Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Audio amplifier Headphones (2-channel, stereo) Class AB VSSOP 8

LM4810

www.ti.com

SNAS125D –FEBRUARY 2001–REVISED APRIL 2013

LM4810

Dual 105mW Headphone Amplifier with Active-High Shutdown Mode

Check for Samples: LM4810

FEATURES

DESCRIPTION

The LM4810 is a dual audio power amplifier capable

• Active-High Shutdown Mode

of delivering 105mW per channel of continuous

• WSON, VSSOP, and SOIC Surface Mount

average power into a 16Ω load with 0.1% (THD+N)

Packaging

from a 5V power supply.

• "Click and Pop" Suppression Circuitry

Boomer audio power amplifiers were designed

• Low Shutdown Current

specifically to provide high quality output power with a

minimal amount of external components. Since the

• No Bootstrap Capacitors Required

LM4810 does not require bootstrap capacitors or

• Unity-Gain Stable

snubber networks, it is optimally suited for low-power

portable systems.

APPLICATIONS

The unity-gain stable LM4810 can be configured by

• Cellular Phones

external gain-setting resistors.

• Personal Computers

The LM4810 features an externally controlled, active-

• Microphone Preamplifier

high, micropower consumption shutdown mode, as

• PDA's

well as an internal thermal shutdown protection

mechanism.

KEY SPECIFICATIONS

• THD+N at 1kHz, 105mW Continuous Average

Power into 16Ω 0.1 % (typ)

• THD+N at 1kHz, 70mW Continuous Average

Power into 32Ω 0.1 % (typ)

• Shutdown Current 0.4 µA (typ)

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (25 pages)

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LM4810 www.ti.com SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 LM4810 Dual 105mW Headphone Amplifier with Active-High Shutdown Mode Check for Samples: LM4810 FEATURES DESCRIPTION • • The LM4810 is a dual audio power amplifier capable of delivering 105mW per channel of continuous average power into a 16Ω load with 0.1% (THD+N) from a 5V power supply.
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LM4810 SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com Typical Application *Refer to Application Information for information concerning proper selection of the input and output coupling capacitors. Figure 1.
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LM4810 www.ti.com SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 Connection Diagrams Top View Top View Figure 2. VSSOP Package See Package Number DGK0008A Figure 3. SOIC Package See Package Number D0008A Top View Figure 4.
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LM4810 SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) Supply Voltage 6.0V −65°C to +150°C Storage Temperature ESD Susceptibility (3) 3.
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LM4810 www.ti.com SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 Electrical Characteristics (1)(2) (continued) The following specifications apply for VDD = 5V unless otherwise specified, limits apply to TA = 25°C. Parameter Test Conditions Typ Limit (4) 70 Units (Limits) PSRR Power Supply Rejection Ratio VSDIH Shutdown Voltage Input High 0.8 x VDD V (min) VSDIL Shutdown Voltage Input Low 0.2 x VDD V (max) Electrical Characteristics CB = 1.
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LM4810 SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com External Components Description Components 6 Functional Description (See Figure 1) 1. Ri The inverting input resistance, along with Rf, set the closed-loop gain. Ri, along with Ci, form a high pass filter with fc = 1/(2πRiCi). 2. Ci The input coupling capacitor blocks DC voltage at the amplifier's input terminals. Ci, along with Ri, create a highpass filter with fc = 1/(2πRiCi).
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LM4810 www.ti.com SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 Typical Performance Characteristics THD+N vs Frequency THD+N vs Frequency Figure 5. Figure 6. THD+N vs Frequency THD+N vs Frequency Figure 7. Figure 8. THD+N vs Frequency THD+N vs Frequency Figure 9. Figure 10.
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LM4810 SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 8 THD+N vs Frequency THD+N vs Frequency Figure 11. Figure 12. THD+N vs Frequency THD+N vs Frequency Figure 13. Figure 14. THD+N vs Output Power THD+N vs Output Power Figure 15. Figure 16.
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LM4810 www.ti.com SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 Typical Performance Characteristics (continued) THD+N vs Output Power THD+N vs Output Power Figure 17. Figure 18. THD+N vs Output Power THD+N vs Output Power Figure 19. Figure 20. THD+N vs Output Power THD+N vs Output Power Figure 21. Figure 22.
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LM4810 SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 10 THD+N vs Output Power Output Power vs Load Resistance Figure 23. Figure 24. Output Power vs Load Resistance Output Power vs Load Resistance Figure 25. Figure 26. Output Power vs Supply Voltage Output Power vs Power Supply Figure 27. Figure 28.
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LM4810 www.ti.com SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Output Power vs Power Supply Dropout Voltage vs Supply Voltage Figure 29. Figure 30. Power Dissipation vs Output Power Power Dissipation vs Output Power Figure 31. Figure 32. Power Dissipation vs Output Power Channel Separation Figure 33. Figure 34.
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LM4810 SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 12 Noise Floor Power Supply Rejection Ratio Figure 35. Figure 36. Open Loop Frequency Response Open Loop Frequency Response Figure 37. Figure 38. Open Loop Frequency Response Supply Current vs Supply Voltage Figure 39. Figure 40.
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LM4810 www.ti.com SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 APPLICATION INFORMATION MICRO-POWER SHUTDOWN The voltage applied to the SHUTDOWN pin controls the LM4810's shutdown function. Activate micro-power shutdown by applying a logic high voltage to the SHUTDOWN pin. The logic threshold is typically VDD/2. When active, the LM4810's micro-power shutdown feature turns off the amplifier's bias circuitry, reducing the supply current. The low 0.
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LM4810 SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com POWER SUPPLY BYPASSING As with any power amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. Applications that employ a 5V regulator typically use a 10µF in parallel with a 0.1µF filter capacitors to stabilize the regulator's output, reduce noise on the supply line, and improve the supply's transient response. However, their presence does not eliminate the need for a local 1.
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LM4810 www.ti.com SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 OPTIMIZING CLICK AND POP REDUCTION PERFORMANCE The LM4810 contains circuitry that minimizes turn-on and shutdown transients or “clicks and pop”. For this discussion, turn-on refers to either applying the power supply voltage or when the shutdown mode is deactivated. During turn-on, the LM4810's internal amplifiers are configured as unity gain buffers.
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LM4810 SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com (5) (6) VDD ≥ (2VOPEAK + (VODTOP + VODBOT)) Figure 29 indicates a minimum supply voltage of 4.8V. This is easily met by the commonly used 5V supply voltage. The additional voltage creates the benefit of headroom, allowing the LM4810 to produce peak output power in excess of 70mW without clipping or other audible distortion.
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LM4810 www.ti.com SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 Demonstration Board Schematic Figure 41. LM4810 Demonstration Board Schematic Demonstration Board Layout Figure 42.
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LM4810 SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com Figure 43. Recommended PC Board Layout Component-Side Layout Figure 44. Recommended PC Board Layout Bottom-Side Layout Figure 45.
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LM4810 www.ti.com SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 Figure 46. Recommended NGL0008B PC Board Layout Component-Side Layout Figure 47.
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LM4810 SNAS125D – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision C (April 2013) to Revision D • 20 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM4810MM/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LM4810MMX/NOPB VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM4810MM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LM4810MMX/NOPB VSSOP DGK 8 3500 367.0 367.0 35.
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