LF3347

Features:

` 83 MHz Data Input and Computation Rate
` Four 12 x 12-bit Multipliers with Individual Data and Coefficient Inputs
` Four 256 x 12-bit Coefficient Banks
` 32-bit Accumulator
` Selectable 16-bit Data Output with User-Defined Rounding and Limiting
`Two's Complement Operands
`3.3 Volt Power Supply
` 5 Volt Tolerant I/O
` 120-pin PQFP


Pinout




Specifications

Storage temperature ............................................................................... 65  to +150
Operating ambient temperature ................................................................55  to +125
VCC supply voltage with respect to ground .................................................0.5 V to +4.5 V
Input signal with respect to ground ...............................................................0.5 V to 5.5 V
Signal applied to high impedance output ........................................................0.5 V to 5.5 V
Output current into low outputs .....................................................................................25 mA
Latchup current ..........................................................................................................> 400 mA
ESD Classification (MIL-STD-883E METHOD 3015.7) ...................................................... Class 3


Description

The LF3347 consists of an array of four 12 x 12-bit registered multipliers followed by two summers and a 32-bit accumulator. The LF3347 provides four 256 x 12-bit coefficient banks which are capable of storing 256 different sets of filter coefficients for the multiplier array. All multiplier data inputs are user accessible and can be updated every clock cycle with two's complement data. The pipelined architecture has fully registered input and output ports and
an asynchronous three-state output enable control to simplify the design of complex systems.

A 32-bit accumulator allows cumulative word growth which may be internally rounded to 16-bits. Output data is updated every clock cycle and may be held under user control. The data inputs/outputs and control inputs are registered on the rising edge of CLK. The Control/Coefficient Data Input, CC11-0, is registered on the rising edge of CCCLK.

The LF3347 is ideal for performing pixel interpolation in image manipulation and filtering applications. The LF3347 can perform a bilinear interpolation of an image (4-pixel kernels) at real-time video rates when usedwith an image resampling sequencer. Larger kernels or more complex functions can be realized by utilizing multiple devices.

Unrestricted access to all data ports and addressable coefficient banks provides the LF3347 with considerable flexibility in applications such as digital filters, adaptive FIR filters, mixers, and other similar systems requiring highspeedprocessing.