Index > Product > 2.4 GHz Short Range Devices > A7125
Selection Guide
General Description
A7125 is a high performance and low cost 2.4GHz ISM band wireless transceiver. It integrates high sensitivity receiver
(-90dBm @2Mbps), high efficiency power amplifier (up to 3dBm), frequency synthesizer and base-band modem. In typical
system, A7125 is used together with MCU (microcontroller) with very few external passive components. A7125 supports
both FIFO mode and direct mode that contains clock recovery circuit CKO pin to MCU.
A7125 supports very fast settling time (90 us) for frequency hopping system. For packet handling, A7125 has built-in
separated 64-bytes TX/RX FIFO (could be extended to 256 bytes) for data buffering and burst transmission, CRC for error
detection, FEC for 1-bit data correction per code word, RSSI for clear channel assessment, data whitening for data
encryption/decryption, thermal sensor for monitoring relative temperature. Those functions are very easy to use while
developing a wireless system. All features are integrated in a small QFN 4X4 20 pins package.
A7125’s data rate is up to 2Mbps and can be easily programmed to 1Mbps or 2 Mbps via 3-wire or 4-wire SPI bus. For
power saving, A7125 supports sleep mode, idle mode, standby mode. For easy-to-use, A7125 has an unique SPI
command set called Strobe command that are used to control A7125’s state machine. Based on Strobe commands, from
power saving, TX delivery, RX receiving, channel monitoring, frequency hopping to auto calibrations, MCU only needs to
define A7125’s control registers and send Strobe commands via SPI bus. In addition, A7125 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. Therefore, it is very easy to monitor transmission between MCU and A7125 because of its digital interface.
Small size (QFN 4X4, 20 pins).
Support 2400 ~ 2483.5 MHz ISM band.
FSK modulation.
Programmable data rate to 1Mbps or 2Mbps.
Low current consumption: RX 17mA, TX 15.7mA (at 0dBm output power).
Low sleep current (1.5uA).
Programmable RF output power -20dBm ~ 3dBm.
Very High sensitivity (-90dBm@2Mbps, -92dBm@1Mbps).
On chip regulator, supports input voltage 2.0 ~ 3.6V.
Easy to use
Support 3-wire or 4-wire SPI.
Unique Strobe command via SPI.
Change frequency channel by ONE register setting.
8-bits Digital RSSI for clear channel indication.
Fast exchange mode during TRX role switching.
Auto RSSI measurement.
Auto Calibrations.
Auto IF function.
Auto CRC Check.
Auto FEC by (7, 4) Hamming code (1 bit error correction / code word).
Data Whitening for encryption and decryption.
Separated 64 bytes RX and TX FIFO.
Easy FIFO / Segment FIFO / FIFO Extension (up to 256 bytes).
Support direct mode with recovery clock output to MCU.
Support direct mode with frame sync signal to MCU.
Support low cost crystal (6 / 8 /12 / 16MHz).
Support low accuracy crystal within ± 50ppm.
Support Auto Frequency Compensation.
Support crystal sharing, (1 / 2 / 4 / 8MHz) to MCU.
Fast settling time synthesizer for frequency hopping system.
Built-in thermal sensor for monitoring relative temperature.
Built-in Battery Detector.
2.4GHz ISM band Communication System
Wireless Intelligent sports
2.4GHz Remote Control
Wireless Toy and Gaming
Wireless Keyboard and Mouse
Wireless Audio/Video Streaming
Application Note
Reference circuit design (Module)
Reference code
Evaluation kit (EK)
Development Kit (DK)
Production test tool
*Please contact the agents or sales for more details