Industry's First Class D Amplifier to Enable Direct Battery Operation and Dual-Mode (Analog/Digital) Volume Control
Note to Editor:
- The MAX9768 is a highly efficient, mono, 10W Class D speaker amplifier with versatile, analog/digital volume control.
- This amplifier enables direct battery operation in portable applications.
- The MAX9768's wide, 4.5V to 14V supply-voltage range enables this direct battery operation.
- The MAX9768 is ideal for TVs, conference phones, PCs, docking stations, or any other application requiring battery operation, high-efficiency amplification, and volume control
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SUNNYVALE, CA—November 5, 2007—Maxim Integrated Products (Pink Sheets: MXIM) introduces the MAX9768 highly efficient, 10W, mono, single-supply, Class D speaker amplifier with versatile, analog/digital volume control. Class D architecture enables this device to operate over a wide, 4.5V to 14V supply-voltage range. This wide voltage range allows direct battery operation in portable applications, thus eliminating the need for a DC-DC converter between the battery and speaker amplifier. Additionally, the amplifier's high 87% efficiency eliminates the need for heatsinking. To further reduce BOM cost, the MAX9768 utilizes Maxim's patented,* filterless, spread-spectrum modulation technique, which minimizes EMI-radiated emissions and eliminates the need for the bulky, costly inductor-capacitor filters typically required to achieve acceptable EMI performance. The MAX9768 significantly reduces overall solution size and cost, thus making it ideal for battery-operated equipment, TVs, PCs, GPS, and personal/security radios.
The MAX9768 is the industry's first Class D amplifier to integrate flexible, dual-mode volume control, which enables either analog or digital control of a 64-step volume-control circuit. Analog control can be achieved using a DC voltage, potentiometer, filtered microcontroller PWM signal, or other analog signal. Digital control is possible using the on-board I²C-compatible interface.
The MAX9768 delivers up to 10W of output power into an 8Ω speaker with a 14V supply, and features high 77dB PSRR, low 0.08% THD+N, and SNR up to 97dB. Additionally, it provides robust short-circuit and thermal-overload protection, comprehensive click-and-pop suppression, and a low-power shutdown mode. Fully specified over the -40°C to +85°C extended temperature range, the MAX9768 is available in a small, 4mm x 4mm, 28-pin TQFN package. Prices start at $1.20 (1000-up, FOB USA).
*U.S. Patent #6,847,257
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