DDC232 32 Channel Current-Input 20-bit ADC | TI.com

DDC232 (ACTIVE) 32 Channel Current-Input 20-bit ADC

 

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  • DDC118  - The device has the SAME FUNCTIONALITY as the compared device, but is not pin-for-pin equivalent and may not be parametrically equivalent.   8-Channel, Current-Input Analog-to-Digital Converter
  • DDC114  - The device has the SAME FUNCTIONALITY as the compared device, but is not pin-for-pin equivalent and may not be parametrically equivalent.   4-Channel, Current-Input Analog-to-Digital Converter
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Description

The DDC232 is a 20-bit, 32-channel, current-input analog-to-digital (A/D) converter. It combines both current-to-voltage and A/D conversion so that 32 separate low-level current output devices, such as photodiodes, can be directly connected to its inputs and digitized.

For each of the 32 inputs, the DDC232 provides a 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. Adjustable integration times range from 166µs to 1s, allowing currents from fAs to µAs to be continuously measured with outstanding precision.

The DDC232 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-DDC232 system is minimal.

The DDC232 uses a +5V analog supply and a +2.7V to +3.6V digital supply. Operating over the temperature range of 0°C to +70°C, the DDC232 BGA-64 package is offered in two versions: the DDC232C for low-power applications, and the DDC232CK when higher speeds are required.

Features

  • Single-Chip Solution to Directly Measure 32 Low-Level Currents
  • High-Precision, True Integrating Function
  • Integral Linearity:
    ±0.025% of Reading ±1.0ppm of FSR
  • Very Low Noise: 5.3ppm of FSR
  • Low Power: 7mW/channel
  • Adjustable Full-Scale Range
  • Adjustable Speed
    • Data Rate up to 6kSPS
    • Integration Times as low as 166.5µs
  • Daisy-Chainable Serial Interface
  • In-Package Bypass Capacitors Simplify PCB Design
  • APPLICATIONS
    • CT Scanner DAS
    • Photodiode Sensors
    • X-Ray Detection Systems

All other trademarks are the property of their respective owners.

Parametrics

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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$)
DDC232 Order now 32     20     SPI     Computed Tomography (CT)     0 to 70     64NFBGA: 64 mm2: 8 x 8 (NFBGA | 64)     NFBGA | 64     70.00 | 1ku    
DDC112 Order now 2     20     SPI     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     SPI     Computed Tomography (CT)     0 to 70     192NFBGA: 81 mm2: 9 x 9 (NFBGA | 192)     NFBGA | 192     198.00 | 1ku    
DDC114 Order now 4     20     SPI     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     SPI     Computed Tomography (CT)     -40 to 85     48VQFN: 49 mm2: 7 x 7 (VQFN | 48)     VQFN | 48     30.00 | 1ku    
DDC2256A Samples not available 256     24     LVDS/SPI     Computed Tomography (CT)     0 to 70     323NFBGA: 224 mm2: 14 x 16 (NFBGA | 323)     NFBGA | 323     299.00 | 1ku    
DDC264 Order now 64     20     SPI     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     SPI     Computed Tomography (CT)     0 to 70     64NFBGA: 64 mm2: 8 x 8 (NFBGA | 64)     NFBGA | 64     48.25 | 1ku