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LTC2446 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2446 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LTC2446/LTC2447 1 24467fa FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO ■ Flow ■ Weight Scales ■ Pressure ■ Direct Temperature Measurement ■ Gas Chromatography ■ Five Selectable Differential Reference Inputs ■ Four Differential/Eight Single-Ended Inputs ■ 4-Way MUX for Multiple Ratiometric Measurements ■ Up to 8kHz Output Rate ■ Up to 4kHz Multiplexing Rate ■ Selectable Speed/Resolution: 2 µVRMS Noise at 1.76kHz Output Rate 200nVRMS Noise at 13.8Hz Output Rate with Simultaneous 50/60Hz Rejection ■ Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions ■ 0.0005% INL, No Missing Codes ■ Autosleep Enables 20 µA Operation at 6.9Hz ■ <5 µV Offset (4.5V < VCC < 5.5V, –40°C to 85°C) ■ Differential Input and Differential Reference with GND to VCC Common Mode Range ■ No Latency Mode, Each Conversion is Accurate Even After a New Channel is Selected ■ Internal Oscillator—No External Components ■ LTC2447 Includes MUXOUT/ADCIN for External Buffering or Gain ■ Tiny QFN 5mm x 7mm Package 24-Bit High Speed 8-Channel ∆Σ ADCs with Selectable Multiple Reference Inputs The LTC ®2446/LTC2447 4-terminal switching enables multiplexed ratiometric measurements. Four sets of se- lectable differential inputs coupled with four sets of differ- ential reference inputs allow multiple RTDs, bridges and other sensors to be digitized by a single converter. A fifth differential reference input can be selected for any input channel not requiring ratiometric measurements (ther- mocouples, voltages, current sense, etc.). The flexible input multiplexer allows single-ended or differential in- puts coupled with a slaved reference input or a universal reference input. A proprietary delta-sigma architecture results in absolute accuracy (offset, full-scale, linearity) of 15ppm, noise as low as 200nVRMS and speeds as high as 8kHz. Through a simple 4-wire interface, ten speed/resolution combina- tions can be selected. The first conversion following a speed, resolution, channel change or reference change is valid since there is no settling time between conversions, enabling scan rates of up to 4kHz. Additionally, a 2x mode can be selected for any speed-enabling output rates up to 8kHz with one cycle of latency. , LTC and LT are registered trademarks of Linear Technology Corporation. LTC2446 Speed vs RMS Noise Multiple Ratiometric Measurement System CONVERSION RATE (Hz) 1 0.1 1 10 100 10 100 24467 TA02 1000 10000 2.8 µV AT 880Hz 280nV AT 6.9Hz (50/60Hz REJECTION) VCC = 5V VREF = 5V VIN + = V IN – = 0V 2x SPEED MODE NO LATENCY MODE VARIABLE SPEED/ RESOLUTION 24-BIT ∆Σ ADC + – 19-INPUT 4-OUTPUT MUX • • • REF+ VCC LTC2446 IN+ IN– REF– CS SDI SDO SCK 24467 TA01 Protected by U.S. Patents, including 6140950, 6169506, 6208279, 6411242, 6639526 |
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