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| PCM186x 110dB立體聲音頻模數(shù)轉(zhuǎn)換(ADC)解決方案 |
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| 文章來源： 更新時間：2014/5/4 13:24:00 |
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TI公司的PCM186x系列是音頻前端器件,集成了許多系統(tǒng)級功能,可以替代某些DSP功能,采用新的方法集成音頻功能,很容易和歐洲Ecodesign兼容,并開發(fā)出具有高性能終端產(chǎn)品和降低成本,通用的模擬麥克風輸入,8個帶MUX和PGA的模擬輸入,4x數(shù)字麥克風輸入,硬件可編程增益放大器和軟件可編程增益放大器,主要用在家庭影院和TV,汽車音響,藍牙揚聲器以及麥克風陣列處理器.本文介紹了PCM186x系列主要特性和框圖,系統(tǒng)配置框圖和評估模塊PCM186xEVM (EVM)特性,電路圖,材料清單和PCB元件布局圖.
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系列主要應用:
• Home Theater and TV
• Automotive Head Units
• Bluetooth® Speaker
• Microphone Array Processors
圖1. PCM186x系列內(nèi)部框圖
圖2. PCM186x系列簡化框圖
圖3. PCM186x系列系統(tǒng)配置框圖
評估模塊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.
圖4. 評估模塊PCM186xEVM和USB-I2X板連接圖
圖5. 評估模塊PCM186xEVM和USB-I2X板框圖
圖6. 評估模塊PCM186xEVM電路圖
圖7. 評估模塊PCM186xEVM電路圖:SPDIF I/O和控制板I/O
評估模塊PCM186xEVM材料清單:
圖8. 評估模塊PCM186xEVM PCB元件布局圖 |
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