Pseudo-differential serial SAR ADC achieves 96.5-dB SNR
November 08, 2011 // Paul Buckley
Linear Technology has introduced the LTC2369-18, a serial 18-bit, 1.6 Msps pseudo-differential SAR analog-to-digital converter, which achieves 96.5 dB SNR and -120 dB THD while supporting a 0 V to 5 V unipolar input range. The pseudo-differential input simplifies the ADC driver requirement, enabling single-ended drive while benefiting from the reduction of unwanted signals common to both inputs.
The input reduces complexity and lowers the power requirements in the signal chain. Operating from a 2.5 V supply, the LTC2369-18 consumes 18 mW, with a low power shutdown mode that consumes 2.25 µW. When used in combination with the recommended single-ended ADC driver LT6202, the combined power dissipation is 53 mW, a 40% reduction from a fully differential drive circuit. The LTC2369-18 claims to be 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 to 125°C temperature range.
Complementing the LTC2369-18 is the pin- and software-compatible 16-bit, 2 Msps LTC2370-16. The LTC2370-16 achieves outstanding 94 dB SNR and ±0.85 LSB maximum INL. The LTC2369-18 and LTC2370-16 are the first in a family of 18-/16-bit high performance pseudo-differential SAR ADCs with speeds ranging from 250 ksps to 2 Msps. They offer a user-friendly SPI interface, explicit Busy and Chain pins, I/O voltages from 1.8 V to 5 V 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.
The LTC2369-18 family of 18-/16-bit pseudo-differential SAR ADCs broadens the LTC2379-18 family of up to 102 dB SNR, fully differential SAR ADCs introduced earlier in 2011. Linear’s complete portfolio of high performance pseudo and fully differential 18-/16-bit SAR ADCs with high SNR, fast throughput and low power dissipation is ideal for high performance medical, industrial and automotive applications.
The LTC2369-18 and LTC2370-16 are available in small 16-lead MSOP and 4 mm x 3 mm DFN packages.
For further information: www.linear.com/product/LTC2369.
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Internet of Things (IoT) manufacturer Ciseco has launched the Raspberry Pi ‘Wireless Inventors Kit’ (RasWIK), featuring 88 pieces to provide everything a Pi owner needs to follow a series of step-by-step projects or to create their own wireless devices, without the need for configuration or even writing code.
RasWIK has been designed to be highly accessible, demystifying the dark art of wireless and enabling anyone with basic computing skills to begin building wireless devices with a Raspberry Pi. You can create anything from a simple traffic light, to a battery monitor, or even a temperature gauge that sends data to the Xively IoT cloud so billions can access the data.This month, Ciseco is giving away twelve Raspberry Pi Wireless Inventors kits, worth £49.99 each for EETimes Europe's readers to win.
And the winners are...
In our previous reader offer, Farsens was giving away five kits for EEtimes Europe readers to evaluate its FenixVortex, Kineo and X1 wireless, battery free sensor tags.
Lucky winners include Mr A. Neil from the UK, Mr. E. Delvaux from Belgium, Mr Lengal from the Czech Republic, Mr H. Bijlsma from the Netherlands, and Mr G. Pfaff from Germany. All should be receiving their packages soon. Lets wish them some interesting findings with their projects.
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