LM49450

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2,5-W-Stereo-Class-D-Verstärker mit Digital-Eingang, 36-mW-Kopfhörerverstärker und 3D-Erweiterung

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Datenblatt

document-pdfAcrobat I2S, 2.5W/Ch, Low EMI, Stereo, Class D w/Gnd Ref Headphone Amp, 3D Enhancement datasheet (Rev. D) (Englisch)

LM49450

AKTIV

Datenblatt

Jetzt bestellen

Produktdetails

Audio input type

Analog Input, Digital Input

Architecture

Class-D

Speaker channels (max)

Stereo

Rating

Catalog

Power stage supply (max) (V)

5.5

Power stage supply (min) (V)

2.7

Load (min) (Ω)

4

Output power (W)

1.1

THD + N at 1 kHz (%)

0.06

Iq (typ) (mA)

5.3

Control interface

I2C

Closed/open loop

Closed

Analog supply (min) (V)

2.7

Analog supply voltage (max) (V)

5.5

Sampling rate (max) (kHz)

192

PSRR (dB)

77

Operating temperature range (°C)

-40 to 85

Audio input type

Analog Input, Digital Input

Architecture

Class-D

Speaker channels (max)

Stereo

Rating

Catalog

Power stage supply (max) (V)

5.5

Power stage supply (min) (V)

2.7

Load (min) (Ω)

4

Output power (W)

1.1

THD + N at 1 kHz (%)

0.06

Iq (typ) (mA)

5.3

Control interface

I2C

Closed/open loop

Closed

Analog supply (min) (V)

2.7

Analog supply voltage (max) (V)

5.5

Sampling rate (max) (kHz)

192

PSRR (dB)

77

Operating temperature range (°C)

-40 to 85

WQFN (RTV)

32

25 mm² 5 x 5

24–Bit Stereo DAC
Stereo Filterless Class D Operation
Selectable Spread Spectrum Mode Reduces EMI
Ground Referenced Headphone Amplifiers with 100dB SNR
I²S Compatible Audio Interface
Audio Sample Rates up to 192kHz
TI’s 3D Enhancement
32-Step Digital Volume Control
I²C-Compatible Control Interface
Headphone Sense Input
Stereo Analog Line Inputs
Output Short Circuit Protection
Thermal Overload Protection
Minimum External Components
Click and Pop Suppression
Micro-Power Shutdown
Available in Space-Saving 32-Pin WQFN Package

Key Specifications

SNR at Headphone Output: 102dBA (typ)
Speaker Amplifier Efficiency at 3.6V, 650mW/Channel into 8Ω: 87% (typ)
Speaker Amplifier Efficiency at 5V, 1.1W/Channel into 8Ω: 80% (typ)
Quiescent Power Supply Current Line Inputs:
- Speaker Mode at LSVDD = 3.6V: 7.5mA (typ)
- Headphone Mode at HPVDD = 2.5V: 5.3mA (typ)
Output Power/Channel Speaker at LSV_DD = 5V:
- R_L = 4Ω, THD+N ≤ 10%: 2.5W (typ)
- R_L = 8Ω, THD+N ≤ 1%: 1.25W (typ)
Headphone at HPV_DD = 2.5V:
- R_L = 16Ω, THD+N ≤ 1%: 34mW (typ)
- R_L = 32Ω, THD+N ≤ 1%: 36mW (typ)
PSRR at 1kHz
- Speaker Mode: 67dB ( typ)
- Headphone Mode: 77dB (typ)
Shutdown current: 0.02μA (typ)

is a trademark of Texas Instruments. All trademarks are the property of their respective owners.

