Linear Technology Corp. has introduced the LTC2373-18, an 8-channel, 18-bit, 1-MS/s successive-approximation-register (SAR) ADC with 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 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 kS/s and 1 MS/s, 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 5-V supply and consumes only 40 mW at 1 MS/s.
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. The DC2071A evaluation board for the LTC2373 SAR ADC family is available at www.linear.com/demo or via a local Linear Technology sales office.
