Datasheet LTC2239 (Analog Devices) - 6

LTC2239
W U TYPICAL PERFOR A CE CHARACTERISTICS 8192 Point FFT, fIN = 30MHz, 8192 Point FFT, fIN = 70MHz, 8192 Point FFT, fIN = 140MHz, –1dB, 2V Range –1dB, 2V Range –1dB, 2V Range
0 0 0 –10 –10 –10 –20 –20 –20 –30 –30 –30 –40 –40 –40 –50 –50 –50 –60 –60 –60 –70 –70 –70 AMPLITUDE (dB) –80 AMPLITUDE (dB) –80 AMPLITUDE (dB) –80 –90 –90 –90 –100 –100 –100 –110 –110 –110 –120 –120 –120 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 0 5 10 15 20 25 30 35 40 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) 2239 G04 2239 G05 2239 G06
8192 Point 2-Tone FFT, f SNR vs Input Frequency, IN = 28.2MHz and 26.8MHz, –1dB, 2V Range Grounded Input Histogram –1dB, 2V Range
0 140000 65 131072 –10 64 –20 120000 63 –30 100000 62 –40 –50 61 80000 –60 60 COUNT –70 60000 SNR (dBFS) 59 AMPLITUDE (dB) –80 40000 58 –90 57 –100 20000 56 –110 0 0 –120 0 55 0 5 10 15 20 25 30 35 40 510 511 512 0 50 100 150 200 FREQUENCY (MHz) CODE INPUT FREQUENCY (MHz) 2239 G07 2239 G08 2239 G09
SFDR vs Input Frequency, SNR and SFDR vs Sample Rate, SNR and SFDR –1dB, 2V Range 2V Range, fIN = 5MHz, –1dB vs Clock Duty Cycle
100 100 90 SFDR: DCS ON 95 85 90 90 SFDR 80 SFDR: DCS OFF 80 85 75 80 70 SFDR (dBFS) 70 75 SNR AND SFDR (dBFS) 65 SNR SNR AND SFDR (dBFS) SNR: DCS ON 60 70 60 SNR: DCS OFF 65 50 55 0 50 100 150 200 0 10 20 30 40 50 60 70 80 90 100 110 30 35 40 45 50 55 60 65 70 INPUT FREQUENCY (MHz) SAMPLE RATE (Msps) CLOCK DUTY CYCLE (%) 2239 G10 2239 G11 2239 G12 2239fa 6