Sixteen-bit ADC Upgrades System Accuracy
Linear Technology introduced the LTC2450, a 16-bit delta sigma analog-to-digital converter (ADC) in a 2 mm <times> 2 mm DFN package that is said to enable performance upgrades to lower resolution systems. The LTC2450 achieves desirable 16-bit DC performance of 2 LSB integral nonlinearity error, 1.4 µVrms noise and 0.01 percent gain error. The small size and guaranteed 16-bit resolution allows designers to replace an embedded system’s integrated ADC or a lower performance ADC and its preamplifier circuitry. Using the 2.7V to 5.5V supply voltage as the reference, the LTC2450 draws 500 µA of supply current, minimizing power loss. After automatically entering a shutdown mode, supply current is reduced to -1 µA, further preserving battery power. By controlling the duration between conversions, the LTC2450’s power dissipation can be reduced to 50 µW at a 1 Hz 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. Prices begin at $1.15 each in 1,000-piece quantities.