Datasheet LTC1285, LTC1288 (Analog Devices) - 6

LTC1285/LTC1288
W U TYPICAL PERFORMANCE CHARACTERISTICS Spurious-Free Dynamic Range vs Input Frequency S/(N + D) vs Input Level Attenuation vs Input Frequency
100 80 0 TA = 25°C 90 V 10 70 CC = 2.7V V 80 REF = 2.5V 20 f 60 IN = 1kHz 70 fSMPL = fSMPL(MAX) 30 60 50 40 50 40 50 40 60 30 ATTENUATION (%) 30 70 20 T T A = 25°C A = 25°C 20 80 V V CC = 2.7V CC = 2.7V V V 10 SPURIOUS-FREE DYNAMIC RANGE (dB) 10 REF = 2.5V 90 REF = 2.5V SIGNAL-TO-NOISE PLUS DISTORTION (dB) f f SMPL = fSMPL(MAX) SMPL = fSMPL(MAX) 0 0 100 1 10 100 – 45 – 40 – 35 – 30 – 25 – 20 – 15 – 10 – 5 0 1k 10k 100k 1M 10M INPUT FREQUENCY (kHz) INPUT LEVEL (dB) INPUT FREQUENCY (Hz) LTC1285/88 • G13 LTC1285/86 • TPC15 LTC1285/88 • TPC14
Power Supply Feedthrough 4096 Point FFT Plot Intermodulation Distortion vs Ripple Frequency
0 0 0 TA = 25°C TA = 25°C TA = 25°C VCC = 2.7V V – 10 CC = 2.7V VCC = 2.7V (VRIPPLE = 1mV) – 20 V – 20 REF = 2.5V VREF = 2.5V – 20 VREF = 2.5V fIN = 3.05kHz f1 = 2.05kHz fCLK = 120kHZ fCLK = 120kHz f2 = 3.05kHz – 30 – 40 – 40 fSMPL = 7.5kHz fSMPL = 7.5kHz – 40 – 60 – 60 – 50 – 60 MAGNITUDE (dB) – 80 MAGNITUDE (dB) – 80 FEEDTHROUGH (dB) – 70 – 80 – 100 – 100 – 90 – 120 – 120 –100 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 1k 10k 100k 1M 10M FREQUENCY (kHz) FREQUENCY (kHz) RIPPLE FREQUENCY (Hz) LTC1285/86 • TPC18 LTC1285/88 • TPC16 LTC1285/88 • TPC17
Maximum Clock Frequency Sample-and-Hold Acquisition Maximum Clock Frequency vs Source Resistance Time vs Source Resistance vs Supply Voltage
200 10000 300 T T T A = 25°C A = 25°C A = 25°C 180 280 V V V CC = 2.7V CC = 2.7V REF = 2.5V 160 VREF = 2.5V VREF = 2.5V 260 140 240 120 220 100 1000 200 80 180 V +INPUT IN 60 R + SOURCE 160 CLOCK FREQUENCY (kHz) V +INPUT –INPUT IN CLOCK FREQUENCY (kHz) 40 S & H ACQUISITION TIME (ns) 140 R – SOURCE –INPUT 20 120 0 100 100 0.1 1 10 1 10 100 1000 10000 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 SOURCE RESISTANCE (kΩ) SOURCE RESISTANCE (Ω) SUPPLY VOLTAGE (V) LTC1285/88 • G19 LTC1285/88 • TPC20 LTC1285/88 • TPC21 6