LTC2445CUHF#PBF

LTC2445 is an 8-channel (4-differential) channel high speed 24-bit No Latency ∆Σ™ ADC in 38 pin plastic QFN package. 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 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.

• Up to 8KHz output rate (external fO), up to 4KHz multiplexing rate (external fO)
• 2µVRMS noise at 1.76KHz output rate
• 200nVRMS noise at 13.8Hz output rate with simultaneous 50Hz/60Hz rejection
• 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
• Differential input and differential reference with GND to VCC common mode range
• Internal oscillator—no external components
• Operating temperature range from 0°C to 70°C

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