LF43168 Datasheet, PDF (1/16 Pages) LOGIC Devices Incorporated – Dual 8-Tap FIR Filter

DEVICES INCORPORATED
DEVICES INCORPORATED
LF43168
Dual_L8-_FTa₄p₃FI₁R₆Fi₈lter
Dual 8-Tap FIR Filter
FEATURES
DESCRIPTION
u 66 MHz Data and Computation Rate
u Two Independent 8-Tap or Single
16-Tap FIR Filters
u 10-bit Data and Coefficient Inputs
u 32 Programmable Coefficient Sets
u Supports Interleaved Coefficient Sets
u User Programmable Decimation up
to 16:1
u Maximum of 256 FIR Filter Taps,
16 x 16 2-D Kernels, or 10 x 20-bit
Data and Coefficients
u Replaces Harris HSP43168
u Package Styles Available:
• 84-pin Plastic LCC, J-Lead
• 100-pin Plastic Quad Flatpack
The LF43168 is a high-speed dual FIR
filter capable of filtering data at real-
time video rates. The device contains
two FIR filters which may be used as
two separate filters or cascaded to
form one filter. The input and coeffi-
cient data are both 10-bits and can be
in unsigned, two’s complement, or
mixed mode format.
The filter architecture is optimized for
symmetric coefficient sets. When
symmetric coefficient sets are used,
each filter can be configured as an 8-tap
FIR filter. If the two filters are cas-
caded, a 16-tap FIR filter can be
implemented. When asymmetric
coefficient sets are used, each filter is
configured as a 4-tap FIR filter. If both
filters are cascaded, an 8-tap filter can
be implemented. The LF43168 can
decimate the output data by as much
as 16:1. When the device is pro-
grammed to decimate, the number of
clock cycles available to calculate filter
taps increases. When configured for
16:1 decimation, each filter can be
configured as a 128-tap FIR filter (if
symmetric coefficient sets are used).
By cascading these two filters, the
device can be configured as a 256-tap
FIR filter.
There is on-chip storage for 32
different sets of coefficients. Each set
consists of eight coefficients. Access
to more than one coefficient set
facilitates adaptive filtering opera-
tions. The 28-bit filter output can be
rounded from 8 to 19 bits.
LF43168 BLOCK DIAGRAM
INB9-0/
OUT8-0
INA9-0
10
9
10
5
CSEL4-0
10
CIN9-0
9
A8-0
WR
COEFFICIENT
BANK A
FILTER
CELL A
COEFFICIENT
BANK B
FILTER
CELL B
CONTROL
OEL
OEH
MUX/ADDER
9
19
OUT27-9
Video Imaging Products
1
03/28/2000–LDS.43168-H