Datasheet LTC2446, LTC2447 (Analog Devices) - 3

LTC2446/LTC2447
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3, 4) PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) 0.1V ≤ VREF ≤ VCC, –0.5 • VREF ≤ VIN ≤ 0.5 • VREF, (Note 5) l 24 Bits Integral Nonlinearity VCC = 5V, REF+ = 5V, REF– = GND, VINCM = 2.5V, (Note 6) l 5 15 ppm of VREF REF+ = 2.5V, REF– = GND, VINCM = 1.25V, (Note 6) 3 ppm of VREF Offset Error 2.5V ≤ REF+ ≤ VCC, REF– = GND, GND ≤ IN+ = IN– ≤ VCC (Note 12) l 2.5 5 µV Offset Error Drift 2.5V ≤ REF+ ≤ VCC, REF– = GND, GND ≤ IN+ = IN– ≤ VCC 20 nV/°C Positive Full-Scale Error REF+ = 5V, REF– = GND, IN+ = 3.75V, IN– = 1.25V l 10 50 ppm of VREF REF+ = 2.5V, REF– = GND, IN+ = 1.875V, IN– = 0.625V l 10 50 ppm of VREF Positive Full-Scale Error Drift 2.5V ≤ REF+ ≤ VCC, REF– = GND, IN+ = 0.75REF+, 0.2 ppm of VREF/°C IN– = 0.25 • REF+ Negative Full-Scale Error REF+ = 5V, REF– = GND, IN+ = 1.25V, IN– = 3.75V l 10 50 ppm of VREF REF+ = 2.5V, REF– = GND, IN+ = 0.625V, IN– = 1.875V l 10 50 ppm of VREF Negative Full-Scale Error Drift 2.5V ≤ REF+ ≤ VCC, REF– = GND, IN+ = 0.25 • REF+, 0.2 ppm of VREF/°C IN– = 0.75 • REF+ Total Unadjusted Error 5V ≤ VCC ≤ 5.5V, REF+ = 2.5V, REF– = GND, VINCM = 1.25V 15 ppm of VREF 5V ≤ VCC ≤ 5.5V, REF+ = 5V, REF– = GND, VINCM = 2.5V 15 ppm of VREF REF+ = 2.5V, REF– = GND, VINCM = 1.25V, (Note 6) 15 ppm of VREF Input Common Mode Rejection DC 2.5V ≤ REF+ ≤ VCC, REF– = GND, GND ≤ IN– = IN+ ≤ VCC 120 dB
ANALOG INPUT AND REFERENCE The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IN+ Absolute/Common Mode IN+ Voltage l GND – 0.3V VCC + 0.3V V IN– Absolute/Common Mode IN– Voltage l GND – 0.3V VCC + 0.3V V VIN Input Differential Voltage Range l –VREF/2 VREF/2 V (IN+ – IN–) REF+ Absolute/Common Mode REF+ Voltage l 0.1 VCC V REF– Absolute/Common Mode REF– Voltage l GND VCC – 0.1V V VREF Reference Differential Voltage Range l 0.1 VCC V (REF+ – REF–) CS(IN+) IN+ Sampling Capacitance 2 pF CS(IN–) IN– Sampling Capacitance 2 pF CS(REF+) REF+ Sampling Capacitance 2 pF CS(REF–) REF– Sampling Capacitance 2 pF IDC_LEAK(IN+, IN–, REF+, REF–) Leakage Current, Inputs and Reference CS = VCC, IN+ = GND, IN– = GND, l –15 1 15 nA REF+ = 5V, REF– = GND ISAMPLE(IN+, IN–, REF+, REF–) Average Input/Reference Current Varies, See Applications Section nA During Sampling tOPEN MUX Break-Before-Make 50 ns QIRR MUX Off Isolation VIN = 2VP-P DC to 1.8MHz 120 dB 24467fb For more information www.linear.com/LTC2446 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuit Timing Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts