AD9865 datasheet(13/49 Pages) AD

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AD9865

Data Sheet

Rev. B | Page 12 of 48

TYPICAL PERFORMANCE CHARACTERISTICS

Rx PATH TYPICAL PERFORMANCE CHARACTERISTICS

AVDD = CLKVDD = DVDD = DRVDD = 3.3 V, fOSCIN = fADC = 50 MSPS, low-pass filter’s f−3 dB = 22 MHz, AIN = −1 dBFS,

RIN = 50 Ω, half- or full-duplex interface, default power bias settings.

FREQUENCY (MHz)

6.25

12.50

18.75

25.00

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

FUND = –1dBFS

SINAD = 59.1dBFS

ENOB = 9.53 BITS

SNR = 60.2dBFS

THD = –65.2dBFS

SFDR = –64.9dBc (THIRD HARMONIC)

RBW = 12.21kHz

Figure 3. Spectral Plot with 4 k FFT of Input Sinusoid with

RxPGA = 0 dB and PIN = 9 dBm

FREQUENCY (MHz)

–30

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

RBW = 12.2kHz

Figure 4. Spectral Plot with 4 k FFT of 84-Carrier DMT Signal

with PAR = 10.2 dB, PIN = −33.7 dBm, and RxPGA = 36 dB

INPUT AMPLITUDE (dBFS)

0dBFS = 2V p-p

–21

–18

–15

–12

–9

–6

–3

–50

–92

–86

–80

–74

–68

–62

–56

SINAD @ 3.14V

SINAD @ 3.3V

SINAD @ 3.46V

THD @ 3.14V

THD @ 3.3V

THD @ 3.46V

Figure 5. SINAD and THD vs. Input Amplitude and Supply

(fIN = 8 MHz, LPF f−3 dB = 26 MHz; Rx PGA = 0 dB)

RxPGA GAIN (dB)

–6

10.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

1MHz

5MHz

10MHz

15MHz

20MHz

Figure 6. SINAD/ENOB vs. RxPGA Gain and Frequency

RxPGA GAIN (dB)

–6

–55

–85

–80

–75

–70

–65

–60

1MHz

5MHz

10MHz

15MHz

20MHz

Figure 7. THD vs. RxPGA Gain and Frequency

RxPGA GAIN (dB)

–6

–45

–80

–75

–70

–65

–60

–55

–50

SINAD @ +25

C

SINAD @ +85

C

SINAD @ –40

C

THD @ +25

C

THD @ +85

C

THD @ –40

C

Figure 8. SINAD/THD Performance vs. RxPGA Gain

and Temperature ( fIN = 5 MHz)

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