Product category:
Analogue and Mixed Signal ICs
News Release from: Linear Technology Corp | Subject: LTC2450
Edited by the Electronicstalk Editorial
Team on 12 November 2007
Delta sigma design does away with delays
16bit delta-sigma A/D convertor in an ultrasmall 2 x 2mm DFN package enables performance upgrades to lower resolution systems.
Available now from Linear Technology, the LTC2450 is a 16bit delta-sigma A/D convertor (ADC) in an ultrasmall 2 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 ADCs or lower resolution ADCs with preamplifier circuitry
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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These designs are typically complex and lag in performance due to larger linearity errors, greater noise, or other unguaranteed specifications.
In only 4mm2 area, the versatile LTC2450 achieves excellent 16bit DC performance of 2LSB integral nonlinearity error, 1.4uV RMS noise and 0.01% gain error.
The tiny size and guaranteed 16bit resolution allows designers to easily replace an embedded system's integrated ADC or a lower performance ADC and its preamplifier circuitry.
Using the 2.7 to 5.5V supply voltage as the reference, the LTC2450 draws just 500uA of supply current, minimising power loss.
After automatically entering a shutdown mode, supply current is reduced to less than 1uA, further preserving battery power.
By controlling the duration between conversions, the LTC2450's power dissipation can be reduced to 50uW 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 simple three-wire SPI-compatible interface while measuring a single-ended analogue 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 ADC 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.
The LTC2450 is available in both commercial and industrial temperature grade versions today, with pricing beginning at US $1.15 each in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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