250-Msample/s 16-Bit ADCs Incorporate Fast JESD204B Interface

With the release of JEDEC’s JESD204B serial data interface, designers are abandoning the 14- to 16-bit parallel differential low-voltage differential signaling (LVDS) connections from analog-to-digital converters (ADCs) to FPGAs, DSPs, or some ASICs. This reduces the number of lines and lengthens the runs for a simpler circuit. Recently, Texas Instruments adopted the JESD204B interface for its 16-bit ADS42JB69 ADC. The …

Improve Your Jitter Performance In Communications Systems

In digital, analog, and RF communications systems, jitter plays a large role in the degradation of signal integrity. This can include a reduced signal-to-noise ratio (SNR) or effective number of bits (ENOB) in analog-to-digital converters (ADCs) or increased bit error rate (BER) in digital and optical channels. Once you examine its sources, you can improve jitter performance from a systems …

Dissecting The High-Speed Amplifier/AAF/ADC Interface

When using an active front-end amplifier to drive a high-speed converter, designing an anti-aliasing filter (AAF) can be a difficult task. It’s important to get it right because anti-aliasing is the characteristic that prevents unwanted noise outside the band of interest from falling in-band. Understanding the need for a good AAF is key to any successful high-speed analog signal chain …

Tighten The Gap Between ADC Datasheet Specs And The Real World

All high-speed analog-to-digital converter (ADC) datasheets show specified performance that really should be considered an ideal response under the best of all possible test conditions. Most systems can’t use coherent sampling, super-narrow bandpass filtering, or very high insertion-loss filters just before the ADC. Upon realizing that those ADC datasheet numbers can’t be achieved in real systems, designers then must take …

Design capacitive touch systems for robustness and manufacturability

In this Product How-To design article, Jean Viljoen of Azoteq details the EMI and other challenges of designing capacitive touch user interfaces and how the company’s ProxSense auto tuning technology maximizes sensitivity, reduces PCB layout constraints and limits overlay thicknesses, negating the need for calibration. The user interface of personal electronics has become critical to the success of the …