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Linear's 18bit SAR ADC achieves 99.8dB SNR

Posted: 17 Apr 2012     Print Version  Bookmark and Share

Keywords:SAR  ADC  SNR 

Linear Technology Corp. debuts the LTC2389-18, claimed as the industry's fastest 18bit no cycle latency SAR analogue-to-digital converter (ADC) that is said to achieve unrivalled 99.8dB SNR and -116dB THD at sample rates up to 2.5Msps.

Operating from a single 5V supply, the LTC2389-18 supports three pin-configurable analogue input ranges, easily interfacing to multiple signal chains with a single device. For the highest SNR performance, the LTC2389-18 can be configured for fully differential (±4.096V) inputs, according to Linear.

The pseudo-differential unipolar (0V to 4.096V) and bipolar (±2.048V) analogue input ranges enable lower power single-ended drive and benefit from the reduction of unwanted signals common to both inputs. The LTC2389-18 is targeted at demanding designs that require maximum signal swings at low power levels in noisy industrial environments.

The LTC2389-18 features equally impressive DC performance, featuring ±3LSB INL (max), ±10LSB offset error and 18bits no missing codes resolution, noted the company. The LTC2389-18 also features a 4.096V precision internal reference with a 20ppm/°C (max) temperature coefficient, providing space savings for high density designs. The LTC2389-18 dissipates 162.5mW at 2.5Msps and features a shutdown mode that reduces power dissipation to 75µW when not converting. The true no latency operation enables accurate one shot measurements even after lengthy idle periods with no minimum sample rate requirement. The LTC2389-18 provides a flexible digital interface supporting 2.5Msps throughput with parallel interface and 1.9Msps throughput with serial SPI interface at I/O voltages from 1.8V to 5V.

A 16bit 2.5Msps pin- and software compatible version LTC2389-16 with exceptional 96dB SNR and ±0.75LSB INL performance is also planned to be released following the LTC2389-18. Specifications are guaranteed over the -40�C to 125�C temperature range and the devices are available in 48-pin 7mm×7mm LQFP and QFN packages.

The LTC2389-16 and LTC2389-18 are priced respectively at Rs.1,500.50 ($30.31) and Rs.1,678.22 ($33.90) each in 1,000 piece quantities. The DC1826A, the associated demonstration board to evaluate the LTC2389-18 and LTC2389-16, is available at or via a local Linear Technology sales office.

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