AD6643 datasheet(25/36 Pages) AD

Part #	AD6643

Description	Dual IF Receiver 1.8 V supply voltages Internal ADC voltage reference

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Manufacturer	AD [Analog Devices]

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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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