Datasheet LTC2494 (Analog Devices) - 9

LTC2494
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 VIN(CM) = 1.25V 2 VIN(CM) = 1.25V VCC = 5V fO = GND fO = GND 12 VREF = 5V ) VIN = 0V 1 1 REF GAIN = 128 85°C REF 85°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) 2494 G28 2494 G29 2494 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 V) 194 TA = 25°C V) f V) O = GND 0.6 192 210 190 200 0.4 188 RMS NOISE (µ V 190 CC = 5V V OFFSET ERROR (µ IN = 0V OFFSET ERROR (µ 186 180 0.2 VIN(CM) = GND 184 fO = GND TA = 25°C 182 170 GAIN = 128 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) 2494 G31 2494 G32 2494 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 V) TA = 25°C V) TA = 25°C –40 IN– = GND f 150 210 O = GND –60 TA = 25°C 200 100 –80 190 REJECTION (dB) OFFSET ERROR (µ OFFSET ERROR (µ –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) 2494 G34 2494 G35 2494 G36 2494fe For more information www.linear.com/LTC2494 9