DDC2256A - Texas Instruments

DDC2256A Current-Input Analog-To-Digital Converter

The DDC2256A is a 24-bit, 256-channel, currentinput 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.

Features

•1 Single-Chip Solution to Directly Measure 256 LowLevel Currents Simultaneously
• User Adjustable Full-Scale Range
• Adjustable Speed with Integration Times as Low as 58.8 µs (17 KSPS per channel) with 24 bit Resolution
• Power Dissipation as Low as 1.7mW/channel
• Integral Linearity: ±0.025% of Reading ±1 ppm of Full Scale Reading (all channels active)
• Low Noise
• 24 bit ADC
• No Charge Loss and Simultaneous Sampling
• On-board Temperature Sensor
• In-Package Bypass Capacitors and Reference Buffer to Reduce PCB Area and Design Complexity
• Serial LVDS and CMOS Output Interface Option 2 App.