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LTC2422IMS Datasheet(PDF) 1 Page - Linear Technology |
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LTC2422IMS Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  1 LTC2421/LTC2422 24212f 1-/2-Channel 20-Bit µPower No Latency ∆ΣTMADCs in MSOP-10 s Weight Scales s Direct Temperature Measurement s Gas Analyzers s Strain Gauge Transducers s Instrumentation s Data Acquisition s Industrial Process Control No Latency ∆Σ is a trademark of Linear Technology Corporation. MICROWIRE is a trademark of National Semiconductor Corporation. Pseudo Differential Bridge Digitizer , LTC and LT are registered trademarks of Linear Technology Corporation. The LTC ®2421/LTC2422 are 1- and 2-channel 2.7V to 5.5V micropower 20-bit analog-to-digital converters with an integrated oscillator, 8ppm INL and 1.2ppm RMS noise. These ultrasmall devices use delta-sigma technology and a new digital filter architecture that settles in a single cycle. This eliminates the latency found in conventional ∆Σ converters and simplifies multiplexed applications. Through a single pin, the LTC2421/LTC2422 can be configured for better than 110dB rejection at 50Hz or 60Hz ±2%, or can be driven by an external oscillator for a user defined rejection frequency in the range 1Hz to 120Hz. The internal oscillator requires no external fre- quency setting components. These converters accept an external reference voltage from 0.1V to VCC. With an extended input conversion range of –12.5% VREF to 112.5% VREF (VREF = FSSET – ZSSET), the LTC2421/LTC2422 smoothly resolve the off- set and overrange problems of preceding sensors or signal conditioning circuits. The LTC2421/LTC2422 communicate through a 2- or 3-wire digital interface that is compatible with SPI and MICROWIRE TM protocols. s 20-Bit ADCs in Tiny MSOP-10 Packages s 1- or 2-Channel Inputs s Single Supply 2.7V to 5.5V Operation s Low Supply Current (200 µA) and Auto Shutdown s Automatic Channel Selection (Ping-Pong) (LTC2422) s No Latency: Digital Filter Settles in a Single Conversion Cycle s 8ppm INL, No Missing Codes s 4ppm Full-Scale Error s 0.5ppm Offset s 1.2ppm Noise s Zero Scale and Full Scale Set for Reference and Ground Sensing 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 Pin Compatible with LTC2401/LTC2402 ANALOG INPUT RANGE ZSSET – 0.12VREF TO FSSET + 0.12VREF (VREF = FSSET – ZSSET) VCC FO FSSET ZSSET SCK CH1 SDO GND CS REFERENCE VOLTAGE ZSSET + 0.1V TO VCC 0V TO FSSET – 100mV CH0 = INTERNAL OSC/50Hz REJECTION = EXTERNAL CLOCK SOURCE = INTERNAL OSC/60Hz REJECTION 3-WIRE SPI INTERFACE 1 µF 110 9 8 7 6 2 3 4 5 2.7V TO 5.5V LTC2422 24212 TA01 VCC VCC FSSET ZSSET SCK CH0 SDO FO CS CH1 GND LTC2422 3-WIRE SPI INTERFACE INTERNAL OSCILLATOR 60Hz REJECTION 1 9 2.7V TO 5.5V 8 7 10 6 24012TA02 2 4 3 5 DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
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