Fast 16-bit octal SAR ADC with wide input bandwidth

December 15, 2016 // By Graham Prophet
LTC2320-16 is a 16-bit 1.5 Msample/sec per channel, no-latency successive approximation register (SAR) ADC with eight simultaneously sampling channels supporting a rail-to-rail input common mode range, that maintains AC performance up to the Nyquist frequency.

It has a flexible analogue front end that accepts fully differential, unipolar or bipolar analogue input signals, as well as arbitrary input signals, and maintains an 82 dB signal-to-noise ratio (SNR) and high common mode rejection ratio (CMRR) of 102 dB, when sampling input signals up to the Nyquist frequency. This wide input bandwidth of the LTC2320 allows the digitization of input signals up to the Nyquist frequency of 750 kHz.

 

The LTC2320-16 integrates a precision bandgap reference with low drift and guaranteed 20 ppm/ºC maximum temperature coefficient into a 55 mm² QFN-52 package, saving space in high density designs. Alternatively, the internal reference can be overdriven by up to four separate external references for each pair of two channels, to match the input range of the application. The LTC2320-16 samples three times faster and offers the lowest power dissipation of any octal SAR ADC on the market.

 

In commercial, industrial and automotive (–40°C to 125°C) temperature grades, pricing begins at $16.50 (1,000). The DC2395A evaluation board for the LTC2320 SAR ADC family is available at www.linear.com/demo

 

Linear Technology; www.linear.com/product/LTC2320-16

 

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