DDC112UK/1KG4

Analog To Digital Converters (ADC) Overview

The DDC112UKG4 is a dual-channel, 20-bit analog-to-digital converter (ADC) designed for monolithic charge measurement. It features two independent current inputs with continuous integration capabilities using paired integrators per channel. The device operates on a single +5V supply and provides a cascadable serial output interface. Key electrical specifications include a maximum integral linearity error of ±0.025% of reading plus 1.0 ppm of full-scale range (FSR). Noise performance is specified at 3.2 ppm rms for low-level current inputs with zero sensor capacitance. The component is housed in a 28-lead SOIC package and is rated for an operating temperature range of 0°C to +70°C.

Analog To Digital Converters (ADC) Feature Summary

• Dual input channels with continuous charge integration using alternating A/B integrator pairs
• 20-bit resolution with programmable full-scale ranges from external capacitors up to 1000 pC or internal ranges up to 350 pC
• Cascadable high-speed serial shift register for multi-device daisy-chaining
• Low noise digital filter reducing noise to 3.2 ppm rms under optimal conditions

Analog To Digital Converters (ADC) Applications

• Direct photosensor digitization
• Computed Tomography (CT) scanner data acquisition systems
• Infrared pyrometer control
• Precision process analysis and control
• Liquid/gas chromatography
• Blood analysis instrumentation

Analog To Digital Converters (ADC) Procurement Notes

Verify the ordering suffix 'G4' indicates lead-free compliance and RoHS conformity as per Texas Instruments standards. Confirm the 'U' designator corresponds to the SOIC-28 package variant. Ensure the 'K' suffix aligns with the specified commercial temperature grade (0°C to +70°C) rather than the industrial grade (-40°C to +85°C). Cross-reference the specific revision level in the manufacturer's datasheet to ensure pinout and electrical characteristics match the design requirements.

Analog To Digital Converters (ADC) Selection Notes

Select this component when interfacing low-level current sources such as photodiodes that require direct charge integration without external transimpedance amplifiers. Choose the DDC112UKG4 over the DDC112U variant if the application environment is restricted to commercial temperatures (0°C to +70°C). Utilize external integration capacitors connected to pins CAP1A/B and CAP2A/B if the required dynamic range exceeds the internal maximum of 350 pC. Ensure the system clock frequency does not exceed 15 MHz for the UK variant.

Analog To Digital Converters (ADC) Part Context

The DDC112 belongs to the Burr-Brown family of precision data converters acquired by Texas Instruments. It is specifically engineered for applications requiring wide dynamic range and high precision in measuring small currents or charges. The device integrates the front-end analog functions of current-to-voltage conversion and integration with a delta-sigma modulator and digital filter, simplifying the system architecture for high-performance sensing applications.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify compatibility with any alternative ADCs regarding pinout, voltage reference requirements, and serial interface timing.