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(yè)數(shù)： 4/21頁(yè)
文件大?。?/td> 148K
代理商： HSP43881
4
Pin Description
SYMBOL
PIN
NUMBER
TYPE
DESCRIPTION
V
CC
A3, A10, B1,
D11, F10, J1,
K4, L7
+5V Power Supply Input.
V
SS
A1, A11, E2,
F1, E11, H11,
K3, K6, L9
Power Supply Ground Input.
CLK
G3
I
The CLK input provides the DF system sample clock. The maximum clock frequency is 30MHz.
DIN0-7
A58, B67, C67
I
These eight inputs are the data sample input bus. Eight bit data samples are synchronously loaded
through these pins to the X register of each filter cell simultaneously. The DIENB signal enables
loading, which is synchronous on the rising edge of the clock signal.
TCS
B5
I
The TCS input determines the number system interpretation of the data input samples on pins
DIN0-7 as follows:
TCS = Low
→
Unsigned Arithmetic.
TCS = High
→
Two's Complement Arithmetic.
The TCS signal is synchronously loaded into the X register in the same way as the DIN0-7
inputs.
DIENB
C5
I
A low on this enables the data sample input bus (DIN0-7) to all the filter cells. A rising edge of the
CLK signal occurring while DIENB is low will load the X register of every filter cell with the 8-bit value
present on DIN0-7. A high on this input forces all the bits of the data sample input bus to zero; a
rising CLK edge when DIENB is high will load the X register of every filter cell with all zeros. This
signal is latched inside the DF, delaying its effect by one clock internal to the DF. Therefore, it must
be low during the clock cycle immediately preceding presentation of the desired data on the
DIN0-7 inputs. Detailed operation is shown in later timing diagrams.
CIN0-7
B9-11,
C10-11, D10,
E9-10
I
These eight inputs are used to input the 8-bit coefficients. The coefficients are synchronously load-
ed into the C register of filter CELL 0 if a rising edge of CLK occurs while CIENB is low. The CIENB
signal is delayed by one clock as discussed below.
TCCI
A9
I
The TCCI input determines the number system interpretation of the coefficient inputs on pins CIN07
as follows:
TCCI = LOW E Unsigned Arithmetic.
TCCI = HIGH E Two's Complement Arithmetic.
The TCCI signal is synchronously loaded into the C register in the same way as the CIN0-7 inputs.
CIENB
B8
I
A low on this input enable the C register of every filter cell and the D registers (decimation) of every
filter cell according to the state of the DCM0-1 inputs. A rising edge of the CLK signal occurring while
CIENB is low will load the C register and appropriate D registers with the coefficient data present at
their inputs. This provides the mechanism for shifting the coefficients from cell to cell through the
device. A high on this input freezes the contents of the C register and the D registers ignoring the
CLK signal. This signal is latched and delayed by one clock internal to the DF. Therefore, it must be
low during the clock cycle immediately preceding presentation of the desired coefficient of the CIN0-
7 inputs. Detailed operation is shown in the Timing Diagrams Section.
COUT0-7
B2, C1-2,
D1-2, E1, E3,
F2
O
These eight three-state outputs are used to output the 8-bit coefficients from filter cell 7. These out-
puts are enabled by the COENB signal low. These outputs may be tied to the CIN0-7 inputs of the
same DF to recirculate the coefficients, or they may be tied to the CIN0-7 inputs of another DF to
cascade DFs for longer filter lengths.
TCCO
B3
O
The TCCO three-state output determines the number system representation of the coefficients out-
put on COUTO-7. It tracks the TCCI signal to this same DF. It should be tied to the TCCI input of the
next DF in a cascade of DFs for increased filter lengths. This signal is enabled by COENB low.
COENB
A2
I
A low on the COENB input enables the COUT0-7 and the TCCO output. A high on this input places
all these outputs in their high impedance state.
HSP43881
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