DRA818V

DRA818V VHF Band Voice Transceiver Module Features:  Frequency Range: 134~174MHz  Tx/Rx frequency independent  Channel space: 12.5/25KHz  Configurable multi-channels  Sensitivity: -122dBm  Output power: +27/30dBm  CTCSS / CDCSS codes  8 volume levels  8 squelch levels  UART interface  Temperature: -20°C ~+70°C  TX current: 450/750mA  Supply voltage: 3.3~4.5V DRA818V V1.21 Applications  Portable walkie-talkie  Outdoor sports products  Audio monitor system  Building security system DESCRIPTION DRA818V is a type of compact wireless voice transceiver module based on RFIC RDA1846 and works in VHF band. It integrates high speed microcontroller, high performance wireless transceiver IC, high power PA, audio process and squelching circuits. It provides standard UART interface which users can easily configure appropriate parameters for different applications. Users can easily construct a walkie-talkie system by connecting microphone, audio PA and speaker. ANT H/L BAT PD GND H/L PA Driver PA ANT SW LDO CTC/CDC CODE LNA Filter DSP RF Transceiver AF D/A AF OUT Audio ON AMP MIC A/D MIC_IN PTT PTT RSSI UART TXD RXD Figure 1: DRA818V Functional Block Revision 1.21 Page 1 of 10 July. 2014 PIN FUNCTIONS DRA818V 12 11 18 8 7 1 Figure 2: DRA818V Pin Layout PIN Name Function Description 1 SQ Output Squelch detection.. Low Audio amplifier on 2 NC --- No connection 3 AF_OUT Output Audio output pin. 4 NC 5 PTT 6 PD 7 H/L --Input Input Inp...