Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Audio amplifier 2-channel (stereo) with stereo headphones Class D WQFN 32 (

LM49450

www.ti.com

SNAS440D –FEBRUARY 2008–REVISED MAY 2013

LM49450 Boomer ™ I

S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-

System with Ground Referenced Headphone Amplifier, 3D Enhancement, and Headphone

Sense

Check for Samples: LM49450

FEATURES

KEY SPECIFICATIONS

• 24–Bit Stereo DAC

• SNR at Headphone Output: 102dBA (typ)

• Stereo Filterless Class D Operation • Speaker Amplifier Efficiency at 3.6V,

650mW/Channel into 8Ω: 87% (typ)

• Selectable Spread Spectrum Mode Reduces

EMI • Speaker Amplifier Efficiency at 5V,

1.1W/Channel into 8Ω: 80% (typ)

• Ground Referenced Headphone Amplifiers

with 100dB SNR • Quiescent Power Supply Current Line Inputs:

• I

S Compatible Audio Interface – Speaker Mode at LSVDD = 3.6V: 7.5mA

(typ)

• Audio Sample Rates up to 192kHz

– Headphone Mode at HPVDD = 2.5V: 5.3mA

• TI’s 3D Enhancement

(typ)

• 32-Step Digital Volume Control

• Output Power/Channel Speaker at LSV

= 5V:

• I

C-Compatible Control Interface

– R

= 4Ω, THD+N ≤ 10%: 2.5W (typ)

• Headphone Sense Input

– R

= 8Ω, THD+N ≤ 1%: 1.25W (typ)

• Stereo Analog Line Inputs

• Headphone at HPV

= 2.5V:

• Output Short Circuit Protection

– R

= 16Ω, THD+N ≤ 1%: 34mW (typ)

• Thermal Overload Protection

– R

= 32Ω, THD+N ≤ 1%: 36mW (typ)

• Minimum External Components

• PSRR at 1kHz

• Click and Pop Suppression

– Speaker Mode: 67dB ( typ)

• Micro-Power Shutdown

– Headphone Mode: 77dB (typ)

• Available in Space-Saving 32-Pin WQFN

• Shutdown current: 0.02μA (typ)

Package

DESCRIPTION

APPLICATIONS

The LM49450 is a fully integrated audio subsystem

• Portable Media Players

designed for portable media player applications. The

• Portable Navigation Devices

LM49450 combines a 24-bit I

S digital-to-analog

converter (DAC), 2.5W/channel stereo Class D

• Multi-Media Monitors

speaker drivers, 36mW stereo ground referenced

• Laptops

headphone drivers, volume control, and TI’s unique

• Portable Gaming Devices

3D sound enhancement into a single device.

• Mobile Handsets

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.

2 is a trademark of ~ Texas Instruments.

3All other 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 (42 pages)

