AD1990: Class-D Audio Power Amplifier – 2 × 5W - Analog Devices - #1

Text version of the page

Audio Switching Amplifier AD1990 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. FEATURES Integrated stereo modulator and power stage <0.002% THD + N 101 dB dynamic range (A-weighted) 2 × 5 W output power (4 Ù, <0.01% THD + N) RDS-ON 65 dB On-off-mute pop noise suppression EMI optimized modulator Short-circuit protection Overtemperature protection Low cost DMOS process APPLICATIONS Advanced televisions Compact multimedia systems Minicomponents GENERAL DESCRIPTION The AD1990 is a 2-channel, bridge tied load (BTL), switching audio power amplifier with integrated Ó-Ä modulator. The modulator accepts a single-ended, analog input signal and converts it to a switching waveform to drive speakers directly. A digital, microprocessor-compatible interface provides control of reset, mute, and PGA gain, as well as feedback signals for thermal and overcurrent error conditions. The output stage can operate over a power supply voltages range of 8 V to 12 V. The analog modulator and digital logic operate from a 5 V supply. FUNCTIONAL BLOCK DIAGRAM B2B1A2A1OUTL+LEVELSHIFTERANDDEAD TIMECONTROLH-BRIDGEPGNDOUTL–OUTR+DCTRL2DCTRL1DCTRL0OUTR–D2D1C2C1NFR+NFR–NFL+NFL–MUTERESETERR2ERR1ERR0Ó-ÄMODULATORÓ-ÄMODULATORPGAPGAOSCILLATORVOLTAGEREFERENCEMODE CONTROLLOGIC ANDPOP/CLICKSUPPRESSIONAGNDCLKICLKOREF_FILTAINRAINLPVDDAVDDDVDDPGA1PGA0FEEDBACKNETWORKFEEDBACKNETWORKAD199005380-001 Figure 1.