AD6673 datasheet(25/45 Pages) AD

25 / 45 page

Data Sheet

AD6673

Rev. C | Page 25 of 45

33% BANDWIDTH MODE (>60 MHz AT

184.32 MSPS)

The second bandwidth mode offers excellent noise performance

over 33% of the ADC sample rate (66% of the Nyquist band) and

can be centered by setting the NSR mode bits in the NSR control

range can be set using the 6-bit tuning word in the NSR tuning

each step is 0.5% of the ADC sample rate. The following three

equations describe the left band edge (f0), the channel center

(fCENTER), and the right band edge (f1), respectively:

f0 = fADC × .005 × TW

fCENTER = f0 + 0.165 × fADC

f1 = f0 + 0.33 × fADC

Figure 46 to Figure 48 show the typical spectrum that can be

expected from the AD6673 in the 33% bandwidth mode for

three different tuning words.

–120

–100

–80

–60

–40

–20

FREQUENCY (MHz)

100

fS = 250MSPS

fIN = 185.1MHz AT –1dBFS

SNR = 72dB

SFDR = 85dBc

Figure 46. 33% Bandwidth Mode, Tuning Word = 5

FREQUENCY (MHz)

100

–120

–100

–80

–60

–40

–20

fS = 250MSPS

fIN = 185.1MHz AT –1dBFS

SNR = 72dB

SFDR = 85dBc

Figure 47. 33% Bandwidth Mode, Tuning Word = 17 (fS/4 Tuning)

FREQUENCY (MHz)

100

–120

–100

–80

–60

–40

–20

fS = 250MSPS

fIN = 185.1MHz AT –1dBFS

SNR = 72dB

SFDR = 85dBc

Figure 48. 33% Bandwidth Mode, Tuning Word = 27

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