Описание
The MAX9722A stereo headphone amplifiers are designed for portable equipment where board space is at a premium. The MAX9722A use a unique 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 component height. Additionally, the gain of the amplifier is set internally (adjusted externally (MAX9722A). The MAX9722A deliver up to 70mW per channel into a 16O load or 130mW into a 32O load and have low 0.009% THD+N. An 80dB at 217Hz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. The MAX9722A include ±8kV ESD protection on the headphone outputs. Comprehensive anticlick-and-pop circuitry suppresses audible clicks and pops on startup and shutdown. A low-power shut down mode reduces the supply current to 0.1µA. The MAX9722A operate from a single 2.4V to 5.5V supply, consume only 5.5mA 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 x 3mm x 0.8mm) and 16-pin TSSOP packages.
- 2.4V to 5.5V Single-Supply Operation
- High PSRR (80dB at 217Hz) Eliminates LDO
- No Bulky DC-Blocking Capacitors Required
- Ground-Referenced Outputs Eliminate DC Bias Voltage on Headphone Ground Pin
- No Degradation of Low-Frequency Response Due to Output Capacitors
- Differential Inputs for Enhanced Noise Cancellation
- Adjustable Gain (MAX9722A)
- 130mW per Channel into 32O
- Low 0.009% THD+N
- Integrated Click-and-Pop Suppression
- Low Quiescent Current (5.5mA)
- Short-Circuit and Thermal-Overload Protection
- ±8kV ESD-Protected Amplifier Outputs (Human Body Model)
- Available in a Space-Saving 16-Pin Thin QFN (3mm x 3mm x 0.8mm) Package
