Datasheet LTC2412 (Analog Devices) - 7

LTC2412
TYPICAL PERFORMANCE CHARACTERISTICS Noise Histogram (Output Rate = Noise Histogram (Output Rate = Noise Histogram (Output Rate = 22.5Hz, VCC = 5V, VREF = 2.5V) 7.5Hz, VCC = 2.7V, VREF = 2.5V) 22.5Hz, VCC = 2.7V, VREF = 2.5V)
12 12 12 10,000 CONSECUTIVE GAUSSIAN 10,000 CONSECUTIVE GAUSSIAN 10,000 CONSECUTIVE GAUSSIAN READINGS DISTRIBUTION READINGS DISTRIBUTION READINGS DISTRIBUTION 10 VCC = 5V m = 0.014ppm 10 VCC = 2.7V m = 0.079ppm 10 VCC = 2.7V m = 0.177ppm VREF = 2.5V σ = 0.292ppm VREF = 2.5V σ = 0.298ppm VREF = 2.5V σ = 0.297ppm VIN = 0V VIN = 0V VIN = 0V 8 REF+ = 2.5V 8 REF+ = 2.5V 8 REF+ = 2.5V REF– = GND REF– = GND REF– = GND 6 IN+ = 1.25V IN+ = 1.25V IN+ = 1.25V IN– = 1.25V 6 IN– = 1.25V 6 IN– = 1.25V FO = 460800Hz FO = GND FO = 460800Hz 4 TA = 25°C 4 TA = 25°C 4 TA = 25°C NUMBER OF READINGS (%) NUMBER OF READINGS (%) NUMBER OF READINGS (%) 2 2 2 0 0 0 –1.6 –1.2 –0.8 –0.4 0 0.4 0.8 1.2 1.6 –1.6 –1.2 –0.8 –0.4 0 0.4 0.8 1.2 1.6 –1.6 –1.2 –0.8 –0.4 0 0.4 0.8 1.2 1.6 OUTPUT CODE (ppm OF VREF) OUTPUT CODE (ppm OF VREF) OUTPUT CODE (ppm OF VREF) 2410 G11 2412 G13 2412 G14
Long-Term Noise Histogram (Time = 60 Hrs, VCC = 5V, Consecutive ADC Readings RMS Noise VREF = 5V) vs Time vs Input Differential Voltage
12 1.0 0.5 GAUSSIAN DISTRIBUTION VCC = 5V m = 0.101837ppm 0.8 VREF = 5V 10 σ = 0.154515ppm ) REF+ = 5V 0.6 ) 0.4 REF– = GND REF 0.4 REF VINCM = 2.5V 8 ADC CONSECUTIVE F READINGS O = GND 0.2 0.3 T V A = 25°C CC = 5V 6 VREF = 5V 0 VIN = 0V REF+ = 5V –0.2 0.2 4 REF– = GND –0.4 IN+ = 2.5V NUMBER OF READINGS (%) V T IN+ = 2.5V RMS NOISE (ppm OF V IN– = 2.5V ADC READING (ppm OF V –0.6 CC = 5V A = 25°C 0.1 2 V REF+ = 5V IN– = 2.5V F REF = 5V O = GND V REF– = GND T –0.8 IN = 0V A = 25°C FO = GND 0 –1.0 0 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 0 5 10 15 20 25 30 35 40 45 50 55 60 –2.5 –2 –1.5 –1 –0.5 0 0.5 1 1.5 2 2.5 OUTPUT CODE (ppm OF VREF) TIME (HOURS) INPUT DIFFERENTIAL VOLTAGE (V) 2412 G16 2412 G17 2412 G18
RMS Noise vs VINCM RMS Noise vs Temperature (TA) RMS Noise vs VCC
850 850 850 REF+ = 2.5V 825 825 825 REF– = GND VREF = 2.5V 800 800 800 IN+ = GND IN– = GND 775 775 775 FO = GND TA = 25°C V 750 CC = 5V REF+ = 5V 750 750 REF– = GND VCC = 5V RMS NOISE (nV) 725 V 725 725 REF = 5V RMS NOISE (nV) REF+ = 5V RMS NOISE (nV) IN+ = VINCM REF– = GND 700 IN– = VINCM 700 IN+ = 2.5V 700 VIN = 0V IN– = 2.5V 675 FO = GND 675 VIN = 0V 675 TA = 25°C FO = GND 650 650 650 –0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 –50 –25 0 25 50 75 100 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 VINCM (V) TEMPERATURE (°C) VCC (V) 2412 G19 2412 G20 2412 G21 2412fa For more information www.linear.com/LTC2412 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Converter Characteristics Analog Input and Reference Digital Inputs and Digital Outputs Power Requirements Timing Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Test Circuit Applications Information Package Description Revision History Typical Application Related Parts