基于CS8422的24位多格式立體聲數(shù)字音頻接收技術(shù)
24-bit, 192-kHz, Asynchronous Sample Rate Converter with Integrated Digital Audio Interface Receive
r The CS8422 is a 24-bit, high-performance, monolithic CMOS stereo asynchronous sample rate converter with an integrated digital audio interface receiver that decodes audio data according to the EIAJ CP1201, IEC-60958, AES3, and S/PDIF interface standards.
Audio data is input through the digital interface receiver or a 3-wire serial audio input port. Audio is output through one of two 3-wire serial audio output ports. Serial audio data outputs can be set to 24, 20, 18, or 16-bit word-lengths. Data into the digital interface receiver and serial audio input port can be up to 24-bits long. Input and output data can be completely asynchronous, synchronous to an external clock through XTI, or synchronous to the recovered master clock.
The CS8422 can be controlled through the control port in Software Mode or in a Stand-Alone Hardware Mode. In Software Mode, the user can control the device through an SPI or I²C control port.
Target applications include digital recording systems (DVD-R/RW, CD-R/RW, PVR, DAT, MD, and VTR), digital mixing consoles, high-quality D/A, effects processors, computer audio systems, and automotive audio systems.
The CS8422 is available in a space-saving QFN package in both Commercial (-40℃ to +85℃) and Automotive (-40℃ to +105℃) grades. The CDB4822 is also available for device evaluation and implementation suggestions.
CS8422主要特性:
Sample Rate Converter Features
140 dB Dynamic Range
-120 dB THD+N
No External Master Clock Required
Supports Sample Rates up to 211 kHz
Input/Output Sample Rate Ratios from 6:1 to 1:6
Master Mode Master Clock/Sample Rate Ratio Support: 64, 96, 128, 192, 256, 384, 512, 768, 1024
16, 18, 20, or 24-bit Data I/O
Dither Automatically Applied and Scaled to Output Resolution
Multiple Device Outputs are Phase Matched
Digital Audio Interface Receiver Features
Complete EIAJ CP1201, IEC-60958, AES3, S/PDIF Compatible Receiver
28 kHz to 216 kHz Sample Rate Range
2:1 Differential AES3 or 4:1 S/PDIF Input Mux
De-emphasis Filtering for 32 kHz, 44.1 kHz, and 48 kHz
Recovered Master Clock Output: 64 x Fs, 96 x Fs, 128 x Fs, 192 x Fs, 256 x Fs,384 x Fs, 512 x Fs, 768 x Fs, 1024 x Fs
49.152 MHz Maximum Recovered Master Clock Frequency
Ultralow-jitter Clock Recovery
High Input Jitter Tolerance
No External PLL Filter Components Required
Selectable and Automatic Clock Switching
AES3 Direct Output and AES3 TX Passthrough
On-chip Channel Status Data Buffering
Automatic Detection of Compressed Audio Streams
Decodes CD Q Sub-Code
System Features
SPI™ or I²C™ Software Mode and Stand-Alone Hardware Mode
Flexible 3-wire Digital Serial Audio Input Port
Dual Serial Audio Output Ports with Independently Selectable Data Paths
Master or Slave Mode Operation for all Serial Audio Ports
Time Division Multiplexing (TDM) Mode
Integrated Oscillator for use with External Crystal
Four General-purpose Output Pins (GPO)
+3.3 V Analog Supply (VA)
+1.8 V to 5.0 V Digital Interface (VL)
Space-saving 32-pin QFN Package
圖1. CS8422方框圖
圖2.CS8422軟件模式連接框圖
圖3.CS8422硬件模式連接框圖
圖4.CS8422硬件模式時鐘路徑圖
CS8422評估板CDB8422
Using the CDB8422 evaluation board is an ideal way to evaluate the CS8422. Use of the board requires a digital signal source, an analyzer, and a power supply. A Windows PC-compatible computer is also required if using software mode to configure the CDB8422.
S/PDIF and AES3/EBU input connections are made via RCA phono, optical, or XLR connectors to the CS8422. S/PDIF output connections are made via RCA phono or optical connectors from the CS8406 (S/PDIF Tx). System timing can be provided by a S/PDIF or AES3/EBU input signal, by the CS8422 with supplied master clock, or by an I/O stake header with a DSP connected.
The provided Windows-based software GUI makes configuring the CDB8422 easy. The software communicates through the PC’s USB port to configure the board so that all features of the CS8422 can be evaluated.
The board may also be configured without a PC connection by using hardware switches; however, not all configurations of the CDB8422 are possible in hardware mode.
CS8422評估板CDB8422主要特性:
IEC-60958, AES3/EBU, S/PDIF Inputs
– Single-Ended Inputs via Optical and RCA Input Jacks
– Differential Inputs via XLR Input Jack
S/PDIF Outputs
– Optical and RCA Output Jacks
– CS8406 Digital Audio Transmitter
I/O Stake Headers
– External Control Port Accessibility
– External Serial Audio I/O Accessibility
3.3 V Logic Interface
Powered by Single External Power Supply or PC USB Port Connection
H/W Control via DIP Switches
FlexGUI S/W Control - Windows® Compatible
– Pre-Defined & User-Configurable Scripts
圖5.評估板CDB8422方框圖
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圖6.評估板CDB8422電路圖(1): CS8422 & XTI
圖7.評估板CDB8422電路圖(2): RF輸入
圖8.評估板CDB8422電路圖(3):PCM輸入插頭
圖9.評估板CDB8422電路圖(4): HW模式控制
圖9.評估板CDB8422電路圖(5):FPGA
圖10.評估板CDB8422電路圖(6): MCLK指向
圖11.評估板CDB8422電路圖(7): 串行音頻1輸出插頭[!--empirenews.page--]
圖12.評估板CDB8422電路圖(8): 串行音頻2輸出插頭
圖13.評估板CDB8422電路圖(9): TDM插頭
圖14.評估板CDB8422電路圖(10): CS8406和輔助TX
圖15.評估板CDB8422電路圖(11): USB和MCU
圖16.評估板CDB8422電路圖(12): 電源
圖17.評估板CDB8422元件布局圖
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