DDC1128 - Texas Instruments

DDC1128 Current-Input Analog-to-Digital Converter

The DDC1128 is a 20-bit, 128-channel, current-input analog-to-digital (A/D) converter. It combines both current-to-voltage and A/D conversion so that 128 separate low-level current output devices, such as photodiodes, can be directly connected to its inputs and digitized. For each of the 128 inputs, the DDC1128 uses the proven dual switched integrator front-.

Features

•1 Single-Chip Solution to Directly Measure 128 Low-Level Currents
• Proven High-Precision, True Integrating Architecture with 100% Charge Collection
• Easy Upgrade for Existing DDC Family Applications
• Low Power: 3 mW/channel at 3 kSPS
• Extremely Linear: INL = ±0.025% of Reading ±1 ppm of FSR
• Low Noise: 6.3 ppm of FSR
• Adjustable Full-Scale Range
• Adjustable Speed
  – Data Rates up to 6 kSPS with 20-bit Performance
  – Integration Times as low as 160 μs
• Daisy-Chainable Serial Interface
• In-Package Bypass Capacitors Simplify PCB Design Area and Design Complexity 2 Applications
• CT Scanne.