AD9244 datasheet(14/36 Pages) AD

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REV. A

–14–

AD9244

–120

–20

–40

–60

–80

–100

SNR = 62.6dBc

SFDR = 60.7dBc

FREQUENCY – MHz

30 32.5

TPC 25. Dual-Tone FFT with fIN–1 = 239.1 MHz and

fIN–2 = 240.7 MHz (AIN–1 = AIN2 = –6.5 dBFS)

–120

–20

–40

–60

–80

–100

FREQUENCY – MHz

30 32.5

SNR = 73.0dBFS

THD = –89.5dBFS

NOTE: SPUR FLOOR

BELOW 90dBFS @ 240MHz

TPC 26. Driving ADC Inputs with Transformer

and Balun, fIN = 240 MHz, AIN = –8.5 dBFS

INPUT FREQUENCY – MHz

105

100

250

100

150

200

TPC 27. CMRR vs. Input Frequency (AIN = 0 dBFS

and CML = 2.5 V)

AIN – dBFS

–25

–20

–15

–10

–6

100

SNR – dBc

–30

SFDR – dBFS

SNR – dBFS

SFDR – dBc

SFDR = 90dBc

REFERENCE LINE

TPC 28. Dual-Tone SNR/SFDR vs. A

IN with fIN–1 =

239.1

MHz and fIN–2 = 240.7 MHz

AIN – dBFS

–21

–18

–15

–12

–9

–6

–3

SNR – dBc

SNR – dBFS

SFDR – dBc

SFDR – dBFS

SFDR = 90dBc

REFERENCE LINE

TPC 29. 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

TPC 30. Driving ADC Inputs with Transformer

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

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