LME49720MABD

User's Guide SNAA052A – February 2008 – Revised May 2013 AN-1768 LME49600 Headphone Amplifier Evaluation Board 1 Quick Start Guide 1. Apply a ±2.5V to ±17V power supply’s voltage to the respective “V+”, “GND” and “V–” pins on JU19. 2. Apply a stereo audio signal to the RCA jacks J1 (Right) and J2 (Left) or jumpers JU1 (Right) and JU17 (Left), observing the signal input pin and the ground (GND) pin. Though not typically installed, a stereo signal can also be applied to headphone jack HPJ1. 3. Connect a load to JU14 (Left) and another load to JU15 (Right), observing the signal output pin and the ground (GND) pin. The stereo signal output is also available on the 1/8” stereo headphone jack located in the board's “OUTPUT” section. 4. Use VR1 to control the output signal amplitude. 5. Apply power. Make measurements. Plug in a pair of headphones. Enjoy. 2 Introduction To help the user investigate and evaluate the LME49600's performance and capabilities, a fully populated demonstration board was created. Please click here for availability. This board is shown in Figure 1. Connected to an external power supply (±2.5V to ±17V) and a signal source. The LME49600 demonstration board easily demonstrates the amplifier's features. All trademarks are the property of their respective owners. SNAA052A – February 2008 – Revised May 2013 Submit Documentation Feedback AN-1768 LME49600 Headphone Amplifier Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated 1 General Description www.ti.com Figure 1. LME49600/LME49720 Stereo Headphone Amplifier Demonstration Board 3 General Description The LME49600 is a high performance, low distortion high fidelity 250mA audio buffer. Whereas there are many uses for the LME49600, this application report describes a headphone amplifier circuit and associated demonstration board. Designed for use inside an operational amplifier’s feedback loop, it increases output current, improves capacitive load drive, and eliminates thermal feedback. The LME49600 offers a pin-selectable bandwidth: a low current, 110MHz bandwidth mode that consumes 8mA and a wide 180MHz bandwidth mode that consumes 15mA. In both modes the LME49600 has a nominal 2000V/μs slew rate. Bandwidth is easily adjusted by either leaving the BW pin unconnected, connecting a resistor between the BW pin and the VEE pin or connecting the BW pin directly to the VEE pin. The LME49600 is fully protected through internal current limit and thermal shutdown. 4 Operating Conditions –40°C ≤ TA ≤ 85°C Temperature Range Amplifier Power Supply Voltage 2 2.5V ≤ VS ±17V AN-1768 LME49600 Headphone Amplifier Evaluation Board SNAA052A – February 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Board Features www.ti.com 5 Board Features The LME49600/LME49720 Stereo Headphone Amplifier demonstration board has all of the necessary connections, using RCA jacks, 1/8” stereo headphone jack and 0.100” headers, to apply the power supply voltage and the audio input signals. The amplified audio signal is available on both a stereo headphone jack and auxiliary output connections. Also present on the demonstration board is a potentiometer to control the stereo output signal magnitude. 