Provides 1Msps latency-free output

Linear Technology Korea (CEO Hong Sa-kwak) announced the release of a highly precise 32-bit SAR (successive approximation register) analog-to-digital converter (ADC; product name: LTC2508-32).

Numerous high-performance applications, including data acquisition, industrial control, and medical instrumentation, require both accuracy and speed. These requirements were often met by using a high-resolution delta-sigma ADC and a high-speed SAR ADC in the same system. The LTC2508-32 simplifies such hybrid ADC systems by simultaneously providing a 32-bit low-noise digital filter output and a 14-bit 1 Msps latency-free output.

Since the output is generated from a single 32-bit SAR ADC core, high precision and high-speed output are perfectly provided. High precision and high-speed output are matched even when operating temperature, power, and intensity vary. Unlike existing solutions that use two separate, non-matched ADCs, the LTC2508-32 independently integrates both accuracy and speed, enabling much superior system performance while reducing solution size and component count.

The LTC2508-32 is ideal for applications requiring both precise measurement and fast signal tracking. Providing a dynamic range of up to 145 dB while ensuring excellent maximum linearity of 3.5 ppm, the LTC2508-32 supports precise measurement even in the presence of noise. At the same time, the high-speed 1 Msps output provides 14-bit differential and 8-bit common mode from the input signal, enabling sophisticated control loop design by utilizing the initial detection mechanism. The LTC2508-32 directly digitizes the input signal across the entire input range with a common mode rejection function of over 120 dB while improving system accuracy.

The LTC2508-32 incorporates a highly integrated digital filter that can be configured to optimize noise performance and bandwidth for 32-bit high-accuracy output, as well as a digital filter that provides a dynamic range of up to 145 dB at an output data rate of 61 sps. The integrated digital filter attenuates out-of-band noise by a minimum of 80 dB, thereby alleviating the requirement for analog anti-aliasing filters and significantly simplifying system complexity. The data rate reduction of the digitally filtered output supports seamless communication with low-speed processors.

The LTC2508-32 consumes 24mW of power from a single 2.5V supply. The LTC2508-32 is supplied in a space-saving 7mm × 4mm 24-pin DFN package. The LTC2508-32 is priced at $8.95 per unit in 1,000-unit quantities.