TMC2249A 查看數據表（PDF） - Raytheon Company

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TMC2249A

Digital Mixer 12 x 12 bit, 60 MHz

Raytheon Company 

TMC2249A

Digital Mixer

12 x 12 bit, 60 MHz

Electronics

Semiconductor Division

Features

• 60 MHz input and computation rate

• Two 12-bit multipliers

• Separate data and coefficient inputs

• Independent, user-selectable pipeline delays of 1 to 16

clocks on all input ports

• Separate 16-bit input port allows cascading or addition of

a constant

• User-selectable rounded output

• Internal 1/2 LSB rounding of products

• Fully registered, pipelined architecture

• Available in 120-Pin PPGA or MQFP

Applications

• Video switching

• Image mixing

• Digital signal modulation

• Complex frequency synthesis

• Digital filtering

• Complex arithmetic functions

Description

The TMC2249A is a high-speed digital arithmetic circuit

consisting of two 12-bit multipliers, an adder and a cascade-

able accumulator. All four multiplier inputs are simulta-

neously accessible to the user, and each includes a user-

programmable pipeline delay of up to 16 clocks in length.

The 24-bit adder/subtractor is followed by an accumulator

and 16-bit input port which allows the user to cascade multi-

ple TMC2249As. A new 16-bit accumulated output is avail-

able every clock, up to the maximum rate of 60 MHz. All

inputs and outputs are registered except the three-state out-

put enable, and all are TTL compatible.

The TMC2249A utilizes a pipelined, bus-oriented structure

offering significant flexibility. Input register clock enables

and programmable input data pipeline delays on each port

offer an adaptable input structure for high-speed digital

systems. Following the multipliers, the user may perform

addition or subtraction of either product, arithmetic rounding

to 16 bits, and accumulation and summation of products with

a cascading input. The output port allows access to all 24 bits

of the internal accumulator by switching between overlap-

ping least and most-significant 16-bit words, and

a three-state output enable simplifies connection to an exter-

nal system bus.

Logic Symbol

A11-0

ADEL3-0

ENA

B11-0

BDEL3-0

ENB

C11-0

CDEL3-0

ENC

D11-0

DDEL3-0

END

CAB15-0

TMC2249A

Digital Mixer

Delay

1-16

Delay

1-16

Delay

1-16

CLK

NEG1

NEG2

SWAP

OE

ACC

S15-0

Delay

1-16

65-2249A-01

RND

FT

CASEN

The TMC2249A has numerous applications in digital pro-

cessing algorithms, from executing simple image mixing and

switching, to performing complex arithmetic functions and

complex waveform synthesis. FIR filters, digital quadrature

mixers and modulators, and vector arithmetic functions may

also be implemented with this device.

Fabricated in a submicron CMOS process, the TMC2249A

operates at guaranteed clock rates of up to 60 MHz over the

full temperature and supply voltage ranges. It is pin- and

function-compatible with Raytheon’s TMC2249, while

providing higher speed operation and lower power dissipa-

tion. It is available in a 120 pin Plastic Pin Grid Array

(PPGA) and a 120 lead Metric Quad FlatPack (MQFP).

Rev. 1.0.0

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