EVAL-ADF7021DB3 Datasheet PDF - Analog Devices

GENERAL DESCRIPTION
The ADF7021 is a low power, highly integrated 2FSK/3FSK/4FSK transceiver. It is designed to operate in the narrow-band, 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 narrow-band applications. It 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 ADF7021 very suitable for price-sensitive and area-sensitive 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 ADF7021 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 with a power supply range of 2.3 V to 3.6 V and can be powered down when not in use.

FEATURES
  Low power, low IF transceiver
  Frequency bands
     80 MHz to 650 MHz
     862 MHz to 940 MHz
  Modulation schemes
     2FSK, 3FSK, 4FSK
  Spectral shaping
     Gaussian and raised-cosine filtering
  Data rates supported
     0.05 kbps to 25 kbps
  2.3 V to 3.6 V power supply
  Programmable output power
     −16 dBm to +13 dBm in 63 steps
  Automatic PA ramp control
  Receiver sensitivity
     −125 dBm at 1 kbps, 2 FSK
  On-chip VCO and fractional-N PLL
  On-chip 7-bit ADC and temperature sensor
  Fully automatic frequency control loop (AFC)
  Digital RSSI
  Integrated Tx/Rx switch
  Leakage current <1 μA in power-down mode
 
APPLICATIONS
  Narrow-band standards
     ETSI EN 300-220, FCC Part 90, FCC Part 15, FCC Part 95,
     ARIB STD-T67
  Low cost, wireless data transfer
  Remote control/security systems
  Wireless metering
  Private mobile radio
  Wireless medical telemetry service (WMTS)
  Keyless entry
  Home automation
  Process and building control
  Pagers