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
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