AD9680 datasheet(28/99 Pages) AD

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AD9680

Data Sheet

Rev. C | Page 26 of 97

ANALOG INPUT FREQUENCY (MHz)

985.3

1022.3

1110.3

1205.3

1315.3

1420.3

1510.3

SFDR (6.5×)

SNR (6.5×)

Figure 67. SNR/SFDR vs. fIN; 1 GHz < fIN < 1.5 GHz;

Buffer Control 1 (0x018) = 6.5×

ANALOG INPUT FREQUENCY (MHz)

1510.3

1600.3

1720.3

1810.3

1920.3

1950.3

SFDR (8.5×)

SNR (8.5×)

Figure 68. SNR/SFDR vs. fIN; 1.5 GHz < fIN < 2 GHz;

Buffer Control 1 (0x018) = 8.5×

FREQUENCY (MHz)

–120

–100

–80

–60

–40

–20

164

246

328

410

AIN1 AND AIN2 = –7dBFS

SFDR = 90dBFS

IMD2 = 90dBFS

IMD3 = 91dBFS

BUFFER CURRENT = 3.0×

Figure 69. Two-Tone FFT; fIN1 = 184 MHz, fIN2 = 187 MHz

FREQUENCY (MHz)

–120

–100

–80

–60

–40

–20

164

246

328

410

AIN1 AND AIN2 = –7dBFS

SFDR = 87dBFS

IMD2 = 92dBFS

IMD3 = 87dBFS

BUFFER CURRENT = 3.0×

Figure 70. Two-Tone FFT; fIN1 = 338 MHz, fIN2 = 341 MHz

INPUT AMPLITUDE (dBFS)

–120

–100

–80

–60

–40

–20

–87 –81 –75 –69 –63 –57 –51 –45 –39 –33 –27 –21 –15 –9

IMD3 (dBc)

IMD3 (dBFS)

SFDR (dBc)

SFDR (dBFS)

Figure 71. Two-Tone SFDR/IMD3 vs. Input Amplitude (AIN) with

fIN1 = 184 MHz and fIN2 = 187 MHz

INPUT AMPLITUDE (dBFS)

–120

–100

–80

–60

–40

–20

–87 –81 –75 –69 –63 –57 –51 –45 –39 –33 –27 –21 –15 –9

IMD3 (dBc)

IMD3 (dBFS)

SFDR (dBc)

SFDR (dBFS)

Figure 72. Two-Tone IMD3/SFDR vs. Input Amplitude (AIN) with

fIN1 = 338 MHz and fIN2 = 341 MHz

AD9680 Datasheet(PDF) 28 Page - Analog Devices

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