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SAR ADCs offer I/O voltages from 1.8-5V

Posted: 16 Nov 2011 ?? ?Print Version ?Bookmark and Share

Keywords:SAR ADC? pseudo-differential input? power dissipation?

Linear Technology Corp. has released a serial 18bit 1.6Msps pseudo-differential SAR ADC that delivers 96.5dB SNR and -120dB THD while supporting 0-5V unipolar input range. According to the company, the LTC2369-18 is the industry's highest performing ADC that features a maximum INL of 2.5LSB without missing codes and guaranteed specifications from -40C to 125C.

The pseudo-differential input simplifies the ADC driver requirement, enabling single-ended drive while gaining from the reduction of unwanted signals common to both inputs, said Linear Tech. This cuts complexity and lowers the power requirements in the signal chain. Operating from a 2.5V supply, the LTC2369-18 consumes only 18mW, with a low power shutdown mode that consumes 2.25?W, added the company. When used in combination with the recommended single-ended ADC driver LT6202, the combined power dissipation is a mere 53mW, a 40 percent reduction from a fully differential drive circuit.

Complementing the LTC2369-18 is the pin- and software-compatible 16bit, 2Msps LTC2370-16. The LTC2370-16 achieves 94dB SNR and 0.85LSB maximum INL.

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The 18bit no-latency pseudo-differential SAR ADC delivers 1.6Msps throughput and 96.5dB SNR.

The devices offer a user-friendly SPI interface, explicit Busy and Chain pins, I/O voltages from 1.8-5V and an internal oscillator that simplifies digital timing and minimizes external component count. Their true no-latency operation enables accurate one-shot measurements even after lengthy idle periods with no minimum sample rate required, revealed Linear Tech.

Linear Tech's ADCs with high SNR, fast throughput and low power dissipation make them ideal for medical, industrial and automotive applications, said the company. The LTC2369-18 and LTC2370-16 are available in small 16-lead MSOP and 4 x 3mm DFN packages, and are priced at $29.95 and $24.50 each, respectively, in 1,000 piece quantities.

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