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LT1787HS8 Datasheet(PDF) 1 Page - Linear Technology |
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LT1787HS8 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1787/LT1787HV 1787fc Precision, High Side Current Sense Amplifiers ■ Input Offset Voltage: 75 µV (Max) ■ 60V Supply Operation (LT1787HV) ■ 12-Bit Dynamic Range ■ Operating Current: 60 µA ■ User-Selectable External Sense Resistor ■ Bidirectional High Side Current Sensing ■ Unidirectional or Bidirectional Output ■ Input Noise Filtering ■ –40 °C to 125°C Operating Temperature Range ■ Available in 8-Lead SO and MSOP Packages The LT ®1787 is a complete micropower precision high side current sense amplifier. The LT1787 monitors bidi- rectional currents via the voltage across an external sense resistor. A current or voltage output indicates the direction and magnitude of the sense current. The LT1787 delivers greater than a 12-bit dynamic range with ultralow 40 µV input offset voltage compared to a typical 250mV full- scale input voltage. A fixed gain of 8 is set by onboard precision resistors. Input signal filtering is easily imple- mented 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 120dB. The LT1787/LT1787HV draw only 60 µA and are available in 8-lead SO and MSOP packages. ■ Battery Monitoring ■ Power Monitoring ■ Portable Phones ■ Cellular Phones ■ Portable Test/Measurement Systems ■ Battery-Operated Systems Input Offset Voltage vs Supply Voltage 12-Bit Dynamic Resolution Unidirectional Output into LTC ®1286 ADC TOTAL SUPPLY VOLTAGE (V) 0 10 20 30 40 1787 TA01b 50 50 40 30 20 10 0 –10 –20 –30 –40 –50 60 18 27 36 45 LT1787HV RSENSE 0.0016 Ω 1787 TA01 C1 1 µF 5V FIL+ FIL– R1 15k C2 0.1 µF VOUT = VBIAS + (8 • ILOAD • RSENSE) I = 100A 2.5V TO 60V TO LOAD LT1634-1.25 TO µP VREF VCC GND LTC1286 CS CLK DOUT +IN –IN VBIAS VOUT ROUT 20k VS – VS + DNC VEE APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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