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| PCM186x 110dB立体声音频模数转换(ADC)解决方案 |
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| 文章来源： 更新时间：2014/5/4 13:24:00 |
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TI公司的PCM186x系列是音频前端器件,集成了许多系统级功能,可以替代某些DSP功能,采用新的方法集成音频功能,很容易和欧洲Ecodesign兼容,并开发出具有高性能终端产品和降低成本,通用的模拟麦克风输入,8个带MUX和PGA的模拟输入,4x数字麦克风输入,硬件可编程增益放大器和软件可编程增益放大器,主要用在家庭影院和TV,汽车音响,蓝牙扬声器以及麦克风阵列处理器.本文介绍了PCM186x系列主要特性和框图,系统配置框图和评估模块PCM186xEVM (EVM)特性,电路图,材料清单和PCB元件布局图.
The PCM186x family of audio front-end devices takes a new approach to audio-function integration to ease compliance with European Ecodesign legislation while enabling high-performance end products at reduced cost. With no need for a 5-volt supply or an external programmable-gain amplifier, smaller, smarter products are feasible at reduced cost.
The PCM186x highly flexible audio front end supports input levels from small-mV microphone inputs all the way to 2.1VRMS line Inputs without external resistor dividers. The PCM186x family integrates many system-level functions that assist or even replace some DSP functions.
All these features are available using a single 3.3V power supply. An integrated bandgap voltage reference provides excellent PSRR, so that a dedicated analog 3.3V rail may not be required.
PCM186x系列主要特性:
Universal Analog Mic Input, 2.1VRMS Full Scale
8 Analog Inputs with MUX and PGA
Analog pre-mix function before PGA/MUX
Single Ended, Pseudo-Differential or Differential Inputs with Mic Bias
4x Digital Microphone Inputs
Up to 4 Mono ADC channels (PCM1865)
Hardware Control (PCM1861)
I2C or SPI Control (PCM1863/5)
H/W Programmable Gain Amplifier
Fixed Mic Pregain select : 20, 32dB (Analog)
S/W Programmable Gain Amplifier
Integrated High Performance Audio PLL
Single 3.3V Supply for Analog and Digital
Additional 1.8V Core and Interface for lower power consumption
Power Dissipation at 3.3V: <85mW (PCM1861/3), <145mW (PCM1865)
’Energysense’ Audio Content Detector - for auto system wakeup and sleep
Master or Slave Audio Interface:
Mixer functionality:
Digital Mixer to mix ADC outputs and I2S synchronous inputs
Zero Crossing PGA Gain changes
Auto PGA Clipping Suppression Control
PCM186x系列主要应用:
• Home Theater and TV
• Automotive Head Units
• Bluetooth® Speaker
• Microphone Array Processors
图1. PCM186x系列内部框图
图2. PCM186x系列简化框图
图3. PCM186x系列系统配置框图
评估模块PCM186xEVM (EVM)
The PCM186xEVM (EVM) is an easy-to-use evaluation board for the PCM186x family of ADCs. Due to the pin-for-pin nature of the PCM186x family, any of the following part numbers can be used with this board; PCM1861, PCM1863, and PCM1865.
The PCM186xEVM (EVM) is an easy-to-use evaluation board for the PCM186x family of ADCs. Due to the pin-for-pin nature of the PCM186x family, any of the following part numbers can be used with this board; PCM1861, PCM1863, and PCM1865.
图4. 评估模块PCM186xEVM和USB-I2X板连接图
图5. 评估模块PCM186xEVM和USB-I2X板框图
图6. 评估模块PCM186xEVM电路图
图7. 评估模块PCM186xEVM电路图:SPDIF I/O和控制板I/O
评估模块PCM186xEVM材料清单:
图8. 评估模块PCM186xEVM PCB元件布局图
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