FEATURES

· SINGLE-CHIP SOLUTION TO MEASURE 16

LOW-LEVEL CURRENTS

· INTEGRATING I-TO-V CONVERSION

FRONT-END

· PROGRAMMABLE FULL-SCALE : 3pC to 12pC

· ADJUSTABLE SPEED:

– Data Rate Up To 100kSPS

– Integration Time Down To 10ms

· ANALOG SUPPLY: +5V

· DIGITAL SUPPLY: +3.3V

APPLICATIONS

· CT SCANNER DAS

· PHOTODIODE SENSORS

· X-RAY DETECTION SYSTEMS

DESCRIPTION

The DDC316 is a 16-bit, 16-channel, current-input

analog-to-digital converter (ADC). It combines both

current-to-voltage and analog-to-digital (A/D)

conversion so that 16 separate low-level current

output devices (such as photodiodes) can be directly connected to its inputs and digitized.

For each of the 16 inputs, the DDC316 provides a

dual-switched integrator front-end. This configuration

allows for continuous current integration: while one

integrator is being digitized by the on-chip ADC, the

other is integrating the input current. Adjustable integration times range from 10ms to 1ms.

The DDC316 provides a serial interface of the output

data, either multiplexed onto a single data output pin or parallel on four output pins. The output mode can

be selected based on the available integration time.

The DDC316 uses a +5V analog supply and a +3.3V

digital supply. Operating over the temperature range

of 0°C to +70°C, the DDC316 is offered in a BGA-64

package.