Low Power IEEE 802.15.4 Zero-IF 2.4 Transceiver IC

The ADF7241 is a highly integrated, low power, and high performance transceiver for operation in the global 2.4 GHz ISM band. It is designed with emphasis on flexibility, robustness, ease of use, and low current consumption. The IC supports the IEEE 802.15.4-2006 2.4 GHz PHY requirements in both packet and data streaming modes. With a minimum number of external components, it achieves compliance with the FCC CFR47 Part 15, ETSI EN 300 440 (Equipment Class 2), ETSI EN 300 328 (FHSS, DR > 250 kbps), and ARIB STD T-66 standards.

The ADF7241 complies with the IEEE 802.15.4-2006 2.4 GHz PHY requirements with a fixed data rate of 250 kbps and DSSS-OQPSK modulation. The transmitter path of the ADF7241 is based on a direct closed-loop VCO modulation scheme using a low noise fractional-N RF frequency synthesizer. The automatically calibrated VCO operates at twice the fundamental frequency to reduce spurious emissions and avoid PA pulling effects. The bandwidth of the RF frequency synthesizer is automatically optimized for transmit and receive operations to achieve best phase noise, modulation quality, and synthesizer settling time performance. The transmitter output power is programmable from −20 dBm to +4 dBm with automatic PA ramping to meet transient spurious specifications. An integrated biasing and control circuit is available in the IC to significantly simplify the interface to external PAs.

For more information, please refer to the data sheet.

Applications

* Wireless sensor networks

* Automatic meter reading/smart metering

* Industrial wireless control

* Healthcare

* Wireless audio/video

* Consumer electronics

* ZigBee

* Frequency range (global ISM band)

2400 MHz to 2483.5 MHz

* IEEE 802.15.4-2006-compatible (250 kbps)

* Low power consumption

19 mA (typical) in receive mode

21.5 mA (typical) in transmit mode (PO = 3 dBm)

1.7 μA, 32 kHz crystal oscillator wake-up mode

* High sensitivity

−95 dBm at 250 kbps

* Programmable output power

−20 dBm to +4.8 dBm in 2 dB steps

* Integrated voltage regulators

1.8 V to 3.6 V input voltage range

* Excellent receiver selectivity and blocking resilience

Zero-IF architecture

Complies with EN300 440 Class 2, EN300 328, FCC CFR47 Part 15, ARIB STD-T66

* Digital RSSI measurement

* Fast automatic VCO calibration

* Automatic RF synthesizer bandwidth optimization