Datasheet LTC2415, LTC2415-1 (Analog Devices) - 7

LTC2415/LTC2415-1
TYPICAL PERFORMANCE CHARACTERISTICS Noise Histogram Noise Histogram Noise Histogram (Output Rate = 45Hz, (Output Rate = 15Hz, (Output Rate = 45Hz, VCC = 5V, VREF = 2.5V) VCC = 2.7V, VREF = 2.5V) VCC = 2.7V, VREF = 2.5V)
12 12 10 10,000 CONSECUTIVE GAUSSIAN 10,000 CONSECUTIVE GAUSSIAN 10,000 CONSECUTIVE GAUSSIAN READINGS DISTRIBUTION READINGS DISTRIBUTION READINGS DISTRIBUTION 10 VCC = 5V m = –209.3ppm 10 VCC = 2.7V m = –113.1ppm VCC = 2.7V m = –109.8ppm V 8 REF = 2.5V σ = 0.49ppm VREF = 2.5V σ = 0.59ppm VREF = 2.5V σ = 0.50ppm VIN = 0V VIN = 0V V 8 IN = 0V REF+ = 2.5V 8 REF+ = 2.5V REF+ = 2.5V REF– = GND REF– = GND 6 REF– = GND IN+ = 1.25V 6 IN+ = 1.25V 6 IN+ = 1.25V IN– = 1.25V IN– = 1.25V IN– = 1.25V FO = 460800Hz FO = GND 4 FO = 460800Hz 4 TA = 25°C 4 TA = 25°C TA = 25°C NUMBER OF READINGS (%) NUMBER OF READINGS (%) NUMBER OF READINGS (%) 2 2 2 0 0 0 –211.5 –210.5 –209.5 –208.5 –207.5 –116 –114.5 –113 –111.5 –110 –112 –110.9 –109.8 –108.6 –107.5 OUTPUT CODE (ppm OF VREF) OUTPUT CODE (ppm OF VREF) OUTPUT CODE (ppm OF VREF) 2415 G11 2415 G13 2415 G14
Long-Term Histogram Consecutive ADC Readings vs RMS Noise vs Input Differential (60Hrs) Time Voltage
12 –101.0 0.5 VCC = 5V GAUSSIAN V V IN+ = 2.5V REF = 5V DISTRIBUTION –101.5 CC = 5V 10 V V IN– = 2.5V IN = 0V m = –103.9ppm ) REF = 5V REF+ = 5V σ = 0.27ppm V F ) 0.4 REF –102.0 IN = 0V O = GND REF– = GND REF+ = 5V TA = 25°C REF 8 IN+ = 2.5V –102.5 REF– = GND IN– = 2.5V 0.3 –103.0 6 FO = GND TA = 25°C –103.5 VCC = 5V 0.2 VREF = 5V 4 –104.0 VINCM = 2.5V REF+ = 5V NUMBER OF READINGS (%) –104.5 RMS NOISE (ppm OF V 0.1 REF– = GND 2 ADC READINGS (ppm OF V FO = GND –105.0 TA = 25°C 0 –105.5 0 –103 –103.5 –104 –104.5 –105 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 (HRS) INPUT DIFFERENTIAL VOLTAGE (V) 2415 G16 2415 G17 2415 G18
RMS Noise vs VINCM RMS Noise vs Temperature (TA) RMS Noise vs VCC
1800 1400 1560 VCC = 5V IN+ = VINCM VREF = 5V IN– = VINCM 1520 VIN = 0V FO = GND 1600 REF+ = 5V TA = 25°C 1250 REF– = GND 1480 1440 1400 1100 VCC = 5V 1400 VREF = 2.5V V REF+ = 2.5V RMS NOISE (nV) IN = 0V RMS NOISE (nV) REF+ = 5V RMS NOISE (nV) REF– = GND 1200 1360 950 REF– = GND IN+ = GND IN+ = 2.5V IN– = GND IN– = 2.5V 1320 FO = GND FO = GND TA = 25°C 1000 800 1280 –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) 2415 G19 2415 G20 2415 G21 2415fa For more information www.linear.com/LTC2415 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Converter Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Analog Input and Reference The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Electrical Characteristics Digital Inputs and Digital Outputs The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3) Power Requirements The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) Analog Input and Reference The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Timing Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3,4) Typical Performance Characteristics Pin Functions Functional Block Diagram Test Circuits Applications Information Typical Applications PCB Layout and Film Package Description Revision History Typical Application Related Parts