MAX9722A Datasheet | Maxim Integrated

Description The MAX9722A/MAX9722B stereo headphone amplifiers are designed for portable equipment where board space is at a premium. The MAX9722A/MAX9722B use a unique, patented Direct Drive architecture to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, which saves cost, board space, and ponent height. Additionally, the gain of the amplifier is set internally (-2V/V, MAX9722B) or adjusted externally (MAX9722A). The MAX9722A/MAX9722B deliver up to 70m W per channel into a 16Ω load or 130m W into a 32Ω load and have low 0.009% THD+N. An 80d B at 217Hz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. The MAX9722A/MAX9722B include ±8k V ESD protection on the headphone outputs. prehensive anticlick-and-pop circuitry suppresses audible clicks and pops on startup and shutdown. A low-power shutdown mode reduces the supply current to 0.1µA. The MAX9722A/MAX9722B operate from a single 2.4V to 5.5V supply, consume only 5.5m A of supply current, feature short-circuit and thermal-overload protection, and are specified over the extended -40°C to +85°C temperature range. The devices are available in tiny 16-pin thin QFN (3mm ✕ 3mm ✕ 0.8mm) and 16-pin TSSOP packages. Features o 2.4V to 5.5V Single-Supply Operation o High PSRR (80d B at 217Hz) Eliminates LDO o No Bulky DC-Blocking Capacitors Required o Ground-Referenced Outputs Eliminate DC Bias Voltage on Headphone Ground Pin o No Degradation of Low-Frequency Response Due to Output Capacitors o Differential Inputs for Enhanced Noise Cancellation o Adjustable Gain (MAX9722A) or Fixed -2V/V Gain (MAX9722B) o 130m W per Channel into 32Ω o Low 0.009% THD+N o Integrated Click-and-Pop Suppression o Low Quiescent Current (5.5m A) o Short-Circuit and Thermal-Overload Protection o ±8k V ESD-Protected Amplifier Outputs (Human Body Model) o Available in a Space-Saving 16-Pin Thin QFN (3mm ✕ 3mm ✕...