Datasheet

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

LM4809, LM4809LQBD

www.ti.com

SNAS126F –FEBRUARY 2001–REVISED APRIL 2013

LM4809 Dual 105mW Headphone Amplifier with Active-

Low Shutdown Mode

Check for Samples: LM4809, LM4809LQBD

FEATURES

DESCRIPTION

The LM4809 is a dual audio power amplifier capable

• Active-Low Shutdown Mode

of delivering 105mW per channel of continuous

• "Click and Pop" Reduction Circuitry

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

• Low Shutdown Current

from a 5V power supply.

• WSON, MSOP, and SOIC Surface Mount

Boomer audio power amplifiers were designed

Packaging

specifically to provide high quality output power with a

minimal amount of external components. Since the

• No Bootstrap Capacitors Required

LM4809 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 LM4809 can be configured by

• Headphone Amplifier

external gain-setting resistors.

• Personal Computers

The LM4809 features an externally controlled, active-

• Microphone Preamplifier

low, micropower consumption shutdown mode, as

• PDA's

well as an internal thermal shutdown protection

mechanism.

KEY SPECIFICATIONS

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

Power into 16Ω 0.1% (typ)

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

Power into 32Ω 0.1% (typ)

• Shutdown Current 0.4µA (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 (29 pages)

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LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 LM4809 Dual 105mW Headphone Amplifier with ActiveLow Shutdown Mode Check for Samples: LM4809, LM4809LQBD FEATURES DESCRIPTION • • • • The LM4809 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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LM4809, LM4809LQBD SNAS126F – 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. Typical Audio Amplifier Application Circuit Connection Diagrams Top View Top View Figure 2. VSSOP Package See Package Number DGK0008A 2 Submit Documentation Feedback Figure 3.
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LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 Top View Top View VDD 8 7 VOUT1 1 6 VIN2 VIN1 2 5 SHUTDOWN 3 4 Bypass Figure 4. WSON Package See Package Number NGL0008B VOUT2 GND Figure 5.
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LM4809, LM4809LQBD SNAS126F – 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) 3.5kV (4) ESD Machine model 250V Junction Temperature (TJ) 150°C Vapor Phase (60 sec.
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LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 Electrical Characteristics VDD = 5V (1)(2) (continued) The following specifications apply for VDD = 5V unless otherwise specified, limits apply to TA = 25°C. Parameter Test Conditions LM4809 Typ (3) Limit (4) Units (Limits) VSDIH Shutdown Voltage Input High 0.8 x VDD V (min) VSDIL Shutdown Voltage Input Low 0.2 x VDD V (max) Electrical Characteristics VDD = 3.
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LM4809, LM4809LQBD SNAS126F – 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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LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 Typical Performance Characteristics THD+N vs Frequency THD+N vs Frequency Figure 6. Figure 7. THD+N vs Frequency THD+N vs Frequency Figure 8. Figure 9. THD+N vs Frequency THD+N vs Frequency Figure 10. Figure 11.
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LM4809, LM4809LQBD SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 8 THD+N vs Frequency THD+N vs Frequency Figure 12. Figure 13. THD+N vs Frequency THD+N vs Frequency Figure 14. Figure 15. THD+N vs Output Power THD+N vs Output Power Figure 16. Figure 17.
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LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 Typical Performance Characteristics (continued) THD+N vs Output Power THD+N vs Output Power Figure 18. Figure 19. THD+N vs Output Power THD+N vs Output Power Figure 20. Figure 21. THD+N vs Output Power THD+N vs Output Power Figure 22. Figure 23.
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LM4809, LM4809LQBD SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 10 THD+N vs Output Power Output Power vs Load Resistance Figure 24. Figure 25. Output Power vs Load Resistance Output Power vs Load Resistance Figure 26. Figure 27. Output Power vs Supply Voltage Output Power vs Power Supply Figure 28. Figure 29.
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LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Output Power vs Power Supply Dropout Voltage vs Supply Voltage Figure 30. Figure 31. Power Dissipation vs Output Power Power Dissipation vs Output Power Figure 32. Figure 33. Power Dissipation vs Output Power Channel Separation Figure 34. Figure 35.
