ASNT7123A-KMA

Analog To Digital Converters (ADC) Overview

The ASNT7123A-KMA is a 4-bit flash analog-to-digital converter (ADC) featuring a 20 GHz analog input bandwidth and a sampling rate up to 16 GS/s. It operates from a single +3.5 V supply with a power consumption of 4.62 W. The device supports selectable clocking modes, including an external high-speed clock or an internal PLL with a central frequency of 10 GHz driven by an LVDS reference clock. Key features include a broadband operation range of DC-16 GS/s in external clocking mode, on-chip PRBS generation for output data scrambling, and differential CML input/output buffers. The component is housed in a custom 100-pin metal-ceramic package.

Analog To Digital Converters (ADC) Feature Summary

• High-speed 4-bit Flash ADC architecture with 20 GHz analog input bandwidth and 16 GS/s maximum sampling rate.
• Dual clocking options: External high-speed clock (DC-16 GHz) or internal PLL (central frequency 10 GHz) with LVDS reference input.
• Integrated 32-kbit PRBS generator (x^15+x^14+1) and scrambler for self-testing and signal integrity verification.
• On-chip DAC for functional testing and adjustable threshold control via vrefcrl and vlsbcrl pins.

Analog To Digital Converters (ADC) Applications

• High-speed oscilloscopes and test equipment requiring wideband signal acquisition.
• Digital communication systems utilizing direct RF sampling architectures.
• Military and aerospace radar signal processing applications.
• Broadband instrumentation requiring precise timing and low aperture jitter.

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix KMA corresponds to the 100-pin metal-ceramic CQFP package configuration. Confirm that the required thermal management solutions accommodate the 4.62 W power dissipation and junction temperature limits specified in the datasheet. Ensure compatibility with the single +3.5 V power supply requirement and 2.5V CMOS control logic levels.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a 4-bit resolution at sampling rates up to 16 GS/s is sufficient for the application. Consider the internal PLL if a stable LVDS reference clock is available, otherwise utilize the external clocking mode for frequencies up to 16 GHz. Evaluate the need for the integrated PRBS generator and DAC for built-in self-test capabilities. Ensure the PCB design supports the differential CML I/O requirements and proper termination strategies.

Analog To Digital Converters (ADC) Part Context

The ASNT7123A-KMA belongs to the ADSANTEC high-frequency integrated circuit family, specifically designed for broadband digital and analog signal processing. It complements other multiplexers and demultiplexers in the portfolio by providing high-speed digitization capabilities. The device utilizes advanced fabrication technology to achieve wide bandwidth and low jitter performance in a robust metal-ceramic package suitable for demanding environments.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. When evaluating alternatives, ensure the replacement matches the 16 GS/s sampling rate, 20 GHz bandwidth, 4-bit resolution, and 100-pin CQFP package dimensions. Verify compatibility with the +3.5 V supply voltage and CML interface standards.

Analog To Digital Converters (ADC) FAQ

What are the two operating modes for the Clock Multiplication Unit (CMU)?

The CMU operates in 'clock multiplication' mode (PLL enabled, reference clock applied to crp/crn) or 'clock division' mode (PLL disabled, external high-speed clock applied to cep/cen).

How is the ADC threshold voltage adjusted?

Threshold voltages are controlled by analog signals vrefcrl and vlsbcrl. vrefcrl shifts the DC levels of all thresholds, while vlsbcrl alters the LSB voltage range and shifts DC levels.

What is the function of the on-chip PRBS generator?

The PRBS generator produces a 32-kbit pseudo-random binary sequence using polynomial x^15+x^14+1. It can be mixed with output data via the scrambler for testing or disabled to pass data unchanged.