AUD4990 Datasheet | Analog Express

AUD4990 2W Audio Power Amplifier with Selectable Shutdown October 2008 AUD4990 2W Audio Power Amplifier with Selectable Shutdown General Description The AUD4990 is an audio power amplifier for mobile phone and other portable electronic device applications. It can deliver 1.3 watts of continuous average power to an 8 ohm BTL (bridge tied load) and 2 watts of continuous average power to a 4 ohm BTL, with less than 1% distortion from a 5V DC power supply. The AUD4990 is specifically designed to provide high output power with a minimal amount of external ponents. It requires no output coupling capacitors, for instance. Because of its space-saving footprint, it perfectly meets the needs of mobile phones, PDAs, notebook puters and other low-voltage applications that require small power sources in a small package. The AUD4990 can offer a low standby current and a zero shutdown current. Furthermore, the amplifier’s startup time is fast enough to use its shutdown mode as a mute function. The AUD4990 Features circuitry that eliminates pop-and-click noise whenever the device is turned on or off. Key Specifications Wide Power Supply Voltage Range Typical THD at 1W, 8Ω High PSRR Low Quiescent Current 2.7V < VDD < 5.5 0.2% (typ) 68 d B (typ) 2.5 m A (typ) Features Space Saving Thermal Package Active High or Low Shutdown Mode External Gain Configuration Stable Unity Gain Can Drive CL up to 200p F Applications Mobile Phones PDAs Notebook puters Portable Electronic Devices Typical Application .. VDD RF 20k Ω Audio Input Ci 0.39 µ F Ri 20kΩ + CS 1.0 µF - IN + IN _ + 20kΩ 20kΩ _ BIAS VO1 - RL 8Ω VO2 + THD + N (%) Bypass + CB 1.0µF V DD/2 + Shutdown Shutdown Mode GND GND V DD V DD 0 1 0 1 Control Status Shutdown On On Shutdown Shut Down SD Mode Shut...