GENERAL DESCRIPTION

The AD1991 is a 2-channel BTL or 4-channel single-ended class D audio power output stage. The part is configured during reset to be in either 2-channel mode or 4-channel mode.

FEATURES

Class D/1-Bit Audio Power Output Stage

5 V Analog and Digital Supply Voltages

Power Stage Power Supply 8 V to 20 V

Output Power @ 0.1 THD + N

Stereo Mode

2 x 20 W @ 4 Ω @ 14.4 V

2 x 20 W @ 8 Ω @ 20 V

Mono Mode

1 x 40 W @ 4 Ω @ 20 V

RON < 320 mΩ (per Transistor)

Efficiency > 85 @ Full Power/8 Ω

Clickless Mute Function

Turn-On and Turn-Off Pop Suppression

Short-Circuit Protection

Overtemperature Protection

Data Loss Protection

2-Channel BTL Outputs or

4-Channel Single-Ended Outputs

52-Lead Exposed Pad TQFP Package

Low Cost DMOS Process

APPLICATIONS

PC Audio Systems

Minicomponents

Automotive Amplifiers

Home Theater Systems

Televisions