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參數(shù)資料
| 型號： | XWM9708 |
| 廠商： | Wolfson Microelectronics |
| 元件分類： | Codec |
| 英文描述： | AC97 Revision 2.1 Audio Codec |
| 中文描述： | AC97音頻編解碼器2.1版 |
| 文件頁數(shù)： | 11/28頁 |
| 文件大?。?/td> | 205K |
| 代理商： | XWM9708 |
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Advanced Information
WM9708
WOLFSON MICROELECTRONICS LTD
AI Rev 2.0 April 2001
11
VARIABLE SAMPLE RATE SUPPORT
The DACs and ADCs on this device support all the recommended sample rates specified in the Intel
Revision 2.1 specification for audio rates. The default rate is 48ks/s. If alternative rates are selected
and variable rate audio is enabled (Register 2Ah, bit 0), the AC
’
97 interface continues to run at 48k
words per second, but data is transferred across the link in bursts such that the net sample rate
selected is achieved. It is up to the AC
’
97 Revision 2.1 compliant controller to ensure that data is
supplied to the AC link, and received from the AC link, at the appropriate rate.
The device supports on demand sampling. That is, when the DAC signal processing circuits need
another sample, a sample request is sent to the controller which must respond with a data sample in
the next frame it sends. For example, if a rate of 24ks/s is selected, on average the device will
request a sample from the controller every other frame, for each of the stereo DACs. Note that if an
unsupported rate is written to one of the rate registers, the rate will default to the nearest rate
supported. The Register will then respond when interrogated with the default sample rate.
The left and right channels of the ADCs and DACs always sample at the same rate.
AUDIO
SAMPLE RATE
CONTROL VALUE
D15-D0
1F40
2B11
3E80
5622
7D00
AC44
BB80
8000
11025
16000
22050
32000
44100
48000
Table 1 Variable Sample Rates Supported
GAIN CONTROL REGISTER LOCATION
PGA
DAC
Mixer
Volume
CONTROL REGISTER
MUTE DEFAULT
Muted (bit-15)
Not-muted (bit-15)
Muted (15)
18h
72h
02h
Table 2 Gain Control Register Location
MASTER SUPPORT
WM9708 supports operation as a master codec. Fundamentally, a device identified as a
master produces a BITCLK as an input.
CONTROL INTERFACE
A digital interface has been provided to control the WM9708 and transfer data to and from it. This
serial interface is compatible with the Intel AC
’
97 specification.
The main control interface functions are:
Control of analogue gain and signal paths through the mixer
Bi-directional transfer of ADC and DAC words to and from AC
’
97 controller
Selection of Powerdown down modes.
相關(guān)PDF資料 |
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| XWM9708CDS | AC97 Revision 2.1 Audio Codec |
| XWT1205 | High Power Package Trim and Enable Pin |
| XWT2405-12 | High Power Package Trim and Enable Pin |
| XWT2405-15 | High Power Package Trim and Enable Pin |
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相關(guān)代理商/技術(shù)參數(shù) |
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| XWM9708CDS | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Revision 2.1 Audio Codec |
| XWM9710EFL/RV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio CODEC and Mixer with Integrated Headphone Driver |
| XWM9710EFL/V | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio CODEC and Mixer with Integrated Headphone Driver |
| XWM9710EFT/RV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio CODEC and Mixer with Integrated Headphone Driver |
| XWM9710EFT/V | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio CODEC and Mixer with Integrated Headphone Driver |
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