PAGE 1
LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 LM49450 Boomer ™ I2S Input, 2.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com DESCRIPTION (CONTINUED) The filterless Class D amplifiers deliver 1.25W/channel into an 8Ω load with <1% THD+N with a 5V supply. The LM49450 offers two logic selectable modulation schemes, fixed frequency mode, and an EMI reducing spread spectrum mode.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 CPVDD C1N HPVSS HPL HPVDD HPR HPS HPGND 32 31 30 29 28 27 26 25 Connection Diagram I2S_WS 5 20 LLS- I2S_SDI 6 19 LLS+ I2S_CLK 7 18 LSVDD MCLK 8 17 BYPASS 16 LSGND VDD 21 15 4 INL DGND 14 RLS- INR 22 13 3 REF SDA 12 RLS+ GND 23 11 2 IOVDD CPGND 10 LSVDD DVDD 24 9 1 SCL C1P Figure 2. RTV Package Top View 5mm x 5mm x 0.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com Absolute Maximum Ratings (1) (2) (3) Supply Voltage (1) 6.0V −65°C to +150°C Storage Temperature Input Voltage –0.3V to VDD +0.3V Power Dissipation (4) Internally Limited (5) 2000V ESD Susceptibility ESD Susceptibility (6) 200V Junction Temperature (TJMAX) 150°C Thermal Resistance (1) (2) (3) (4) (5) (6) θJC 2.4°C/W θJA 28.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Electrical Characteristics VDD = LSVDD = 3.6V, HPVDD = CPVDD = 2.5V (1) (2) The following specifications apply for Headphone: AV = 0dB, RL(LS) = 8Ω, RL(HP) = 32Ω, f = 1kHz, C1 = C2 = 2.2μF, unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions DIDD Digital Core Supply Current DVDD = 2.7V, fS = 48kHz, fMCLK = 12.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com Electrical Characteristics VDD = LSVDD = 3.6V, HPVDD = CPVDD = 2.5V(1)(2) (continued) The following specifications apply for Headphone: AV = 0dB, RL(LS) = 8Ω, RL(HP) = 32Ω, f = 1kHz, C1 = C2 = 2.2μF, unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM49450 Typical (3) Limit (4) Units (Limits) Input Referred, A-weighted εOS Output Noise DAC Active, Internal Reference 43.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Electrical Characteristics VDD = LSVDD = 3.6V, HPVDD = CPVDD = 2.5V(1)(2) (continued) The following specifications apply for Headphone: AV = 0dB, RL(LS) = 8Ω, RL(HP) = 32Ω, f = 1kHz, C1 = C2 = 2.2μF, unless otherwise specified. Limits apply for TA = 25°C.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com Electrical Characteristics VDD = LSVDD = 5.0V(1)(2) (continued) The following specifications apply for Headphone: AV = 0dB, RL(LS) = 8Ω, RL(HP) = 32Ω, f = 1kHz, unless otherwise specified. Limits apply for TA = 25°C.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Timing Characteristics(1)(2) (continued) The following specifications apply for Headphone: AV = 0dB, RL(LS) = 8Ω, RL(HP) = 32Ω, f = 1kHz, unless otherwise specified. Limits apply for TA = 25°C. LM49450 Limit (4) Units (Limits) 10 ns (min) SCLK Frequency 400 kHz (max) 1 Hold Time (repeated START Condition) 0.6 μs (min) 2 Clock Low Time 1.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Typical Performance Characteristics THD+N vs Frequency VDD = 3.0V, POUT = 150mW, RL = 8Ω DAC Input, Internal Reference, Speaker Mode 100 100 10 10 THD+N (%) THD+N (%) THD+N vs Frequency VDD = 3.0V, POUT = 50mW, RL = 4Ω DAC Input, Internal Reference, Speaker Mode 1 0.1 0.01 100 1000 10000 0.001 10 100000 100 1000 10000 100000 FREQUENCY (Hz) FREQUENCY (Hz) Figure 3. Figure 4. THD+N vs Frequency VDD = 3.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) THD+N vs Frequency VDD = 3.6V, POUT = 100mW, RL = 4Ω DAC Input, External Reference, Speaker Mode 100 100 10 10 THD+N (%) THD+N (%) THD+N vs Frequency VDD = 3.6V, POUT = 100mW, RL = 4Ω DAC Input, Internal Reference, Speaker Mode 1 0.1 0.01 1000 10000 0.001 10 100000 100 1000 10000 100000 FREQUENCY (Hz) FREQUENCY (Hz) Figure 9. Figure 10. THD+N vs Frequency VDD = 3.