DDC2256A

The DDC2256A is a 24-bit, 256-channel, current-input analog-to-digital (A/D) converter. It combines both current-to-voltage integration and A/D conversion so that 256 individual low-level current output devices, such as photodiodes, can be directly connected to its inputs and digitized in parallel (simultaneously).

For each of the inputs, the DDC2256A has one low noise/low power integrator designed to capture all the charge from the sensor. The integration time is adjustable from 58.8μs to 100 ms, allowing currents from fA to µA to be continuously measured with outstanding precision. The outputs of the integrators are digitized by sixteen 24-bit low power ADCs and all the resulting data is output over a single LVDS serial interface pair designed to minimize noise coupling in environments with high channel count.

The DDC2256A operates from ±2.5-V analog supply, 1.8-V analog supply (AVDD_18) and 1.8-V digital supply (DVDD). The device is specified from 0°C to 70°C operating temperature and available in a 14 × 16 mm² 323-ball 0.8 mm-pitch BGA. Finally, the on board reference buffer and bypass capacitors help minimize the external component requirements and further reduce board space.

To request a full data sheet or other design resources: request DDC2256A