Datasheet > LF3321

LF3321

更新时间： 2024-11-09 04:20:31

品牌	Logo	应用领域
逻辑 - LOGIC		/
页数	文件大小	规格书
28页	1033K
描述
Horizontal Digital Image Filter Improved Performance

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LF3321 数据手册

LF3321

Horizontal Digital Image Filter

DEVICES INCORPORATED

Improved Performance

FEATURES

Supports Interleaved Data Streams

111 MHz Data Rate

Supports Decimation up to 16:1 for Increas-

ing Number of Filter Taps

12-bit Data or Coefﬁcients (Expandable to 24-bit)

32-Tap FIR Filter, Cascadable for More Filter Taps

3.3 Volt Power Supply

144 Lead PQFP

LF Interface™ Allows All 256 Coefﬁcient Sets to be

Updated Within Vertical Blanking

Over 49 K-bits of on-board Memory

Various Operating Modes: Dual Filter, Single Filter,

Double Wide Data or Coefﬁcient, Matrix Multiplica-

tion, and Accumulator Access.

Selectable 16-bit Data Output with User-Deﬁned

Rounding and Limiting

DESCRIPTION

The LF3321 is an improved version of the LF3320 Horizontal Digital Image Filter capable of operating at

speeds of up to 111MHz. This improved speed increases ﬂexibility and performance and enables the user

to utilize this device in more applications. For example, four interleaved data streams of 27MHz can now

be processed within one device. The part is functionally identical to the LF3320 with the exception that the

ﬁlter data path is speciﬁed to operate faster than the LF Control Interface. When operating the ﬁlter at

speeds in excess of 90MHz, loading of coefﬁcients via the LF Interface must be throttled to a maximum

of 90MHz by asserting the PAUSE pin as required to allow sufﬁcient setup time for the conﬁguration data

provided to the chip via the LF Interface.

Figure 1. Switching Waveforms: LF Interface^TM

CLK

tPWL

tPWH

tS0

tLH

tCYC

LDA

LDB

tPS

tPH

PAUSEA

PAUSEB

tCFH

tCFS

ADDRESS

CFA 11-0

CFB 11-0

CF0

CF1

Figure 1 demonstrates the switching waveforms, while the switching characteristics are given in Table

1. The LF3321 ﬁlters digital images in the horizontal dimension at real-time video rates. The input and

coefﬁcient data are both 12 bits and in two’s complement format. The output is also in two’s complement

format and may be rounded to 16 bits.

The LF3321 is designed to take advantage of symmetric coefﬁcient sets. When symmetric coefﬁcient sets

are used, the device can be conﬁgured as a single 32-tap FIR ﬁlter or as two separate 16-tap FIR ﬁlters.

When asymmetric coefﬁcient sets are used, the device can be conﬁgured as a single 16-tap FIR ﬁlter or as

two separate 8-tap FIR ﬁlters. Multiple LF3321s can be cascaded to create larger ﬁlters.

Interleave/Decimation Registers (I/D Registers) allow interleaved data to be fed directly into the device and

ﬁltered without separating the data into individual data streams.

The LF3321 can handle a maximum of sixteen data sets interleaved together. The I/D Registers and

on-chip accumulators facilitate using decimation to increase the number of ﬁlter taps. Decimation of up

to 16:1 is supported.

The LF3321 contains enough on-board memory to store 256 coefﬁcient sets. Two separate LF Interfaces^TM

allow all 256 coefﬁcient sets to be updated within vertical blanking.

Video Imaging Products

LOGIC Devices Incorporated

Feb 5, 2003 LDS.3321-A

12 3 4 5 6 7...28

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与LF3321相关器件

型号	品牌	获取价格	描述	数据表
LF3321Q5	LOGIC	获取价格	Digital Filter, PQFP144
LF3321QC9	LOGIC	获取价格	Digital Filter, 12-Bit, CMOS, PQFP144, PLASTIC, QFP-144
LF3324BGC	LOGIC	获取价格	Memory Circuit, 1MX24, CMOS, PBGA172, LBGA-172
LF3330	LOGIC	获取价格	Vertical Digital Image Filter
LF3330FMB12	ETC	获取价格	Digital Filter
LF3330FMB15	ETC	获取价格	Digital Filter
LF3330FMB18	ETC	获取价格	Digital Filter
LF3330FMB25	ETC	获取价格	Digital Filter
LF3330QC12	LOGIC	获取价格	Vertical Digital Image Filter
LF3330QC12G	LOGIC	获取价格	Digital Filter, 12-Bit, CMOS, PQFP100, GREEN, PLASTIC, QFP-100

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