/ FFIT/ FBS0 FBS1 SDO/ OUT0
VSS VDD
Remote control Home security and alarm Wireless keyboard/mouse and other PC peripherals Toy control Remote keyless entry Tire pressure monitoring Telemetry Personal/patient data logging Remote automatic meter reading
IA4320-DS Rev 1.29r 1005
PRELIMINARY
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www.integration.com
IA4320
DETAILED DESCRIPTION
General
The IA4320 FSK receiver is the counterpart of the IA4220 FSK transmitter. It covers the unlicensed frequency bands at 315, 433, 868, and 915 MHz. The device facilitates compliance with FCC and ETSI requirements. The programmable PLL synthesizer determines the operating frequency, while preserving accuracy based on the on-chip crystal-controlled reference oscillator. The PLL’s high resolution allows for the use of multiple channels in any of the bands. The receiver employs the Zero-IF approach with I/Q demodulation, allowing the use of a minimal number of external components in a typ.