Cirrus CS53L30多路麦克风音频应用解决方案

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Cirrus公司的CS53L30是高性能低功耗四模数转换器(ADC),0dB增益的动态范围91dB,THD+N为－84dB，四路全差分输入和模拟可编增益放大器,主要用于语音识别系统, 录音机,摄影机,数码相机以及高挡耳机和电话系统.本文介绍了CS53L30主要特性，框图,典型应用电路以及CS53L30评估板主要特性，框图.电路图和PCB元件布局图.

The CS53L30 is a high-performance, low-power, quad-channel ADC. It is designed for use in multiple-mic applications while consuming minimal board space and power.

The flexible ADC inputs can accommodate four channels of analog mic or line-input data in differential, pseudodifferential, or single-ended mode, or four channels of digital mic data. The analog input path includes a +10- to +20-dB boost and a –6- to +12-dB PGA. Digital mic data bypasses the analog gain circuits and is fed directly to the decimators.

Four mic bias generators are integrated into the device. The device also includes two digital mic serial clock outputs. The CS53L30 includes several digital signal processing features such as high-pass filters, noise gate, and volume control.

The device can output its four channels of audio data over two I2S ports or a single TDM port. Additionally, up to four CS53L30s can be used to output up to 16 channels of data over a single TDM line. This is done by setting the appropriate frame slots for each device, and each device then alternates between outputting data and setting the output pin to high impedance.

The CS53L30 can operate as a serial port clock master or slave. In Master Mode, clock dividers are used to generate the internal master clock and audio clocks from either the 6-/12-MHz, 6.144-/12.288-MHz, 5.6448-/11.2896-MHz, or 19.2-MHz master clock.

The device is powered from VA, a 1.8-V nominal supply and VP, a typical battery supply. An internal LDO on the VA supply powers the device’s digital core. The VP supply powers the mic bias generators and the AFE.

The CS53L30 is controlled by an I2C control port. A reset pin is also included. The device is available in a 30-ball 0.4-mm pitch WLCSP package and 32-pin 5 x 5-mm QFN package.

CS53L30主要特性:

Analog Input and ADC Features
 91-dB dynamic range (A-weighted) @ 0-dB gain
 –84-dB THD+N @ 0-dB gain
 Four fully differential inputs: Four analog mic/line inputs
 Four analog programmable gain amplifiers
 –6 to +12 dB, in 0.5-dB steps
 +10 or +20 dB boost for mic input
 Four mic bias generators
 MUTE pin for quick mic mute and programmable quick power down
Digital Processing Features
 Volume control, mute, programmable high-pass filter, noise gate
 Two digital mic (DMIC) interfaces
Digital Output Features
 Two DMIC SCLK generators
 Four-channel I2S output or TDM output. Four CS53L30s can be used to output 16 channels of 24-bit 16-kHz sample rate data on a single TDM line.
System Features
 Native (no PLL required) support for 6-/12-MHz, 6.144-/12.288-MHz, 5.6448-/11.2896-MHz, or 19.2-MHz master clock rates and 8- to 48-kHz audio sample rates
 Master or Slave Mode. Clock dividers can be used to generate common audio clocks from single-master clock input.
 Low power consumption
 Less than 4.5-mW stereo (16 kHz) analog mic record
 Less than 2.5-mW mono (8 kHz) analog mic record
 Selectable mic bias and digital interface logic voltages
 High-speed (400-kHz) I²C™ control port
 Available in 30-ball WLCSP and 32-pin QFN

CS53L30主要应用:

 Voice-recognition systems
 Advanced headsets and telephony systems
 Voice recorders
 Digital cameras and video cameras

图1. CS53L30方框图

图2. CS53L30典型应用电路图:模拟麦克风连接

图3. CS53L30典型应用电路图:数字麦克风连接

图4.双CS53L30八个麦克风阵列电路图

CS53L30评估板

The CDB53L30 board is a dedicated platform for testing and evaluating the CS53L30, a low-power, quad-channel microphone ADC with TDM output.

To allow comprehensive testing of CS53L30 features and performance, extensive software-configurable options are available on the CDB53L30.

Software options, such as register settings for the CS53L30, are configured with the FlexGUI software, which communicates with the CDB53L30 via USB from a Windows®-compatible computer. In addition, digital I/O headers on the CDB53L30 allow external control signals (from a host processor, for example) to configure and interface with the CS53L30 directly without the use of FlexGUI.

The CDB53L30 also serves as the component and layout reference for the CS53L30.

CS53L30评估板主要特性:

• Analog or digital Inputs
— Analog microphone or line inputs via TRS 1/8” jacks
— Digital microphone inputs via stake headers
• Two CS53L30 devices support up to eight channels of phase-aligned audio
• Onboard master clock generator
• S/PDIF transmitter interface via RCA and optical jacks
• External digital I/O via stake headers
— Serial audio port I/O
— Control signal I/O
— External I²C™ control port I/O
• Flexible power-supply configuration
— USB or external power supply
• FlexGUI software control
— Windows® compatible
— Predefined and user-configurable scripts

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