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A7103A
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General Description
A7103A is a very easy-to-use CMOS RF transceiver for sub 1GHz license free ISM band (315/434MHz). It is a FSK/ASK single chip RF transceiver with high sensitivity receiver (-110dBm @ 2.4Kbps, 433.92MHz ASK, -106dBm @ 2.4Kbps, 433.92MHz FSK) as well as 4-steps programmable power amplifier (max. 10dBm @ 315 / 434MHz). This device integrates a double balanced image reject mixer, low IF frequency (424KHz) architecture, IF filter, I/Q limiter with RSSI generation, as well as a fully VCO and PLL synthesizer. A7103A's carrier frequency FRF is determined by the frequency of the reference Xtal FXTAL. The integer-N PLL synthesizer ensures that each RF value, ranging from 310 MHz to 315.5 MHz and 430 MHz to 438 MHz with PLL steps of 848KHz, can be achieved. This is done by using a Xtal as a reference frequency according to: FRF = FXTAL x N / 2R, where N is the PLL feedback divider ratio and R is Xtal divider to support 13.5732MHz crystal. Besides, A7103A supports AIF (Auto IF) function, user has no need to consider IF offset between TX and RX, but, use this formula ( FRF = FXTAL x N / 2R ) directly to calculate radio frequency in both TX and RX site.

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.
 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.
Remote control
Alarm and security system
Smart Energy Management
RKE(Remote Keyless Entry)
Wireless toys
Garage Door Opener
AMR (Auto Meter Reading)