Highly integrated narrowband ISM transceiver
14 May 2008
Telecoms, Datacoms, Wireless, IoT
Analog Devices’ ADF7021 is a low power, highly integrated 2FSK/3FSK/4FSK transceiver, designed to operate in the narrowband, license-free ISM bands and licensed bands in the 80 MHz to 650 MHz and 862 MHz to 940 MHz frequency ranges.
It has both Gaussian and raised cosine data filtering options to improve spectral efficiency for narrowband applications.
The ADF7021 is suitable for circuit applications targeted at European ETSI-EN 300-220, the Japanese ARIB STD-T67, the Chinese Short Range Device regulations, and the North American FCC Part 15, Part 90, and Part 95 regulatory standards. A complete transceiver can be built using a small number of external discrete components, making the device suitable for price-sensitive and space-constrained applications.
The transmit section contains a voltage controlled oscillator (VCO) and a low noise fractional-N PLL with output resolution of <1 ppm. This frequency-agile PLL allows the device to be used in frequency hopping spread spectrum (FHSS) systems. The VCO operates at twice the fundamental frequency to reduce spurious emissions and frequency pulling problems.
The transmitter output power is programmable in 63 steps from -16 dBm to +13 dBm and has an automatic power ramp control to prevent spectral splatter and help meet regulatory standards. The transceiver RF frequency, channel spacing, and modulation are programmable using a simple 3-wire interface. The device operates within a power supply range of 2,3 V to 3,6 V and can be powered down when not in use.
A low IF architecture is used in the receiver (100 kHz), minimising power consumption and the external component count while avoiding interference problems at low frequencies. The IF filter has programmable bandwidths of 12,5 kHz, 18,75 kHz and 25 kHz. The ADF7021 supports a wide variety of programmable features including Rx linearity, sensitivity, and IF bandwidth, allowing the user to trade off receiver sensitivity and selectivity against current consumption, depending on the application. The receiver also features an automatic frequency control (AFC) loop with programmable pull-in range, allowing the PLL to track out the frequency error in the incoming signal.
An on-chip ADC provides read-back of an integrated temperature sensor, an external analog input, the battery voltage and the RSSI signal, which provides savings on an ADC in some applications. The temperature sensor is accurate to ±10°C over the full operating temperature range of -40°C to +85°C. This accuracy can be improved by doing a 1-point calibration at room temperature and storing the result in memory.
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