MAX9722
5V, Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown
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Next-Generation DirectDrive Headphone Amplifiers Offer Differential Inputs and 5V Operation
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Features
- 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) or Fixed -2V/V Gain (MAX9722B)
- 130mW per Channel into 32Ω
- 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
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The MAX9722A/MAX9722B stereo headphone amplifiers are designed for portable equipment where board space is at a premium. The MAX9722A/MAX9722B use a unique DirectDrive® 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 (-2V/V, MAX9722B) or adjusted externally (MAX9722A). The MAX9722A/MAX9722B deliver up to 70mW per channel into a 16Ω load or 130mW into a 32Ω 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/MAX9722B 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 shutdown mode reduces the supply current to 0.1µA.
The MAX9722A/MAX9722B operate from a single 2.4V to 5.5V supply, consume only 5.5mA 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.
Applications
- Cell Phones
- Flat-Panel Monitors
- MP3 Players
- Notebook and Desktop PCs
- PDAs
- Portable Audio Equipment
- Smartphones
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MAX9722
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Data Sheet
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MAX9722-MAX9722B: 5V, Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown Data Sheet (Rev.2)
MAX9722-MAX9722B_cn: 5V、差分输入、DirectDrive、130mW立体声耳机放大器，带有关断 Data Sheet (Rev.2)
Reliability Data
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