The 8V19N882 is a fully integrated FemtoClock? RF

Sampling Clock Generator and Jitter Attenuator. The

device is designed as a high-performance clock

solution for conditioning and frequency/phase

management of wireless base station radio

equipment boards. The 8V19N882 is optimized to

deliver excellent phase noise performance as

required in 4G, 5G, and including mmWave radio

implementations. The device supports JESD204B

(subclass 0 and 1) and JESD204C.

A two-stage PLL architecture supports both jitter

attenuation and frequency multiplication. The first

stage PLL is the jitter attenuator and uses an external

VCXO for best possible phase noise characteristics.

The second stage PLL locks on the first PLL output

signal and synthesizes the target frequency. The

second stage PLL can use the internal or an external

high-frequency VCO.

The 8V19N882 generates the high-frequency clocks

and the low-frequency synchronization signals

(SYSREF) from the selected VCO. SYSREF signals

are internally synchronized to the clock signals. The

integrated signal delay blocks can be used to achieve

phase alignment, controlled phase offsets between

system reference and clock signals, and to

align/delay individual output signals. The two

redundant inputs are monitored for activity. Four

selectable clock switching modes can handle clock

input failure scenarios. Auto-lock, individually

programmable output frequency dividers, and phase

adjustment capabilities are added for flexibility.

The 8V19N882 is configured through a 3/4-wire SPI

interface and reports lock and signal loss status in

internal registers and via the GPIO[1:0] outputs.

Internal status bit changes can also be reported via a

GPIO output.

特性 Features

? High-performance clock RF sampling clock

generator and clock jitter attenuator with support

for JESD204B/C

? Low phase noise: -144.7dBc/Hz (800kHz offset;

491.52MHz)

? Integrated phase noise of 74fs RMS (12k-20MHz,

491.52MHz)

? Dual-PLL architecture with internal and optional

external VCO

? Eight output channels with a total of 16 outputs

? Configurable integer clock frequency dividers

? Clock output frequencies: up to 3932.16MHz

(Internal VCO) and ? 6GHz (optional external VCO)

? Differential, low noise I/O

? Deterministic phase delay and integrated phase

delay circuits

? Redundant input clock architecture with two inputs

and monitors, holdover, and input switching

? SPI 3/4 wire configuration interface

? Supply voltage: 1.8V, 2.5V, and 3.3V

? Package: 76 VFQFN (9 x 9 mm2)

? Temperature range: -40°C to +105°C (board)

Applications

? Wireless infrastructure applications: 4G, 5G, and

mmWave

? Data acquisition: jitter-sensitive ADC and DAC

circuits

? Radar, imaging, instrumentation, and medical