DDC232 Datasheet | Texas Instruments

FEATURES - 2 Single-Chip Solution to Directly Measure 32 Low-Level Currents - High-Precision, True Integrating Function - Integral Linearity: ±0.025% of Reading ±1.0ppm of FSR - Very Low Noise: 5.3ppm of FSR - Low Power: 7m W/channel - Adjustable Full-Scale Range - Adjustable Speed - Data Rate up to 6k SPS - Integration Times as low as 166.5ms - Daisy-Chainable Serial Interface - In-Package Bypass Capacitors Simplify PCB Design APPLICATIONS - CT Scanner DAS - Photodiode Sensors - X-Ray Detection Systems The DDC232 uses a +5V analog supply and a +2.7V to +3.6V digital supply. Operating over the temperature range of 0°C to +70°C, the DDC232 BGA-64 package is offered in two versions: the DDC232C for low-power applications, and the DDC232CK when higher speeds are required. AVDD VREF DVDD 0.1m F 0.1m F 0.1m F IN1 Dual Switched Integrator IN2 Dual Switched Integrator IN3 Dual Switched Integrator IN4 Dual Switched Integrator DS ADC DS ADC Configuration and Control CLK CONV DIN_CFG CLK_CFG RESET DVALID DESCRIPTION The DDC232 is a 20-bit, 32-channel, current-input analog-to-digital (A/D) converter. It bines both current-to-voltage and A/D conversion so that 32 separate low-level current output devices, such as photodiodes, can be directly connected to its inputs and digitized. For each of the 32 inputs, the DDC232 provides a dual-switched integrator front-end. This configuration 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 integration times range from 166ms to 1s, allowing currents from f As to m As to be continuously measured with outstanding...