AD6649EBZ datasheet(13/40 Pages) AD

13 / 40 page

AD6649

Rev. 0 | Page 13 of 40

TYPICAL PERFORMANCE CHARACTERISTICS

AVDD = 1.8 V, DRVDD = 1.8 V, sample rate = 250 MSPS, DCS enabled, 1.75 V p-p differential input, VIN = −1.0 dBFS, 32k sample,

TA = 25°C, fixed-frequency NCO, 95 MHz BW FIR filter, unless otherwise noted. In the FFT plots that follow, the location of the second

and third harmonics is noted when they fall in the pass band of the filter. A −1.0 dBFS input level at the analog inputs corresponds to an

output level of −2.5 dBFS when using the fixed-frequency NCO and 95 MHz FIR filter. When using the tunable-frequency NCO and

100 MHz FIR filter, the output level is −1.3 dBFS. These respective output level reductions are due to FIR filter losses. See the FIR Filters

section for more details.

120

90 100 110

–20

–40

–60

–80

–120

–140

FREQUENCY (MHz)

–100

fS = 250MSPS

fIN = 30.1MHz @ –1.0dBFS

SNR = 72dB (74.5dBFS)

SFDR = 92dBc (IN-BAND)

THIRD HARMONIC

SECOND HARMONIC

Figure 5. AD6649 Single-Tone FFT with fIN = 30.1 MHz

–20

–40

–60

–80

–120

–140

–100

fS = 250MSPS

fIN = 90.1MHz @ –1.0dBFS

SNR = 71.6dB (74.1dBFS)

SFDR = 87.5dBc (IN-BAND)

THIRD HARMONIC

120

90 100 110

FREQUENCY (MHz)

SECOND HARMONIC

Figure 6. AD6649 Single-Tone FFT with fIN = 90.1 MHz

–20

–40

–60

–80

–120

–140

–100

fS = 250MSPS

fIN = 140.1MHz @ –1.0dBFS

SNR = 71.1dB (73.6dBFS)

SFDR = 85dBc (IN-BAND)

THIRD HARMONIC

120

90 100 110

FREQUENCY (MHz)

SECOND HARMONIC

Figure 7. AD6649 Single-Tone FFT with fIN = 140.1 MHz

–20

–40

–60

–80

–120

–140

–100

fS = 250MSPS

fIN = 185.1MHz @ –1.0dBFS

SNR = 70.5dB (73.0dBFS)

SFDR = 84.5dBc (IN-BAND)

THIRD HARMONIC

120

90 100 110

FREQUENCY (MHz)

Figure 8. AD6649 Single-Tone FFT with fIN = 185.1 MHz

120

90 100 110

–140

FREQUENCY (MHz)

–20

–40

–60

–80

–120

–100

fS = 250MSPS

fIN = 220.1MHz @ –1.0dBFS

SNR = 69.8dB (72.3dBFS)

SFDR = 84dBc (IN-BAND)

THIRD HARMONIC

SECOND HARMONIC

Figure 9. AD6649 Single-Tone FFT with fIN = 220.1 MHz

–20

–40

–60

–80

–120

–140

–100

fS = 250MSPS

fIN = 305.1MHz @ –1.0dBFS

SNR = 68.5dB (71.0dBFS)

SFDR = 83.5dBc (IN-BAND)

THIRD HARMONIC

120

90 100 110

FREQUENCY (MHz)

SECOND HARMONIC

Figure 10. AD6649 Single-Tone FFT with fIN = 305.1 MHz

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