6 Schematic Figure 2 shows the LME49600/LME49720 Stereo Headphone Amplifier Demonstration Board schematic. Table 1 is a list of the connections and their functions. V+ V+ C19 0.1 PF C24 C1 + 6 1 3 VR1-A 2 2 8 + U1-A U3 BW 4 LME49600 3 C23 + JU1 1 C2 4 4.7 PF + See note R3 1k 1.0 PF V- 4.7 PF C20 C5 HPJ1 R9 1M 3 5 4 2 1 R10 V- 1.0 PF 6 5 U1-B See note 7 + 1M C6 2 0.1 PF JU15 R5 1k V+ JU6 C21 JU14 HPJ2 3 5 4 2 1 0.1 PF C10 1.0 PF + J2 1 JU17 V+ 5 4 3 VR1-B 1 U2-A - U4 BW See note 22 PF LME49600 1 C9 4.7 PF C22 R4 1k 1.0 PF V- 4 3 C4 4 R2 1k 1 1.0 PF V+ 4.7 PF C12 + S1-A + 2 3 8 + 5 2 C3 + J1 1 5 2 1 - R1 1k 2 1.0 PF V- 3 1 5 4 3 1 See note U2-B + C8 7 6 R6 1k VBAT2 4 C14 + 1M S1-B JU4 R12 - JU19 2 5 1.0 PF 6 V+ BAT1 4 0.1 PF C7 R11 1M 1 2 22 PF V- 1.0 PF Figure 2. LME49600 Demonstration Board Schematic Note: The LM4562, LME49720, or LME49860 can be used. SNAA052A – February 2008 – Revised May 2013 Submit Documentation Feedback AN-1768 LME49600 Headphone Amplifier Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated 3 Connections 7 www.ti.com Connections Connecting to the world is accomplished through a combination of RCA jacks, 1/8” stereo headphone jacks and 0.100” headers on the LME49600 demonstration board. The functions of the different headers, 1/8” headphone jacks and RCA jacks are detailed in Table 1. Table 1. LME49600 Demonstration Board Connections Designator JU17 J2 HPJ1 J1 This is an RCA connector that parallels the pins on JU17. Stereo, 1/8” headphone jack. Used for stereo signal input. Left channel input is on the tip connector and the right channel input is on the ring connector. Ground is on the sleeve connector. This is an RCA connector that parallels the pins on JU1. JU1 This is the connection to the amplifier’s right channel input. Apply an external signal source’s positive voltage to the JU1 pin labeled “RT IN” and the signal source’s ground signal to the pin labeled “GND.” JU19 Power supply connection. Connect an external split power supply’s voltage source ±2.5V to ±17V to the JU19 pin labeled (“V+” and “V-”)” and the supply’s ground source to the pin labeled “GND.” JU14 This is the connection to the amplifier’s single-ended, ground-referenced left channel output. Connect the JU14 pin labeled “LT OUT” and the pin labeled “GND” to the positive and ground inputs, respectively, of an external signal measurement device. JU14’s pin labeled “LT OUT” corresponds to the headphone jack’s “tip” connection. J5’s pin labeled “GND“ corresponds to the headphone jack’s “sleeve” (or ground) connection. HPJ2 Stereo, 1/8” headphone jack. Used for stereo signal output. Left channel output is on the tip connector and the right channel output is on the ring connector. Ground is on the sleeve connector. JU15 This is the connection to the amplifier’s ground-referenced right channel output. Connect the JU15 pin labeled “RT OUT” and the pin labeled “GND” to the positive and ground inputs, respectively, of an external signal measurement device. JU15’s pin labeled “RT OUT” corresponds to the headphone jack’s “ring” connection. J4’s pin labeled “GND“ corresponds to the headphone jack’s “sleeve” (or ground) connection. JU4, JU6 8 Function or Use This is the connection to the amplifier’s left channel input. Apply an external signal source’s positive voltage to the JU17 pin labeled “LT IN” and the signal source’s ground signal to the pin labeled “GND.” These connections allow monitoring the left and right channel DC servo outputs, respectively. PCB Layout Guidelines This section provides general practical guidelines for PCB layouts that use various power and ground traces. Designers should note that these are only "rule-of-thumb" recommendations and the actual results are predicated on the final layout. 