RX-AUDIO-2.4
Contents
1. 100ms from the rising edge detected on TACT_SW input Application Circuit hi e A Lin out or Speaker For Headphone USER_BIT FOAM AT TACT _SW ao Lut high for power on E and low for mule ODE SPEAKER KOR indicator for link di we iucator Ie i Pan onnect to pin 6 or pin32 7V input av Le caratteristiche tecniche possono subire variazioni senza preavviso AUREL S p A non si assume la responsabilit di danni causati dall uso improprio del dispositivo Technical features are subject to change without notice AUREL S p A does not assume responsibilities for any damages caused by the device s misuse AUREL S p A Via Foro dei Tigli 4 47015 Modigliana FC ITALY Rev B 07 10 2009 Tel 39 0546 941124 Fax 39 0546 941660 Pag 5 di 7 SIUSI L E L RX AUDIO 2 4 User Manual P N 650201005G Notes to application circuit Q At USER_BIT pin serialized data stream max 5Kbps is available as delivered from corresponding USER_BIT pin of transmitter with no interference on digitalized audio Data examples are remote control commands or titles of musical composition being transmitted Q Input signals FORMAT pin 4 OB pin 5 ID3 ID2 ID1 IDO pins 14 to 17 function only when the used transmitter is a TX AUDIO 2 4 AE Aurel code 650201062G Those functions are NOT available when the transmitter is a TX AUDIO 2 4 Aurel code 650201004G a RX AUDIO 2 4 modules Aurel code 650201005G2. causati dall uso improprio del dispositivo Technical features are subject to change without notice AUREL S p A does not assume responsibilities for any damages caused by the device s misuse AUREL S p A Via Foro dei Tigli 4 47015 Modigliana FC ITALY Tel 39 0546 941124 Fax 39 0546 941660 Rev B 07 10 2009 Pag 7 di 7
3. delivered prior of mid 2008 use ONLY pins 1 to 20 pins 21 to 32 are NOT connected Now the Aurel code 650201004G corresponds by default to the second series of the module First series pins 1 to 20 only Second series full pin out Le caratteristiche tecniche possono subire variazioni senza preavviso AUREL S p A non si assume la responsabilit di danni causati dall uso improprio del dispositivo Technical features are subject to change without notice AUREL S p A does not assume responsibilities for any damages caused by the device s misuse AUREL S p A Via Foro dei Tigli 4 47015 Modigliana FC ITALY Rev B 07 10 2009 Tel 39 0546 941124 Fax 39 0546 941660 Pag 6 di 7 AUKEL RELESS RX AUDIO 2 4 User Manual Application information P N 650201005G Designing the transmitter module in wireless speakers and headphones must pay attention to the following considerations v Do not let any metal objects too close to antenna OO OO OO OO 00 OO OO OO OO OO OO OO OO OO OO OO Figure 1 Antenna area marked by diagonal lines v Receiver module must be kept over 3 cm away from speakers to avoid magnetic interference v Power supply to receiver module must be independent separate from the power of amplifier v Avoid to put any cable or circuit nearby antenna 1 2 cm Le caratteristiche tecniche possono subire variazioni senza preavviso AUREL S p A non si assume la responsabilit di danni
4. AUKEL RELESS User Manual RX AUDIO 2 4 RX AUDIO 2 4 P N 650201005G Features gt Non compression for high sound quality with delay time 0 5 ms gt Digital audio with 44 1 KHz sampling rate and 16 bit resolution gt FSK digital demodulation gt Embedded antenna for cost effect and fast development gt Improved performance in harsh environment by antenna diversity gt 8 selectable channels gt Low power consumption for mobile application gt To be used with 650201004G TX AUDIO 2 4 and 650201062G TX AUDIO 2 4 AE transmitter modules Specification Min Typical Max Unit Notes Supply Voltage 4 9 5 0 5 1 Voc 2 2 3 6 Voc headphones side Current Consumption 65 mA Operating temperature 10 60 C Modulation FSK Frequency range 2400 2483 5 MHz Channel number 8 Channel spacing 9 MHz Frequency stability 100 100 KHz Sensitivity 83 dBm Output impedance 12 ohm headphones side Output level 1 8 Vpp headphones side Response 20 20 000 Hz 1 Dynamic Range 92 dB 1 Separation 80 dB o SN radio 87 dB 1 Board dimensions 47 x 32 x7 mm NOTE 1 When used with TX AUDIO 2 4 650201004G Le caratteristiche tecniche possono subire variazioni senza preavviso AUREL S p A non si assume la responsabilit di danni causati dall uso improprio del dispositivo Technical features are subject to change without notice AUREL S p A does not assume responsib
