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