The addition of the sequencer provides the ability to mix and match fully differential and pseudo-differential input ranges with a variety of 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 100dB 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 ksamples/sec and 1 Msamples/sec, that achieve 100dB SNR at 18 bits, and 96dB SNR at 16 bits, with the ±4.096V 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 25 mm² QFN-32 package. The device is powered from a single 5V supply and consumes only 40 mW at 1 Msamples/sec.
In commercial, industrial and automotive (-40°C to 125°C) temperature grades, pricing begins at $17.35 (1,000). The DC2071A evaluation board for the LTC2373 SAR ADC family is available at www.linear.com/demo
Linear Technology; www.linear.com/product/LTC2373-18