The LTC2444/LTC2445/LTC2448/LTC2449 are 8-/16- channel (4-/8-differential) high speed 24-bit No Latency ∆∑ ADCs. They use a proprietary delta-sigma architecture enabling variable speed/resolution. Through a simple 4-wire serial interface, ten speed/resolution combinations 6.9Hz/280nVRMS to 3.5kHz/25µVRMS (4kHz with external oscillator) can be selected with no latency between conversion results or shift in DC accuracy (offset, full-scale, linearity, drift). Additionally, a 2X speed mode can be selected enabling output rates up to 7kHz (8kHz if an external oscillator is used) with one cycle latency. Any combination of single-ended or differential inputs can be selected with a common mode input range from ground to VCC, independent of VREF. While operating in the 1X speed mode the first conversion following a new speed, resolution, or channel selection is valid. Since there is no settling time between conversions, all 8 differential channels can be scanned at a rate of 500Hz. At the conclusion of each conversion, the converter is internally reset eliminating any memory effects between successive conversions and assuring stability of the high order delta-sigma modulator. Applications * High Speed Multiplexing * Weight Scales * Auto Ranging 6-Digit DVMs * Direct Temperature Measurement * High Speed Data Acquisition * Up to 8 Differential or 16 Single-Ended Input Channels * Up to 8kHz Output Rate * Up to 4kHz Multiplexing Rate * Selectable Speed/Resolution * 2µVRMS 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 20µA Operation at 6.9Hz * <5µV 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 * LTC2445/LTC2449 Include MUXOUT/ADCIN for External Buffering or Gain * Tiny QFN 5mm x 7mm Package https://elecena.pl/product/255362/24-bit-high-speed-8-16-channel-adcs-with-selectable-speed-resolution 2007-03-03 https://elecena.pl/product/255362/24-bit-high-speed-8-16-channel-adcs-with-selectable-speed-resolution 2017-10-10 https://elecena.pl/product/255362/24-bit-high-speed-8-16-channel-adcs-with-selectable-speed-resolution 2025-01-17