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| AK4637 低功耗24位音频CODEC解决方案 |
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| 文章来源： 更新时间：2015/11/17 13:28:00 |
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AKM公司的AK4637是集成了麦克风和扬声器放大器的低功耗24位单声道音频编解码器(CODEC),取样频率从表面上8kHz到48kHz,输入电路包括麦克风放大器和高性能数字自动电平控制电路(ALC),输出电路包括功率1W的扬声器放大器,主要用在音频窄带,宽带和超宽带声音信号处理.本文介绍了AK4637主要特性,功能框图以及评估板AKD4637-B功能,框图,电路图,PCB元件布局图和设计图.
The AK4637 is a low power 24-bit Mono CODEC with a microphone and speaker amplifiers. The AK4637 supports sampling frequency from 8kHz to 48kHz. It is suitable for a wide range of application from speech signal processing for narrowband, wideband and super wideband to sound signal processing for audio band.
The input circuits include a microphone amplifier and a high performance digital ALC (automatic level control) circuit. In addition, the output circuits include a speaker amplifier with 1W output power. It is suitable for various products as well as portable applications with recording/playback function.
The AK4637 are available in a small 20-pin QFN (3mm x 3mm, 0.4mm pitch: AK4637EN) package saving mounting area on the board.
AK4637主要特性:
1. Recording Functions
Analog Input
Monaural Single-ended input or Differential input
Microphone Amplifier: +30dB ~ 0dB, 3dB Step
Microphone Power Supply: 2.0V or 2.4V, Noise Level= 108dBV
Digital ALC (Automatic Level Control)
- Setting Range: +36dB 52.5dB, 0.375dB Step & Mute
ADC Performance: S/(N+D): 83dB, DR, S/N: 88dB (MIC-Amp=+18dB)
S/(N+D): 84dB, DR, S/N: 95dB (MIC-Amp=0dB)
Wind Noise Reduction Filter
5-Band Notch Filter: Include Dynamic Gain Control
Digital Microphone Interface
2. Playback Functions
Digital ALC (Automatic Level Control)
- Setting Range: +36dB ~ 52.5dB, 0.375dB Step & Mute
Sidetone Mixer & Volume Control (0dB ~ 18dB, 6dB Step)
Digital Volume Control
- +12dB ~ 89.5dB, 0.5dB Step & Mute
Mono Speaker Amplifier (with Line Output Switch)
- Speaker Amplifier Porformance: S/(N+D): 75dB@250mW, S/N: 97 dB
- BTL Output
- Output Power: 400mW@8 (AVDD=3.3V), 1W@8 (AVDD=5V)
Analog Mixing: BEEP Input
3. Power Management
4. Master Clock:
(1) PLL Mode
Frequencies: 11.2896MHz, 12MHz, 12.288MHz, 13.5MHz, 24MHz, 27MHz
(MCKI pin), 16fs, 32fs, 64fs (BICK pin)
(2) External Clock Mode
Frequencies: 256fs, 384fs, 512fs or 1024fs (MCKI pin)
5. Sampling Frequencies
PLL Master Mode:
8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz
PLL Slave Mode (BICK pin): 8kHz ~ 48kHz
EXT Master/Slave Mode:
8kHz ~ 48kHz (256fs, 384fs, 512fs), 8kHz 24kHz (1024fs)
6. Master/Slave Mode
7. Audio Interface Format: MSB First, 2’s complement
ADC: DSP Mode, 16/24bit MSB justified, 16/24bit I2S
DAC: DSP Mode, 16/24bit MSB justified, 16bit LSB justified, 16/24bit I2S
8. P I/F: I2C Bus (Ver 1.0, 400kHz Fast-Mode)
9. Operating Temperature: Ta = 40 85C
10. Power Supply
Analog Power Supply (AVDD): 2.8 ~ 5.5V
Digital Power Supply (DVDD): 1.6 ~ 1.98V
Digital I/O Power Supply (TVDD): 1.6 or (DVDD – 0.2) ~ 3.6V
11. Package:
20-pin QFN (3 x 3 mm, 0.4mm pitch)
AK4637应用:
IP Camera
Digital Camera
MFP(Multi- Function Printer)
图1.AK4637功能框图
评估板AKD4637-B
The AKD4637-B is an evaluation board for the AK4637 24bit CODEC with built-in PLL and MIC/SPK Amplifier.
The AKD4637-B has the interface with AKM’s A/D evaluation boards. Therefore, it’s easy to evaluate theAK4637. The AKD4637-B also has the digital audio interface and can achieve the interface with digital audiosystems via opt-connector.
评估板AKD4637-B功能:
Compatible with 2 types of interface
- Direct interface with AKM’s A/D converter evaluation boards
- DIT/DIR with optical input/output
USB port for board control
图2.评估板AKD4637-B框图
图3.评估板AKD4637-B电路图
图4.评估板AKD4637-B PCB元件布局图(A面)
图5.评估板AKD4637-B PCB元件布局图(B面)
图6.评估板AKD4637-B PCB设计图(A面)
图7.评估板AKD4637-B PCB设计图(B面)
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