AND9111/D BELASIGNA[ R262 Analog Demonstrator User's Guide http://onsemi.com APPLICATION NOTE • The 30−ball WLCSP version of BelaSigna R262 The BelaSigna R262 Analog Demonstrator The BelaSigna R262 Analog Demonstrator is a self−contained, battery−powered unit that can be used to demonstrate and evaluate the performance of BelaSigna R262. (BR262W30A103E1G) • Two MEMS microphones spaced 10 mm apart (Knowles part number SPU0410HR5H−PB) • An onboard 2.048 MHz oscillator • A stereo (line−level) output jack • Onboard, dual AAA batteries for extended battery life Key Features The Analog Demonstrator is shown in Figure 1 and features: • Compact form factor of only 51 mm x 24.5 mm x 20 mm and portable use • Onboard SPI EEPROM Power Switch (SW1) BelaSigna R262 Stereo Output Jack (OUT) Algorithm Select (ALGO) Dual MEMS Microphones Figure 1. BelaSigna R262 Analog Demonstrator Connecting the Analog Demonstrator to disconnect the AO1 signal from the ring terminal of the 3.5 mm stereo output jack. Note: The analog output impedance is 3 kW and is intended to drive a high−impedance (line−level) input, not speakers nor headphones directly. Refer to the BelaSigna R262 datasheet for information on output stage characteristics. The analog output signals AO0 and AO1 are available on the stereo output jack labeled OUT. AO0 is connected to the jack tip, AO1 is connected to the ring, and the sleeve is connected to analog ground as shown in Figure 2. If you are interested in using the analog demonstrator with a mono recording device, simply remove the RING jumper © Semiconductor Components Industries, LLC, 2012 November, 2012 − Rev. 0 1 Publication Order Number: AND9111/D AND9111/D Figure 2. Analog Demonstrator Output Jack Pinout Jumper Configuration and a component placement diagram for the analog demonstrator are provided in Appendix A. There are three jumpers on the analog demonstrator: EE, GND, and RING. By default, all three jumpers should be shorted. Their behavior is summarized in Table 1. Complete schematics Table 1. ANALOG DEMONSTRATOR JUMPER CONFIGURATION Default Position Jumper Shorted Open EE Boot the custom application contained in EEPROM Boots the DSP to “I2C host boot” mode, expecting an application to be downloaded via I2C Shorted GND Connects the ground pin of the CAA (I2C) connector to ground Lifts the ground pin of the CAA (I2C) connector, avoiding a potential ground loop when the output jack of the demonstrator is connected to the same computer as the CAA. If powering the demonstrator from the CAA, ensure the output jack is connected prior to removing the GND jumper. Shorted RING Connects the second analog output of BelaSigna R262 (AO1) to the ring terminal of the 3.5 mm stereo (OUT) jack Disconnects the ring terminal of the 3.5 mm stereo (OUT) jack, which can be useful when connecting to mono recording equipment, or devices that bias the ring terminal Shorted Visual Indicators reduction performance in this mode is 10 to 20 dB SNR−I, depending on the type of noise. There are two LEDs on the analog demonstrator. The green LED (D1) indicates that power is on. The blue LED (D2) indicates when the analog demonstrator is in Active Mode and is outputting processed audio. When the analog demonstrator is in Bypass Mode D2 is off. Close−Talk Mode Close−talk mode aggressively filters noise and manages gain to pick up speech within 5 to 10 cm from the microphone array, effectively attenuating both speech and noise that is farther away. This mode is suitable for mobile handsets and radios where the speech source is very close to the microphones and the noise level can be quite high; up to 90 dB SPL. Noise reduction performance in this mode ranges from 20 to 30 dB SNR improvement (SNR−I), depending on the type of noise. Refer to the AND9109/D − BelaSigna R262 Getting Started Guide for details on the different algorithm modes and performance metrics. Default Configuration The analog demonstrator boots to a custom application stored in an onboard SPI EEPROM. This custom application is pre−configured to simultaneously output two different noise reduction algorithm modes: