LM49270SQBD

User's Guide SNAA044A – May 2007 – Revised May 2013 AN-1638 LM49270 Demonstration Board 1 General Description The LM49270SQ demoboard is a fully assembled circuit board for use of evaluating the LM49270 Stereo Class D audio subsystem with OCL headphone amplifier, 3D enhancement, and headphone sense. The LM49270 operates from a 2.4V to 5.5V power supply. The filterless stereo class D amplifiers delivers 2.2W/channel into a 4Ω load with less than 10% THD+N with a 5V supply. The headphone amplifiers feature Output Capacitor-less(OCL) architecture that eliminates the output coupling capacitors required by traditional headphone amplifiers. Additionally, the headphone amplifier can be configured as capacitively coupled loads. The LM49270 features a 32 step volume control for the headphone and stereo output. The device mode select and volume are controlled through an I2C compatible interface. 2 Bill of Materials Designator Quantity Description C1–C2 2 100μF ± 10% 10V C Case Tantalum Capacitors AVX TPSC107K010R0075 C4 1 0.22μF ± 10% 16V X7R 0603 Ceramic Capacitor Murata GRM188R71C223KA01D C5 1 2.2μF ± 10% 16V X7R 0805 Ceramic Capacitor Murata GRM21BR71A225KA01L C6–C7 2 1μF ± 10% 16V 1206 Ceramic Capacitors Murata GRM31MR71C105KA01L C8 1 10μF ± 10% 16V B Case Tantalum Capacitor AVX TPSB106K016R0500 C9–C12 4 1μF ± 10% 16V 0805 Ceramic Capacitors Murata GRM21BR71C105KA01L R1 1 4.7kΩ ± 0.1% Panasonic-ECG ERA-3AEB472V R2 1 1kΩ ± 0.1% Panasonic-ECG ERA-3AEB102V R3 1 100kΩ Potentiometer Digikey ST4B104CT All trademarks are the property of their respective owners. SNAA044A – May 2007 – Revised May 2013 Submit Documentation Feedback AN-1638 LM49270 Demonstration Board Copyright © 2007–2013, Texas Instruments Incorporated 1 Connectors 3 www.ti.com Connectors Connecting to the world is accomplished through the headers on the LM49270 demonstration board. The functions of the different headers are detailed in Table 1. Table 1. LM49270 Demonstration Board Connections Designator Label These connectors are used to switch between CC or OCL mode. If JP1 and JP3 are open, then the LM49270 is in CC mode. If JP1 and JP3 are closed, then the LM49270 is in OCL mode. JP1, JP2 JP3 is used to ground the VOC pin of the LM49270. In CC mode, JP3 should be closed, and the VOC amplifier is disabled. JP3 VOC JP4, JP5 LIN, RIN These connectors are used for connecting the input to the LM49270. LIN (JP4) is for left input, and RIN (JP5) is for right input. JP6 VDDLS This connector is for the loudspeaker power supply connection. Apply an external power supply’s positive voltage to the pin labeled VDDLS and the ground source to the pin labeled GND. JP7, JP9 RIGHT SPEAKER, LEFT SPEAKER These connectors are for the right speaker output (JP7) and left speaker output (JP9). JP8 VDDI2C/ADR/GND There are three pins on this connector, VDDI2C, ADR, and GND. It is used to set the LM49270 address. To set the ADR bit to 1, close VDDI2C and ADR. To set the ADR bit to 0, close GND and ADR. This connector should be closed when the user wants to use the VDDLS as the VDD source for the I2CVDD. JP10 VDDI2C This connector can be used to connect to a VDD source if the user wants to power the VDDI2C externally. JP12 HPS This connector is connected to the headphone sense pin of the part and the headphone jack. If JP12 is closed, then the headphone sense function works as designed with a headphone jack. If JP12 is open, then the user does not need a headphone jack to test the function of the HPS. To set to HP mode, set the right pin of JP12 to low. To set to speaker