JAJSEY1C April 2019 – March 2022 ADC12DJ5200RF
ADC12DJ5200RF device is an RF-sampling, giga-sample, analog-to-digital converter (ADC) that can directly sample input frequencies from DC to above 10 GHz. In dual-channel mode, the device can sample up to 5.2 GSPS and up to 10.4 GSPS in single-channel mode. Programmable tradeoffs in channel count (dual-channel mode) and Nyquist bandwidth (single-channel mode) allow development of flexible hardware that meets the needs of both high channel count or wide instantaneous signal bandwidth applications. Full-power input bandwidth (–3 dB) of 8.0 GHz, with usable frequencies exceeding the –3-dB point in both dual- and single-channel modes, allows direct RF sampling of L-band, S-band, C-band, and X-band for frequency agile systems.
The device uses a high-speed JESD204C output interface with up to 16 serialized lanes and subclass-1 compliance for deterministic latency and multi-device synchronization. The serial output lanes support up to 17.16 Gbps and can be configured to trade-off bit rate and number of lanes. Both 8B/10B and 64B/66B data encoding schemes are supported. The 64B/66B encoding schemes support forward error correction (FEC) for improved bit error rates. The JESD204C interface is backwards compatible with JESD204B receivers when using 8B/10B encoding modes.
A number of synchronization features, including noiseless aperture delay (tAD) adjustment and SYSREF windowing, simplify system design for multi-channel systems. Aperture delay adjustment can be used to simplify SYSREF capture, to align the sampling instance between multiple ADCs or to sample an ideal location of a front-end track and hold (T&H) amplifier output. SYSREF windowing offers a simplistic way to measure invalid timing regions of SYSREF relative to the device clock and then choose an optimal sampling location. Dual-edge sampling (DES) is implemented in single-channel mode to reduce the maximum clock rate applied to the ADC to support a wide range of clock sources and relax setup and hold timing for SYSREF capture.
The device provides foreground and background calibration options for gain, offset and static linearity errors. Foreground calibration is run at system startup or at specified times during which the ADC is offline and not sending data to the logic device. Background calibration allows the ADC to run continually while the cores are calibrated in the background so that the system does not experience downtime. The calibration routine is also used to match the gain and offset between sub-ADC cores to minimize spurious artifacts from time interleaving.