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Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers

36% Smaller, 68% More Efficient—Industry's First Class D Vista-Compliant Notebook Audio Subsystem

Product Details

Key Features

Parametric specs for Integrated Amplifiers
Functions Mobile Communication Subsystem
Netbook Subsystem
PC Notebook Subsystem
Class D
Spkr. Amp. VCC (V) (min) 4.5
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 14
Spkr. Amp. POUT (W) 3
Spkr. Amp. Half Pwr. THD+N (%) 0.03
Headphone Amplifier VCC (V) (min) 2.7
Headphone Amplifier ICC (mA) (typ) 5.5
Hdph. Amp. POUT into 32Ω (mW) (@ 1% THD+N) 0.18
Headphone Amplifier Half-Power THD+N (%) 0.006
Package/Pins TQFN/28
Budgetary
Price (See Notes)
1.77
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Simplified Block Diagram

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Parameters

Parametric specs for Integrated Amplifiers
Functions Mobile Communication Subsystem
Netbook Subsystem
PC Notebook Subsystem
Class D
Spkr. Amp. VCC (V) (min) 4.5
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 14
Spkr. Amp. POUT (W) 3
Spkr. Amp. Half Pwr. THD+N (%) 0.03
Headphone Amplifier VCC (V) (min) 2.7
Headphone Amplifier ICC (mA) (typ) 5.5
Hdph. Amp. POUT into 32Ω (mW) (@ 1% THD+N) 0.18
Headphone Amplifier Half-Power THD+N (%) 0.006
Package/Pins TQFN/28
Budgetary
Price (See Notes)
1.77

Key Features

  • Windows Vista® Premium Compliant
  • Low EMI Filterless Class D Speaker Amplifiers Pass EN55022B Emissions Limit with 30cm of Speaker Cable
  • 180mW DirectDrive Headphone Amplifier
  • Excellent RF Immunity
  • Integrated 120mA LDO
  • Eliminates Headphone Ground Loop Noise
  • Wake-on-Beep Function
  • Click-and-Pop Suppression
  • Short-Circuit and Thermal-Overload Protection
  • Thermally Efficient, Space-Saving Package
    • 28-Pin TQFN-EP (4mm x 4mm x 0.75mm)

Applications/Uses

  • Notebook Computers
  • Portable Multimedia Players
  • Tablet PCs

Description

The MAX9791 combines a stereo 2W Class D power amplifier, a stereo 180mW DirectDrive® headphone amplifier, and a 120mA low-dropout (LDO) linear regulator in a single device. The MAX9792 combines a mono 3W Class D power amplifier, a stereo 180mW DirectDrive headphone amplifier, and a 120mA LDO linear regulator in a single device.

The MAX9791/MAX9792 feature Maxim's DirectDrive headphone amplifier architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. High 107dB DC PSRR and low 0.006% THD+N ensure clean, low-distortion amplification of the audio signal.

The ground sense feature senses and corrects for the voltage difference between the output jack ground and device signal ground. This feature minimizes headphone amplifier crosstalk by sensing the impedance in the ground return trace and correcting for it at the output jack. This feature also minimizes ground-loop noise when the output socket is used as a line out connection to other grounded equipment (for example, a PC connected to a home hi-fi system).

The MAX9791/MAX9792 feature low RF susceptibility, allowing the amplifiers to successfully operate in close proximity to wireless applications. The MAX9791/MAX9792 Class D amplifiers feature Maxim's spread-spectrum modulation and active emissions limiting circuitry. Industry-leading click-and-pop suppression eliminates audible transients during power-up and shutdown cycles.

The MAX9791/MAX9792 wake-on-beep feature wakes up the speaker and headphone amplifiers when a qualified beep signal is detected at the BEEP input.

For maximum flexibility, separate speaker and headphone amplifier control inputs provide independent shutdown of the speaker and headphone amplifiers. Additionally the LDO can be enabled independently of the audio amplifiers.

The MAX9791/MAX9792 feature thermal-overload and output short-circuit protection. The devices are available in 28-pin TQFN packages and are specified over the -40°C to +85°C extended temperature range.

Simplified Block Diagram

MAX9791, MAX9792: Simplified Block Diagram MAX9791, MAX9792: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.