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LTC2420CS8 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2420CS8 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  1 LTC2420 20-Bit µPower No Latency ∆ΣTM ADC in SO-8 s Weight Scales s Direct Temperature Measurement s Gas Analyzers s Strain Gauge Transducers s Instrumentation s Data Acquisition s Industrial Process Control s 4-Digit DVMs No Latency ∆Σ is a trademark of Linear Technology Corporation. MICROWIRE is a trademark of National Semiconductor Corporation. Total Unadjusted Error (3V Supply) , LTC and LT are registered trademarks of Linear Technology Corporation. s 20-Bit ADC in SO-8 Package s 8ppm INL, No Missing Codes at 20 Bits s 4ppm Full-Scale Error s 0.5ppm Offset s 1.2ppm Noise s Digital Filter Settles in a Single Cycle. Each Conversion Is Accurate, Even After an Input Step s Fast Mode: 16-Bit Noise, 12 Bits TUE at 100sps s Internal Oscillator—No External Components Required s 110dB Min, 50Hz/60Hz Notch Filter s Reference Input Voltage: 0.1V to VCC s Live Zero—Extended Input Range Accommodates 12.5% Overrange and Underrange s Single Supply 2.7V to 5.5V Operation s Low Supply Current (200 µA) and Auto Shutdown s Pin Compatible with 24-Bit LTC2400 The LTC ®2420 is a micropower 20-bit A/D converter with an integrated oscillator, 8ppm INL and 1.2ppm RMS noise that operates from 2.7V to 5.5V. It uses delta-sigma technology and provides a digital filter that settles in a single cycle for multiplexed applications. Through a single pin, the LTC2420 can be configured for better than 110dB rejection at 50Hz or 60Hz ±2%, or it can be driven by an external oscillator for a user-defined rejection frequency in the range 1Hz to 800Hz. The internal oscillator requires no external frequency setting components. The converter accepts any external reference voltage from 0.1V to VCC. With its extended input conversion range of –12.5% VREF to 112.5% VREF, the LTC2420 smoothly resolves the offset and overrange problems of preceding sensors or signal conditioning circuits. The LTC2420 communicates through a flexible 3-wire digital interface which is compatible with SPI and MICROWIRE TM protocols. FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO VCC FO VREF SCK VIN SDO 1 2 3 4 8 7 6 5 GND CS REFERENCE VOLTAGE 0.1V TO VCC ANALOG INPUT RANGE –0.12VREF TO 1.12VREF = INTERNAL OSC/50Hz REJECTION = EXTERNAL CLOCK SOURCE = INTERNAL OSC/60Hz REJECTION 3-WIRE SPI INTERFACE 1 µF 2.7V TO 5.5V LTC2420 2420 TA01 VCC INPUT VOLTAGE (V) 0 2 6 10 2.0 2420 G01 –2 –6 0 4 8 –4 –8 –10 0.5 1.0 1.5 2.5 VCC = 3V VREF = 2.5V TA = –55°C, –45°C, 25°C, 90°C |
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