LT1787 Datasheet | Linear Technology

LT1787/LT1787HV Precision, High Side Current Sense Amplifiers Features s s s s s s s s s DESCRIPTIO Input Offset Voltage: 75µV (Max) 60V Supply Operation (LT1787HV) 12-Bit Dynamic Range Operating Current: 60µA User-Selectable External Sense Resistor Bidirectional High Side Current Sensing Unidirectional or Bidirectional Output Input Noise Filtering Available in 8-Lead SO and MSOP Packages U APPLICATIO S s s s s s s Battery Monitoring Power Monitoring Portable Phones Cellular Phones Portable Test/Measurement Systems Battery-Operated Systems The LT ®1787 is a plete micropower precision high side current sense amplifier. The LT1787 monitors bidirectional currents via the voltage across an external sense resistor. A current or voltage output depicts the direction and magnitude of the sense current. The LT1787 delivers greater than a 12-bit dynamic range with ultralow 40µV input offset voltage pared to a typical 250m V fullscale input voltage. A fixed gain of 8 is set by onboard precision resistors. Input signal filtering is easily implemented with a capacitor between the FIL- and FIL+ pins. The LT1787HV operates from 2.5V to 60V total supply voltage and the LT1787 operates from 2.5V to 36V total supply voltage. Both versions have a PSRR in excess of 120d B. The LT1787/LT1787HV draw only 60µA and are available in 8-lead SO and MSOP packages. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO 12-Bit Dynamic Resolution Unidirectional Output into LTC®1286 ADC TO LOAD I = 100A 1 FIL- LT1787HV RSENSE 0.0016Ω FIL+ 8 2.5V TO 60V INPUT OFFSET VOLTAGE (µV) 50 40 30 20 10 0 - 10 - 20 - 30 - 40 - 50 0 10 30 40 50 20 TOTAL SUPPLY VOLTAGE (V) 60 - 2 VS VS+ 7 3 4 DNC VEE VBIAS 6 ROUT 20k VOUT C2 0.1µF 5 R1 15k C1 1µF VREF VCC CS +IN LTC1286 CLK - IN D GND OUT 5V TO µP VOUT = VBIAS + (8 -...