max5893egk-d Maxim Integrated Products, Inc., max5893egk-d Datasheet - Page 20

max5893egk-d

Manufacturer Part Number

max5893egk-d

Description

Max5893 12-bit, 500msps Interpolating And Modulating Dual Dac With Cmos Inputs

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX5893EGK-D.pdf (33 pages)

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The programmable interpolation filters multiply the

MAX5893 input data rate by a factor of 2x, 4x, or 8x to

separate the reconstructed waveform spectrum and the

DAC image. The original spectral images, appearing at

around multiples of the input data rate, are attenuated

by the internal digital filters. This feature provides three

benefits:

1) Image separation reduces complexity of analog

12-Bit, 500Msps Interpolating and Modulating

Dual DAC with CMOS Inputs

Figure 9. Spectral Representation of Interpolating Filter Responses (Output Frequencies are Relative to the Data Input Frequency, f

reconstruction filters.

INPUT

SPECTRUM

AND FIRST

FILTER

RESPONSE

OUTPUT

SPECTRUM

OF THE

FIRST

FILTER

INPUT

SPECTRUM

AND

SECOND

FILTER

RESPONSE

OUTPUT

SPECTRUM

OF THE

SECOND

FILTER

INPUT

SPECTRUM

AND THIRD

FILTER

RESPONSE

OUTPUT

SPECTRUM

OF THE

THIRD

FILTER

______________________________________________________________________________________

SIGNAL

IMAGE

FILTER

RESPONSE

FILTER

IMAGE

2) Lower input data rates eliminate board-level high-

3) Sin(x)/x rolloff is reduced over the effective bandwidth.

Figure 9 illustrates a practical example of the benefits

when using the MAX5893 in 2x, 4x, and 8x interpolation

modes with the third filter configured as a lowpass filter.

With no interpolation filter, the first image signal appears

in the second Nyquist zone between f

interpolating filter removes this image. In fact, all of the

speed data transmission.

FILTER

RESPONSE

IMAGE

/ 2 and f

NO INTERPOLATION

2x INTERPOLATION

4x INTERPOLATION

8x INTERPOLATION

. The first

)

max5893egk-d Maxim Integrated Products, Inc., max5893egk-d Datasheet - Page 20

max5893egk-d

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