DDC118IRTCR Datasheet PDF - Burr Brown

●DESCRIPTION

●The DDC118 is a 20-bit octal channel, current-input analog-to-digital (A/D) converter. It combines both current-to-voltage and A/D conversion so that eight low-level current output devices, such as photodiodes, can be directly connected to its inputs and digitized.

●For each of the eight inputs, the DDC118 provides a dual-switched integrator front-end. This design allows for continuous current integration: while one integrator is being digitized by the onboard A/D converter, the other is integrating the input current. Adjustable full-scale ranges from 12pC to 350pC and adjustable integration times from 50µs to 1s allow currents from fAs to µAs to be measured with outstanding precision. Low-level linearity is ±0.5ppm of the full-scale range and noise is 5.2ppm of the full-scale range.

●FEATURES

●• SINGLE-CHIP SOLUTION TO DIRECTLY MEASURE EIGHT LOW-LEVEL CURRENTS

●• HIGH PRECISION, TRUE INTEGRATING FUNCTION

●• INTEGRAL LINEARITY:

●   ±0.01% of Reading ±0.5ppm of FSR

●• VERY LOW NOISE: 5.2ppm of FSR

●• LOW POWER: 13.5mW/channel

●• ADJUSTABLE DATA RATE: Up to 3.125kSPS

●• PROGRAMMABLE FULL SCALE

●• DAISY-CHAINABLE SERIAL INTERFACE

●APPLICATIONS

●• CT SCANNER DAS

●• PHOTODIODE SENSORS

●• INFRARED PYROMETER

●• LIQUID/GAS CHROMATOGRAPHY