mode, set the right pin to high. JP13, JP14 RHP, LHP JP15 VDD JP11 2 Function These connectors are for the right headphone output (JP13) and the left headphone output (JP14). This connector provides the power supply connection. Apply an external power supply’s positive voltage to the pin labeled VDD and the ground source to the pin labeled GND. JP16 This connector is used to short the LHP to a pull down resistor. In CC mode, JP16 should be closed. In OCL mode, JP16 should be open. JP17 This connector is used to short VDD and VDDLS together. If the user wanted to use only one power supply, then closing JP17 will allow the power supply to be connected to JP15 or JP6 only. AN-1638 LM49270 Demonstration Board Copyright © 2007–2013, Texas Instruments Incorporated SNAA044A – May 2007 – Revised May 2013 Submit Documentation Feedback Quick Start - in CC Mode www.ti.com 4 Quick Start - in CC Mode Connect a shunt across the ADR and GND pins of jumper JP8. (I2C address bit = 0) Connect a shunt across jumper JP3 (VOC = GND, Capacitor Coupled (CC) headphone mode). Connect a shunt across jumper JP16 (for Capacitor Coupled (CC) headphone mode). Connect a shunt across jumper JP12 to use the headphone sense function. Connect an 8Ω speaker across jumper JP7 (Right Speaker output). Connect an 8Ω speaker across jumper JP9 (Left Speaker output). Connect a headphone to jack J1 (headphone jack). Connect the 3.3V power supply to the VDD pin of jumper JP15 and the VDDLS pin of jumper JP6, and the power supply ground terminal to the GND pin of jumper JP15 and jumper JP6. 9. Connect the audio source to JP4 (left input) and JP5 (right input). 10. Connect I2C from PC to I2C Interface jumper. 11. Open LM49270 I2C control software. 12. Turn on power supply and audio source. 13. In the LM49270 I2C control panel, select “C-CUPL” in HEADPHONE OUTPUT COUPLING, and select CHIP POWER-ON mode “ON” to enable the device. 14. Adjust the volume controls to change the speaker and headphone volumes. 15. To enable the speakers, disconnect the headphone from jack J1. 1. 2. 3. 4. 5. 6. 7. 8. 5 Board Connections 5.1 Power Connections Power Connections The LM49270 demoboard offers separate connections for the speaker amplifier and headphone amplifier power supplies. The separate power supplies allow the speakers to operate at a higher voltage for maximum headroom, while the headphones operate at a lower voltage, improving power dissipation. Connect the headphone amplifier power supply to the VDD pin and the power supply ground to the GND pin of jumper JP15. Connect the speaker amplifier power supply to the VDDLS pin and the power supply ground to the GND pin of JP6. As for the I2CVDD, if powered from JP11, it allows the I2C portion of the LM49270 to interface with lower voltage digital controllers. 5.2 Audio Input Connections The left and right channel inputs of the LM49270 demoboard is configured for single-ended sources. Connect a left channel input source to the LIN pin and GND pin of JP4 and connect the a right channel input source to the RIN pin and GND pin of JP5. 