The LTC2442CG#PBF is a 4-channel 24-bit high speed delta-sigma A/D Converter with an integrated amplifier. The amplifier can be configured as a buffer for easy input drive of high impedance sensors. 1ppm 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 (4.5 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.
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 50/60Hz rejection
Guaranteed modulator stability and lock-up immunity for any input and reference conditions
<5μV Offset (4.5V < VCC < 5.5V, -40 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
(EN)