near−talk on AO0 and close−talk on AO1. The processed outputs from these two modes are available as single−ended analog outputs on the stereo output jack (OUT). Near−Talk Mode Near−talk mode features excellent noise reduction in applications where the speech source is located slightly further away from the microphones; typically 50 to 100 cm. This mode is suitable for handsfree devices and performs well in noise levels up to 70 dB SPL. Expected noise Operating the Analog Demonstrator There is a pushbutton on the demonstrator labeled ALGO that provides the ability to switch between the two processed algorithm outputs, and stereo bypass. Pressing and releasing the button will toggle between Bypass Mode, and Active http://onsemi.com 2 AND9111/D RESET button. Either method will swap the channel routing in Active mode, giving you access to the close−talk processed output on the tip terminal of the stereo output jack. To restore the analog demonstrator to its default channel routing, ensure you are not holding down the ALGO button and cycle the power to the device or press the RESET button. (algorithms on) Mode. When the analog demonstrator is in Active Mode and is outputting processed audio, the blue LED (D2) will be on. When the analog demonstrator is in Bypass Mode, D2 is off. It is also possible to swap the stereo assignment of the two processed channels in Active mode, using the ALGO button. This is useful if you are interested in using the analog demonstrator with a mono recording device, but would prefer to record the processed signal on AO1 (close−talk), which is normally routed to the ring terminal of the stereo output jack. To swap the tip and ring of the stereo output jack, power on or reset the device while holding down the ALGO button. This can be accomplished by turning the power off and on again using SW1 while holding the ALGO button. Alternatively, this can also be achieved by holding the ALGO button down while momentarily pressing the Demonstrator Positioning The speech source can come from any direction (normally in front of the microphones), as long as it is within the “working sphere” of the current algorithm mode. For close−talk mode, the MRP should be located between 5 and 10 cm from the microphones. For near−talk, the mouth reference point (MRP) should be located between 50 and 100 cm from the microphones. http://onsemi.com 3 AND9111/D APPENDIX A R3 10K SW1 2 SCL SDA VCC VCC R6 560K C13 56nF L1 22uH 2 3 5 U3 LBI LBO SHDN OUT 8 FB 1 NCP1410 C18 100nF VBAT 4 1 Y1 VCC EN R8 390K OUTPUT GND 3 2 VBAT 2.048MHz C15 150pF CLK C16 33uF EXT_CLK C17 100nF R10 820 D1 Power Indicator Figure 3. Schematic Sheet 1 of 2 − Power Supply and Clocking VBAT R4 10K 1 3 C12 33uF R5 DNI R7 330K R9 220K 4 CAA D3 + GND1 C14 150nF http://onsemi.com 1 2 3 4 GND 1 2 J1 3V − 7 LX REF 4 ref GND 6 AND9111/D EE 1 2 VBAT 6 SCK 1 CS 5 SI SO 2 VBAT R2 100 D2 GND2 VREG ALGO VREG C6 1uF VSSA C1 1uF C5 C7 C9 B8 A9 A7 G3 G1 E5 VBAT DGND U1 GPIO5 GPIO4 GPIO3 GPIO2 GPIO1 GPIO0 VREG AI0 VDDA C2 1uF VDDD VDDD C3 1uF DGND BelaSigna R262 VSSA VDDA VBAT AI1_LOUT AI2 VDDA C4 4.7uF VSSA VBAT C5 1uF DGND C1 I2C_SCL C3 I2C_SDA F2 D4 E7 D6 A3 B2 DEBUG_TX A1 DEBUG_RX EXT_CLK RCVR0P_AO0 RCVR0M_AO1 NRESET EN_TEST DGND SCL SDA RING 1 2 EXT_CLK C8 2.2uF C10 2.2uF RESET 2 3 1 OUT Figure 4. Schematic Sheet 2 of 2 − BelaSigna R262 B4 VDDO VREG R1 10K TP1 C7 10nF VSSA E1 C11 VBATRCVR G9 100nF http://onsemi.com U2 3 WP 7 HOLD VMIC mic0 TP2 C9 VMIC AI3_VMIC DGND 5 CAT25640 VSSD VSSA mic1 10nF E3 VSSA DGND CAP1 F8 B6 VDDD CAP0 G7 MIC0 1 4 2 3 MIC1 1 4 2 3 VSSA VSSA VSSD A5 G5 VDDA VSSRCVR E9 F6 VBAT VSSA F4 8 VCC VSS 4 AND9111/D Figure 5. BelaSigna R262 Component Placement http://onsemi.com 6 AND9111/D Company or Product Inquiries Technical Contact Information For more information about ON Semiconductor products or services visit our website at http://onsemi.com. For technical support, email: [email protected] BELASIGNA is a registered trademark of Semiconductor Components Industries, LLC (SCILLC). ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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