HSP43220JC-25Z View Datasheet(PDF) - Intersil

Part Name

Description

MFG CO.

HSP43220JC-25Z

Decimating Digital Filter

Intersil 

HSP43220

F_BYP = 0

OUT_SELH = 1

28 - 21

F_BYP

OUT_SELH

88

MUX

8

2-16 - 2-23

F_BYP = 0

OUT_SELH = 0

OR

F_BYP = 1

40

20 - 2-15 16 16

F_BYP = 0

MUX

2-16 - 2-31

F_BYP = 1

F_BYP

16

OUT_ENX

OUT_ENP

DATA_OUT16-23

DATA_OUT0 -15

FIGURE 10. FIR OUTPUT FORMATTER

INPUT DATA FORMAT

Fractional Two's Complement Input

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

-20 . 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-12 2-13 2-14 2-15

FIR COEFFICIENT FORMAT

Fractional Two's Complement Input

19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4

-20 . 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-12 2-13 2-14 2-15

3210

2-16 2-17 2-18 2-19

FOR: OUT_SELH = 1, F_BYP = 0

23 22 21 20 19 18 17 16

-28 27 26 25 24 23 22 21

OUTPUT DATA FORMAT

Fractional Two's Complement Output

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

20 . 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-12 2-13 2-14 2-15

FOR: OUT_SELH = 0, F_BYP = 0

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

-20 . 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-12 2-13 2-14 2-15

23 22 21 20 19 18 17 16

2-16 2-17 2-18 2-19 2-20 2-21 2-22 2-23

FOR: OUT_SELH = X, F_BYP = 1

23 22 21 20 19 18 17 16

2-16 2-17 2-18 2-19 2-20 2-21 2-22 2-23

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

2-16 2-17 2-18 2-19 2-20 2-21 2-22 2-23 2-24 2-25 2-26 2-27 2-28 2-29 2-30 2-31

FIGURE 11.

Operational Section

Start Configurations

The scenario to put the DDF into operational mode is: reset

the DDF by asserting the RESET input, configure the DDF

over the control bus, and apply a start signal, either by

ASTARTIN or STARTIN. Until the DDF is put in operational

mode with a start pulse, the DDF ignores all data inputs.

To use the asynchronous start, an asynchronous active low

pulse is applied to the ASTARTIN input. ASTARTIN is

internally synchronized to the sample clock, CK_IN, and

generates STARTOUT. This signal is also used internally

when the asynchronous mode is selected. It puts the DDF in

operational mode and allows the DDF to begin accepting

data. When the ASTARTIN input is being used, the STARTIN

input must be tied high to ensure proper operation.

To start the DDF synchronously, the STARTIN is asserted

with a active low pulse that has been externally

synchronized to CK_IN. Internally the DDF then uses this

start pulse to put the DDF in operate mode and start

accepting data inputs. When STARTIN is used to start the

DDF the ASTARTIN input must be tied high to prevent false

starts.

12

FN2486.10

October 10, 2008

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