The LTC®2453 is an ultra-tiny, fully differential, 16-bit,
analog-to-digital converter. The LTC2453 uses a single
2.7V to 5.5V supply and communicates through an I2C
interface. The ADC is available in an 8-pin, 3mm × 2mm DFN
package or 8-pin, 3mm × 3mm TSOT package. It includes
an integrated oscillator that does not require any external
components. It uses a delta-sigma modulator as a converter
core and has no latency for multiplexed applications. The
LTC2453 includes a proprietary input sampling scheme
that reduces the average input sampling current several
orders of magnitude lower than conventional delta-sigma
converters. Additionally, due to its architecture, there is
negligible current leakage between the input pins.
The LTC2453 can sample at 60 conversions per second,
and due to the very large oversampling ratio, has ex-tremely
relaxed antialiasing requirements. The LTC2453 includes
continuous internal offset and full-scale calibration algorithms which are transparent to the user, ensuring accuracy
over time and over the operating temperature range. The
converter has external REF+ and REF– pins and the differential input voltage range can extend up to ±(VREF+ – VREF–).
Following a single conversion, the LTC2453 can auto-matically
enter a sleep mode and reduce its power to less than 0.2μA.
If the user reads the ADC once a second, the LTC2453 consumes an average of less than 50μW from a 2.7V supply