5.3 Audio Output Connections Jumpers JP9 and JP7 are the connections for the left and right channel speakers output respectively. The jack, J1 is a 3.5mm stereo headphone jack with a headphone sense pin. 6 Jumper Selection In CC mode, install a shunt across jumper JP3 and jumper JP16. In OCL mode, install a shunt across jumper JP1 and jumper JP2. SNAA044A – May 2007 – Revised May 2013 Submit Documentation Feedback AN-1638 LM49270 Demonstration Board Copyright © 2007–2013, Texas Instruments Incorporated 3 I2C Interface 7 www.ti.com I2C Interface The LM49270 is controlled through an I2C compatible serial interface. The LM49270 evaluation software provides an easy to use graphical user interface (Figure 1). Each button corresponds to bits in an I2C command byte. See the LM49270 data sheet for detailed I2C information. Figure 1. LM49270 Software User's Interface 7.1 CHIP POWER-ON The CHIP POWER-ON button enables or disables the entire device. The device will not output any audio if the CHIP POWER-ON is set to “Off.” 7.2 I2C ADDRESS BIT The I2C ADDRESS BIT button should correspond to the selection on jumper JP8. If the ADR pin is set to GND, then the I2C ADDRESS BIT should be set to ‘0’; if the ADR pin is set to VDDI2C, then the I2C ADDRESS BIT should be set to ‘1’. 7.3 LOUDSPEAKER 3D, HEADPHONE 3D The LOUDSPEAKER 3D and HEADPHONE 3D button enables 3D sound enhancement for loudspeaker and headphone, respectively. By setting it to “ON”, turns on 3D and allows the user to increase or decrease the 3D effect on the demoboard by changing the value of the potentiometer in the external RC network of the LM49270. 7.4 VOLUME CONTROL The LM49270 headphone and speaker channels feature separate volume controls. The loudspeaker volume has a range of -49dB to 30dB and the headphone has a range of -59dB to 18dB, each with 32 steps. 4 AN-1638 LM49270 Demonstration Board Copyright © 2007–2013, Texas Instruments Incorporated SNAA044A – May 2007 – Revised May 2013 Submit Documentation Feedback Schematic and Layout Pictures www.ti.com 8 Schematic and Layout Pictures VDDI2C I2C SCL VDD 2 6 SDA GND VDDLS JP10 I2C PIN HEADER JP11 GNDLS GNDLS VDDLS JP12 22 LLS- VDDLS LLS+ 23 24 25 SCL SDA 26 27 GNDLS JP9 LEFT OUTPUT NC 21 VDDI2C JP8 2 + R VOC 100 PF VOC ADR 1 2 3 20 HPS CRT JP2 3 4 100 PF JP14 VDD HPVDD 19 C10 1 PF U1 LM49270 JP15 VDDI2C C4 5 R3DIN A1 Header 3 VDD C3 1 PF JP16 R2 1k LHP VDD C2 HP JACK + L RHP C1 C11 1 PF 1M HPS J1 1 HPGND 33 VOC JP1 EP JP13 28 HPS R5 R1 0.22 PF 4.7k R3 I2CVDD 2 GNDLS 17 18 C9 1 PF 6 L3DIN NC C6 1 PF C7 1 PF RLS- GNDLS VDDLS VDD JP17 JP7 RIGHT OUTPUT + JP5 NC 15 VDDLS C12 JP4 14 13 RLS+ VDDLS C8 10 PF 12 NC 11 10 RIN 9 8 C5 1 PF GND BYPASS JP3 16 7 LIN 3 100k VOC 1 PF JP6 GNDLS Figure 2. LM49270 Demoboard Schematic SNAA044A – May 2007 – Revised May 2013 Submit Documentation Feedback AN-1638 LM49270 Demonstration Board Copyright © 2007–2013, Texas Instruments Incorporated 5 Demonstration Board PCB Layout 9 www.ti.com Demonstration Board PCB Layout Figure 3. Top Silkscreen Layer Figure 4. Top Layer 6 AN-1638 LM49270 Demonstration Board Copyright © 2007–2013, Texas Instruments Incorporated SNAA044A – May 2007 – Revised May 2013 Submit Documentation Feedback Demonstration Board PCB Layout www.ti.com Figure 5. Mid Layer 1 Figure 6. Mid Layer 2 SNAA044A – May 2007 – Revised May 2013 Submit Documentation Feedback AN-1638 LM49270 Demonstration Board Copyright © 2007–2013, Texas Instruments Incorporated 7 Demonstration Board PCB Layout www.ti.com Figure 7. Bottom Layer Figure 8. Bottom Silkscreen 8 AN-1638 LM49270 Demonstration Board Copyright © 2007–2013, Texas Instruments Incorporated SNAA044A – May 2007 – Revised May 2013 Submit Documentation Feedback Revision History www.ti.com 10 Revision History Rev Date Description 1.0 05/24/07 Initial release. SNAA044A – May 2007 – Revised May 2013 Submit Documentation Feedback AN-1638 LM49270 Demonstration Board Copyright © 2007–2013, Texas Instruments Incorporated 9 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. 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