DDC232 Status: ACTIVE

Product Information

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 DATA RATE: Up to 6kSPS
  • Integration Times Down to 166.5µs
• DAISY-CHAINABLE SERIAL INTERFACE
• APPLICATIONS
  • CT SCANNER DAS
  • PHOTODIODE SENSORS
  • X-RAY DETECTION SYSTEMS

Protected by US Patent #5841310

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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 µs 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 is offered in a BGA-64 package.