24–Bit Stereo DAC
Stereo Filterless Class D Operation
Selectable Spread Spectrum Mode Reduces EMI
Ground Referenced Headphone Amplifiers with 100dB SNR
I²S Compatible Audio Interface
Audio Sample Rates up to 192kHz
TI’s 3D Enhancement
32-Step Digital Volume Control
I²C-Compatible Control Interface
Headphone Sense Input
Stereo Analog Line Inputs
Output Short Circuit Protection
Thermal Overload Protection
Minimum External Components
Click and Pop Suppression
Micro-Power Shutdown
Available in Space-Saving 32-Pin WQFN Package

Key Specifications

SNR at Headphone Output: 102dBA (typ)
Speaker Amplifier Efficiency at 3.6V, 650mW/Channel into 8Ω: 87% (typ)
Speaker Amplifier Efficiency at 5V, 1.1W/Channel into 8Ω: 80% (typ)
Quiescent Power Supply Current Line Inputs:
- Speaker Mode at LSVDD = 3.6V: 7.5mA (typ)
- Headphone Mode at HPVDD = 2.5V: 5.3mA (typ)
Output Power/Channel Speaker at LSV_DD = 5V:
- R_L = 4Ω, THD+N ≤ 10%: 2.5W (typ)
- R_L = 8Ω, THD+N ≤ 1%: 1.25W (typ)
Headphone at HPV_DD = 2.5V:
- R_L = 16Ω, THD+N ≤ 1%: 34mW (typ)
- R_L = 32Ω, THD+N ≤ 1%: 36mW (typ)
PSRR at 1kHz
- Speaker Mode: 67dB ( typ)
- Headphone Mode: 77dB (typ)
Shutdown current: 0.02μA (typ)

is a trademark of Texas Instruments. All trademarks are the property of their respective owners.

The LM49450 is a fully integrated audio subsystem designed for portable media player applications. The LM49450 combines a 24-bit I²S digital-to-analog converter (DAC), 2.5W/channel stereo Class D speaker drivers, 36mW stereo ground referenced headphone drivers, volume control, and TI’s unique 3D sound enhancement into a single device.

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. The 36mW/channel headphone drivers feature TI’s ground referenced architecture that creates a ground-referenced output from a single supply, eliminating the need for bulky and expensive DC-blocking capacitors, saving space and minimizing system cost. A headphone sense input (HPS) automatically detects the presence of a headphone, and configures the device accordingly.

The LM49450 stereo, 24-bit DAC supports a wide range of sample rates (including 192kHz, 96kHz, 48kHz, and 44.1kHz). The digital audio signal path features better than 100dB SNR, and low 0.05% THD+N when measured at the headphone outputs. The flexible 3-wire I²S interface supports left or right justified audio data.

The LM49450 features separate 32-step volume control for the headphones and speaker outputs. 3D enhancement, mode selection, shutdown control, and volume are controlled through an I²C compatible interface.

Output short circuit and thermal overload protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49450 is available in a space saving 32-pin WQFN package.

The LM49450 is a fully integrated audio subsystem designed for portable media player applications. The LM49450 combines a 24-bit I²S digital-to-analog converter (DAC), 2.5W/channel stereo Class D speaker drivers, 36mW stereo ground referenced headphone drivers, volume control, and TI’s unique 3D sound enhancement into a single device.

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. The 36mW/channel headphone drivers feature TI’s ground referenced architecture that creates a ground-referenced output from a single supply, eliminating the need for bulky and expensive DC-blocking capacitors, saving space and minimizing system cost. A headphone sense input (HPS) automatically detects the presence of a headphone, and configures the device accordingly.

The LM49450 stereo, 24-bit DAC supports a wide range of sample rates (including 192kHz, 96kHz, 48kHz, and 44.1kHz). The digital audio signal path features better than 100dB SNR, and low 0.05% THD+N when measured at the headphone outputs. The flexible 3-wire I²S interface supports left or right justified audio data.

The LM49450 features separate 32-step volume control for the headphones and speaker outputs. 3D enhancement, mode selection, shutdown control, and volume are controlled through an I²C compatible interface.

Output short circuit and thermal overload protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49450 is available in a space saving 32-pin WQFN package.

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	Typ	Titel		Datum
*	Data sheet	I2S, 2.5W/Ch, Low EMI, Stereo, Class D w/Gnd Ref Headphone Amp, 3D Enhancement datasheet (Rev. D)		01 Mai 2013

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LM49450

2,5-W-Stereo-Class-D-Verstärker mit Digital-Eingang, 36-mW-Kopfhörerverstärker und 3D-Erweiterung

LM49450

Produktdetails

Key Specifications

Key Specifications

Technische Dokumentation

Design und Entwicklung

SNAC025 — LM49450 Software

Unterstützte Produkte und Hardware

Produkte

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SNAC025 — LM49450 Software

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