LTC2481 Typical perForMance characTerisTicsOffset Error vs VREFPSRR vs Frequency at VCC(2x Speed Mode)(2x Speed Mode) 240 0 VCC = 5V VCC = 4.1V DC 230 VIN = 0V REF+ = 2.5V V –20 IN(CM) = GND REF– = GND 220 TA = 25°C IN+ = GND V) –40 IN– = GND 210 TA = 25°C –60 200 –80 190 REJECTION (dB) OFFSET ERROR (µ –100 180 170 –120 160 –140 0 1 2 3 4 5 1 10 100 1k 10k 100k 1M VREF (V) FREQUENCY AT VCC (Hz) 2481 G37 2481 G38 PSRR vs Frequency at VCCPSRR vs Frequency at VCC(2x Speed Mode)(2x Speed Mode) 0 0 VCC = 4.1V DC ±1.4V VCC = 4.1V DC ±0.7V REF+ = 2.5V –20 REF+ = 2.5V REF– = GND –20 REF– = GND IN+ = GND IN+ = GND –40 IN– = GND –40 IN– = GND TA = 25°C TA = 25°C –60 –60 –80 –80 RREJECTION (dB) REJECTION (dB) –100 –100 –120 –120 –140 –140 0 20 40 60 80 100 120 140 160 180 200 220 30600 30650 30700 30750 30800 FREQUENCY AT VCC (Hz) FREQUENCY AT VCC (Hz) 2481 G39 2481 G40 pin FuncTionsREF+ (Pin 1), REF– (Pin 3): Differential Reference Input. IN+ (Pin 4), IN– (Pin 5): Differential Analog Input. The The voltage on these pins can have any value between voltage on these pins can have any value between GND GND and VCC as long as the reference positive input, – 0.3V and VCC + 0.3V. Within these limits the converter REF+, is more positive than the reference negative input, bipolar input range (VIN = IN+ – IN–) extends from –0.5 REF–, by at least 0.1V. • VREF /GAIN to 0.5 • VREF/GAIN. Outside this input V range the converter produces unique overrange and CC (Pin 2): Positive Supply Voltage. Bypass to GND (Pin 8) with a 1µF tantalum capacitor in parallel with 0.1µF underrange output codes. ceramic capacitor as close to the part as possible. 2481fd 10 For more information www.linear.com/LTC2481 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