8.1 Power and Ground Circuits Star trace routing techniques can have a major positive impact on low-level signal performance. Star trace routing refers to using individual traces that radiate from a signal point to feed power and ground to each circuit or even device. 4 AN-1768 LME49600 Headphone Amplifier Evaluation Board SNAA052A – February 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Bill of Materials www.ti.com 9 Bill of Materials RefDes Part Description Tolerance Rating Package Type Manufacturer and Part Number BAT1– BAT2 9V Battery Terminal (male & female) [Not Installed] C1 – C8 MULITYLAYER CERAMIC CAPACITOR 1.0μF ±20% 25V 805 TDK C2012X5R1E105M C9 C10, C23 – C24 TANTALUM ELECTROLYTIC CAPACITOR 4.7μF ±10% 35V B CASE AVX TPSB475K035R0700 22μF ±20% 25V C CASE AVX TPSD226M025#011 0.1μF ±10% 25V 603 1/4W resistor 1kΩ ±1% 1/4W 1/4W resistor 1MΩ ±1% 1/4W S1 SWITCH SLIDE DPDT [Not Installed] DPDT U1, U2 LME49720 (Can also use LM4562, LME49860) Texas Instruments LME49720 (LM4562 or LME49860) U3, U4 LME49600 Texas Instruments LME49600 VR1 Dual gauged potentiometer C12, C14 C19 – C22 CERAMIC CAPACITOR HPJ1– HPJ2 1/8” Stereo Headphone Jack J1 – J2 RCA jack JU1, JU4, JU6, JU14, JU15, JU17 100mil pin pitch, two pin JU19 100mil pin pitch, three pin R1 – R6 R9 – R12 10 Value KEYSTONE 593 (Female) & 594 (Male) TDK C1608X7R1E104K 1/4W, Axial YAGEO MFR-25FBF-1K00 1/4W, Axial YAGEO MFR-25FBF-1M00 PANASONIC EVJ-Y00F30A14 10kΩ Demonstration Board PCB Layout Figure 3 through Figure 6 show the different layers used to create the LME49600 demonstration board. Figure 3 is the silkscreen that shows parts location, Figure 4 is the top layer, Figure 5 is the bottom layer, and Figure 6 is the bottom silkscreen layer. SNAA052A – February 2008 – Revised May 2013 Submit Documentation Feedback AN-1768 LME49600 Headphone Amplifier Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated 5 Demonstration Board PCB Layout www.ti.com Figure 3. Top Silkscreen Figure 4. Top Layer 6 AN-1768 LME49600 Headphone Amplifier Evaluation Board SNAA052A – February 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Demonstration Board PCB Layout www.ti.com Figure 5. Bottom Layer Figure 6. Bottom Silk Layer SNAA052A – February 2008 – Revised May 2013 Submit Documentation Feedback AN-1768 LME49600 Headphone Amplifier Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated 7 Typical Performance 11 www.ti.com Typical Performance 0.01 0.01 THD+N (%) 0.001 1 0.1 0.01 0.001 OUTPUT POWER (W) OUTPUT POWER (W) Figure 7. THD+N vs Output Power LME49720/LME49600 headphone amplifier into (from top to bottom at 0.1mW): 16Ω, 32Ω, 64Ω, 300Ω (VS = ±3V, f = 100Hz, 22Hz ≤ BW ≤ 22kHz) 0.0001 0.000001 1 0.1 0.01 0.001 0.0001 0.00001 0.00001 0.0001 0.00001 0.0001 0.000001 THD+N (%) 0.001 Figure 8. THD+N vs Output Power LME49720/LME49600 headphone amplifier into (from top to bottom at 10mW): 16Ω, 32Ω, 64Ω, 300Ω (VS = ±9V, f = 100Hz, 22Hz ≤ BW ≤ 22kHz) 0.01 0.01 OUTPUT POWER (W) Figure 9. THD+N vs Output Power LME49720/LME49600 headphone amplifier into (from top to bottom at 10mW): 16Ω, 32Ω, 64Ω, 300Ω (VS = ±15V, f = 100Hz, 22Hz ≤ BW ≤ 22kHz) 8 AN-1768 LME49600 Headphone Amplifier Evaluation Board 1 0.1 0.01 0.001 0.0001 0.0001 0.00001 10 1 0.1 0.01 0.001 0.0001 0.000001 0.00001 0.00001 0.0001 0.001 0.000001 THD+N (%) THD+N (%) 0.001 OUTPUT POWER (W) Figure 10. THD+N vs Output Power LME49720/LME49600 headphone amplifier into (from top to bottom at 0.1mW): 16Ω, 32Ω, 64Ω, 300Ω (VS = ±3V, f = 1kHz, 400Hz ≤ BW ≤ 22kHz) SNAA052A – February 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Typical Performance www.ti.com 0.01 0.001 0.001 OUTPUT POWER (W) Figure 11. THD+N vs Output Power LME49720/LME49600 headphone amplifier into (from top to bottom at 10mW): 16Ω, 32Ω, 64Ω, 300Ω (VS = ±9V, f = 1kHz, 400Hz ≤ BW ≤ 22kHz) 10 1 0.1 0.01 0.001 0.0001 1 0.01 0.001 0.00001 0.000001 0.00001 0.1 0.00001 0.0001 0.0001 0.000001 0.0001 0.00001 THD+N (%) THD+N (%) 0.01 OUTPUT POWER (W) Figure 12. THD+N vs Output Power LME49720/LME49600 headphone amplifier into (from top to bottom at 10mW): 16Ω, 32Ω, 64Ω, 300Ω (VS = ±15V, f = 1kHz, 400Hz ≤ BW ≤ 22kHz) 0.01 0.01 THD+N (%) THD+N (%) 0.001 0.001 OUTPUT POWER (W) Figure 13. THD+N vs Output Power LME49720/LME49600 headphone amplifier into (from top to bottom at 0.1mW): 16Ω, 32Ω, 64Ω, 300Ω (VS = ±3V, f = 10kHz, 400Hz ≤ BW ≤ 80kHz) 1 0.1 0.01 0.001 0.00001 0.000001 1 0.1 0.01 0.001 0.00001 0.0001 0.00001 0.000001 0.0001 0.0001 0.0001 OUTPUT POWER (W) Figure 14. THD+N vs Output Power LME49720/LME49600 headphone amplifier into (from top to bottom at 20mW): 16Ω, 32Ω, 64Ω, 300Ω (VS = ±9V, f = 10kHz, 400Hz ≤ BW ≤ 80kHz) 0.01 0.001 THD+N (%) THD+N (%) 0.001 10 1 0.1 0.01 0.001 0.0001 0.000001 0.00001 0.00001 0.0001 0.0001 10 100 1k 10k 100k FREQUENCY (Hz) OUTPUT POWER (W) Figure 15. THD+N vs Output Power LME49720/LME49600 headphone amplifier into (from top to bottom at 20mW): 16Ω, 32Ω, 64Ω, 300Ω (VS = ±15V, f = 10kHz, 400Hz ≤ BW ≤ 80kHz) SNAA052A – February 2008 – Revised May 2013 Submit Documentation Feedback Figure 16. THD+N vs Frequency LME49720/LME49600 headphone amplifier into (from top to bottom at 5kHz): 16Ω at 3mW, 32Ω at 3mW, 300Ω at 0.3mW, and 64Ω at 1.5mW (VS = ±3V, < 10Hz ≤ BW ≤ 80kHz) AN-1768 LME49600 Headphone Amplifier Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated 9 Revision History 0.01 0.001 0.001 THD+N (%) THD+N (%) www.ti.com 0.01 0.0001 0.0001 0.00001 10 100 1k 10k 0.00001 10 100k FREQUENCY (Hz) 100 1k 10k 100k FREQUENCY (Hz) Figure 17. THD+N vs Frequency Figure 18. THD+N vs Frequency LME49720/LME49600 headphone amplifier LME49720/LME49600 headphone amplifier into (from top to bottom at 5kHz): 16Ω at 100mW, 32Ω into (from top to bottom at 5kHz): 16Ω at 100mW, 32Ω at 100mW, 64Ω at 35mW, and 300Ω at 8mW at 100mW, 64Ω at 150mW, and 300Ω at 30mW (VS = ±9V, < 10Hz ≤ BW ≤ 80kHz) (VS = ±15V, < 10Hz ≤ BW ≤ 80kHz) 12 10 Revision History Rev Date 1.0 02/29/08 Description Initial release. AN-1768 LME49600 Headphone Amplifier Evaluation Board SNAA052A – February 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated 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. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products. 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