Analog Devices LTC2348-18 | Demoboard DC2094A-A

Description

Demonstration circuit 2094A shows the proper way to drivethe LTC®2348 family of ADCs. The LTC2348/LTC2347/LTC2343 are low noise, high speed, simultaneous sampling16-/18-bit successive approximation register (SAR) ADCs.The following text refers to the LTC2348-18 but appliesto all parts in the family, the only differences being thenumber of bits, number of channels and the maximumsample rate. The LTC2348-18 has a flexible SoftSpan™interface that allows conversion-by-conversion control ofthe input voltage span on a per-channel basis. An internal2.048V reference and 2X buffer simplify basic operationwhile an external reference can be used to increase theinput range and the SNR of the ADC.The DC2094 demonstrates the DC and AC performance ofthe LTC2348-18 in conjunction with the DC590/DC2026 andDC890 data collection boards. Use the DC590/DC2026 todemonstrate DC performance such as peak-to-peak noiseand DC linearity. Use the DC890 if precise sampling ratesare required or to demonstrate AC performance such asSNR, THD, SINAD and SFDR. The DC2094 is intendedto demonstrate recommended grounding, componentplacement and selection, routing and bypassing for thisADC. A suggested driver circuit for the analog inputs isalso presented.

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