DDC3256ZWX

Analog To Digital Converters (ADC) Overview

The DDC3256ZWX is a 24-bit, 256-channel current-input analog-to-digital converter designed for simultaneous low-level current measurement. It integrates current-to-voltage conversion via charge integration and digitization on a single chip. The device supports adjustable full-scale charge ranges up to 320 pC with input currents up to 1 µA. Integration times are configurable from 50 µs to 1.6 ms, enabling speeds of 20 KSPS per channel. Key electrical specifications include an integral non-linearity of ±0.025% of reading ±1 ppm of full scale range and a noise level of 0.26 fCrms at 320 pC FSR with 20 pF sensor capacitance. Power dissipation is 1.2 mW per channel, operating from a single 1.85-V supply.

Analog To Digital Converters (ADC) Feature Summary

• Single-chip architecture directly measures 256 low-level currents simultaneously without external multiplexing
• On-chip integrators capture all charge from sensors with no charge loss
• Serial LVDS output interface minimizes noise coupling in high channel count environments
• Integrated bypass capacitors and reference buffer reduce PCB area and design complexity

Analog To Digital Converters (ADC) Applications

• CT Scanner data acquisition systems
• X-ray detection systems
• Photodiode sensors
• Optical fiber power monitoring
• Multi-channel current and voltage instrumentation

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix ZWX to confirm the NFBGA package configuration and pin count. Ensure compatibility with the required 0 to 70°C operating temperature range for your application environment. Confirm that the EIAJ tray packaging format aligns with your assembly line handling capabilities. Cross-reference the latest datasheet revision SLASFA0 for any updates to mechanical dimensions or electrical characteristics before finalizing procurement.

Analog To Digital Converters (ADC) Selection Notes

Select this component when designing systems requiring parallel digitization of hundreds of photodiode or sensor inputs. The 24-bit resolution and low noise floor make it suitable for precision medical imaging and scientific instrumentation. Evaluate the 1.85-V single supply requirement against your system's power budget. Consider the BGA footprint constraints and thermal management needs associated with the 336-ball package layout during the initial schematic phase.

Analog To Digital Converters (ADC) Part Context

The DDC3256 belongs to Texas Instruments' specialized analog-to-digital converter portfolio focused on high-channel-count applications. It addresses the need for compact, low-power solutions in medical and industrial sensing where traditional multiplexed architectures introduce latency and complexity. The device consolidates signal conditioning and conversion functions typically distributed across multiple discrete components into a single integrated circuit.

Analog To Digital Converters (ADC) Replacement Considerations

No direct public substitute part numbers are documented in the official datasheet. Designers should evaluate other TI high-channel ADCs based on channel count and resolution requirements if this specific model is unavailable.