Introducing IC4X’s SDM12_30M_22FDX: A Low-Noise, Wide-Band Continuous-Time ΣΔ ADC IP Solution

IC4X continues to innovate in the field of analog-to-digital conversion with the launch of the ADC12_30M_22FDX. This high-performance, low-noise, wide-band, continuous-time Sigma-Delta (ΣΔ) ADC is designed to meet the rigorous demands of modern digital systems. It effectively converts fully differential analog input signals into an oversampled 4-bit data stream. A customizable decimator is available on request.

Performance and Key Specifications

The ADC12_30M_22FDX uses a fully frequency-agile input clock, allowing for flexible bandwidths between 7.5MHz up to 30MHz. This level of versatility is powered by an on-chip calibration engine. The full IP operates on a 0.9V power supply.

Key features include:

  • RC Time Constant Calibration: Enabling frequency-agile operation with an input clock frequency ranging from 250MHz to 1GHz, allowing the ADC to adapt to varying system requirements.

  • 800Ω Input Impedance: Optimized for differential input signals, maintaining low thermal noise specifications.

  • 74dB Signal-to-Noise Ratio (SNR)

  • Effective Number of Bits (ENOB): 11.8-bit: Demonstrating a high level of precision in capturing analog signals.

  • Dynamic Range (DR) with 12-bit no missing codes: Ensuring consistent signal integrity across a wide input range.

  • Full Scale Analog Input Range: Supporting up to 1.2Vppd for maximum signal accommodation.
  • Current Consumption: 33mA (max): Offering power efficiency without compromising performance.

  • On-Board Digital Calibration Engine: Maintaining 1.2VPPD across fully frequency-agile 7.5MHz – 30MHz signal bandwidth.

  • Operating Temperature Range: Suitable for extreme conditions from -20°C to 125°C.

Optimized Design and Applications

The ADC12_30M_22FDX features a compact ΣΔ modulator core area of 0.4mm², making it a perfect fit for I/Q receiver applications where an excellent 2:1 silicon aspect ratio is crucial. Additionally, its inherent anti-aliasing filter properties enhance signal integrity, mitigating out-of-band interferers.

To ensure compatibility with various systems, the ADC offers a CML clock input interface with a 600mVppd amplitude, and the optional Data Weighted Averaging (DWA) mismatch shaping further improves linearity and reduces harmonic distortion.

Silicon Proven in 22FDX Technology

The ADC14_30to60MS_22FDX is silicon-proven in 22FDX technology from GlobalFoundries (GF), which guarantees a reliable, high-performance solution that has been validated for a wide range of applications.

Applications

  • IoT Networks: Supporting reliable and energy-efficient data acquisition in connected devices.
  • Automotive Systems: Ensuring robust and accurate signal conversion for in-vehicle communication and control.
  • Data Acquisition Systems: Delivering high-resolution multi-channel data processing for industrial and scientific applications.
  • Housekeeping ADCs: Providing reliable monitoring of system parameters in complex electronics.
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