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
