The 12-bit, 550-Msample/s ADS54RF63 monolithic analog-to-digital converter (ADC) from Texas Instruments provides more than 200 MHz of signal bandwidth in applications where high resolution, accuracy, and linearity are critical (see the figure). This pipeline ADC also offers the highest spurious-free dynamic range (SFDR) and signal-to-noise ratio (SNR) available for input frequencies (IF) above 500 MHz, according to the company. These specs should enable more efficient power-amplifier linearization in digital pre-distortion solutions, better range and sensitivity in defense imaging and communication systems, and higher accuracy in wide-band test and measurement equipment.
The ADC provides a 64.1-dBFS SNR and 80-dBc SFDR at 450 MHz with 500 Msamples/s. It also provides a 62.5-dBFS SNR and 70-dBc SFDR at 900 MHz with 500 Msamples/s. Built in TI’s BiCom3 technology, the ADS54RF63 supplies a fully buffered differential analog input as well. Furthermore, it allows for high IF and direct RF sampling architectures to simplify system design. It eases analog front-end design by providing constant input impedance over input frequency and eliminating track-and-hold kickback. And, it works well in high-temperature and high-radiation environments, according to TI.
Available in a 14- by 14-mm thin quad flat-pack (TQFP) that’s pin-compatible with the ADS5463 and ADS5474, the ADS54RF63 costs $175 in 1000-piece quantities.
Texas Instruments
Related Articles
Understanding Continuous-Time, Discrete-Time Sigma-Delta ADCs And Nyquist ADCs
Using Delta-Sigma Can Be As Easy As ADC (Part 4)
RF/IF Drive High-Frequency ADCs With Low Distortion, High Linearity