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Pseudo-Differential Serial SAR ADC with 96.5 dB SNR Performance & 18 mW Power

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A serial 18-bit, 1.6 Msample/s pseudo-differential SAR analog-to-digital converter (ADC) achieves 96.5 dB SNR and -120 dB THD while supporting a 0V to 5V unipolar input range. The  LTC2369-18 from Linear Technology with its pseudo-differential input simplifies the ADC driver requirement, enabling single-ended drive while benefiting from the reduction of unwanted signals common to both inputs. This reduces complexity and lowers the power requirements in the signal chain. 

Operating from a 2.5V supply, the LTC2369-18 consumes only 18 mW, with a low power shutdown mode that consumes just 2.25 µW. When used in combination with the recommended single-ended ADC driver LT6202, the combined power dissipation is a mere 53 mW, a 40% reduction from a fully differential drive circuit. The LTC2369-18 is the industry’s highest performing 18-bit pseudo-differential SAR ADC, featuring a maximum INL of ±2.5 LSB with no missing codes and guaranteed specifications over the -40°C to 125°C temperature range. 

Linear Technology, Milpitas, CA. (408) 432-1900. [www.linear.com].