Index > Product > 2.4 GHz Short Range Devices > A7205
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General Description
A7205 is a high performance and low cost 2.4GHz ISM band wireless receiver. This device integrates high sensitivity receiver (- 95dBm @ 500Kbps). In low data rate application, A7205 has special strength for long LOS (line-of-sight) distance because of its ultra high sensitivity (-107 dBm @ 2Kbps, - 104 dBm @ 25Kbps) with no requirement of external LNA. Based on Data Rate Register (0x0E), user can configure on-air data rates from 2Kbps to 500Kbps.

A7205 supports fast settling time (130 us) for frequency hopping system. For packet handling, A7205 has a built-in 64-bytes RX FIFO (could be extended to 256 bytes) for data buffering and burst transmission, CRC for error detection, RSSI for clear channel assessment, data whitening for data decryption. Those functions are very easy to use while developing a wireless system. All features are integrated in a small QFN 4X4 20 pins package.

A7205’s control registers can be easily accessed via 3-wire or 4-wire SPI. For power saving, A7205 supports sleep mode, idle mode, standby mode. For easy-to-use, A7205 has an unique SPI command set called Strobe command that are used to control internal state machine. Based on Strobe commands, MCU can control everything from power saving, RX receiving,channel monitoring, frequency hopping to auto calibrations. In addition, A7205 supports two general purpose I/O pins, GIO1 and GIO2, to inform MCU its status so that MCU could use either polling or interrupt scheme to do radio control. Hence, it is very easy to monitor radio transmission between MCU and A7205 because of its digital interface.
 Small size (QFN4 X4, 20 pins).
 Frequency band: 2400 ~ 2483.5MHz.
 FSK or GFSK modulation
 Low current consumption: RX 16mA.
 Low sleep current (1.5 uA).
 On chip regulator, support input voltage 2.0 ~ 3.6 V.
 Programmable data rate from 2Kbps to 500Kbps.
 Ultra High sensitivity:
 -95dBm at 500Kbps on-air data rate.
 -97dBm at 250Kbps on-air data rate
 -104dBm at 25Kbps on-air data rate
 -107dBm at 2Kbps on-air data rate
 Fast settling time (130 us) synthesizer for frequency hopping system.
 Built-in Battery Detector.
 Support low cost crystal (12 / 16 / 20 / 24MHz).
 Support crystal sharing, (1 / 2 / 4 / 8MHz) to MCU.
 Easy to use.
 Support 3-wire or 4-wire SPI.
 Unique Strobe command via SPI.
 ONE register setting for new channel frequency.
 8-bits Digital RSSI for clear channel indication.
 Auto RSSI measurement.
 Auto Calibrations.
 Auto IF function.
 Auto CRC Check.
 Data Whitening for packet decryption.
 64 bytes RX FIFO.
 Easy FIFO / Segment FIFO / FIFO Extension (up to 256 bytes).
 Support frame sync signal to MCU.
 Support direct mode with recovery clock output to MCU.
 2.4GHz wireless applications
 Remote control
 Helicopter and airplane radio controller
 2400 ~ 2483.5 MHz ISM system
 Wireless metering and building automation
 Wireless toys and game controllers
Application Note
Reference circuit design (Module)
Reference code
Evaluation kit (EK)
Development Kit (DK)
Production test tool
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