AS1701 and AS1706 amplifiers are ideal for mobile phones, PDAs and other portable devices


RALEIGH, N.C. (December 6th, 2005) – austriamicrosystems has introduced its new AS1701/06 family of single-channel audio amplifiers delivering 1.6W output power. The amplifiers offer higher output power (1.6W) at comparable distortion levels, or lower distortion levels at comparable output power than similar products. This makes the AS1701 and AS1706 ideal for audio front-ends for battery powered audio devices, such as MP3, CD and DVD players, mobile phones, PDAs, portable speakers and other handheld battery-powered devices.

The AS1701/06 family contains a bridge-tied load (BTL) output stage to differentially drive 4 Ohm and 8 Ohm speakers. The amplifiers offer extremely low distortion with 0.05% THD+N at 1W output power into an 8 Ohm load. At THD+N of 1% they deliver 1.6W output power into a 4 Ohm load or 1.2W into an 8 Ohm load. Due to the wide input supply range of 2.7-5.5V the amplifiers can be used for 3V systems as well delivering 600mW continuous output power into 4 Ohm. With a low power-supply rejection ratio (PSRR) the AS1701/06 can be used without a linear regulator even with a noisy digital supply. Gain levels can be adjusted via external components offering utmost flexibility for system design.

Continuing austriamicrosystems’ industry leadership in low power consumption, the integrated shutdown circuitry disables the bias generator and amplifiers, and reduces quiescent current consumption to less than 10nA. The power down mode can be entered via digital control signal.
Sophisticated click-and-pop suppression circuitry reduces audible clicks and pops during power-up and shutdown.

The devices are available in 8-pin MSOP package and are pin-compatible with National’s LM4890 and Maxim’s MAX9716.


* 1.6W Output Power * 2.7V to 5.5V (VDD) Single-Supply Operation * 65dB PSRR @ 217Hz * THD+N: 1.6W into 4Ohm at 1% * No Output Coupling Capacitors Required * External Gain Configuration Capability * 10nA Low-Power Shutdown Mode (AS1701 Active-High, AS1706 Active-Low) * Click and Pop Suppression * Pin-Compatible with National Semiconductor LM4891 and Maxim MAX9716 * Over-Temperature and Over-Current Protection * Operating Temperature Range: -40°C to +85°C * 8-pin MSOP Package
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