AD6657EBZ datasheet(23/32 Pages) AD

23 / 32 page

AD6657

Rev. 0 | Page 23 of 32

Figure 48 to Figure 50 show the typical spectrum that can be

expected from the AD6657 in the 33% BW mode for three

different tuning words.

020

–20

–40

–60

–80

–100

FREQUENCY (MHz)

fS = 184.32MSPS

fIN = 140MHz @ –1.6dBFS

NSR 33% BW MODE, TW = 5

SNR = 71dB (72.5dBFS) (IN-BAND)

SFDR = 92.5dBc (IN-BAND)

–120

Figure 48. 33% BW Mode, Tuning Word = 5

020

–20

–40

–60

–80

–100

–120

FREQUENCY (MHz)

fS = 184.32MSPS

fIN = 140MHz @ –1.6dBFS

NSR 33% BW MODE, TW = 17

SNR = 71.2dB (72.8dBFS) (IN-BAND)

SFDR = 93.7dBc (IN-BAND)

Figure 49. 33% BW Mode, Tuning Word = 17 (fS/4 Tuning)

020

–20

–40

–60

–80

–100

–120

FREQUENCY (MHz)

fS = 184.32MSPS

fIN = 140MHz @ –1.6dBFS

NSR 33% BW MODE, TW = 27

SNR = 71dB (72.5dBFS) (IN-BAND)

SFDR = 93dBc (IN-BAND)

Figure 50. 33% BW Mode, Tuning Word = 27

MODE PIN

The MODE pin input allows convenient control of the NSR

feature. A logic low enables NSR mode and a logic high sets the

receiver to straight 11-bit mode with NSR disabled. By default,

the MODE pin is pulled high internally to disable the NSR.

Each channel can be individually configured to ignore the

MODE pin state by writing to Bit 4 of the NSR control register

at Address 0x3C. Use of the NSR control register in conjunction

with the MODE pin allows for very flexible control of the NSR

feature on a per-channel basis.

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