AKM AK4213音频D类扬声器放大方案

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AKM AK4213音频D类扬声器放大方案

作者：时间：2009-03-24 10:57 来源：eaw

AKM 公司的AK4213是音频单声道D类扬声器放大器，带有立体声无电容耳机放大器。AK4213具有模拟音频混合电路，使得带手机和手提A/V播放器设计中容易接口。输入电路支持单端和差分模式。扬声器放大器包括自动音量控制（ALC）电路，8欧姆负载输出功率达1.6W。AK4213的模拟输入电平从+10dB到-20dB，每次变化2dB。微控制器接口为I2C总线。AK4213的THD+N为-65dB，输出噪音电平为85uV。本文介绍了AK4213的主要特性，方框图，典型连接框图以及AK4213 评估板方框图和详细电路图。

The AK4213 is an audio mono class-D speaker amplifier with stereo cap-less headphone amplifier. The AK4213 features analog mixing circuit that allow easy interfacing in mobile phone and portable A/V player designs. The input circuit supports both of single-ended and differential modes, and headphone supports stereo and mono modes. The speaker amplifier includes ALC (Automatic Level Control) circuit which is able to stabilize each output sound levels. The AK4213 is available in CSP package (3.0mm x 3.0mm),
utilizing less board space than competitive offerings.
主要特性：
Single-ended / Differential Input
Analog Mixing Circuit
Analog Input Volume: +10dB to –20dB, 2dB step
μP Interface: I2C Bus (Ver1.0, 400 kHz Fast-Mode)
Thermal Shutdown / Short Protection circuit
Mono Class-D Speaker Amplifier:
BTL output
Output Power: 1.6W @ 8Ω, SVDD=5V 0.8W @ 8Ω, SVDD=3.6V
THD+N: -65dB @ 8Ω, Po = 0.25W, SVDD=3.6V
Output Noise Level: 85μVrms
ALC (Automatic Level Control) Circuit
Bypass Mode
Pop Noise Free at Power-ON/OFF and Mute
External filter-less
Stereo Cap-less Headphone Amplifier:
Mono / Stereo Mode
Output Power: 64mW x 2ch @ 16Ω, SVDD=3.3V, THD+N=-40dB
THD+N: -58dB @ 16Ω, Po=30mW, SVDD=3.3V
Output Noise Level: 24μVrms
Output Volume: +12dB to –50dB, 2dB Step
Pop Noise Free at Power-ON/OFF and Mute
Power Supply:
Analog: 2.6V ∼ 3.6V
Headphone Amplifier: 2.6V ∼ 3.6V
Speaker Amplifier: 3.0V ∼ 5.5V
Digital Interface: 1.6V ∼ 3.6V
Ta: −40 ∼ 85°C
Package: 29pin CSP (3.0mm x 3.0mm, 0.5mm pitch)

图1。AK4213方框图

图2。AK4213 典型连接框图

AK4213 评估板Rev.1 AKD4213-B
AKD4213-B is an evaluation board for the AK4213, mono class-D speaker amplifier with stereo cap-less Headphone Amplifier. The AKD4213-B can easily be evaluated for mixing circuit, Headphone amplifier and Speaker amplifier. The AKD4213-B can also be controlled via the serial control interface.