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Product details

Parameters

Number of input channels 4 Resolution (Bits) 20 Features Computed Tomography (CT) Operating temperature range (C) -40 to 85 Interface type Serial open-in-new Find other Computer tomography (CT) AFEs

Package | Pins | Size

VQFNP (RTC) 48 49 mm² 7 x 7 open-in-new Find other Computer tomography (CT) AFEs

Features

  • SINGLE-CHIP SOLUTION TO DIRECTLY MEASURE FOUR 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

Protected by US Patent #5841310
All trademarks are the property of their respective owners.

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Description

The DDC114 is a 20-bit quad channel, current-input analog-to-digital (A/D) converter. It combines both current-to-voltage and A/D conversion so that four low-level current output devices, such as photodiodes, can be directly connected to its inputs and digitized.

For each of the four inputs, the DDC114 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.

Two modes of operation are provided. In Low-Power mode, total power dissipation is only 13.5mW per channel with a maximum data rate of 2.5kSPS. High-Speed mode supports data rates up to 3.125kSPS with a corresponding dissipation of 18mW per channel.

The DDC114 has a serial interface designed for daisy-chaining in multi-device systems. Simply connect the output of one device to the input of the next to create the chain. Common clocking feeds all the devices in the chain so that the digital overhead in a multi-DDC114 system is minimal.

The DDC114 is a single-supply device using a +5V analog supply and supporting a +2.7V to +5.25V digital supply. Operating over the industrial temperature range of -40°C to 85°C, the DDC114 is offered in a QFN-48 package.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 7
Type Title Date
* Datasheet Quad Current Input, 20-Bit Analog-To-Digital Converter datasheet (Rev. C) Apr. 01, 2009
Technical articles Offset correction improves the next generation of heart-rate smart watches Aug. 24, 2015
Technical articles A new way to illuminate the human condition Dec. 30, 2013
Technical articles Oximeter signaling: There’s more than meets the eye Dec. 04, 2013
Technical articles Virtual hospital implementation using a worn health monitor Nov. 13, 2013
User guides DDC11xEVM-PDK User's Guide (Rev. A) Jul. 09, 2010
More literature DDC11xEVM Readme Page Thank You Letter Nov. 07, 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
499
Description

The DDC11xEVM-PDK provides an easy-to-use platform for evaluating the DDC112 or DDC114 charge digitizing A/D converters. A PC interface board (DDCMB) and daughter boards for the DDC112 or DDC114 are included along with software that makes analysis and testing of these devices manageable.

Features
  • The DDC112 is a wide range, charge digitizing A/D converter with 20-bit resolution
  • Low-level current output devices, such as photo sensors, can be directly connected to the DDC112 input.
  • The DDC112 combines current-to-voltage conversion, integration, and digital filtering to produce wide range of (...)

Design tools & simulation

SIMULATION MODELS Download
SBAM150.ZIP (43 KB) - IBIS Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
VQFN (RTC) 48 View options

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