DDC2256A Series
256-Channel, Current-Input Analog-To-Digital Converter
Manufacturer: Texas Instruments
Catalog
256-Channel, Current-Input Analog-To-Digital Converter
Key Features
• Single-Chip Solution to Directly Measure 256 Low-Level Currents SimultaneouslyUser Adjustable Full-Scale RangeAdjustable Speed with Integration Times as Lowas 58.8 µs (17 KSPS per channel) with 24 bitResolutionPower Dissipation as Low as 1.7mW/channelIntegral Linearity: ±0.025% of Reading ±1 ppm ofFull Scale Reading (all channels active)Low Noise24 bit ADCNo Charge Loss and Simultaneous SamplingOn-board Temperature SensorIn-Package Bypass Capacitors and ReferenceBuffer to Reduce PCB Area and Design ComplexitySerial LVDS and CMOS Output Interface OptionSingle-Chip Solution to Directly Measure 256 Low-Level Currents SimultaneouslyUser Adjustable Full-Scale RangeAdjustable Speed with Integration Times as Lowas 58.8 µs (17 KSPS per channel) with 24 bitResolutionPower Dissipation as Low as 1.7mW/channelIntegral Linearity: ±0.025% of Reading ±1 ppm ofFull Scale Reading (all channels active)Low Noise24 bit ADCNo Charge Loss and Simultaneous SamplingOn-board Temperature SensorIn-Package Bypass Capacitors and ReferenceBuffer to Reduce PCB Area and Design ComplexitySerial LVDS and CMOS Output Interface Option
Description
AI
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 mm2323-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 mm2323-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
