ADCs remove need for external reference
Linear Technology
LTC2460 ADC
Linear Technology has introduced the LTC2460 and the LTC2462, a pair of 16-bit delta sigma ADCs that integrate a precision reference in a tiny 3 x 3mm DFN package.
The integrated reference (2ppm/degC typical, 10ppm/degC maximum) allows precise measurements and removes the need for an external reference, a key benefit for space-constrained applications.
Both ADCs guarantee 16-bit no missing-code resolution.
This makes the LTC2460 and LTC2462 suitable for remote sensor battery-powered applications and industrial sensors monitoring temperature or pressure.
Operating from a single 2.7 to 5.5V supply, these ADCs can measure single-ended (LTC2460) or differential (LTC2462) sensors via an SPI serial interface.
With its internal 1.25V reference, the LTC2460 can measure a single-ended input from 0-1.25V, while the LTC2462 can measure a differential input up to +/-1.25V.
The LTC2460 and LTC2462 achieve excellent 16-bit DC performance of 1LSB (typical) integral nonlinearity error, 2.2uVRMS transition noise and 0.25 per cent maximum gain error.
These ADCs have an internal oscillator, another space-saving feature.
They operate up to 60 conversions per second, making it easy to measure temperature, pressure, voltage, or other low-frequency sensor signals.
The LTC2460 and LTC2462 draw 2.5mA (maximum) supply current at the 60Hz maximum sample rate with the internal reference active.
After each conversion, the ADC enters a shutdown mode, reducing supply current to less than 1.5mA (maximum).
Supply current can be further reduced to less than 2uA (maximum) in sleep mode.
The LTC2460 and LTC2462 also incorporate a proprietary input sampling network that reduces the dynamic input current to less than 50nA, making possible a range of external input filter and protection circuits.
The LTC2460 and LTC2462 join a range that includes the LTC2450 (single-ended input, VCC used as the reference) and LTC2452 (differential input, external reference required).
The LTC2450/LTC2452 ADCs should be used for applications that need to measure input signals greater than 1.25V.
The LTC2460 and LTC2462 are each available in 12-pin ultra-tiny 3 x 3mm DFN and MSOP packages.
They are available today in commercial and industrial temperature grade versions.
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