DDC118

ACTIVE

Octal Current-Input 20-Bit Analog-to-Digital Converter

Product details

Number of input channels 8 Resolution (bps) 20 Features Computed Tomography (CT) Operating temperature range (°C) -40 to 85 Interface type Serial Rating Catalog
Number of input channels 8 Resolution (bps) 20 Features Computed Tomography (CT) Operating temperature range (°C) -40 to 85 Interface type Serial Rating Catalog
VQFNP (RTC) 48 49 mm² 7 x 7
  • 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

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

  • 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

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

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.

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 DDC118 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-DDC118 system is minimal.

The DDC118 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 DDC118 is offered in a QFN-48 package.

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.

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 DDC118 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-DDC118 system is minimal.

The DDC118 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 DDC118 is offered in a QFN-48 package.

Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 3
Type Title Date
* Data sheet Octal Current Input, 20-Bit Analog-to-Digital Converter datasheet (Rev. B) 01 Apr 2009
Analog Design Journal Selecting a multichannel ultra-low-current measurement IC PDF | HTML 18 Mar 2022
EVM User's guide DDC11xEVM-PDK User's Guide (Rev. A) 09 Jul 2010

Design & development

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

Simulation model

DDC118 IBIS Model

SBAM148.ZIP (43 KB) - IBIS Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Package Pins CAD symbols, footprints & 3D models
VQFNP (RTC) 48 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos