AD9865-EB datasheet(14/48 Pages) AD

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AD9865

Rev. A | Page 14 of 48

INPUT FREQUENCY (MHz)

–6

61.0

60.5

60.0

59.5

59.0

58.5

58.0

57.5

57.0

56.5

56.0

–52

–54

–56

–58

–60

–62

–64

–66

–68

–70

–72

SNR @ 3.13V

SNR @ 3.3V

SNR @ 3.47V

THD @ 3.13V

THD @ 3.3V

THD @ 3.47V

Figure 15. SNR and THD vs. Input Frequency and Supply

( LPF f−3 dB = 26 MHz; RxPGA = 0 dB)

RxPGA GAIN (dB)

–6

109.4

98.5

87.5

76.6

65.6

54.7

43.8

32.8

21.9

10.9

AD9865: +25

°C

AD9865: +85

°C

AD9865: –40

°C

Figure 16. Input Referred Integrated Noise and Noise Spectral Density vs.

RxPGA Gain (LPF f−3 dB = 26 MHz)

GAIN (dB)

–6

–5

–4

–3

–2

–1

DEVICE 1

DEVICE 2

DEVICE 3

DEVICE 4

Figure 17. Rx DC Offset vs. RxPGA Gain

INPUT FREQUENCY (MHz)

60.0

55.0

–20

–70

–60

–50

–40

–30

55.5

56.0

56.5

57.0

57.5

58.0

58.5

59.0

59.5

SNR @ 3.13V

SNR @ 3.3V

SNR @ 3.46V

THD @ 3.13V

THD @ 3.3V

THD @ 3.46V

Figure 18. SNR and THD vs. Sample Rate and Supply

(LPF Disabled; RxPGA = 0 dB;

fIN = 8 MHz)

CUTOFF FREQUENCY (MHz)

1020

3040

506070

Figure 19. SNR vs. Filter Cutoff Frequency

(50 MSPS; fIN = 5 MHz; AIN =

−1 dB; RxPGA = 48 dB)

RxPGA GAIN (dB)

–6

0.5

–0.5

–0.4

–0.3

–0.2

–0.1

0.1

0.2

0.3

0.4

AD9865: GAIN STEP ERROR @ +25

°C

AD9865: GAIN STEP ERROR @ +85

°C

AD9865: GAIN STEP ERROR @ –40

°C

Figure 20. RxPGA Gain Step Error vs. Gain (fIN = 10 MHz)

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