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Typical Performance Characteristics (continued) THD+N vs Frequency VDD = 5.0V, POUT = 750mW, RL = 4Ω DAC Input, External Reference, Speaker Mode 100 100 10 10 THD+N (%) THD+N (%) THD+N vs Frequency VDD = 5.0V, POUT = 750mW, RL = 4Ω DAC Input, Internal Reference, Speaker Mode 1 0.1 0.01 100 1000 10000 0.001 10 100000 100 1000 10000 100000 FREQUENCY (Hz) FREQUENCY (Hz) Figure 15. Figure 16. THD+N vs Frequency VDD = 5.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) THD+N vs Frequency HPVDD = 2.5V, POUT = 25mW, RL = 16Ω DAC Input, Internal Reference, Headphone Mode 100 100 10 10 THD+N (%) THD+N (%) THD+N vs Frequency HPVDD = 2.0V, POUT = 10mW, RL = 16Ω DAC Input, Internal Reference, Headphone Mode 1 0.1 0.01 0.001 10 1 0.1 0.01 100 1000 10000 0.001 10 100000 100 FREQUENCY (Hz) 10000 100000 FREQUENCY (Hz) Figure 22.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Typical Performance Characteristics (continued) THD+N vs Frequency HPVDD = 2.0V, POUT = 25mW, RL = 32Ω DAC Input, External Reference, Headphone Mode 100 100 10 10 THD+N (%) THD+N (%) THD+N vs Frequency HPVDD = 2.0V, POUT = 15mW, RL = 32Ω DAC Input, External Reference, Headphone Mode 1 0.1 0.01 0.001 10 1 0.1 0.01 100 1000 10000 0.001 10 100000 100 100000 FREQUENCY (Hz) Figure 28. THD+N vs Frequency HPVDD = 2.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) THD+N vs Output Power AV = 12dB, RL = 4Ω, f = 1kHz DAC Input, Internal Reference, Speaker Mode THD+N vs Output Power AV = 12dB, RL = 4Ω, f = 1kHz DAC Input, External Reference, Speaker Mode 100 100 VDD = 5V VDD = 5V 1 10 VDD = 3.6V THD+N (%) THD+N (%) 10 VDD = 3.0V 0.1 0.01 0.001 VDD = 3.6V 1 VDD = 3.0V 0.1 0.01 0.1 1 0.01 0.001 10 OUTPUT POWER (W) 0.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Typical Performance Characteristics (continued) THD+N vs Output Power AV = 9dB, RL = 16Ω, f = 1kHz DAC Input, Internal Reference, Headphone Mode THD+N vs Output Power AV = 9dB, RL = 16Ω, f = 1kHz DAC Input, External Reference, Headphone Mode 100 100 TWO CHANNELS IN PHASE HPV TWO CHANNELS IN PHASE HPV DD = 2.5V DD = 2.5V 10 THD+N (%) THD+N (%) 10 HPVDD = 2.0V 1 0.1 HPVDD = 2.0V 1 0.1 0.01 0.001 0.01 0.01 0.001 0.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) PSRR vs Frequency VDD = 3.6V, VRIPPLE = 200mVP-P, RL = 8Ω DAC Input, External Reference, Speaker Mode PSRR vs Frequency VDD = 3.6V, VRIPPLE = 200mVP-P, RL = 8Ω Analog Input, Speaker Mode 0 0 -10 -10 -20 PSRR (dB) PSRR (dB) -20 -30 -40 -30 -40 -50 -60 -50 -70 -60 -80 -70 10 100 1000 10000 -90 10 100000 100 1000 10000 100000 FREQUENCY (Hz) FREQUENCY (Hz) Figure 45.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Typical Performance Characteristics (continued) Power Dissipation vs Output Power RL = 4Ω, f = 1kHz, Speaker Mode Power Dissipation vs Output Power RL = 8Ω, f = 1kHz, Speaker Mode 500 POWER DISSIPATION (mW) POWER DISSIPATION (mW) 1000 VDD = 5V 750 VDD = 3.6V 500 VDD = 3.0V 250 400 VDD = 5V 300 200 VDD = 3.0V 100 VDD = 3.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) Output Power vs Supply Voltage RL = 16Ω, f = 1kHz, Headphone Mode Output Power vs Supply Voltage RL = 32Ω, f = 1kHz, Headphone Mode 50 50 THD+N = 10% THD+N = 10% 30 20 THD+N = 1% 10 0 1.8 1.95 2.1 2.25 2.4 2.55 40 OUTPUT POWER (mW) OUTPUT POWER (mW) 40 30 20 THD+N = 1% 10 0 1.8 2.7 SUPPLY VOLTAGE (V) 1.95 2.1 2.4 2.55 Output Noise vs Frequency VDD = 3.