FSK transceiver chip - RF12

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Datasheet:

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DESCRIPTION

Hope's RF12 is a single chip, low power, multi-channel FSK transceiver, designed for use in applications requiring FCC or ETSI conformance for unlicensed use in the 315, 433, 868 and 915 MHz bands. The RF12 transceiver features flexible, low cost, and highly integrated solution that does not require production alignments. The chip is a complete analog RF and base band transceiver including a multi-band PLL synthesizer with PA, LNA, I/Q down converter mixers, base band filters and amplifiers, and an I/Q demodulator. All required RF functions are integrated. Only an external crystal and bypass filtering are needed for operation.

The RF12 features a completely integrated PLL for easy RF design, and its rapid settling time allows for fast frequency-hopping, bypassing multi path 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 receiver base band bandwidth (BW) is programmable to accommodate various deviation, data rate and crystal tolerance requirements. The transceiver employs the Zero-IF approach with I/Q demodulation. Consequently, no external components (except crystal and decoupling) are needed in most applications.

The RF12 dramatically reduces the load on the micro controller with the integrated digital data processing features: data filtering, clock recovery, data pattern recognition, integrated FIFO and TX data register. The automatic frequency control (AFC) feature allows the use of a low accuracy (low cost) crystal. To minimize the system cost, the RF12 can provide a clock signal for the micro controller, avoiding the need for two crystals.

For low power applications, the RF12 supports low duty cycle operation based on the internal wake-up timer.

FEATURES

Fully integrated (low BOM, easy design-in)
No alignment required in production
Fast-settling, programmable, high-resolution PLL synthesizer
Fast frequency-hopping capability
High bit rate (up to 115.2 kbps in digital mode)
Direct differential antenna input/output
Integrated power amplifier
Programmable TX frequency deviation (15 to 240 KHz)
Programmable RX 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 synchron pattern recognition
SPI compatible serial control interface
Clock and reset signals for micro controller
16 bit RX Data FIFO
Two 8 bit TX data registers
Low power duty cycle mode
Standard 10 MHz crystal reference
Wake-up timer
2.2 to 5.4 V supply voltage
Low power consumption
Low standby current (0.3µA)
Compact 16 pin TSSOP package

TYPICAL APPLICATIONS

Remote control

Home security and alarm

Wireless keyboard/mouse and other PC peripherals

Toy controls

Remote keyless entry

Tire pressure monitoring

Telemetry

Personal/patient data logging

Remote automatic meter reading

Programming Guide

RF12 transceiver programming guide