DDC118 Octal Current-Input 20-Bit Analog-to-Digital Converter | TI.com

DDC118
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
Octal Current-Input 20-Bit Analog-to-Digital Converter

 

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Description

The DDC118 is a 20-bit octal channel, current-input analog-to-digital (A/D) converter. It combines both current-to-voltage and A/D conversion so that eight low-level current output devices, such as photodiodes, can be directly connected to its inputs and digitized.

For each of the eight inputs, the DDC118 provides a dual-switched integrator front-end. This design 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 full-scale ranges from 12pC to 350pC and adjustable integration times from 50µs to 1s allow currents from fAs to µAs to be measured with outstanding precision. Low-level linearity is ±0.5ppm of the full-scale range and noise is 5.2ppm of the full-scale range.

Two modes of operation are provided. In Low-Power mode, total power dissipation is only 13.5mW per channel with a maximum data rate of 2.5kSPS. High-Speed mode supports data rates up to 3.125kSPS with a corresponding dissipation of 18mW per channel.

The DDC118 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-DDC118 system is minimal.

The DDC118 is a single-supply device using a +5V analog supply and supporting a +2.7V to +5.25V digital supply. Operating over the industrial temperature range of -40°C to 85°C, the DDC118 is offered in a QFN-48 package.

Features

  • SINGLE-CHIP SOLUTION TO DIRECTLY MEASURE EIGHT LOW-LEVEL CURRENTS
  • HIGH PRECISION, TRUE INTEGRATING FUNCTION
  • INTEGRAL LINEARITY: ±0.01% of Reading ±0.5ppm of FSR
  • VERY LOW NOISE: 5.2ppm of FSR
  • LOW POWER: 13.5mW/channel
  • ADJUSTABLE DATA RATE: Up to 3.125kSPS
  • PROGRAMMABLE FULL SCALE
  • DAISY-CHAINABLE SERIAL INTERFACE
  • APPLICATIONS
    • CT SCANNER DAS
    • PHOTODIODE SENSORS
    • INFRARED PYROMETER
    • LIQUID/GAS CHROMATOGRAPHY

Protected by US Patent #5841310
All trademarks are the property of their respective owners.

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$)
DDC118 Order now 8     20     Serial     Computed Tomography (CT)     -40 to 85     48VQFN: 49 mm2: 7 x 7 (VQFN | 48)     VQFN | 48     30.00 | 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    
DDC2256A Samples not available 256     24     LVDS/Serial     Computed Tomography (CT)     0 to 70     323NFBGA: 224 mm2: 14 x 16 (NFBGA | 323)     NFBGA | 323     299.00 | 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