基于MAX97001設計的單片音頻系統(tǒng)方案

作者：時間：2010-05-28 來源：網(wǎng)絡

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MAX97001是單聲道音頻子系統(tǒng),包括單聲道揚聲器放大器,立體聲耳機放大器和模擬DPST開關. 揚聲器和立體聲耳機放大器是單獨音量控制,4個輸入可配置成兩個差分輸入或4個單端輸入.2.7V-5.5V揚聲器電源,輸出700mW,1.6V-2V耳機電源,每路輸出37mW.主要用在手機和PMP.本文介紹MAX97001主要特性, 功能方框圖與應用框圖,MAX97001評估板主要特性,電路圖和材料清單(BOM).

The MAX97001 mono audio subsystem combines a mono speaker amplifier with a stereo headphone amplifier and an analog DPST switch. The headphone and speaker amplifiers have independent volume control and on/off control. The 4 inputs are configurable as 2 differential inputs or 4 single-ended inputs.

The entire subsystem is designed for maximum efficiency. The high-efficiency, 700mW, Class D speaker amplifier operates directly from the battery and consumes no more than 1µA in shutdown mode. The Class H headphone amplifier utilizes a dual-mode charge pump to maximize efficiency while outputting a ground-referenced signal that does not require output coupling capacitors.

The speaker amplifier incorporates a distortion limiter to automatically reduce the volume level when excessive clipping occurs. This allows high gain for low-level signals without compromising the quality of large signals.

All control is performed using the 2-wire I²C interface. The MAX97001 operates over the extended -40℃ to +85℃ temperature range, and is available in the 2mm x 2.5mm, 20-bump, WLP package (0.5mm pitch).

MAX97001主辦要特性:

2.7V to 5.5V Speaker Supply Voltage

1.6V to 2V Headphone Supply Voltage

700mW Speaker Output (V_PVDD = 3.7V, Z_SPK = 8Ω + 68µH)

37mW/Channel Headphone Output (R_HP = 16Ω)

Low-Emission Class D Amplifier

Efficient Class H Headphone Amplifier

Ground-Referenced Headphone Outputs

2 Stereo Single-Ended/Mono Differential Inputs

Integrated Distortion Limiter (Speaker Outputs)

Integrated DPST Analog Switch

No Clicks and Pops

TDMA Noise Free

2mm x 2.5mm, 20-Bump, 0.5mm Pitch WLP Package

MAX97001應用:

Cell Phones

Portable Multimedia Players