Datasheet > LF2249QC25

LF2249QC25

更新时间： 2024-11-21 22:15:39

品牌	Logo	应用领域
逻辑 - LOGIC		/
页数	文件大小	规格书
8页	72K
描述
12 x 12-bit Digital Mixer

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LF2249QC25 数据手册

LF2249

DEVICES INCORPORATED

12 x 12-bit Digital Mixer

LF2249

12 x 12-bit Digital Mixer

DEVICES INCORPORATED

FEATURES

DESCRIPTION

user control for subtraction of prod-

ucts. The sum of the products can

also be internally rounded to 16 bits

during the accumulation process.

The LF2249 is a high-speed digital

mixer comprised of two 12-bit

❑ 40 MHz Data and Computation Rate

❑ Two 12 x 12-bit Multipliers with

multipliers and a 24-bit accumulator.

All multiplier inputs are user acces-

sible, and each can be updated on

every clock cycle. The LF2249 utilizes

a pipelined architecture with fully

registered inputs and outputs and an

asynchronous three-state output

enable control for optimum flexibility.

Individual Data Inputs

❑ Separate 16-bit Input Port for

A separate 16-bit input port con-

nected to the accumulator is included

to allow cascading of multiple

LF2249s. Access to all 24 bits of the

accumulator is gained by switching

between upper or lower 16-bit words.

The accumulated output data is

updated on every clock cycle.

Cascading Devices

❑ Independent, User-Selectable 1–16

Clock Pipeline Delay for Each Data

Input

❑ User-Selectable Rounding of Products

❑ Fully Registered, Pipelined

Independent input register clock

enables allow the user to hold the

data inputs over multiple clock cycles.

Each multiplier input also includes a

user-selectable 1-16 clock pipeline

delay. The output of each multiplier

can be independently negated under

Architecture

❑ Three-State Outputs

❑ Fully TTL Compatible

All inputs and outputs of the LF2249

are registered on the rising edge of

clock, except for OE. Internal pipeline

registers for all data and control

inputs are provided to maintain

❑ Replaces TRW/ Raytheon/ Fairchild

TMC2249

❑ 120-pin PQFP

LF2249 BLOCK DIAGRAM

ADEL3-0

A11-0

ENA

BDEL3-0

B11-0

ENB

CDEL3-0

C11-0

ENC

DDEL3-0

D11-0

END

1–16

CLK

NEG

RND

ACC

2's COMP

CAS15-0

CASEN

SWAP

2 : 1

NOTE: NUMBERS IN REGISTERS INDICATED

NUMBER OF PIPELINE DELAYS.

15-0

Video Imaging Products

08/16/2000–LDS.2249-J

12 3 4 5 6 7 8

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