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LTC2487CDETRPBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC2487CDETRPBF Datasheet(HTML) 11 Page - Linear Technology |
11 / 32 page LTC2487 2487fa pin FuncTions selected inputs (IN+ and IN– ) provide a bipolar input range VIN = (IN+ – IN–) from –0.5 • VREF/Gain to 0.5 • VREF/Gain. Outside this input range, the converter produces unique over-range and under-range output codes. CH0 to CH3 (Pin 8-Pin 11): Analog Inputs. May be pro- grammed for single-ended or differential mode. VCC(Pin12):PositiveSupplyVoltage.BypasstoGNDwith a 10µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor as close to the part as possible. REF+, REF– (Pin 13, Pin 14): Differential Reference Input. The voltage on these pins can have any value between GND and VCC as long as the reference positive input, REF+, remains more positive than the negative reference input, REF–, by at least 0.1V. The differential voltage (VREF = REF+ – REF–) sets the full-scale range (–0.5 • VREF/Gain to 0.5 • VREF/Gain) for all input channels. Exposed Pad (Pin 15): Ground. This pin is ground and mustbesolderedtothePCBgroundplane.Forprototyping purposes, this pin may remain floating. FuncTional block DiagraM AUTOCALIBRATION AND CONTROL DIFFERENTIAL 3RD ORDER ∆Σ MODULATOR DECIMATING FIR ADDRESS INTERNAL OSCILLATOR I2C INTERFACE GND VCC CH0 CH1 CH2 CH3 COM MUX IN+ IN– CA0 SCL REF+ REF– CA1 SDA FO (INT/EXT) 2487 BD + – 1.7k TEMP SENSOR |
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