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18-Bit, 1-Msps, ±10.24-V true bipolar SAR ADC simplifies input signal conditioning

18-Bit, 1-Msps, ±10.24-V true bipolar SAR ADC simplifies input signal conditioning

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By eeNews Europe



The LTC2338-18 operates from a single 5V supply, achieves 100 dB SNR and -110dB THD and features an internal 2.048 V (20 ppm/°C max) reference and reference buffer. An input divider network scales and level shifts the input signal, eliminating complicated circuitry required to directly interface true bipolar signals.

The LTC2338-18 leads a pin- and software-compatible family of 18-bit serial SPI SAR ADCs with speeds ranging from 250 ksps to 1 Msps. A pin-compatible 16-bit and 18-bit family with pseudo differential true bipolar inputs (LTC2328-18) will also be available. The proprietary internal reference buffer maintains less than 1LSB error during sudden burst of conversions, enabling true one-shot operation after lengthy idle periods. These ADCs operate from a single 5 V supply and consume just 50 mW at 1 Msps. Power further reduces linearly at slower sample rates. A shutdown mode dissipates only 300 µW when idle.

The DC1908A demonstration board enables easy evaluation of the LTC2338 family in conjunction with the DC590B (QuikEval) or DC718C (PScope) data collection boards. The fully differential LTC2338-18 and pseudo differential LTC2328-18 families are available in small MSOP-16 packages in commercial, industrial and automotive temperature grades. Pricing begins at $29.10 in 1,000 piece quantities.

More information about the LTC2338-18 ADC at www.linear.com/product/LTC2338

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