Datasheet LTC2498 (Analog Devices) - 9

LTC2498
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 = 0.85µV VREF = 2.5V VREF = 2.5V 14 READINGS AVERAGE = 0.184mV 2 V 2 IN(CM) = 1.25V VIN(CM) = 1.25V VCC = 5V fO = GND fO = GND 12 VREF = 5V ) VIN = 0V 1 1 REF REF GAIN = 256 90°C 90°C 10 TA = 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) 2498 G28 2498 G29 2498 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 fO = GND 220 VIN(CM) = GND 194 TA = 25°C fO = GND 0.6 192 210 190 200 0.4 188 RMS NOISE (µV) 190 VCC = 5V OFFSET ERROR (µV) 186 OFFSET ERROR (µV) V 180 0.2 IN = 0V V 184 IN(CM) = GND fO = 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) 2498 G31 2498 G32 2498 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 fO = GND 220 fO = GND IN+ = GND TA = 25°C TA = 25°C –40 IN– = GND f 150 210 O = GND –60 TA = 25°C 200 100 –80 190 REJECTION (dB) OFFSET ERROR (µV) OFFSET ERROR (µV) –100 180 50 170 –120 0 160 –140 2 2.5 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) 2498 G34 2498 G35 2498 G36 2498fg For more information www.linear.com/LTC2498 9 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics (Normal Speed) Electrical Characteristics (2x Speed) Converter Characteristics Analog Input and Reference Digital Inputs and Digital Outputs Power Requirements Digital Inputs and Digital Outputs Typical Performance Characteristics Pin Functions Functional Block Diagram Test Circuits Timing Diagrams Applications Information Package Description Revision History Related Parts