2-channel differential input 24-bit ADC
26 March 2003
Analogue, Mixed Signal, LSI
The LTC2412 is a 2-channel differential input micropower 24-bit no latency delta-sigma analog-to-digital converter with an integrated oscillator. Manufactured by Linear Technology, it provides 2 ppm INL and 0,16 ppm RMS noise over the entire supply range.
The two differential channels are converted alternately with channel ID included in the conversion results. It uses delta-sigma technology and provides single conversion settling of the digital filter.
Through a single pin, the LTC2412 can be configured for better than 110 dB input differential mode rejection at 50 Hz or 60 Hz ±2%, or it can be driven by an external oscillator for a user defined rejection frequency. The internal oscillator requires no external frequency setting components.
The converter accepts any external differential reference voltage from 0,1 V to VCC for flexible ratiometric and remote sensing measurement configurations. The full-scale differential input range is from -0,5 VREF to 0,5 VREF. The reference common mode voltage, VREFCM and the input common mode voltage, VINCM may be independently set anywhere within the GND to VCC. The DC common mode input rejection is better than 140 dB.
The LTC2412 communicates through a flexible 3-wire digital interface, which is compatible with SPI and Microwire protocols.
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