Product details


Number of input channels 128 Resolution (Bits) 20 Features Computed Tomography (CT) Operating temperature range (C) 0 to 70 Interface type Serial open-in-new Find other Computer tomography (CT) AFEs

Package | Pins | Size

NFBGA (ZKL) 192 81 mm² 9 x 9 open-in-new Find other Computer tomography (CT) AFEs


  • Single-Chip Solution to Directly Measure
    128 Low-Level Currents
  • Proven High-Precision, True Integrating
    Architecture with 100% Charge Collection
  • Easy Upgrade for Existing DDC Family
  • Low Power: 3 mW/channel at 3 kSPS
  • Extremely Linear:
    INL = ±0.025% of Reading ±1 ppm of FSR
  • Low Noise: 6.3 ppm of FSR
  • Adjustable Full-Scale Range
  • Adjustable Speed
    • Data Rates up to 6 kSPS with 20-bit
    • Integration Times as low as 160 µs
  • Daisy-Chainable Serial Interface
  • In-Package Bypass Capacitors Simplify PCB
    Design Area and Design Complexity
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The DDC1128 is a 20-bit, 128-channel, current-input analog-to-digital (A/D) converter. It combines both current-to-voltage and A/D conversion so that 128 separate low-level current output devices, such as photodiodes, can be directly connected to its inputs and digitized.

For each of the 128 inputs, the DDC1128 uses the proven 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. This architecture provides both a stable offset and a loss-less collection of the input current. Adjustable integration times range from 160µs to 1s, allowing currents from fAs to µAs to be continuously measured with outstanding precision.

The DDC1128 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-DDC1128 system is minimal.

The DDC1128 operates from a +5 V analog supply and a 2.7 V to 3.6 V digital supply, it is specified from 0°C to 70°C operating temperature and it is available in a 9 × 9 mm2 192-ball BGA, which includes on board bypass capacitors to help minimize the external component requirements and further reduce board space.

To request a full data sheet or other design resources: request DDC1128

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More Information

Full data sheet and other design resources are available under NDA. Request now

Technical documentation

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Type Title Date
* Data sheet DDC1128 128-Channel, Current-Input Analog-to-Digital Converter datasheet (Rev. A) May 27, 2016
Technical article Offset correction improves the next generation of heart-rate smart watches Aug. 24, 2015
User guide DDC1128 EVM Intro User's Guide Mar. 19, 2014
Technical article A new way to illuminate the human condition Dec. 30, 2013
Technical article Oximeter signaling: There’s more than meets the eye Dec. 04, 2013
Technical article Virtual hospital implementation using a worn health monitor Nov. 13, 2013

Design & development

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

Hardware development

document-generic User guide

The DDC1128EVM evaluation module  (EVM)  is  an  evaluation  kit  for  evaluating  the DDC1128,  a  128-channel,  current  input,  20-bit analog-to-digital (A/D) converter. The EVM consists of two DDC1128 devices, a USB device for interfacing to a PC, an FPGA for device communication (...)

  • Full Characterization and evaluation of DDC1128
  • Option for custom sensor boards
  • Flexible supply configurations
  • FPGA based device configuration and data capture
  • USB 2.0 interface

Design tools & simulation

SLAM217.ZIP (25 KB) - IBIS Model
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 (...)
  • 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
NFBGA (ZKL) 192 View options

Ordering & quality

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  • MSL rating/Peak reflow
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  • Qualification summary
  • Ongoing reliability monitoring

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Support & training

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