5. ODE or automatic switches called TACT MODE When CH_MODE pin 18 input signal value is 0 DIP MODE is selected when it s value is a logic 1 TACT MODE is active see channel mode setting table In DIP MODE channel is selected manually by setting SW2 SW1 and SWO input signals Inputs are low active and SW2 is the most significant bit of the hexadecimal negated combination it means that a 1 1 1 configuration correspond to channel 0 at lowest frequency 1 1 0 is for the channel 1 immediately above until to 0 0 0 that select the channel 7 at higher frequency as in table below channel SW2 SW1 SWO Carrier frequency 7 0 0 0 2473 MHz 6 0 0 1 2464 MHz 5 0 1 0 2455 MHz 4 0 1 1 2446 MHz 3 1 0 0 2437 MHz 2 1 0 1 2428 MHz 1 1 1 0 2419 MHz 0 1 1 1 2410 MHz NOTE 4 SW2 SW1 and SWO inputs are internally pulled up Table 1 DIP MODE selecting channel In DIP MODE SW2 SW1 and SWO inputs are continuously monitored so is not necessary to switch values simultaneously or doing any kind of syncronization In TACT MODE is possible to change channel by the single input signal TACT_SW on pin 6 or 32 The way used to do the change depends by the settings of two more input signals TACT_SCAN pin 19 and CT_INU pin 20 The configuration of that three inputs select in which mode the channel will change after the low impulse on TACT_SW switching channel by channel un
6. d AMP _L are brought to logic level low The receiver module operates up to a lower limit voltage of 1 6 V on pin DC_IN below which it turns off To return to have a running device DC_IN must be brought to a voltage level sufficient to restart the microcontroller on board about 3V With a 5V power on Vcc input pin 7 there is no control of the supply voltage and if it drops too low below 3V none audio get out from the outputs but only a DC voltage which comes from the power supply The ripple power immunity of audio outputs signals corresponding to a voltage that varies between 2 2 and 3 6V is e 100mvVripple voltage at 100Hz with volume up to the limit generates an output variation of 10mVpp e 700mvVripple voltage at 100Hz with volume up to the limit generates an output variation of 20MVpp Le caratteristiche tecniche possono subire variazioni senza preavviso AUREL S p A non si assume la responsabilit di danni causati dall uso improprio del dispositivo Technical features are subject to change without notice AUREL S p A does not assume responsibilities for any damages caused by the device s misuse AUREL S p A Via Foro dei Tigli 4 47015 Modigliana FC ITALY Rev B 07 10 2009 Tel 39 0546 941124 Fax 39 0546 941660 Pag 3di7 AUKEL RELESS RX AUDIO 2 4 User Manual P N 650201005G Channel mode setting There are two main ways to change the audio channel in use between 8 availables a manually mode called DIP M
7. d is high impedance than 10Kohm same as pin 8 which is internally connected 28 DAC_R Right channel of audio output from DAC directly Useful to feed audio signal to a power amplifier A DC blocking capacitor gt 10 uF should be added unless the load is high impedance than 10Kohm same as pin 10 which is internally connected 29 AMP_R Headphone driver Right channel input volume adjust 30 AMP_L Headphone driver Left channel input volume adjust 31 GND Ground 32 TACT_SW Switch scan automatically scan channel requires a low impulse internal pull up see channel mode setting table for details same as pin 6 which is internally connected NOTE 3 Input is catched on the TACT_SW rising edge we recommend to apply a negative pulse with a duration of at least 10ms All inputs are in CMOS logic with Vsuppiy 2 threshold value to discriminate between high or low level Power Supply The RX AUDIO 2 4 receiver module has two alternative supply ways 5V to Vcc pin 7 or 2 2 to 3 6V to DC_IN pin 22 Whatever source is used the circuit make use of an internally regulated voltage Vsuppy Of 3V The low voltage power supply input DC_IN pin 22 allows to connect a portable device and acquire the power from that When the radio signal is too weak to be played a circuit protection is activate to safeguard energy consumption and unnecessary battery current drainage at the same time audio outputs AMP_R an
8. ilities for any damages caused by the device s misuse AUREL S p A Via Foro dei Tigli 4 47015 Modigliana FC ITALY Tel 39 0546 941124 Fax 39 0546 941660 Rev B 07 10 2009 Pag 1di7 AUKEL RELESS User Manual RX AUDIO 2 4 P N 650201005G Pin description The RX AUDIO 2 4 module can be ideally divided into two sections the first oriented to be plugged with an usual power supply pin 1 to 20 the other optimized to meet the needs of portable devices pin 21 to 36 This is the reason why pins do not follow an usual ordering but it s like having two devices arranged side by side Pin Name Description 1 PWR ON The level is logical high at least 2 7V 1 2 seconds after DC power supply is applied to the module It can be used to turn on the audio power amplifier to prevent pop noise turning on RX module 2 MUTE The voltage level equals Vsuppy see Power Supply section while receiving a radio signal and logical low during poor receiving condition It can be used for receiving indicator extra noise reduction when TX is turn off etc 3 USER_BIT Data stream output correspondent to the data stream applied to USER_BIT signal of TX module Max data rate 5Kbps 7 4 FORMAT _ Pull down to use scrambling digital audio internal pull up 5 OB Forced down enables Out of Band channel recommended for testing purposes only nternal pull u
9. p 6 TACT_SW_ Switch scan automatically scan channel requires a low impulse internal pull up see channel mode setting table for details 7 Vec 5 0 1Vpc 8 DAC_L Left channel of audio output from DAC directly Useful to feed audio signal to a power amplifier A DC blocking capacitor gt 10 uF should be added unless the load is high impedance than 10Kohm 9 GND Ground 10 DAC_R Right channel of audio output from DAC directly Useful to feed audio signal to a power amplifier A DC blocking capacitor gt 10 uF should be added unless the load is high impedance than 10Kohm 11 SW2 In DIP MODE used to manually select the channel internal pull up 12 SWI1 see DIP MODE selection table for details 13 Swo 14 ID3 ID selection low active internal pull up Only receiver s with the same transmitter 15 ID2 ID combination can reproduce transmitted audio 16 ID1 17 IDO 18 CH_MODE Channel mode setting 0 for DIP mode 1 for TACT mode internal pull up see channel mode setting table for details 19 TACT_SCAN TACT mode switch scan channel 0 to switch channel by channel each low impulse is applied on TACT_SW pin 1 to automatically search transmission channel when a low impulse is applied on TACT_SW pin internal pull up see channel mode setting table for details 20 CT_INU _ Automatically scan procedure enable 0 to start channel scan when a low impulse is applied to TACT_SW 1 to au
10. til reaching the desired transmission useful especially when there are more broadcasts on multiple channels starting an automatic search through all channels to find the only one transmitting or automatically start a search of the transmitting channel when poor receiving condition are detected Channel CH_MODE TACT_SCAN CT_INU Function change mode pin 18 pin 19 pin 20 DIP GND x x Manual mode set SW2 SW1 and SWO to choose the channel TACT x GND x Switch channel by channel when each low impulse is applied to TACT_SW pin 6 TACT x x GND Automatically search channel when low impulse is SCAN applied to TACT_SW pin 6 TACT x x x Automatically search channel when poor receiving AUTO SCAN condition NOTE 3 X indicate a floating pin internally pulled up Table 2 Channel mode setting table Le caratteristiche tecniche possono subire variazioni senza preavviso AUREL S p A non si assume la responsabilit di danni causati dall uso improprio del dispositivo Technical features are subject to change without notice AUREL S p A does not assume responsibilities for any damages caused by the device s misuse AUREL S p A Via Foro dei Tigli 4 47015 Modigliana FC ITALY Rev B 07 10 2009 Tel 39 0546 941124 Fax 39 0546 941660 Pag 4di7 esi L E L RX AUDIO 2 4 User Manual P N 650201005G After a channel change in TACT MODE the module is ready to work on the new channel after
11. tomatically search channel when poor receiving condition is verified internal pull up see channel mode setting table for details NOTE 2 PWR ON MUTE and USER_BIT outputs can each deliver a current up to 25mA NOTE 3 Input is catched on the TACT_SW rising edge we recommend to apply a negative pulse with a duration of at least 10ms Le caratteristiche tecniche possono subire variazioni senza preavviso AUREL S p A non si assume la responsabilit di danni causati dall uso improprio del dispositivo Technical features are subject to change without notice AUREL S p A does not assume responsibilities for any damages caused by the device s misuse AUREL S p A Via Foro dei Tigli 4 47015 Modigliana FC ITALY Tel 39 0546 941124 Fax 39 0546 941660 Rev B 07 10 2009 Pag 2di7 AUKEL RX AUDIO 2 4 RELESS User Manual P N 650201005G Pin Name Description 21 GND Ground 22 DC_IN Headphone amplifier supply voltage if less than 2 2Vpc the receiver goes in battery low protection mode 23 GND Ground 24 CH_R Right channel audio headphone driver A DC blocking capacitor gt 100 uF should be added 25 GND Ground 26 CHL Left channel audio headphone driver A DC blocking capacitor gt 100 uF should be added 27 DAC_L Left channel of audio output from DAC directly Useful to feed audio signal to a power amplifier A DC blocking capacitor gt 10 uF should be added unless the loa
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RX AUDIO 2.4