MAX9722B
5V, Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown
Next-Generation DirectDrive Headphone Amplifiers Offer Differential Inputs and 5V Operation
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Overview
Features and Benefits
- 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
Product Details
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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Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MAX9722BETE+ | Material Declaration | Reliability Data | Thin Quad Flatpack, No Leads | |
| MAX9722BETE+T | Material Declaration | Reliability Data | Thin Quad Flatpack, No Leads | |
| MAX9722BEUE+ | Material Declaration | Reliability Data | 16-TSSOP_4.4-4.4_MM | |
| MAX9722BEUE+T | Material Declaration | Reliability Data | 16-TSSOP_4.4-4.4_MM | |
| Wafer Fabrication Data |
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