AD1991 Datasheet | Analog Devices

Class D/1-Bit Audio Power Output Stage AD1991 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 ؋ 20 W @ 4 ⍀ @ 14.4 V 2 ؋ 20 W @ 8 ⍀ @ 20 V Mono Mode 1 ؋ 40 W @ 4 ⍀ @ 20 V RON < 320 m⍀ (per Transistor) Efficiency > 85% @ Full Power/8 ⍀ 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 Miniponents Automotive Amplifiers Home Theater Systems Televisions GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAMS 2-Channel Mode AVDD DVDD PVDD 6 OUTA INA LEFT INPUT A1 A2 3 B1 B2 LEVEL SHIFTER AND SWITCH CONTROL H-BRIDGE OUTB 3 OUTC INC RIGHT INPUT C1 C2 D1 OUTD D2 3 CURRENT OVERLOAD THERMAL SHUTDOWN THERMAL WARNING DATA LOSS 14 PGND CLK RST/PDN MUTE ،n THERMAL PROTECTION SHORT-CIRCUIT PROTECTION MUTE CONTROL 4 AGND DGND 2 TEST CONTROL 4-Channel Mode AVDD DVDD PVDD 6 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. To protect the IC as well as the connected speakers, the AD1991 provides turn-on and turn-off pop suppression, short-circuit protection, and overtemperature shutdown. To control the IC, a power-down/reset input and a mute pin are available. The output stage can be operated over a power supply range from 8 V to 20 V. In 2-channel mode, Transistors A1, B2, C1, and D2 are turned on by a Logic 1 on inputs INA and INC, and Transistors A2, B1, C2, and D1 are turned on by a Logic 0 on inputs INA and INC. In 4-channel mode, Transistors A1, B1, C1, and D1 are turned on by a Logic 1 on the four inputs, and Transistors A2, B2, C2, and D2 are turned on by a Logic 0 on the four inputs (see the...