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The 8V19N490-19BDGI is a JESD204B/C clock jitter attenuator launched by (Renesas), featuring a two-stage PLL architecture. It is mainly used in scenarios with high requirements for clock accuracy, such as wireless base stations and communication equipment. The following are its core features:

High-performance clock RF-PLL, supporting JESD204B

Optimized for low phase noise: -150 DBC /Hz (800kHz offset; 245.76MHz clock

Integral phase noise: 52fs RMS (typical value, 12kHz - 20MHz)

Dual PLL architecture

The first-stage PLL with an external VCXO can attenuate clock jitter

Second-stage PLL with internal FemtoClock NG PLL: 1966.08MHz

There are six output channels, totaling 19 outputs, which are divided into:

Four JESD204B channels (device clock and SYSREF output), with two-channel, four-channel and six-channel outputs

One clock channel, two outputs

A VCXO output

Configurable integer clock divider

The supported clock output frequencies include: 2949.12, 1474.56, 983.04, 491.52, 245.76, and 122.88

The low-power LVPECL/LVDS output supports configurable signal amplitudes, DC and AC coupling, as well as LVPECL and LVDS line termination technologies

Phase delay circuit

Clock phase delay, 256 steps 339ps, range 0 to 86.466ns

Independent SYSREF phase delay with eight levels of 169ps

An additional single SYSREF fine phase delay with a step size of 25ps

Global SYSREF signal delay, 256 steps 339ps, range 0 to 86.466ns

The redundant input clock architecture has four input terminals, including:

Input activity monitoring

Manual and automatic, fault-triggered clock selection modes

Priority control of clock selection

Digital hold and uninterrupted switching

The differential input accepts LVDS and LVPECL signals

The SYSREF generation mode includes both the internal and external trigger modes of JESD204B

Supply voltage: 3.3V

SPI and control I/O voltage: 1.8V/3.3V (optional)

Package: 11 x 11 mm 100-CABGA

Overview

The 8V19N490-19BDGI is a fully integrated FemtoClock® NG jitter attenuator and clock synthesizer, a high-performance clock solution for conditioning and frequency/phase management of radio equipment boards in wireless base stations. The 8V19N490-19BDGI has been optimized to offer outstanding phase noise performance, meeting the requirements of GSM, WCDMA, LTE and LTE-A radio board implementations. This device supports JESD204B subclass 0 and 1 clocks.

The two-level PLL architecture supports jitter attenuation and frequency doubling. The first-level PLL is a jitter attenuator, which uses an external VCXO to achieve the best phase noise characteristics. The second-level PLL locks the VCXO-PLL output signal and synthesizes the target frequency.

The 8V19N490-19BDGI supports generating high-frequency clocks from the selected VCO and low-frequency synchronization signals (SYSREF). The SYSREF signal is internally synchronized with the clock signal. In addition, the 8V19N490-19BDGI also features a delay function, which can adjust and control the phase delay between the system reference signal and the clock signal, and can adjust/delay individual output signals. Monitor the activities of the four redundant input terminals. The 8V19N490-19BDGI offers four optional clock switching modes for handling clock input failure situations. The automatic locking, separately programmable output divider and phase adjustment functions have been added to enhance flexibility. The 8V19N490-19BDGI is configured via a three-wire SPI interface and reports the locked and signal loss status through internal registers and LOCK detection (LOCK) output. Internal status bit changes can also be reported through nINT output. The 8V19N490-19BDGI is an ideal choice for driver converter circuits in wireless infrastructure, radar/imaging, and instrument/medical applications.

Typical applications

▪ Wireless infrastructure applications: GSM, WCDMA, LTE, LTE-A

▪ An ideal clock driver for jitter sensitive ADC and DAC circuits

▪ Low-phase noise clock generation

▪ Ethernet card

▪ Radar and imaging

▪ Instrumentation and medical care ‌

Welcome to contact Mingjiada (www.hkmjd.com) for 8V19N490-19BDGI exclusive quote!