Product details

Number of input channels 256 Resolution (Bits) 24 Features Computed Tomography (CT) Operating temperature range (C) 0 to 70 Interface type LVDS/Serial
Number of input channels 256 Resolution (Bits) 24 Features Computed Tomography (CT) Operating temperature range (C) 0 to 70 Interface type LVDS/Serial
  • 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
  • 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

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

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
* Data sheet DDC2256A 256-Channel, Current-Input Analog-To-Digital Converter datasheet (Rev. B) PDF | HTML 27 May 2016
EVM User's guide DDC2256AEVM Introduction User's Guide 01 Apr 2016
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Design & development

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Evaluation board

DDC2256AEVM — DDC2256A 256-Channel Current-Input Analog-to-Digital Converter Evaluation Module

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 (...)

Simulation model

DDC2256 IBIS Model DDC2256 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 (...)
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