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LM4809, LM4809LQBD SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 12 Noise Floor Power Supply Rejection Ratio Figure 36. Figure 37. Open Loop Frequency Response Open Loop Frequency Response Figure 38. Figure 39. Open Loop Frequency Response Supply Current vs Supply Voltage Figure 40. Figure 41.
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LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 APPLICATION INFORMATION MICRO-POWER SHUTDOWN The voltage applied to the SHUTDOWN pin controls the LM4809's shutdown function. Activate micro-power shutdown by applying a logic low voltage to the SHUTDOWN pin. The logic threshold is typically VDD/2. When active, the LM4809's micro-power shutdown feature turns off the amplifier's bias circuitry, reducing the supply current. The low 0.
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LM4809, LM4809LQBD SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com For package MUA08A, θJA = 210°C/W. TJMAX = 150°C for the LM4809. Depending on the ambient temperature, TA, of the system surroundings, Equation 2 can be used to find the maximum internal power dissipation supported by the IC packaging. If the result of Equation 1 is greater than that of Equation 2, then either the supply voltage must be decreased, the load impedance increased or TA reduced.
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LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 Also, careful consideration must be taken in selecting a certain type of capacitor to be used in the system. Different types of capacitors (tantalum, electrolytic, ceramic) have unique performance characteristics and may affect overall system performance. Bypass Capacitor Value Selection Besides minimizing the input capacitor size, careful consideration should be paid to the value of CB, the capacitor connected to the BYPASS pin.
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LM4809, LM4809LQBD SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com AUDIO POWER AMPLIFIER DESIGN Design a Dual 70mW/32Ω Audio Amplifier Given: Power Output 70 mW Load Impedance 32Ω Input Level 1 Vrms (max) Input Impedance 20kΩ Bandwidth 100 Hz–20 kHz ± 0.50dB The design begins by specifying the minimum supply voltage necessary to obtain the specified output power. One way to find the minimum supply voltage is to use Figure 28 in the Typical Performance Characteristics section.
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LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 The last step in this design is setting the amplifier's −3db frequency bandwidth. To achieve the desired ±0.25dB pass band magnitude variation limit, the low frequency response must extend to at lease one−fifth the lower bandwidth limit and the high frequency response must extend to at least five times the upper bandwidth limit. The gain variation for both response limits is 0.17dB, well within the ±0.25dB desired limit.
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LM4809, LM4809LQBD SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com Demonstration Board Schematic Figure 42. LM4809 Demonstration Board Schematic Demonstration Board Layout Figure 43.
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LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 Figure 44. Recommended DGK0008A PC Board Layout Component-Side Layout Figure 45. Recommended DGK0008A PC Board Layout Bottom-Side Layout Figure 46.
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LM4809, LM4809LQBD SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com Figure 47. Recommended NGL0008B PC Board Layout Component-Side Layout Figure 48. Recommended NGL0008B PC Board Layout Bottom-Side Layout Figure 49.
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LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 Figure 50. Recommended NGP0008A PC Board Layout Component-Side Layout Figure 51.
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LM4809, LM4809LQBD SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision E (April 2013) to Revision F • 22 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 26-Aug-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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PACKAGE MATERIALS INFORMATION www.ti.com 12-Aug-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 LM4809LDX/NOPB WSON NGL 8 4500 330.0 12.4 2.8 2.8 1.0 8.0 12.0 Q1 LM4809MM/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LM4809MMX/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 12-Aug-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM4809LDX/NOPB WSON NGL 8 4500 367.0 367.0 35.0 LM4809MM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LM4809MMX/NOPB VSSOP DGK 8 3500 367.0 367.0 35.
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MECHANICAL DATA NGL0008B LDA08B (Rev B) www.ti.
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