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參數(shù)資料
| 型號(hào)： | HSP43881 |
| 廠商： | Intersil Corporation |
| 英文描述： | Digital Filter |
| 中文描述： | 數(shù)字濾波 |
| 文件頁數(shù)： | 10/21頁 |
| 文件大小： | 148K |
| 代理商： | HSP43881 |
10
Detailed operation of the DF to perform a basic 8-tap, 8-bit
coefficient, 8-bit data, 30MHz FIR filter is best understood by
observing the schematic (Figure 3) and timing diagram
(Figure 4). The internal pipeline length of the DF is four (4)
clock cycles, corresponding to the register levels CREG (or
XREG), MREG0, MREG1, and TREG (Figures 1 and 2).
Therefore, the delay from presentation of data and
coefficients at the DIN0-7 and CIN0-7 inputs to a sum
appearing at the SUM0-25 output is:
k + Td
Where:
k = filter length
Td = 4, the internal pipeline delay of DF
After the pipeline has filled, a new output sample is available
every clock. The delay to last sample output from last
sample input is Td.
The output sums, Yn, shown in the Timing Diagram are
derived from the sum of products equation:
Y(n) = C(0) x X(n) + C(1) x X(n1) + C(2) x X(n -2) + C(3)
x X(n -3) + C(4) x X(n -4) + C(5) x X(n -5) + C(6) x X(n -6)
+ C(7) x X(n -7)
Extended FIR Filter Length
Filter lengths greater that eight taps can be created by either
cascading together multiple DF devices or “reusing” a single
device. Using multiple devices, an FIR filter of over 1000-
taps can be constructed to operate at a 30MHz sample rate.
Using a single device clocked at 30MHz, a FIR filter of over
1000 taps can be constructed to operate at less than a
30MHz sample rate. Combinations of these two techniques
are also possible.
SAMPLE
DATA IN
(X
n
)
30MHz
CLOCK
3-BIT
COUNTER
Y
2
Y
1
Y
0
A2 A1 A0
D0-D7
8 x 8 COEFF.
RAM/ROM
SYSTEM
RESET
ERASE
+5V
SUM0-25
26
SUM
OUT
(Y
n
)
NC
NC
8
TCCO
COUT0-7
COENB
V
SS
ERASE
RESET
DCM0
DCM1
CIENB
CIN0-7
TCCI
CLK
TCS
DIENB
DIN0-7
HSP43881
8
8
SENBL
SENBH
SHADD
V
CC
ADR0
ADR1
ADR2
FIGURE 3. 30MHZ, 8 TAP FIR FILTER APPLICATION SCHEMATIC
HSP43881
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HSP43881 WAF | 制造商:Intersil Corporation 功能描述: |
| HSP43881/883 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Digital Filter |
| HSP43881883 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Digital Filter |
| HSP43881GC-20 | 制造商:Harris Corporation 功能描述: |
| HSP43881GC-25 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述: |
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