Datasheet LTC2249 (Analog Devices) - 6

LTC2249
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) 2249 G04 2249 G05 2249 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 50000 75 –10 45000 43161 74 –20 40000 73 –30 35969 35000 72 –40 30000 –50 71 25292 –60 25000 70 COUNT –70 20000 SNR (dBFS) 69 AMPLITUDE (dB) –80 15000 12558 68 –90 10000 67 –100 5194 6150 5000 66 –110 1987 26 552 178 –120 0 65 0 5 10 15 20 25 30 35 40 8201 8203 8205 8207 8209 0 50 100 150 200 FREQUENCY (MHz) CODE INPUT FREQUENCY (MHz) 2249 G07 2249 G08 2249 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 95 SFDR: DCS ON 95 90 90 90 SFDR SFDR: DCS OFF 80 85 85 SNR 80 SFDR (dBFS) 70 80 75 SNR AND SFDR (dBFS) SNR AND SFDR (dBFS) 60 75 70 SNR: DCS ON SNR: DCS OFF 65 50 70 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 (%) 2249 G10 2249 G11 2249 G12 2249fa 6