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a u s t ri a m i c r o s y s t e m s
AS1701, AS1706
1.6W Audio Power Amplifiers
P ro du c t B ri e f
1 General Description
The AS1701 and AS1706 are 1.6W bridged audio power amplifiers that provide excellent circuit reliability, providing a very low-cost solution by eliminating external components when used with 2.7 to 5.5V-powered circuits. The devices have superb total harmonic distortion (THD) at high-power output and excellent power supply rejection with 4- and 8-loads. Integrated over-temperature and over-current protection circuitry switch the devices off in case of an output short-circuit. A digital input allows the devices to automatically switch into shutdown mode. Click- and popsuppression circuitry reduces audible clicks and pops during power-up and shutdown. The gain (AV) of the devices is controlled using external resistors. The AS1701/AS1706 are available in an 8-pin MSOP package.
2 Key Features
! ! ! ! ! ! ! ! ! !
2.7 to 5.5V (VCC) Single-Supply Operation Very High PSRR: Greater Than 65dB @ 217Hz THD+Noise: 1.6W into 4 at 1% No Output Coupling Capacitors Required External Gain Configuration Capability Low-Power Shutdown Mode: 10nA Click and Pop Suppression Over-Temperature and Over-Current Protection Operating Temperature Range: -40 to +85C 8-pin MSOP Package
3 Applications
The AS1701/AS1706 are ideal as audio front-ends for battery powered audio devices such as MP3 and CD players, mobile phones, PDAs, portable DVD players, and any other hand-held battery-powered device.
Figure 1. Typical Configuration Block Diagram
VDD 10F 20k RF
+
CS 6 VDD
Audio Input
CIN 0.33F
RIN 20k
4 IN3 IN+
- + 50k 40k
5 OUT+ 40k RL = 4 or 8 8 OUT-
2 0.1 to + 1F CB BIAS 1 SHDN
- VDD/2 + Av = -1 Bias 50k
AS1701/ AS1706
7
GND
(c) 1997-2005, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 1.11
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AS1701, AS1706 Product Bri ef
austriam i c r o systems
Copyrights
Copyright (c) 1997-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters austriamicrosystems AG A-8141 Schloss Premstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 e-mail: info@austriamicrosystems.com For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com
austriamicrosystems
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(c) 1997-2005, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 1.11

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