LTC2442

FEATURES ■ ■ ■ ■ ■ ■ LTC2442 24-Bit High Speed 4-Channel ΔΣ ADC with Integrated Amplifier DESCRIPTIO The LTC®2442 is an ultra high precision, variable speed, 24-bit ΔΣTM ADC with integrated amplifier. The amplifier can be configured as a buffer for easy input drive of high impedance sensors. 1 part-per-million (ppm) linearity is achievable when the amplifier is configured in unity gain. External resistors can be used to set a gain for increased resolution of low level input signals. The positive and negative amplifier supply pins may be tied directly to VCC (4.5V to 5.5V) and GND or biased above VCC and below GND for rail-to-rail input signals. The proprietary ΔΣ architecture ensures stable DC accuracy through continuous transparent calibration. Ten speed/resolution combinations from 6.9Hz/220nVRMS to 3.5kHz/25µVRMS can be selected with no latency or shift in DC accuracy. Additionally, a 2X speed mode can be selected enabling output rates up to 7kHz (8kHz with an external oscillator) with one cycle latency. Any combination of single-ended (up to 4 inputs) or differential (up to 2 inputs) can be selected with a common mode input range from ground to VCC. While operating in the 1X speed mode the first conversion following a new speed/resolution or channel selection is valid. , LTC and LT are registered trademarks of Linear Technology Corporation. No Latency ∆Σ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6140950, 6169506, 6411242, 6639526. ■ ■ ■ ■ ■ ■ 1ppm Linearity with No Missing Codes Integrated Amplifier for Direct Sensor Digitization 2 Differential or 4 Single-Ended Input Channels Up to 8kHz Output Rate Up to 4kHz Multiplexing Rate Selectable Speed/Resolution 2µVRMS Noise at 1.76kHz Output Rate 220nVRMS Noise at 13.8Hz Output Rate with Simultaneous 50Hz/60Hz Rejection Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions 0, this bit is HIGH. If VIN is