Simplified Block Diagram
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- 750mW BTL Stereo Speaker Amplifier
- 65mW Stereo Headphone Amplifier
- 2.7V to 5.5V Single-Supply Operation
- Click-and-Pop Suppression
- Low 0.003% THD+N
- Low Quiescent Current: 13mA
- Low-Power Shutdown Mode: 5µA
- MUTE Function
- Headphone Sense Input
- Stereo 2:1 Input Multiplexer
- Optional 2-Wire, I²C-Compatible, or Parallel Interface
- Small 32-Pin Thin QFN (5mm x 5mm x 0.8mm) Package
- Cell Phones
- Digital Cameras
- Notebook Computers
- PDA Audio Systems
- Tablet PCs
These devices operate from a single 2.7V to 5.5V supply. A high 95dB PSRR allows these devices to operate from noisy supplies without additional power conditioning. An ultra-low 0.003% THD+N ensures clean, low distortion amplification of the audio signal. Click-and-pop suppression eliminates audible transients on power and shutdown cycles.
In speaker mode, the amplifiers can deliver up to 750mW of continuous average power into a 4Ω load. In headphone mode, the amplifier can deliver up to 65mW of continuous average power into a 16Ω load. The gain of the amplifiers is externally set, allowing maximum flexibility in optimizing output levels for a given load. The MAX9765/MAX9766 also feature a 2:1 input multiplexer, allowing multiple audio sources to be selected. The various functions are controlled by either an I²C-compatible (MAX9765/MAX9766) or simple parallel control interface (MAX9767).
All devices include two low-noise microphone preamps, a differential amp for internal microphones, and a single-ended amplifier for additional external microphones. A microphone bias output is provided, reducing external component count.
The MAX9765/MAX9766/MAX9767 are available in a thermally efficient 32-pin thin QFN package (5mm x 5mm x 0.8mm). All devices have short-circuit and thermal-overload protection (OVP) and are specified over the extended -40°C to +85°C temperature range.