LM49251

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1,37-W-Stereo-Kopfhörerverstärker (Klasse AB) mit Analogeingang und 20 mW

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Datenblatt

document-pdfAcrobat Stereo Audio w/Class G Headphone Amp & Class D Speaker Amp w/Speaker Protection datasheet (Rev. A) (Englisch)

LM49251

AKTIV

Datenblatt

Jetzt bestellen

Produktdetails

Audio input type

Analog 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)

1.37

SNR (dB)

98

THD + N at 1 kHz (%)

0.02

Iq (typ) (mA)

1.15

Control interface

I2C

Closed/open loop

Open

Analog supply (min) (V)

2.7

Analog supply voltage (max) (V)

5.5

PSRR (dB)

93

Operating temperature range (°C)

-40 to 85

Audio input type

Analog 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)

1.37

SNR (dB)

98

THD + N at 1 kHz (%)

0.02

Iq (typ) (mA)

1.15

Control interface

I2C

Closed/open loop

Open

Analog supply (min) (V)

2.7

Analog supply voltage (max) (V)

5.5

PSRR (dB)

93

Operating temperature range (°C)

-40 to 85

DSBGA (YZR)

30

8.9375 mm² 3.25 x 2.75

Class G Ground Referenced Headphone Outputs
E²S Class D Amplifier
No Clip Function
Power Limiter Speaker Protection
I²C Volume and Mode Control
Advanced Click-and-Pop Suppression
Micro-Power Shutdown

Key Specifications

Class G Headphone Amplifier, HPV_DD = 1.8V, R_L = 32Ω
- IDDQ_HP: 1.15 mA (Typ)
- Output Power, THD+N ≤ 1%: 20 mW (Typ)
Stereo Class D Speaker Amplifier R_L = 8Ω
- Output Power, THD+N ≤ 1%, LSV_DD = 5.0V: 1.37 W (Typ)
- Output Power, THD+N ≤ 1%, LSV_DD = 3.6V: 680 mW (Typ)
- Efficiency: 90% (Typ)

All trademarks are the property of their respective owners.

Class G Ground Referenced Headphone Outputs
E²S Class D Amplifier
No Clip Function
Power Limiter Speaker Protection
I²C Volume and Mode Control
Advanced Click-and-Pop Suppression
Micro-Power Shutdown

Key Specifications

Class G Headphone Amplifier, HPV_DD = 1.8V, R_L = 32Ω
- IDDQ_HP: 1.15 mA (Typ)
- Output Power, THD+N ≤ 1%: 20 mW (Typ)
Stereo Class D Speaker Amplifier R_L = 8Ω
- Output Power, THD+N ≤ 1%, LSV_DD = 5.0V: 1.37 W (Typ)
- Output Power, THD+N ≤ 1%, LSV_DD = 3.6V: 680 mW (Typ)
- Efficiency: 90% (Typ)

All trademarks are the property of their respective owners.

The LM49251 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. Part of TI’s PowerWise family of products, the LM49251 utilizes a high efficiency class G headphone amplifier topology as well as a high efficiency class D loudspeaker.

The headphone amplifiers feature TI’s class G ground referenced architecture that creates a ground-referenced output with dynamic supply rails for optimum efficiency. The stereo class D speaker amplifier provides both a no-clip feature and speaker protection. The Enhanced Emission Suppression (E²S) outputs feature a patented, ultra low EMI PWM architecture that significantly reduces RF emissions.

The LM49251 features separate volume controls for the mono and stereo inputs. Mode selection, shutdown control, and volume are controlled through an I²C compatible interface.

Click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49251 is available in an ultra-small 30-bump DSBGA package (2.55mmx3.02mm)

The LM49251 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. Part of TI’s PowerWise family of products, the LM49251 utilizes a high efficiency class G headphone amplifier topology as well as a high efficiency class D loudspeaker.

The headphone amplifiers feature TI’s class G ground referenced architecture that creates a ground-referenced output with dynamic supply rails for optimum efficiency. The stereo class D speaker amplifier provides both a no-clip feature and speaker protection. The Enhanced Emission Suppression (E²S) outputs feature a patented, ultra low EMI PWM architecture that significantly reduces RF emissions.

The LM49251 features separate volume controls for the mono and stereo inputs. Mode selection, shutdown control, and volume are controlled through an I²C compatible interface.

Click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49251 is available in an ultra-small 30-bump DSBGA package (2.55mmx3.02mm)

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	Typ	Titel		Datum
*	Data sheet	Stereo Audio w/Class G Headphone Amp & Class D Speaker Amp w/Speaker Protection datasheet (Rev. A)		06 Apr 2013

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LM49251

1,37-W-Stereo-Kopfhörerverstärker (Klasse AB) mit Analogeingang und 20 mW

LM49251

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Design und Entwicklung

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