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參數(shù)資料
| 型號： | PCM2906DBR |
| 元件分類： | Codec |
| 英文描述： | STEREO AUDIO CODEC WITH USB INTERFACE SINGLE ENEDE ANALOG INPUT/OUTPUT AND S/PDIF |
| 中文描述： | 立體聲音頻編解碼器帶USB接口的單ENEDE模擬輸入/輸出和S / PDIF |
| 文件頁數(shù)： | 23/32頁 |
| 文件大?。?/td> | 299K |
| 代理商： | PCM2906DBR |
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SLES042A JUNE 2002 REVISED JUNE 2004
www.ti.com
23
Clock and Reset
The PCM2904/2906 requires a 12-MHz (
±
500 ppm) clock for the USB and audio functions. The clock can be
generated by a built-in oscillator with a 12-MHz crystal resonator. The 12-MHz crystal resonator must be
connected to XTI (pin 21) and XTO (pin 20) with one high-value (1-M
) resistor and two small capacitors, the
capacitance of which depends on the load capacitance of the crystal resonator. An external clock can be
supplied to XTI (pin 21). If an external clock is used, XTO (pin 20) must be left open. Because there is no clock
disabling signal, use of the external clock supply is not recommended. SSPND (pin 28) is unable to use clock
disabling.
The PCM2904/2906 has an internal power-on reset circuit, which is triggered automatically when V
BUS
(pin 3)
exceeds 2.5 V typical (2.7 V
to
2.2 V). About 700
μ
s is required until internal reset release.
Digital Audio Interface (PCM2906)
The PCM2906 employs S/PDIF for both input and output. Isochronous-out data from the host is encoded to
the S/PDIF output and the DAC analog output. Input data is selected from either the S/PDIF or ADC analog
input. When the device detects S/PDIF input and successfully locks the received data, the isochronous-in
transfer data source automatically selected is S/PDIF; otherwise, the data source selected is the ADC analog
input.
Supported Input Data (PCM2906)
The following data formats are accepted by S/PDIF for input and output. All other data formats are unusable
as S/PDIF.
48-kHz 16-bit stereo
44.1-kHz 16-bit stereo
32-kHz 16-bit stereo
Mismatch between the input data format and the host command may cause unexpected results, with the
following exceptions:
Recording in monaural format from stereo data input at the same data rate
Recording in 8-bit format from 16-bit data input at the same data rate
A combination of the two foregoing conditions is not accepted.
For playback, all possible data-rate sources are converted to the 16-bit stereo format at the same source data
rate.
Channel Status Information (PCM2906)
The channel status information is fixed as consumer application, PCM mode, copyright, and digital/digital
converter. All other bits are fixed as 0s except for the sample frequency, which is set automatically according
to the data received through the USB.
Copyright Management (PCM2906)
Isochronous-in data is affected by the serial copy management system (SCMS). When the control bit indicates
that the received digital audio data is original, the input digital audio data is transferred to the host. If the data
is indicated as first generation or higher, the transferred data is routed to the analog input.
Digital audio data output is always encoded as original with SCMS control.
The implementation of this feature is optional. It is the designer’s responsibility to determine whether to
implement this feature in a product or not.
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| PCM2906DBRG4 | 功能描述:接口—CODEC Ster Codec w/USB Ifc Snglend I/O & SPDI/F RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| PCM2912 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:AUDIO CODEC WITH USB INTERFACE, MONO MICROPHONE INPUT AND STEREO HEADPHONE OUTPUT |
| PCM2912A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:AUDIO CODEC WITH USB INTERFACE, MONO MICROPHONE INPUT AND STEREO HEADPHONE OUTPUT |
| PCM2912APJT | 功能描述:接口—CODEC 16B Audio CODEC w/ USB interface RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| PCM2912APJTR | 功能描述:接口—CODEC 16B Audio CODEC w/ USB interface RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
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