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參數(shù)資料
| 型號： | AD1893JST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 消費家電 |
| 英文描述： | Low Cost SamplePort 16-Bit Stereo Asynchronous Sample Rate Converter |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, LQFP-44 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大小： | 216K |
| 代理商： | AD1893JST |
AD1893
REV. A
–9–
AMP
TIME
SUBFILTER COEFFICIENTS
ALIGNED TO THE LEFT
T
SIN
= 1/F
SIN
FREQ
F
SIN
/2
F
SIN
/2
F
SIN
/2
F
SIN
/2
F
SIN
/2
PHASE
DELAY = NOMINAL
DELAY = NOMINAL
DELAY = NOMINAL – .25/F
SIN
DELAY = NOMINAL – .5/F
SIN
DELAY = NOMINAL – .75/F
SIN
Figure 3. Four Polyphase Subfilters Realigned to Coarse Time Grid
POLYPHASE FILTER 1
POLYPHASE FILTER 2
POLYPHASE FILTER 3
POLYPHASE FILTER 4
POLYPHASE FILTER 5
POLYPHASE FILTER 6
POLYPHASE FILTER 7
INPUT
SIGNAL
POLYPHASE FILTER N-1
POLYPHASE FILTER N
SELECT
N TO 1
MUX
OUTPUT
SIGNAL
SAMPLE
CLOCK
TRACKING
CIRCUIT
Figure 4. Polyphase Filter Bank Model—Conceptual Block
Diagram
The full set of subfilters can be considered to form a parallel
bank of “polyphase” filters which have decrementing, linear
phase group delays. All of the polyphase filters conceptually
process the input signal simultaneously, as illustrated in Figure
4, at the input sample rate.
Asynchronous sample rate conversion under the polyphase filter
bank model is accomplished by selecting the output of a particu-
lar polyphase filter on the basis of the temporal relationship
between the input sample clock and the output sample clock
events. Figure 5 shows the desired filter group delay as a func-
tion of the relative time difference between the current output
sample clock and the last input sample clock. If an output
sample is requested late in the input sample period, then a short
filter delay is required, and if an output sample is requested
early in the input sample period, then a long filter delay is re-
quired. This nonintuitive result arises from the fact that FIR
filters always produce some delay, so that selecting a filter with
shorter delay moves the interpolated sample closer to the newest
input sample.
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| AD1893JSTZ | 功能描述:IC SAMPLE-RATE CONV 16BIT 44TQFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:SamplePort™ 其它有關(guān)文件:STA321 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應(yīng)用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
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| AD1895AYRSRL | 制造商:Analog Devices 功能描述:Sample Rate Converter 28-Pin SSOP T/R |
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