AD1893_15 datasheet(9/20 Pages) AD

Part #	AD1893

Description	Low Cost SamplePort 16-Bit Stereo Asynchronous Sample Rate Converter

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AD1893

REV. A

–9–

AMP

TIME

SUBFILTER COEFFICIENTS

ALIGNED TO THE LEFT

TSIN = 1/FSIN

FREQ

FSIN/2

PHASE

DELAY = NOMINAL

DELAY = NOMINAL – .25/FSIN

DELAY = NOMINAL – .5/FSIN

DELAY = NOMINAL – .75/FSIN

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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