AD9643 datasheet(19/36 Pages) AD

19 / 36 page

AD9643

Rev. A | Page 19 of 36

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020

100

FREQUENCY (MHz)

210MSPS

89.12MHz @ –7dBFS

92.12MHz @ –7dBFS

SFDR = 88dBc (95dBFS)

Figure 24. AD9643-210 Two-Tone FFT with fIN1 = 89.12, fIN2 = 92.12 MHz,

fS = 210 MSPS

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020

100

FREQUENCY (MHz)

210MSPS

184.12MHz @ –7dBFS

187.12MHz @ –7dBFS

SFDR = 88dBc (95dBFS)

Figure 25. AD9643-210 Two-Tone FFT with fIN1 = 184.12, fIN2 = 187.12 MHz,

fS = 210 MSPS

100

140

160

120

100

180

200

SAMPLE RATE (MSPS)

SNR, CHANNEL B

SFDR, CHANNEL B

SNR, CHANNEL A

SFDR, CHANNEL A

Figure 26. AD9643-210 Single-Tone SNR/SFDR vs. Sample Rate (fS)

with fIN = 90.1 MHz

5000

4500

4000

3500

3000

2500

2000

1500

1000

500

N + 2 N + 3 N + 4 N + 5

N + 1

N – 1

N – 2

N – 3

N – 4

N – 5

OUTPUT CODE

1.44LSB rms

16,378 TOTAL HITS

Figure 27. AD9643-210 Grounded Input Histogram

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THIRD HARMONIC

SECOND HARMONIC

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203040

5060

7080

90 100 110 120

FREQUENCY (MHz)

250MSPS

90.1MHz @ –1dBFS

SNR = 70.6dB (71.6dBFS)

SFDR = 88dBc

Figure 28. AD9643-250 Single-Tone FFT with fIN = 90.1 MHz

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THIRD HARMONIC

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5060

8090 100 110 120

FREQUENCY (MHz)

250MSPS

185.1MHz @ –1dBFS

SNR = 70.6dB (71.6dBFS)

SFDR = 85dBc

SECOND HARMONIC

Figure 29. AD9643-250 Single-Tone FFT with fIN = 185.1 MHz

AD9643 Datasheet(PDF) 19 Page - Analog Devices

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