Datasheet LTC1278 (Analog Devices) - 6

LTC1278
W U TYPICAL PERFORMANCE CHARACTERISTICS S/(N
+
D) vs Input Frequency Signal-to-Noise Ratio (without and Amplitude Harmonics) vs Input Frequency Distortion vs Input Frequency
80 80 0 VIN = 0dB fSAMPLE = 500kHz –10 70 70 –20 60 60 V –30 IN = –20dB 50 50 –40 40 40 –50 –60 30 30 2ND HARMONIC –70 20 V 20 IN = –60dB SIGNAL TO NOISE RATIO (dB) –80 THD SIGNAL/(NOISE + DISTORTION) (dB) 10 10 3RD HARMONIC –90 fSAMPLE = 500kHz fSAMPLE = 500kHz AMPLITUDE (dB BELOW THE FUNDAMENTAL) 0 0 –100 1k 10k 100k 1M 10M 1k 10k 100k 1M 10M 10k 100k 1M 2M INPUT FREQUENCY (Hz) INPUT FREQUENCY (Hz) INPUT FREQUENCY (Hz) LTC1278 G10 LTC1278 G5 LT1278 G6
Spurious Free Dynamic Range vs Acquisition Time vs Input Frequency Intermodulation Distortion Plot Source Impedance
0 0 4500 fSAMPLE = 500kHz f –10 SAMPLE = 500kHz f 4000 –20 IN1 = 96.80kHz –20 fIN2 = 101.68kHz 3500 –30 –40 3000 –40 2500 –50 –60 2000 –60 AMPLITUDE (dB) 1500 –70 –80 ACQUISITION TIME (ns) 1000 –80 –100 500 SPURIOUS FREE DYNAMIC RANGE (dB) –90 0 –100 –120 10 100 1k 10k 10k 100k 1M 2M 0 50k 100k 150k 200k 250k INPUT FREQUENCY (Hz) FREQUENCY (Hz) RSOURCE (Ω) LTC1278 G9 LTLTC1278 G11 LTC1278 G8
Power Supply Feedthrough Supply Current vs Temperature vs Ripple Frequency Reference Voltage vs Load Current
20 0 2.435 f f SAMPLE = 500kHz SAMPLE = 500kHz –20 2.430 15 –40 2.425 VSS (VRIPPLE = 10mV) 10 –60 2.420 DGND (VRIPPLE = 0.1V) –80 2.415 SUPPLY CURRENT (mA) 5 REFERENCE VOLTAGE (V) AVDD (VRIPPLE = 1mV) –100 2.410 0 –120 2.405 –55 –25 0 25 50 75 100 125 AMPLITUDE OF POWER SUPPLY FEEDTHROUGH (dB) 1k 10k 100k 1M – 5 – 4 –3 –2 –1 0 1 2 TEMPERATURE (C°) LOAD CURRENT (mA) RIPPLE FREQUENCY (Hz) LTC1278 G12 LTC1278 G3 LTC1278 G7 6