GENERAL DESCRIPTION

The ADF7021-N is a high performance, low power, narrow band transceiver based on the ADF7021. The ADF7021-N has IF filter bandwidths of 9 kHz, 13.5 kHz, and 18.5 kHz, making it ideally suited to worldwide narrowband standards and particularly those that stipulate 12.5 kHz channel separation.

It is designed to operate in the narrow-band, license-free ISM bands and in the licensed bands with frequency ranges of 80 MHz to 650 MHz and 842 MHz to 916 MHz. The part has both Gaussian and raised cosine transmit data filtering options to improve spectral efficiency for narrow-band applications. It is suitable for circuit applications targeted at the Japanese ARIB STD-T67, the European ETSI EN 300 220, the Korean short range device regulations, 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-N very suitable for price-sensitive and area-sensitive applications.

FEATURES

Low power, narrow-band transceiver

Frequency bands using dual VCO

80 MHz to 650 MHz

842 MHz to 916 MHz

Programmable IF filter bandwidths of

9 kHz, 13.5 kHz, and 18.5 kHz

Modulation schemes: 2FSK, 3FSK, 4FSK, MSK

Spectral shaping: Gaussian and raised cosine filtering

Data rates supported: 0.05 kbps to 24 kbps

2.3 V to 3.6 V power supply

Programmable output power

−16 dBm to +13 dBm in 63 steps

Automatic power amplifier (PA) ramp control

Receiver sensitivity

−130 dBm at 100 bps, 2FSK

−122 dBm at 1 kbps, 2FSK

Patent pending, on-chip image rejection calibration

On-chip VCO and fractional-N PLL

On-chip, 7-bit ADC and temperature sensor

Fully automatic frequency control loop (AFC)

Digital received signal strength indication (RSSI)

Integrated Tx/Rx switch

0.1 μA leakage current in power-down mode

APPLICATIONS

Narrow-band, short range device (SRD) standards

ARIB STD-T67, ETSI EN 300 220, Korean SRD standard,

FCC Part 15, FCC Part 90, FCC Part 95

Low cost, wireless data transfer

Remote control/security systems

Wireless metering

Wireless medical telemetry service (WMTS)

Home automation

Process and building control

Pagers