A7103A supports ASK data rate from 1K to 10Kbps and FSK from 1K to 20Kbps which is determined via external capacitors applied on data filter and data slicer. In FSK modulation, this device’s Fdev (frequency deviation) is controlled by Xtal detuning of series an external capacitor (typical 75pF for ± 12.5KHz ). However, this capacitor is not necessary in ASK modulation.

For easy-to-use, A7103A has only two control registers, register 0 and 1. MCU can configure two registers via 3-wire SPI bus. In addition to SPI control mode, A7103A has a special mode called HW control mode. In HW control mode, user just needs to apply pin settings. Then radio control is done (register 0 and register 1 are in default values). No matter HW or SPI control mode, A7103A is very easy to use by a low cost MCU or encoder/decoder. Those features are all integrated in a small SSOP 24 pins package.

For packet handling, there is no FIFO inside A7103A. Hence, in TX mode, MCU or Encoder just delivers the defined packet (preamble + sync word + payload) to TX_DATA pin. Then, in RX mode, MCU or Decoder can receive the packet (preamble + sync word + payload) from RX_DATA pin. Be aware that A7103A needs different preamble formats between ASK and FSK in order to get the best RX sensitivity.


Features:

FSK Operating range: VDD=2,2~3,3V. T=-40~+85℃.
ASK Operating range: VDD=2,2~3,0V. T=-40~+85℃.
Easy to use
HW or 3-wire SPI control mode selection.
HW control mode (no need MCU for radio control, default max TX power).
Auto calibration.
Auto start-up sequence, XtalAuto CalibrationPLL RX / TX.
TX current 18mA (FSK, 10dBm) / 11mA (ASK, 10dBm, 50% duty cycle).
RX current 9mA (FSK and ASK).
Shut down mode current 0,5 uA.
Two stages PA in class-C, 4-steps programmable TX Power : 2 / 5 / 8 / 10 dBm.
High ASK RX sensitivity down to – 110 dBm at BER<1E-3 (2.4Kbps, 433.92MHz).
High FSK RX sensitivity down to – 106 dBm at BER<1E-3 (2.4Kbps, 433.92MHz).
Customized digital I/O level (2,0 ~ 3,6V) by VIO pin.
Fully integrated VCO, on chip loop filter and PLL synthesizer.
Integrated IF Filter = mid. (250KHz in ASK, 150KHz in FSK).
Tunable data filter via external capacitors depending on data rate.
Tunable data slicer via an external capacitor depending on data rate.
Direct ASK modulation by switching PA.
Direct FSK modulation (frequency deviation) by Xtal detuning via external capacitor.
Support low cost Xtal (13.5732MHz with ± 50ppm tolerance).
Analog RSSI output. 


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