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A7302D
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General Description
A7302D is a very easy-to-use CMOS RF transmitter for sub 1GHz license free ISM band (868/915MHz). It is a FSK/ASK single chip RF transmitter with 4-steps programmable power amplifier (max 6dBm @ 868MHz). This device integrates a fully VCO and integer-N PLL synthesizer. Hence, A7302D's carrier frequency FRF is determined by the frequency of the reference crystal FXTAL. The integer-N PLL synthesizer ensures that each RF value, ranging from 863 ~ 930 MHz, where FRF = FVCO / 2, with PLL steps of 847,5KHz ( RF step = 423,75KHz when Xtal = 13,56MHz) or PLL steps of 800KHz ( RF step = 400KHz when Xtal = 12MHz) , can be achieved. This is done by using a crystal as a reference frequency according to: FRF = FXTAL x N / R, where N is the PLL feedback divider ratio and R is crystal divider to support 13,56MHz crystal.

A7302D supports FSK data rate from 1K to 20Kbps and ASK data rate from 1K to 10Kbps. In FSK modulation, this device’s Fdev (frequency deviation) is controlled by crystal detuning of series an external capacitor (typical 150pF for ± 12,5KHz ). In ASK modulation, this capacitor is not necessary.

For easy-to-use, A7302D has only two control registers, register 0 and 1. MCU can configure two registers via 3-wire SPI protocol. In addition to SPI control mode, A7302D has a special mode called HW control mode. In HW control mode, user just needs to apply pin setting. Then, radio control is done (register 0 and register 1 are in default values). No matter HW or SPI control mode, A7302D is very easy to use by a low cost MCU or encoder. Those features are all integrated in a small DFN 10 pins package.

For packet handling, there is no FIFO inside A7302D. Hence, MCU or Encoder just delivers the defined packet (preamble + sync word + payload) to TX_DATA pin for data transmitting.

 Operating range: VDD=2,2~3,6V. T=-40~+85℃.
 Small DFN10 package.
 Easy to use
 Support HW and 3-wire SPI control mode.
 HW control mode (no need MCU for radio control, default max TX power).
 Auto calibration.
 Auto start-up sequence, XtalAuto CalibrationPLL TX.
 TX current 13mA (FSK, 6dBm) / 10mA (ASK, 6dBm, 50% duty cycle).
 Shut down mode current 0,1 uA.
 Two stages class-C PA, 4-steps programmable TX Power : -4 / 0 / 3 / 6 dBm.
 Fully integrated VCO, on chip loop filter and PLL synthesizer.
 RF range from 863 ~ 930MHz with RF steps where 423,75 KHz by 13,56MHz Xtal or 400KHz by 12MHz Xtal.
 Direct ASK modulation by switching PA.
 Direct FSK modulation (frequency deviation) by crystal detuning via external capacitor.
 Support low cost crystal (13,56718MHz or 12,0052MHz with ± 50ppm tolerance).
 Very few external components: No need external IF/SAW filters.

Remote Control. ■ Wireless Toys.
■ Alarm and Security System. ■ RKE (Remote Keyless Entry).
■ Smart Energy Management ■ Garage Door Opener.
■ AMR (Auto Meter Reading) ■ Home Automation.
Datasheet
Application Note
Reference circuit design (Module)
Reference code
Evaluation kit (EK)
Development Kit (DK)
Production test tool
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