描述 Description

The 8V19N850 is a fully integrated Radio Unit Clock Synchronizer and

Converter Clock Generator designed as a high-performance clock

solution for phase/frequency synchronization and signal conditioning of

wireless base station radio equipment. The device supports

JESD204B/C subclass 0 and 1 device clocks and SYSREF

synchronization for converters.

The 8V19N850 supports two independent frequency domains: one that

can be used for the digital clock (Ethernet and FEC rates) domain with

four outputs, and the device clock (RF-PLL) domain with 12 outputs. The

Ethernet domain generates frequencies from two independent APLLs

for flexibility; the outputs of the RF clock domain generate very low

phase noise clocks for ADC/DAC circuits.

From the integrated RF-PLL, the device supports the clock generation of

high-frequency device clocks for driving ADC/DAC devices

low-frequency synchronization signals (SYSREF).

A dual DPLL front-end architecture supports any frequency translation.

Each DPLL provides a programmable bandwidth and a DCO function for

real-time frequency/phase adjustments. The DPLLs can lock on 1PPS

input signals and establish lock within 100s or less. Frequency

information can be applied from DPLL-0 to DPLL-1 and vice versa to

enable the combining of the frequency characteristics of two references

(combo-mode).

The 8V19N850 is configured through a pin-mapped I3CSM (including

legacy I2

C) and 3/4-wire SPI interface. I2

C with master capabilities

reads a default configuration from an external ROM device. GPIO ports

can be configured for reporting and controlling purposes.

Applications

? Wireless infrastructure 5G radio

特性 Features

? High-performance radio clock synchronizer clock

— Device clock domain (RF-PLL) with support for JESD204B/C

— Digital clock domain (Ethernet, FEC) with support for eEEC

and T-BC/T-TSC Class C

? 2 differential clock reference inputs

— 1PPS (1Hz) to 1GHz input frequency

? Dual DPLL front-end with independent clock paths

— External control of the DCO for IEEE1588

— Digital holdover with a 1.1 × 10-7 ppb accuracy

— Programmable DPLL loop bandwidth 1mHz - 6kHz

— Configurable phase delay (range: 1UI)

— Hitless input switching with < 1ns output phase error

? Reference monitors for input LOS, activity and frequency

? 1 external synchronization input for JESD204B/C (LVCMOS)

? 16 differential outputs

? Dedicated phase management capabilities

? Optimized for low phase noise:

— Device clocks: -149.9dBc/Hz (1MHz offset; 245.76MHz clock)

? Supply voltage (core): 3.3V; (outputs): 3.3V, 2.5V, and 1.8V

? Package: 10 × 10 mm 88-VFQFPN

? Board temperature range: -40°C to +105°C