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AD6643 Datasheet(PDF) 25 Page - Analog Devices |
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AD6643 Datasheet(HTML) 25 Page - Analog Devices |
25 / 36 page ![]() AD6643 Rev. 0 | Page 25 of 36 33% BW 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 register (Address 0x3C) to 001. In this mode, the useful frequency range can be set using the 6-bit tuning word in the NSR tuning register (Address 0x3E). There are 34 possible tuning words (TW); 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 42 to Figure 44 show the typical spectrum that can be expected from the AD6643 in the 33% BW mode for three different tuning words. 0 –20 –40 –60 –80 –100 –120 –140 10 0 2030 40 50 60 708090 FREQUENCY (Hz) 200MSPS 140.1MHz @ –1.6dBFS SNR = 71.3dB (72.9dBFS) SFDR = 86dBc (IN BAND) Figure 42. 33% BW Mode, Tuning Word = 5 0 –20 –40 –60 –80 –100 –120 –140 10 0 2030 40 50 60 708090 FREQUENCY (Hz) 200MSPS 140.1MHz @ –1.6dBFS SNR = 71.4dB (73dBFS) SFDR = 86dBc (IN BAND) Figure 43. 33% BW Mode, Tuning Word = 17 (fS/4 Tuning) 0 –20 –40 –60 –80 –100 –120 –140 10 0 2030 40 50 60 708090 FREQUENCY (Hz) 200MSPS 140.1MHz @ –1.6dBFS SNR = 71.2dB (72.8dBFS) SFDR = 86dBc (IN BAND) Figure 44. 33% BW Mode, Tuning Word = 27 |
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