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EAGLE Library Object

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Object details

Name:DDC232
Type:device
Description:32-Channel, Current-Input Analog-to-Digital Converter

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 166ms to 1s, allowing currents from fAs to mAs 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.

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

Datasheet:

http://www.ti.com/lit/ds/symlink/ddc232.pdf

Additional information:

Basics of operation can be found in the DDC112 datasheet:
http://www.ti.com/lit/ds/symlink/ddc112.pdf
For practical daisychaining and layout considerations, consider the DDC112 evaluation board documentation:
http://www.ti.com/lit/an/sbaa029/sbaa029.pdf

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DDC232

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