LTC2448 Datasheet | Linear Technology

LTC2444/LTC2445/ LTC2448/LTC2449 Features 24-Bit High Speed 8-/16-Channel ∆∑ ADCs with Selectable Speed/Resolution Description nn Up to 8 Differential or 16 Single-Ended Input Channels nn Up to 8k Hz Output Rate (External f O) nn Up to 4k Hz Multiplexing Rate (External f O) nn Selectable Speed/Resolution nn 2µVRMS Noise at 1.76k Hz Output Rate nn 200n VRMS Noise at 13.8Hz Output Rate with Simultaneous 50Hz/60Hz Rejection nn Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions nn 0.0005% INL, No Missing Codes nn Autosleep Enables 20µA Operation at 6.9Hz nn < 5µV Offset (4.5V < VCC < 5.5V, - 40°C to 85°C) nn Differential Input and Differential Reference with GND to VCC mon Mode Range nn No Latency Mode, Each Conversion is Accurate Even After a New Channel is Selected nn Internal Oscillator- No External ponents nn LTC2445/LTC2449 Include MUXOUT/ADCIN for External Buffering or Gain nn Tiny QFN 5mm × 7mm Package Applications nn High Speed Multiplexing nn Weight Scales nn Auto Ranging 6-Digit DVMs nn Direct Temperature Measurement nn High Speed Data Acquisition The LTC®2444/LTC2445/LTC2448/LTC2449 are 8-/16channel (4-/8-differential) high speed 24-bit No Latency ∆Σ™ ADCs. They use a proprietary delta-sigma architecture enabling variable speed/resolution. Through a simple 4-wire serial interface, ten speed/resolution binations 6.9Hz/280n VRMS to 3.5k Hz/25µVRMS (4k Hz 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 7k Hz (8k Hz if an external oscillator is used) with one cycle latency. Any bination of single-ended or differential inputs can be selected with a mon 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...