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The LTC2412 accepts two differential inputs, which are converted alternately without needing to be programmed. The full-scale input span is ?.5VREF to 0.5VREF where the reference voltage can be anywhere between 0.1V and VCC for flexible ratiometric and remote sensing configurations. An on-chip oscillator provides a selectable notch filter of 50Hz or 60Hz with rejection better than 110dB and eliminates costly external components. An external clock source can be used for rejection of frequencies other than 50Hz or 60Hz and the converter will adapt automatically.
The LTC2412 communicates through a 3-wire digital interface, which is compatible with the SPI protocol. The device is available in a 16-pin SSOP package, screened for industrial and commercial temperature ranges and pricing starts at $4.75 each in 1,000-piece quantities.
Summary of Features: LTC2412
2-Channel Differential Input with Automatic Channel Selection
Differential Reference with Ground to VCC Common Mode Range
2ppm INL, No Missing Codes
800nVRMS Noise, 2.5ppm Full-Scale Error and 0.1ppm Offset Error
Internal Oscillator ?No External Components Required
Low Supply Current: 200Plus 4 Autosleep
110dB Min, 50Hz or 60Hz Notch Filter
Single Supply 2.7V to 5.5V Operation