Mixed Signal/Analog

SAR ADCs feature flexible differential inputs

25th February 2014
Nat Bowers

Featuring flexible differential inputs, the LTC2323-16 is a dual 16-bit simultaneous sampling, successive approximation register (SAR) ADC from Linear Technology. This device leads a family of 16-, 14- and 12-bit SAR ADCs, featuring sample rates of 5Ms/s and 2Ms/s while achieving 81dB SNR at 16-bits, 80dB SNR at 14-bits and 73dB SNR at 12-bits.

The 14- and 12-bit versions feature sign plus magnitude transfer functions. This makes them suited for use in control loop applications. The LTC2323-16 supports a wide input common mode range and simplifies system-level design by relaxing the signal conditioning requirements to drive the ADC with a wide range of analogue signals up to Nyquist frequencies.

The LTC2323 family can be powered from a 3.3 or 5V supply and consumes just 55mW with a 3.3V supply and 80mW with a 5V supply. The high speed SPI-compatible CMOS or LVDS serial interface is suitable for highly integrated high speed systems. The ADCs integrate a precision bandgap reference with low drift and guaranteed 20ppm/°C maximum temperature coefficient into a small package.

Available in commercial, industrial and automotive temperature grades (operating from -40 to +125°C), the LTC2323-16 is supplied in a small 28-lead 4×5mm QFN package. Pricing begins at $13.95 each in 1,000 unit quantities. Linear Technology also offers the DC1996A evaluation board for the SAR ADC family.

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