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Typical Performance Characteristics (continued) Crosstalk vs Frequency VDD = 2.5V, VRIPPLE = 1VP-P, RL = 8Ω Analog Input, Headphone Mode 0 0 -10 -10 -20 -20 -30 -30 CROSSTALK (dB) CROSSTALK (dB) Crosstalk vs Frequency VDD = 3.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com APPLICATION INFORMATION I2C-COMPATIBLE INTERFACE The LM49450 is controlled through an I2C-compatible serial interface that consists of a serial data line (SDA) and a serial clock (SCL). The clock line is uni-directional. The data line is bi-directional (open collector). The LM49450 and the master can communicate at clock rates up to 400kHz. Figure 65 shows the I2C interface timing diagram.
PAGE 23
LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Once the master device registers the ACK bit, the 8-bit register address word is sent. Each data bit should be stable while SCL is HIGH. After the 8-bit register address is sent, the LM49450 sends another ACK bit. Following the acknowledgement of the register address, the 8-bit register data word is sent. Each data bit should be stable while SCL is HIGH. After the 8-bit register data is sent, the LM49450 sends another ACK bit.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com GENERAL AMPLIFIER FUNCTION Class D Amplifier The LM49450 features a high-efficiency stereo Class D audio power amplifier that utilizes TI’s filterless modulation scheme which reduces external component count, conserves board space and reduces system cost. The Class D outputs transition between VDD and GND with a 300kHz switching frequency.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 The LM49450 3D function is controlled through the I2C interface. The headphone and speakers have independent 3D controls, allowing each signal path to have its own individual 3D configuration. The LM49450 3D features two effect modes, a narrow effect that decreases the channel separation, making the speakers sound closer together, and a wide effect that makes the speakers sound farther apart.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com Low Power Shutdown The LM49450 features an I2C selectable low power shutdown mode that disables the entire device, reducing quiescent current consumption to 0.05µA (digital + analog current). Set bit B0 in the mode control register (0x00h) to 0 to disable the device. Set B0 to 1 to enable the device.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Table 1.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com Table 3. Clock Control Register (continued) Bit Name RDIV_5 RDIV_4 RDIV_3 RDIV_2 RDIV_1 RDIV_0 B5:B0 (B5) (B4) (B3) (B2) (B1) (B0) Value Description B5 B4 B3 B2 B1 B0 Sets MCLK divider ratio 0 0 0 0 0 0 Bypass divider 0 0 0 0 0 1 1 0 0 0 0 1 0 1.5 0 0 0 0 1 1 2 0 0 0 1 0 0 2.5 0 0 0 1 0 1 5 1 1 1 1 0 1 31 1 1 1 1 1 0 31.5 1 1 1 1 1 1 32 TO In 0.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Common Clock Settings for the DAC In DAC_MODE 0, the DAC has an oversampling rate (OSR) of 125 but requires a 250xfs clock at point B. This allows a simple clocking solution as it will work from 12.000MHz (common in most systems with Bluetooth or USB) at 48kHz exactly. In the other DAC modes, the DAC requires a conventional 2^Nxfs clock for conversation.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com Table 7. CP_DIV Default Value 0x49h Bits Field Description 7:0 CP_DIV Programs the CP divider (devides from an expected 12.000MHz input). CP_DIV Divide Value 0 Bypass 1 1 2 1.5 3 2 4 2.5 5 to 253 3 to 127 254 127.5 255 128 Examples of CP_DIV Values one might use for various sample rates and DAC modes Table 8. Typical CP_DIV Values for DAC Mode 00 MCLK (MHZ) CP_DIV Nominal Frequency (Hz) 2 11 333333 2.