
MAX5894
14-Bit, 500Msps, Interpolating and Modulating
Dual DAC with CMOS Inputs
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23
Figure 12. Spectral Representation of 8x Interpolation Filter with fIM/4 Modulation and Highpass Mode Enabled (Output Frequencies
are Relative to the Data Input Frequency, fS)
fS
2fS
3fS
4fS
5fS
6fS
7fS
8fS
fS
2fS
3fS
4fS
5fS
6fS
7fS
8fS
fS
2fS
3fS
4fS
5fS
6fS
7fS
8fS
fS
2fS
3fS
4fS
5fS
6fS
7fS
8fS
fS
2fS
3fS
4fS
5fS
6fS
7fS
8fS
fS
2fS
3fS
4fS
5fS
6fS
7fS
8fS
FILTER
RESPONSE
FILTER
RESPONSE
INPUT
SPECTRUM
AND FIRST
FILTER
RESPONSE
OUTPUT
SPECTRUM
OF THE
FIRST
FILTER
INPUT
SPECTRUM
AND
SECOND
FILTER
RESPONSE
OUTPUT
SPECTRUM
OF THE
SECOND
FILTER
OUTPUT
SPECTRUM
OF THE
MODULATOR
OUTPUT
SPECTRUM
OF THE
THIRD
FILTER
2x INTERPOLATION
4x INTERPOLATION
8x INTERPOLATION
NO INTERPOLATION
SIGNAL
IMAGE
SIGNAL
IMAGE
SIGNAL
IMAGE
SIGNAL
IMAGE
fS
2fS
3fS
4fS
5fS
6fS
7fS
8fS
FILTER
RESPONSE
INPUT
SPECTRUM
AND THIRD
FILTER
RESPONSE
SIGNAL
FOR COMPLEX MODULATION THE MODULATION SIGN (BIT 1, ADDRESS 01h) SELECTS UPPER OR LOWER SIDEBAND
LOWER
SIDEBAND
UPPER
SIDEBAND
SIGNAL