Texas Instruments DEM-DDC112U-C

Overview

DEM-DDC112U-C from Burr-Brown Corporation is an evaluation fixture designed specifically for the DDC112 precision dual-channel integrating analog-to-digital converter. It comprises a PC interface board (A2273), DUT board (A2326), 3.5" software diskette, two ribbon cables (25-pin and 34-pin), and documentation. It enables full performance characterization including SNR, SNDR, SFDR, FFT analysis, and oscilloscope-like time-domain display of up to 32,768 data points.

For engineers reviewing the DEM-DDC112U-C datasheet, DEM-DDC112U-C pinout, DEM-DDC112U-C application, or DEM-DDC112U-C equivalent, this kit supports rapid validation of DDC112-based sensor signal chains in precision metrology, photodiode readout, and low-frequency charge-digitizing systems - with keyboard/mouse control, parallel-port connectivity, and on-screen spectral analysis.

Technical Context

The DEM-DDC112U-C implements a two-board architecture: a noise-isolated DUT board hosting the DDC112U socket, 4.096V LM4040-based reference, configurable input networks (Z2–Z7), and external gain capacitor sockets (C9–C12); and a PC interface board providing parallel-port communication, 32,768-word data buffer, timing register control, and CONV/data clock management via U7 (20MHz oscillator).

It supports user-configurable integration times down to 0.1µs, seven internal gain settings (12.5–250pC full-scale), and optional external gain capacitors. Data retrieval operates at up to 10MHz data clock rate, with automatic fundamental frequency detection and real-time calculation of SNR (≥100dB typical), SNDR, and SFDR - all executed by PC-hosted software without embedded processing.

Key Specifications

Availability

DEM-DDC112U-C is available at Aetrix Electronics and suitable for precision sensor evaluation, photodiode signal chain validation, and metrology-grade ADC qualification requiring stable component supply and legacy test infrastructure compatibility.

Supply support for DEM-DDC112U-C includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Burr-Brown Corporation was a U.S.-based analog semiconductor company founded in 1956 and acquired by Texas Instruments in 2000. It specialized in high-precision data converters, amplifiers, and interface ICs for test & measurement and industrial sensing.

The DEM-DDC112U-C belongs to Burr-Brown's DDC112 evaluation platform family, engineered to accelerate design-in of charge-digitizing ADCs in ultra-low-noise, wide-dynamic-range applications such as scientific instrumentation and optical sensor interfaces.

FAQ

What is the DEM-DDC112U-C used for?

The DEM-DDC112U-C is an evaluation fixture for the DDC112 precision integrating ADC. It enables engineers to characterize dynamic performance metrics - including SNR, SNDR, SFDR, and FFT spectra - directly from a DOS-based PC using parallel-port control. The DEM-DDC112U-C includes hardware (PC interface board, DUT board, cables) and software to validate DDC112 behavior under real-world sensor input conditions.

Does the DEM-DDC112U-C require a specific PC configuration?

Yes - the DEM-DDC112U-C requires an IBM-compatible PC with EGA/VGA graphics, a parallel port (LPT1), and DOS 3.3 or later. It does not support Windows-native execution; running in Windows environments requires closing other applications. Power must be +5VDC at ≤300mA, and a laser printer (e.g., HP LaserJet) is recommended for hard copy output of time/FFT plots generated by the DEM-DDC112U-C software.

Can the DEM-DDC112U-C evaluate multiple DDC112 devices simultaneously?

The DEM-DDC112U-C software supports configuration for up to multiple DDC112 units via the Data Transfer menu, but the included DUT board (A2326) hosts only one DDC112 socket. Evaluating more than one device requires building a custom DUT board - the DEM-DDC112U-C hardware itself is single-DUT by design, though its firmware and interface logic accommodate multi-device serial readout.

What reference voltage does the DEM-DDC112U-C use, and can it be changed?

The DEM-DDC112U-C uses a factory-installed 4.096V LM4040 reference buffered through an op-amp and filtered with a 3.157Hz low-pass network. JP1 allows reconfiguration to accept an external reference via coax connector P5 or a user-designed circuit on the analog breadboard area - enabling validation of alternate reference topologies while preserving DDC112U accuracy requirements.

Is the DEM-DDC112U-C still supported or available from Texas Instruments?

No - Texas Instruments discontinued active support and distribution of the DEM-DDC112U-C after acquiring Burr-Brown. Original documentation (LI-500A), software (v2.1), and schematics are archived but not maintained. Aetrix Electronics provides verified legacy stock with full traceability, making the DEM-DDC112U-C accessible for ongoing DDC112-based system maintenance and calibration workflows.