參數(shù)資料
型號(hào)： AD1890JP
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： SamplePort Stereo Asynchronous Sample Rate Converters
中文描述： SPECIALTY CONSUMER CIRCUIT, PQCC28
封裝： PLASTIC, LCC-28
文件頁(yè)數(shù)： 8/20頁(yè)
文件大?。?/td> 416K
代理商： AD1890JP
AD1890/AD1891
–8–
REV. 0
Polyphase Filter Bank Model
Although less intuitively understandable than the interpolation/
decimation model, the polyphase filter bank model is useful to
explore because it more accurately portrays the operation of the
actual AD1890/AD1891 SamplePort hardware. In the polyphase
filter bank model, the stored FIR filter coefficients are thought
of as the impulse response of a highly oversampled 0 to 20 kHz
low-pass prototype filter, as shown in Figure 2. If this low-pass
filter is oversampled by a factor of N, then it can be conceptu-
ally decomposed into N different “subfilters,” each filter consist-
ing of a different subset of the original set of impulse response
samples. If the temporal position of each of the subfilters is
maintained, then they can be summed to recreate the original
oversampled impulse response. Since the original impulse
response is highly oversampled, the more sparsely sampled
subfilters still individually meet the Nyquist criterion (i.e., they
are adequately sampled). T he baseband magnitude and phase
responses of the subfilters are identical. T he out-of-band (i.e.,
alias) regions of the subfilters however have phase responses
which are shifted relative to one another, in a manner that
causes them to cancel when they are summed.
T he subfilter coefficients are then aligned to the left, as shown
in Figure 3, so that the first coefficient of each subfilter is
aligned to the first point on a coarse time scale. (T his concep-
tual step accounts for how the hardware implementation is able
to operate at the slower rate corresponding to the coarse time
scale.) Each subfilter has been shifted in time by a different
amount, and though they still share identical magnitude
responses, they now have in-band phase responses which have
fractionally different slopes (i.e., group delays).
AMP
TIME
OVERSAMPLED
LOW PASS FILTER
IMPULSE RESPONSE
DECOMPOSED INTO
FOUR SUBFILTERS
PHASE
90
0 Deg
180
270
1/4Fs
1/2Fs
3/4Fs
Fs
FREQ
AMP
1/4Fs
1/2Fs
3/4Fs
Fs
1/4Fs
1/2Fs
3/4Fs
Fs
1/4Fs
1/2Fs
3/4Fs
Fs
1/4Fs
1/2Fs
3/4Fs
Fs
Figure 2. Four Polyphase Subfilters in the Time and Frequency Domains
相關(guān)PDF資料
PDF描述
AD1890 SamplePort Stereo Asynchronous Sample Rate Converters
AD1891 SamplePort Stereo Asynchronous Sample Rate Converters
AD1895YRSRL SPACER NYLON #2 SCREW 13/16,1
AD1895YRS 192 kHz Stereo Asynchronous Sample Rate Converter
AD1895AYRS 10-Bit, Complete, 40 MSPS, dual Transmit D/A Converter; Package: Evaluation Boards; No of Pins: -; Temperature Range: Industrial
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD1890JP-REEL 制造商:Analog Devices 功能描述:Sample Rate Converter 28-Pin PLCC T/R 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel
AD1890JPZ 制造商:Analog Devices 功能描述:Sample Rate Converter 28-Pin PLCC 制造商:Analog Devices 功能描述:SAMPLE RATE CNVRTR 28PLCC - Rail/Tube
AD1890JPZ-REEL 制造商:Analog Devices 功能描述:Sample Rate Converter 28-Pin PLCC T/R
AD1891 制造商:AD 制造商全稱:Analog Devices 功能描述:SamplePort Stereo Asynchronous Sample Rate Converters
AD1891JN 制造商:Analog Devices 功能描述:Sample Rate Converter 28-Pin PDIP W 制造商:Analog Devices 功能描述:SAMPLE RATE CNVRTR 28PDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:IC, 16-BIT CONVERTER IC - Bulk
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*