3V 140ksps 12-Bit Sampling A/D Converter with Reference

The LTC1282 is a 6µs, 140ksps, sampling 12-bit A/D converter that draws only 12mW from a single 3V or dual ±3V supply. This easy-to-use device comes complete with 1.14µs sample-and-hold, precision reference and internally trimmed clock. Unipolar and bipolar conversion modes provide flexibility for various applications. They are built with LTBiCMOS™ switched capacitor technology.

The LTC1282 has a 25ppm/°C (max) internal reference and converts 0V to 2.5V unipolar inputs from a single 3V supply. With ±3V supplies its input range is ±1.25V with two’s complement output format. Maximum DC specifications include ±0.5LSB INL, ±0.75LSB DNL and 25ppm/°C full-scale drift over temperature. Outstanding AC performance includes 69dB S/(N + D) and 77dB THD at the Nyquist input frequency of 70kHz.

The internal clock is trimmed for 6µs maximum conversion time. The clock automatically synchronizes to each sample command eliminating problems with asynchronous clock noise found in competitive devices. A high speed parallel interface eases connections to FIFOs, DSPs and microprocessors.

Applications

* 3V Powered Systems

* High Speed Data Acquisition

* Digital Signal Processing

* Multiplexed Data Acquisition Systems

* Audio and Telecom Processing

* Spectrum Analysis

* Single Supply 3V or ±3V Operation

* 140ksps Throughput Rate

* 12mW (Typ) Power Dissipation

* On-Chip 25ppm/°C Reference

* Internal Synchronized Clock; No Clock Required

* High Impedance Analog Input

* 69dB S/(N + D) and 77dB THD at Nyquist

* ±0.5LSB INL and ±0.75LSB DNL Max (A Grade)

* 2.7V Guaranteed Minimum Supply Voltage

* ESD Protected On All Pins

* 24-Pin Narrow PDIP and SW Packages

* 0V to 2.5V or ±1.25V Input Ranges