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Smallest 14-Bit, 4.5Msps SAR ADC Integrates Precision Reference in 8mm² TSOT-23 Package

The LTC2314-14 is a 14-bit, 4.5Msps, serial sampling A/D converter that draws only 6.2mA from a wide range analogue supply adjustable from 2.7V to 5.25V. It contains an integrated bandgap and reference buffer which provide a low cost, high performance (20ppm/°C max) and space saving applications solution.

This device achieves outstanding AC performance of 77dB SINAD and –85dB THD while sampling a 500kHz input frequency. The extremely high sample rate-to-power ratio makes the LTC2314-14 ideal for compact, low power, high speed systems including portable medical devices, communications systems and battery-operated systems.

In conjunction with Arrow Electronics Ltd.

The The LTC2314-14 from Linear Technology is a 14-bit 4.5Msps successive approximation register (SAR) ADC in a tiny 8-lead TSOT-23 package, offering up to 90% reduction in size over competing solutions for space-conscious applications.

This small SAR ADC integrates a precision 2.048V/4.096V reference with 7ppm/°C typical and guaranteed 20ppm/°C maximum temperature coefficient into an 8mm² footprint. The LTC2314-14 operates from a 3V or 5V supply and features the lowest power dissipation (18mW at 3V or 31mW at 5V) compared to other competitive parts on the market. With its serial SPI interface, tiny footprint and very low power dissipation, the LTC2314-14 is ideal for a wide range of portable and space-constrained applications, including medical devices, communications systems and battery-operated systems.

Also available is the The LTC2315-12, a 12-bit pin- and software-compatible version of the LTC2314-14, featuring a fast 5Msps sample rate. The LTC2314-14 and LTC2315-12 lead a family of 14- and 12-bit SAR ADCs featuring sample rates from 500ksps to 5Msps with 77.5dB SNR at 14 bits and 73dB SNR at 12 bits resolution. Accurate DC specifications include a maximum INL and DNL of ±3.75LSB and ±0.99LSB at 14-bits, and ±1.25LSB and ±0.99LSB at 12-bits, respectively.

The complete LTC2314 SAR ADC family offers single-ended unipolar inputs, small 8-lead TSOT-23 packages, precision integrated reference and low power dissipation with flexible 3V or 5V supply operation, along with nap and sleep modes for optimizing the power within a system.

The LTC2314-14 and LTC2315-12 are available in commercial, industrial and automotive (-40°C to 125°C) temperature grades. Pricing begins at $9.52 each for the LTC2314-14 and $5.17 each for the LTC2315-12 in 1,000-piece quantities.

The DC1563A evaluation board for the LTC2314 SAR ADC family is available at www.linear.com/demo or via a local Linear Technology sales office.


For more information, visit www.linear.com/product/LTC2314-14 and www.linear.com/product/LTC2315-12.

Author
Linear Technology (UK) Limited

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