DDC2256A 256-Channel, Current-Input Analog-To-Digital Converter | TI.com

DDC2256A
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256-Channel, Current-Input Analog-To-Digital Converter

 

More Information

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

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

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

Parametrics

Compare all products in Computer tomography (CT) AFEs Email Download to Excel
Part number Order Number of input channels Resolution (Bits) Interface Features Operating temperature range (C) Package size: mm2:W x L (PKG) Package Group Approx. price (US$)
DDC2256A Order now 256     24     LVDS/Serial     Computed Tomography (CT)     0 to 70     323NFBGA: 224 mm2: 14 x 16 (NFBGA | 323)     NFBGA | 323     299.00 | 1ku    
DDC112 Order now 2     20     Serial     Computed Tomography (CT)     -40 to 85
0 to 70    
28SOIC: 184 mm2: 10.3 x 17.9 (SOIC | 28)
32TQFP: 81 mm2: 9 x 9 (TQFP | 32)    
SOIC | 28
TQFP | 32    
12.60 | 1ku    
DDC1128 Samples not available 128     20     Serial     Computed Tomography (CT)     0 to 70     192NFBGA: 81 mm2: 9 x 9 (NFBGA | 192)     NFBGA | 192     198.00 | 1ku    
DDC114 Order now 4     20     Serial     Computed Tomography (CT)     -40 to 85     48VQFN: 49 mm2: 7 x 7 (VQFN | 48)     VQFN | 48     17.85 | 1ku    
DDC118 Samples not available 8     20     Serial     Computed Tomography (CT)     -40 to 85     48VQFN: 49 mm2: 7 x 7 (VQFN | 48)     VQFN | 48     30.00 | 1ku    
DDC232 Samples not available 32     20     Serial     Computed Tomography (CT)     0 to 70     64NFBGA: 64 mm2: 8 x 8 (NFBGA | 64)     NFBGA | 64     70.00 | 1ku    
DDC264 Order now 64     20     Serial     Computed Tomography (CT)     0 to 70     100NFBGA: 81 mm2: 9 x 9 (NFBGA | 100)     NFBGA | 100     99.00 | 1ku    
DDC316 Samples not available 16     16     Serial     Computed Tomography (CT)     0 to 70     64NFBGA: 64 mm2: 8 x 8 (NFBGA | 64)     NFBGA | 64     48.25 | 1ku