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AD9244

Rev. C | Page 16 of 36

FREQUENCY (MHz)

32.5

30.0

–20

–40

–60

–80

–100

–120

SNR = 62.6dBc

SFDR = 60.7dBc

Figure 34. Dual-Tone with fIN−1 = 239.1 MHz and

fIN−2 = 240.7 MHz (AIN−1 = AIN−2 = –6.5 dBFS)

FREQUENCY (MHz)

–20

–10

–40

–30

–60

–50

–100

–110

–90

–80

–70

–120

SNR = 71.3dBc

THD = –90.8dBc

NOTE: SPUR FLOOR

BELOW 90dBFS @ 240MHz

Figure 35. Driving ADC Inputs with Transformer and Balun,

fIN = 240 MHz, AIN = –8.5 dBFS

INPUT FREQUENCY (MHz)

250

100

150

200

105

100

Figure 36. CMRR vs. Input Frequency (AIN = 0 dBFS and CML = 2.5 V)

AIN (dBFS)

–5

–30

–25

–20

–15

–10

100

SFDR = 90dBc

REFERENCE LINE

SNR (dBc)

SFDR (dBFS)

SNR (dBFS)

SFDR (dBc)

Figure 37. Dual-Tone SNR/SFDR vs. AIN with

fIN−1 = 239.1 MHz and fIN−2 = 240.7 MHz

AIN (dBFS)

–21

–18

–15

–12

–9

–6

–3

100

SNR (dBc)

SNR (dBFS)

SFDR (dBc)

SFDR (dBFS)

SFDR = 90dBc

REFERENCE LINE

Figure 38. Driving ADC Inputs with Transformer and

Balun SNR/SFDR vs. AIN, fIN = 240 MHz

AIN (dBFS)

–21

–18

–15

–12

–9

–6

–3

SNR (dBc)

SNR (dBFS)

SFDR (dBc)

SFDR (dBFS)

SFDR = 90dBc

REFERENCE LINE

Figure 39. Driving ADC Inputs with Transformer and

Balun SNR/SFDR vs. AIN, fIN = 190 MHz

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