Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Audio amplifier Headphones (2-channel, stereo) Class AB VSSOP 10

LM4811

www.ti.com

SNAS119D –DECEMBER 2000–REVISED APRIL 2013

LM4811 Dual 105mW Headphone Amplifier with Digital

Volume Control and Shutdown Mode

Check for Samples: LM4811

FEATURES

DESCRIPTION

The LM4811 is a dual audio power amplifier capable

• Digital Volume Control Range from +12dB to

of delivering 105mW per channel of continuous

−33dB

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

• WSON and VSSOP Surface Mount Packaging

from a 5V power supply.

• "Click and Pop" Suppression Circuitry

Boomer audio power amplifiers were designed

• No Bootstrap Capacitors Required

specifically to provide high quality output power with a

minimal amount of external components. Since the

• Low Shutdown Current

LM4811 does not require bootstrap capacitors or

snubber networks, it is optimally suited for low-power

APPLICATIONS

portable systems.

• Cellular Phones

The LM4811 features a digital volume control that

• MP3, CD, DVD Players

sets the amplifier's gain from +12dB to −33dB in 16

• PDA's

discrete steps using a two−wire interface.

• Portable Electronics

The unity-gain stable LM4811 also features an

externally controlled, active-high, micropower

KEY SPECIFICATIONS

consumption shutdown mode. It also has an internal

thermal shutdown protection mechanism.

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

Output Power into 16Ω 0.1 % (typ)

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

Power into 32Ω 0.1 % (typ)

• Shutdown Current 0.3 μA (typ)

Connection Diagrams

Top View Top View

Figure 1. VSSOP Package Figure 2. WSON Package

See Package Number DGS0010A See Package Number NGY0010A

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 (24 pages)

PAGE 1
LM4811 www.ti.com SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 LM4811 Dual 105mW Headphone Amplifier with Digital Volume Control and Shutdown Mode Check for Samples: LM4811 FEATURES DESCRIPTION • The LM4811 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.
PAGE 2
LM4811 SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 www.ti.com Top View Figure 3. SON Package See Package Number NHD0010A Typical Application *Refer to Application Information for information concerning proper selection of the input and output coupling capacitors. Figure 4.
PAGE 3
LM4811 www.ti.com SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 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) ESD Susceptibility Machine model 2.5kV (4) 200V Junction Temperature (TJ) 150°C Vapor Phase (60 sec.
PAGE 4
LM4811 SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 www.ti.com Electrical Characteristics (1)(2) (continued) The following specifications apply for VDD = 5V unless otherwise specified, limits apply to TA = 25°C. Parameter VIL Test Conditions LM4811 Typ (3) Limit (CLOCK, UP/DN, SHUTDOWN) Input Voltage Low Digital Volume Range (4) 0.4 Units (Limits) V (max) Input referred minimum gain −33 dB Input referred maximum gain +12 dB Digital Volume Stepsize All 16 discrete steps 3.
PAGE 5
LM4811 www.ti.com SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 Electrical Characteristics (1) (2) The following specifications apply for VDD = 2.6V unless otherwise specified, limits apply to TA = 25°C. Parameter Test Conditions LM4811 Typ (3) Limit (4) Units (Limits) IDD Supply Current VIN = 0V, IO = 0A 1.0 ISD Shutdown Current VIN = 0V 0.3 mA µA VOS Output Offset Voltage VIN = 0V 4.0 mV Po Output Power 0.
PAGE 6
LM4811 SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics 6 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.
PAGE 7
LM4811 www.ti.com SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 Typical Performance Characteristics (continued) THD+N vs Frequency THD+N vs Frequency Figure 11. Figure 12. THD+N vs Frequency THD+N vs Output Power Figure 13. Figure 14. THD+N vs Output Power THD+N vs Output Power Figure 15. Figure 16.
PAGE 8
LM4811 SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 8 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.
PAGE 9
LM4811 www.ti.com SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Output Power vs Load Resistance Output Power vs Load Resistance Figure 23. Figure 24. Output Power vs Load Resistance Output Power vs Supply Voltage Figure 25. Figure 26. Output Power vs Power Supply Output Power vs Power Supply Figure 27. Figure 28.
PAGE 10
LM4811 SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 10 Dropout Voltage vs Supply Voltage Power Dissipation vs Output Power Figure 29. Figure 30. Power Dissipation vs Output Power Power Dissipation vs Output Power Figure 31. Figure 32. Channel Separation Channel Separation Figure 33. Figure 34.
PAGE 11
LM4811 www.ti.com SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Noise Floor Power Supply Rejection Ratio Figure 35. Figure 36. Power Supply Rejection Ratio Power Supply Rejection Ratio Figure 37. Figure 38. Frequency Response Supply Current vs Supply Voltage Figure 39. Figure 40.
PAGE 12
LM4811 SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 www.ti.com APPLICATION INFORMATION DIGITAL VOLUME CONTROL The LM4811's gain is controlled by the signals applied to the CLOCK and UP/DN inputs. An external clock is required to drive the CLOCK pin. At each rising edge of the clock signal, the gain will either increase or decrease by a 3dB step depending on the logic voltage level applied to the UP/DN pin.
PAGE 13
LM4811 www.ti.com SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 For the VSSOP package, θJA = 194°C/W, and for the WSON/SON package, θJA = 63°C/W. TJMAX = 150°C for the LM4811. For a given ambient temperature, TA, of the system surroundings, Equation 1 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.
PAGE 14
LM4811 SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 www.ti.com The LM4811's unity-gain stability allows a designer to maximize system performance. Low gain settings maximize signal-to-noise performance and minimizes THD+N. Low gain configurations require large input signals to obtain a given output power. Input signals equal to or greater than 1 Vrms are available from sources such as audio codecs. Please refer to AUDIO POWER AMPLIFIER DESIGN for a more complete explanation of proper gain selection.
PAGE 15
LM4811 www.ti.com SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 Using Figure 28 for a 32Ω load, the minimum supply rail is 4.8V. Since 5V is a standard supply voltage in most applications, it is chosen for the supply rail. Extra supply voltage creates headroom that allows the LM4811 to reproduce peaks in excess of 70mW without clipping the signal.
PAGE 16
LM4811 SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 www.ti.com Figure 42. Demo Board Schematic Figure 43.
PAGE 17
LM4811 www.ti.com SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 Figure 44. Recommended VSSOP PC Board Layout: TOP Top Layer Figure 45. Recommended VSSOP PC Board Layout: Bottom Layer Figure 46.
PAGE 18
LM4811 SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 www.ti.com Figure 47. Recommended WSON/SON PC Board Layout: TOP Top Layer Figure 48.
PAGE 19
LM4811 www.ti.com SNAS119D – DECEMBER 2000 – REVISED APRIL 2013 REVISION HISTORY Rev Date Description 0.1 04/06/06 Added NHD0010A Package and markings, then re-released D/S to the WEB (per Alvin F.). D 04/05/13 Changed layout of National Data Sheet to TI format.
PAGE 20
PACKAGE OPTION ADDENDUM www.ti.
PAGE 21
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 LM4811MM/NOPB VSSOP DGS 10 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LM4811MMX/NOPB VSSOP DGS 10 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.
PAGE 22
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) LM4811MM/NOPB VSSOP DGS 10 1000 210.0 185.0 35.0 LM4811MMX/NOPB VSSOP DGS 10 3500 367.0 367.0 35.
PAGE 23
PAGE 24
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.