14-bit, 6 Msps sampling ADC

26 March 2003 Analogue, Mixed Signal, LSI

Linear Technology's LTC1740 is a 6 Msps, 14-bit sampling A/D converter that draws only 245 mW from either a single 5 V or dual ±5 V supplies. This device includes a high dynamic range sample-and-hold and a programmable precision reference. The LTC1740 has a flexible input circuit that allows differential full-scale input ranges of ±2,5 V and ±1,25 V with the internal reference, or any full-scale input range up to ±2,5 V with an external reference. The input common mode voltage is arbitrary, though a 2,5 V reference is provided for single supply applications.

Typical DC specs include 1LSB INL and 0,5LSB DNL. The DNL is guaranteed to be better than ±1LSB over temperature. Superior AC performance includes 79 dB S/(N + D) and 91 dB SFDR at an input frequency of 2,5 MHz.

Its unique differential input sample-and-hold can acquire single-ended or differential input signals up to its 80 MHz bandwidth. The 75 dB common mode rejection allows users to eliminate ground loops and common mode noise by measuring signals differentially from the source. A separate output logic supply allows direct connection to 3 V components. Comes in 36-pin SSOP package.

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