QuickView - MAX9708 20W/40W, Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier

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Description

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The MAX9708 mono/stereo, Class D audio power amplifier delivers up to 2 x 21W into an 8

stereo mode and 1 x 42W into a 4

load in mono mode while offering up to 87% efficiency. The MAX9708 provides Class AB amplifier performance with the benefits of Class D efficiency, eliminating the need for a bulky heatsink and conserving power. The MAX9708 operates from a single +10V to +18V supply, driving the load in a BTL configuration.

The MAX9708 offers two modulation schemes: a fixedfrequency modulation (FFM) mode, and a spread-spectrum modulation (SSM) mode that reduces EMI-radiated emissions. The MAX9708 can be synchronized to an external clock from 600kHz to 1.2MHz. A synchronized output allows multiple units to be cascaded in the system.

Features include fully differential inputs, comprehensive click-and-pop suppression, and four selectable-gain settings (22dB, 25dB, 29.5dB, and 36dB). A pin-programmable thermal flag provides seven different thermal warning thresholds. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition.

The MAX9708 is available in 56-pin TQFN (8mm x 8mm x 0.8mm) and 64-pin TQFP (10mm x 10mm x 1.4mm) packages, and is specified over the extended -40°C to +85°C temperature range.

Key Features

Applications/Uses

	2 x 21W Output Power in Stereo Mode (8, THD = 10%)
	1 x 42W Output Power in Mono Mode (4, THD = 10%)
	High Efficiency: Up to 87%
	Filterless Class D Amplifier
	Unique Patented Spread-Spectrum Mode
	Programmable Gain (+22dB, +25dB, +29.5dB, +36dB)
	High PSRR (90dB at 1kHz)
	Differential Inputs Suppress Common-Mode Noise
	Shutdown and Mute Control
	Integrated Click-and-Pop Suppression
	Low 0.1% THD+N
	Current Limit and Thermal Protection
	Programmable Thermal Flag
	SYNC Input/Output
	Available in Thermally Efficient, Space-Saving Packages: 56-Pin TQFN and 64-Pin TQFP

	Automotive
	LCD TVs
	PC/HiFi Audio Solutions
	PDP TVs

Key Specifications: Speaker Amplifiers

Part Number

Class

Speaker Amp. V_CC (min) (V)

Speaker Amp. V_CC (max) (V)

Speaker Amp. I_CC (typ) (mA)

P_OUT into 4Ω @ 1% THD+N (W)

P_OUT into 4Ω @ 10% THD+N (W)

P_OUT into 8Ω @ 1% THD+N (W)

P_OUT into 8Ω @ 10% THD+N (W)

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

SNR, A-weighted (dB)

PSRR (db)

Speaker Amp. External Gain

Speaker Amp. Fixed Gain (min) (V/V)

Speaker Amp. Fixed Gain (max) (V/V)

Features

Number of Channels

Price^**

MAX9708

0.15

12.6

•	External Clock Synchronization

•	Programmable Thermal Flag

$2.98 @ 1k

See All Speaker Amplifiers (30)

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.

Diagram

Simplified Block Diagram: Stereo Mode

MAX9708: Simplified Block Diagram

Simplified Block Diagram: Mono Mode