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 I2S MODE CONTROL REGISTER (0x03h) Default value is 0x00h. Table 12. I2S Mode Control Register Bit Name Value B7 RESERVED X B6:B4 B3 B2 B1:B0 I2S_WRD_2 (B6) I2S_WRD_1 (B5) I2S_WRD_0 (B5) Description Unused B5 B4 0 0 0 16 0 0 1 18 0 1 0 20 0 1 1 22 1 0 0 24 1 0 1 25 1 1 0 26 1 1 1 32 0 Normal mode. Left channel data goes to left channel output Right channel data goes to right channel output.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com I2S CLOCK REGISTER (0x04h) Default value is 0x00h. Table 13. I2S Clock Register Bit Name B7:B4 Value I2S_CLK_3 (B7) I2S_CLK_2 (B6) I2S_CLK_1 (B5) I2S_CLK_0 (B4) B7 B6 B5 B4 DIVIDE BY RATIO 0 0 0 0 1 — 0 0 0 1 2 — 0 0 1 0 4 — 0 1 1 1 6 — 0 0 0 0 8 — 0 0 1 1 10 — 0 1 0 0 16 — 0 1 1 1 20 — 1 0 0 0 2.5 2.5 1 0 0 1 3 1:3 1 0 1 0 3.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 Table 14. Headphone 3D Configuration Register (continued) Bit B5:B4 B3:B2 B1 B0 Name Value HP_3DFREQ_1 (B5) HP_3DFREQ_0 (B4) HP_3DFREQ_1 (B3) HP_3DFREQ_0 (B2) Description B5 B4 Sets 3D high pass filter -3dB (roll-off) frequency 0 0 0 0 1 300Hz 1 0 600Hz 1 1 900Hz Sets the 3D mix level, ie the amount of the left channel signal that appears on the right channel and visa versa. B3 B2 0 0 25% 0 1 37.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com HEADPHONE VOLUME CONTROL REGISTER (0x07h) Default value is 0x00h. Table 16. Headphone Volume Control Register 34 Bit Name Value B7:B5 RESERVED X B4:B0 HP4 (B4) HP3 (B3) HP2 (B2) HP1 (B1) HP0 (B0) Description UNUSED See Headphone Volume Control Table Controls gain/attenuation of the audio signal in the headphone path.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 LOUDSPEAKER VOLUME CONTROL REGISTER (0x08h) Default value is 0x00h. Table 17. Loudspeaker Volume Control Register Bit Name Value B7:B5 RESERVED X B4:B0 LS4 (B4) LS3 (B3) LS2 (B2) LS1 (B1) LS0 (B0) Description UNUSED See Headphone Volume Control Table Controls gain/attenuation of the audio signal in the loudspeaker path.
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LM49450 SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 www.ti.com DAC COMPENSATION FILTER REGISTERS (0x09h to 0x0Eh) DAC Compensation Filter The LM49450 DAC features a 5 band FIR filter that can be used as an equalizer for the digital audio path. Registers 0x09h, 0x0Ah, 0x0Bh, 0x0Ch, 0x0Dh, and 0x0Eh provide an 8-bit control for each individual FIR filter.
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LM49450 www.ti.com SNAS440D – FEBRUARY 2008 – REVISED MAY 2013 f = 1 / 2πRINCIN where • the value of RIN is typically 20kΩ (1) The input capacitors can also be used to remove low frequency content from the audio signal. Small speakers cannot reproduce, and may even be damaged by low frequencies. High pass filtering the audio signal helps protect the speakers. When the LM49450 is using a single-ended source, power supply noise on the ground is seen as an input signal.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-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 LM49450SQ/NOPB WQFN RTV 32 1000 178.0 12.4 5.3 5.3 1.3 8.0 12.0 Q1 LM49450SQX/NOPB WQFN RTV 32 4500 330.0 12.4 5.3 5.3 1.3 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM49450SQ/NOPB WQFN RTV 32 1000 210.0 185.0 35.0 LM49450SQX/NOPB WQFN RTV 32 4500 367.0 367.0 35.
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MECHANICAL DATA RTV0032A SQA32A (Rev B) www.ti.
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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.