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.