18 Bit, 1Msps, 8-Channel Multiplexed SAR ADC with Sequencer Combines Performance, Compatibility

Linear Technology Corporation introduces the LTC2373-18, an 8-channel, 18-bit, 1Msps successive approximation register (SAR) ADC with exceptional 100 dB SNR performance. The LTC2373-18 is equipped with a programmable sequencer that can store up to 16 control words for configuring the multiplexer (MUX) and input range. This provides the ability to easily mix and match fully differential and pseudo-differential input ranges with various MUX channel configurations. Single-ended input signals may also be converted to the fully differential input range of the ADC core by sharing a single external driver circuit between the MUXOUT/ADCIN pins available on the device. This enables the user to achieve the full 100 dB SNR performance of the ADC on eight single-ended inputs.

The LTC2373-18 leads a family of 16-/18-bit 8-channel multiplexed SAR ADCs that communicate over SPI-compatible interfaces, feature sample rates of 500 ksps and 1 Msps, and achieve 100 dB SNR at 18 bits, and 96 dB SNR at 16 bits with the ±4.096 V fully differential input range. The LTC2373 family integrates a precision bandgap reference with low drift and guaranteed 20 ppm/°C maximum temperature coefficient and a high performance reference buffer into a small 25 mm² QFN-32 package. The device is powered from a single 5V supply and consumes only 40 mW at 1Msps.

The LTC2373-18 is available today in commercial, industrial and automotive (-40 °C to 125 °C) temperature grades. Pricing begins at $17.35 each in 1,000-piece quantities.