QuickView - MAX9775, MAX9776 2 x 1.5W, Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier

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Description

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The MAX9775/MAX9776 combine a high-efficiency Class D, stereo/mono audio power amplifier with a mono DirectDrive® receiver amplifier and a stereo DirectDrive headphone amplifier.

Maxim's 3rd-generation, ultra-low-EMI, Class D audio power amplifiers provide Class AB performance with Class D efficiency. The MAX9775/MAX9776 deliver 1.5W per channel into a 4Ω load from a 5V supply and offer efficiencies up to 79%. Active emissions limiting circuitry and spread-spectrum modulation greatly reduce EMI, eliminating the need for output filtering found in traditional Class D devices.

The MAX9775/MAX9776 utilize a fully differential architecture, a full-bridged output, and comprehensive click-and-pop suppression. A 3D stereo enhancement function allows the MAX9775 to widen the stereo sound field immersing the listener in a cleaner, richer sound experience than typically found in portable applications. The devices utilize a flexible, user-defined mixer architecture that includes an input mixer, volume control, and output mixer. All control is done through I²C.

The mono receiver amplifier and stereo headphone amplifier use Maxim's patented† DirectDrive architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, space, and component height.

The MAX9775 is available in a 36-bump WLP (3mm x 3mm) package. The MAX9776 is available in a 32-pin TQFN (5mm x 5mm) or a 36-bump WLP (3mm x 3mm) package. Both devices are specified over the extended -40°C to +85°C temperature range.

Key Features

Applications/Uses

Unique Spread-Spectrum Modulation and Active Emissions Limiting Significantly Reduces EMI
3D Stereo Enhancement (MAX9775 Only)
Up to 3 Stereo Inputs
1.5W Stereo Speaker Output (4Ω, V_DD = 5V)
50mW Mono Receiver/Stereo Headphone Outputs (32Ω, V_DD = 3.3V)
High PSRR (68dB at 217Hz)
79% Efficiency (V_DD = 3.3V, R_L = 8Ω, P_OUT = 470mW)
I²C Control—Input Configuration, Volume Control, Output Mode
Click-and-Pop Suppression
Low Total Harmonic Distortion (0.03% at 1kHz)
Current-Limit and Thermal Protection
Available in Space-Saving, 36-Bump WLP (3mm x 3mm) and 32-Pin TQFN (5mm x 5mm) Packages

	Cell Phones—Mid and High Tier
	Handheld Gaming Consoles
	Portable Multimedia Players

Key Specifications: Integrated Amplifiers

Part Number

Functions

Class

Speaker Amp. V_CC (min) (V)

Speaker Amp. V_CC (max) (V)

Speaker Amp. I_CC (typ) (mA)

Speaker Amp. P_OUT (W)

Speaker Amp. Half Pwr. THD+N (%)

Headphone Amp. V_CC (min) (V)

Headphone Amp. V_CC (max) (V)

Headphone Amp. I_CC (typ) (mA)

Hdph. Amp. P_OUT into 32Ω @1% THD+N (mW)

Headphone Amp. Half Pwr. THD+N (%)

Features

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX9775

•	Mobile Communication Subsystem

2.7

5.5

9.5

1.5

0.04

2.7

5.5

0.05

0.02

•	3D Stereo Enhancement

0/0

$1.05 @ 1k

MAX9776

0/0
TQFN/32

$1.00 @ 1k

See All Integrated Amplifiers (11)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.