LTC1277 Datasheet | Linear Technology

LTC1274/LTC1277 12-Bit, 10m W, 100ksps ADCs with 1µ A Shutdown Features s s s DESCRIPTIO s s s s s s s Low Power Dissipation: 10m W Sample Rate: 100ksps Samples Inputs Beyond Nyquist, 72d B S/(N + D) and 82d B THD at f IN = 100k Hz Single Supply 5V or ± 5V Operation Power Shutdown to 1µA in Sleep Mode 180µA Nap Mode (LTC1277) with Instant Wake-Up Internal Reference Can Be Overdriven Internal Synchronized Clock 0V to 4.096V or ± 2.048V Input Ranges (1m V/LSB) 24-Lead SO Package The LTC ®1274/LTC1277 are 8µs sampling 12-bit A/D converters which draw only 2m A (typ) from single 5V or ± 5V supplies. These easy-to-use devices e plete with a 2µs sample-and-hold, a precision reference and an internally trimmed clock. Unipolar and bipolar conversion modes add to the flexibility of the ADCs. Two power-down modes are available in the LTC1277. In Nap mode, the LTC1277 draws only 180µA and the instant wake-up from Nap mode allows the LTC1277 to be powered down even during brief inactive periods. In Sleep mode only 1µA will be drawn. A REFRDY signal is used to show the ADC is ready to sample after waking up from Sleep mode. The LTC1274 also provides the Sleep mode and REFRDY signal. The A/D converters convert 0V to 4.096V unipolar inputs from a single 5V supply or ± 2.048V bipolar inputs from ± 5V supplies. The LTC1274 has a single-ended input and a 12-bit parallel data format. The LTC1277 offers a differential input and a 2-byte read format. The bipolar mode is formatted as 2’s plement for the LTC1274 and offset binary for the LTC1277. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATI s s s s s s Battery-Powered Portable Systems High Speed Data Acquisition for PCs Digital Signal Processing Multiplexed Data Acquisition Systems Audio and Tele Processing Spectrum Analysis TYPICAL APPLICATI Single 5V Supply, 10m W, 100k Hz, 12-Bit ADC LTC1277 ANALOG 1 AIN+ DIFFERENTIAL INPUTS 2 AIN- (0V TO 4.096V) 3 2.42V VREF VREF OUTPUT + 4 AGND 0.1...