24-bit 2-MS/s SAR ADC achieves 145-dB dynamic range

Milpitas, CA. Linear Technology Corp. has introduced the LTC2380-24, a no-latency 24-bit 2-MS/s successive approximation register (SAR) analog-to-digital converter (ADC). The LTC2380-24 features an integrated digital filter that averages 1 to 65,536 conversion results in real time, dramatically improving the dynamic range from 101 dB at 1.5 MS/s to 145 dB at an output data rate of 30.5 S/s. The LTC2380-24 is therefore suitable for seismic, medical, and other applications demanding high dynamic range.

Using an on-chip digital filter to average conversion results, the LTC2380-24 eliminates the processing burden from the digital host, conserving digital resources and the associated power. Moreover, the LTC2380-24 allows results to be read out with a serial clock as low as 2 MHz, easing interfacing to microprocessors and enabling use with slower devices. The LTC2380-24 achieves true 24-bit noise performance and features high DC accuracy with a maximum INL of ±3.5 ppm while dissipating 28 mW from a single 2.5-V supply.

The LTC2380-24 is available in small MSOP-16 and 4-mm x 3-mm DFN-16 packages, priced starting at $31.95 each in 1,000 piece quantities. It is drop-in compatible with the LTC2378-20 family of 1-MS/s 0.5-ppm INL no-latency SAR ADCs, allowing easy system upgrades to 24 bits. Samples and demo boards may be requested at www.linear.com/product/LTC2380-24 or by contacting your local Linear Technology sales office.