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Product details

Parameters

Number of input channels 256 Resolution (Bits) 24 Features Computed Tomography (CT) Operating temperature range (C) 0 to 70 Interface type LVDS/Serial open-in-new Find other Computer tomography (CT) AFEs

Features

  • Single-Chip Solution to Directly Measure 256 Low-
    Level Currents Simultaneously
  • User Adjustable Full-Scale Range
  • Adjustable Speed with Integration Times as Low
    as 58.8 µs (17 KSPS per channel) with 24 bit
    Resolution
  • Power Dissipation as Low as 1.7mW/channel
  • Integral Linearity: ±0.025% of Reading ±1 ppm of
    Full Scale Reading (all channels active)
  • Low Noise
  • 24 bit ADC
  • No Charge Loss and Simultaneous Sampling
  • On-board Temperature Sensor
  • In-Package Bypass Capacitors and Reference
    Buffer to Reduce PCB Area and Design Complexity
  • Serial LVDS and CMOS Output Interface Option
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Description

The DDC2256A is a 24-bit, 256-channel, current-input analog-to-digital (A/D) converter. It combines both current-to-voltage integration and A/D conversion so that 256 individual low-level current output devices, such as photodiodes, can be directly connected to its inputs and digitized in parallel (simultaneously).

For each of the inputs, the DDC2256A has one low noise/low power integrator designed to capture all the charge from the sensor. The integration time is adjustable from 58.8μs to 100 ms, allowing currents from fA to µA to be continuously measured with outstanding precision. The outputs of the integrators are digitized by sixteen 24-bit low power ADCs and all the resulting data is output over a single LVDS serial interface pair designed to minimize noise coupling in environments with high channel count.

The DDC2256A operates from ±2.5-V analog supply, 1.8-V analog supply (AVDD_18) and 1.8-V digital supply (DVDD). The device is specified from 0°C to 70°C operating temperature and available in a 14 × 16 mm2 323-ball 0.8 mm-pitch BGA. Finally, the on board reference buffer and bypass capacitors help minimize the external component requirements and further reduce board space.

To request a full data sheet or other design resources: request DDC2256A

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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
* Datasheet DDC2256A 256-Channel, Current-Input Analog-To-Digital Converter datasheet (Rev. B) May 27, 2016
User guides DDC2256AEVM Introduction User's Guide Apr. 01, 2016
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

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
2499
Description

The DDC2256AEVM evaluation module  (EVM)  is  an  evaluation  kit  for the DDC2256A,  a  256-channel,  current  input,  24-bit analog-to-digital (A/D) converter. The EVM kit, comprised of a DUT board and a capture board, contains two DDC2256A (...)

Features
  • All-in-one solution for evaluating two DDC2256A devices in a system-like setting
  • On-board FPGA, memory, and USB interface allow for data capture and analysis of large sample datasets
  • Flexible supply configurations for simple or advanced experimentation
  • Various input voltage configurations allow for (...)

Design tools & simulation

SIMULATION MODELS Download
SLAM287.ZIP (25 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

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