Datasheet LTC2485 (Analog Devices) - 9

LTC2485
Typical perForMance characTerisTics Integral Nonlinearity (2x Speed Integral Nonlinearity (2x Speed Noise Histogram Mode; VCC = 5V, VREF = 2.5V) Mode; VCC = 2.7V, VREF = 2.5V) (2x Speed Mode)
3 3 16 VCC = 5V VCC = 2.7V 10,000 CONSECUTIVE RMS = 0.86µV VREF = 2.5V VREF = 2.5V 14 READINGS AVERAGE = 0.184mV 2 VIN(CM) = 1.25V 2 VIN(CM) = 1.25V VCC = 5V 12 VREF = 5V ) VIN = 0V 1 1 REF T 90°C REF 90°C 10 A = 25°C 0 0 8 6 INL (ppm OF V –1 –45°C, 25°C INL (ppm OF V –1 –45°C, 25°C NUMBER OF READINGS (%) 4 –2 –2 2 –3 –3 0 –1.25 –0.75 –0.25 0.25 0.75 1.25 –1.25 –0.75 –0.25 0.25 0.75 1.25 179 181.4 183.8 186.2 188.6 INPUT VOLTAGE (V) INPUT VOLTAGE (V) OUTPUT READING (µV) 2485 G28 2485 G29 2485 G30
RMS Noise vs VREF Offset Error vs VIN(CM) Offset Error vs Temperature (2x Speed Mode) (2x Speed Mode) (2x Speed Mode)
1.0 200 240 V V 198 CC = 5V CC = 5V VREF = 5V 230 VREF = 5V 0.8 196 VIN = 0V VIN = 0V TA = 25°C 220 VIN(CM) = GND 194 0.6 192 210 190 200 0.4 188 RMS NOISE (µV) 190 OFFSET ERROR (µV) 186 OFFSET ERROR (µV) V 180 0.2 CC = 5V V 184 IN = 0V VIN(CM) = GND 182 170 TA = 25°C 0 180 160 0 1 2 3 4 5 –1 0 1 2 3 4 5 6 –45 –30 –15 0 15 30 45 60 75 90 VREF (V) VIN(CM) (V) TEMPERATURE (°C) 2485 G31 2485 G32 2485 G33
Offset Error vs VCC Offset Error vs VREF PSRR vs Frequency at VCC (2x Speed Mode) (2x Speed Mode) (2x Speed Mode)
250 240 0 VREF = 2.5V VCC = 5V VCC = 4.1V DC VIN = 0V 230 VIN = 0V –20 REF+ = 2.5V 200 VIN(CM) = GND VIN(CM) = GND REF– = GND TA = 25°C 220 TA = 25°C IN+ = GND –40 IN– = GND T 150 210 A = 25°C –60 200 100 –80 190 REJECTION (dB) OFFSET ERROR (µV) OFFSET ERROR (µV) –100 180 50 170 –120 0 160 –140 2.7 3 3.5 4 4.5 5 5.5 0 1 2 3 4 5 1 10 100 1k 10k 100k 1M VCC (V) VREF (V) FREQUENCY AT VCC (Hz) 2485 G34 2485 G35 2485 G36 2485fd For more information www.linear.com/LTC2485 9 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics (Normal Speed) Electrical Characteristics (2x Speed) Converter Characteristics Analog Input and Reference I2C Digital Inputs and Digital Outputs Power Requirements Timing Characteristics I2C Timing Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Applications Information Package Description Revision History Typical Application Related Parts