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Maxim touts smallest SAR ADC, saves 70% board space

Posted: 15 May 2013     Print Version  Bookmark and Share

Keywords:MAX11156  SAR ADC  Beyond-the-Rails technology  Maxim 

Maxim Integrated Products Inc. has released what it claims as the smallest 12-pin, 18bit successive approximation register (SAR) analogue-to-digital converter (ADC). The MAX11156 comes in a tiny 3 x 3mm TDFN package and integrates an internal reference and reference buffer, saving cost and at least 70 per cent board space over competing solutions, the company said.

With 18bit resolution, this high-performance ADC features Beyond-the-Rails technology, which supports a ±5V input from a single positive 5V input rail. This technology eliminates the need for negative power supplies and simplifies designs. With 18bit resolution and a 500ksps sampling rate, the MAX11156 is ideal for automatic test equipment (ATE), industrial control systems, medical instrumentation, and robotics, where high accuracy and tiny size are paramount.

Due to its monotonic transfer characteristic, fast settling time, and lack of latency, Maxim noted that the MAX11156 is ideal for fast, high-precision digital control-loop systems. In fact, the MAX11156 provides 18bit resolution with no missing codes; excellent DC accuracy (0.5 LSB DNL and 2.5 LSB INL (typ)); and excellent AC performance (94.6dB SNR and -105dB THD (typ)). Additionally, the MAX11156 communicates using a SPI-compatible serial interface, which can be used to daisy-chain multiple ADCs in parallel for multi-channel applications. This interface can also provide a busy indicator to simplify system synchronisation and timing.

Key Advantages

  • Reduced board space: industry's smallest 18bit SAR ADC integrates a reference buffer and internal reference, which saves cost and simplifies designs
  • Improved performance: the 18bit performance produces 94.6dB SNR, -105dB THD (typ), and guarantees no missing codes
  • Bipolar input range: measures a ±5V (10VP-P) input range while operating from a single 5V supply; simplifies external signal conditioning
Pricing starts at Rs.879.89 ($16.90) (1000-up, FOB USA).

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