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Low noise 16-bit delta sigma A/D converter upgrades system accuracy

Milpitas, Calif.—Linear Technology Corp. has introduced the LTC2450, a 16-bit delta sigma A/D converter in a 2mm x 2mm DFN package that enables performance upgrades to lower resolution systems.

Designers of portable and space-constrained applications typically trade off space with performance, leading to use of microcontrollers with internal A/D converters or lower resolution A/D converters with preamplifier circuitry. These designs are typically complex and lag in performance due to larger linearity errors, greater noise, or other unguaranteed specifications.

In 4-mm² area, the LTC2450 achieves 16-bit DC performance of 2LSB integral nonlinearity error, 1.4µVRMS noise and 0.01% gain error. The tiny size and guaranteed 16-bit resolution allows designers to easily replace an embedded system's integrated A/D converter or a lower performance A/D converter and its preamplifier circuitry.

Using the 2.7V to 5.5V supply voltage as the reference, the LTC2450 draws just 500µA of supply current, minimizing power loss. After automatically entering a shutdown mode, supply current is reduced to less than 1µA, further preserving battery power. By controlling the duration between conversions, the LTC2450's power dissipation can be reduced to 50µW at a 1Hz output rate. An internal oscillator allows conversion rates up to 30 per second, making it easy to measure temperature, pressure, voltage, or other low-frequency sensor outputs.

The LTC2450 communicates via a 3-wire SPI-compatible interface while measuring a single-ended analog input that may extend from ground to VCC. The LTC2450 includes continuous internal offset and full-scale calibration of the input signal, ensuring accuracy over time and over the full operating temperature range.

Linear Technology's No Latency Delta Sigma design allows the A/D converter to multiplex several inputs with no delay in reading the output data. The LTC2450 incorporates a proprietary sampling network that reduces the input sampling current to less than 50nA, making possible a wide range of input protection and filter circuits.

Pricing: beginning at $1.15 each in 1,000-piece quantities.

Availability: Immediately in both commercial and industrial temperature grade versions.
Datasheet: click here.

Linear Technology Corp., 1-408-432-1900, www.linear.com

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