LMK04808 - 具有双环 PLL 的 LMK04800 系列低噪声时钟抖动消除器

LMK04808是TI德州仪器公司的一款双/级联PLL产品，LMK04808是具有双环 PLL 的 LMK04800 系列低噪声时钟抖动消除器，本站介绍了LMK04808的封装应用图解、特点和优点、功能等，并给出了与LMK04808相关的TI元器件型号供参考。

LMK04808 - 具有双环 PLL 的 LMK04800 系列低噪声时钟抖动消除器 - 双/级联PLL - 时钟抖动消除器 - 德州仪器

产品特性

Ultra-Low RMS Jitter Performance
- 111 fs RMS Jitter (12 kHz to 20 MHz)
- 123 fs RMS Jitter (100 Hz to 20 MHz)
Dual Loop PLLatinum™ PLL Architecture
PLL1
- Integrated Low-Noise Crystal Oscillator Circuit
- Holdover Mode when Input Clocks are Lost
- Automatic or Manual Triggering/Recovery
PLL2
- Normalized PLL Noise Floor of –227 dBc/Hz
- Phase Detector Rate up to 155 MHz
- OSCin Frequency-Doubler
- Integrated Low-Noise VCO
2 Redundant Input Clocks with LOS
- Automatic and Manual Switch-Over Modes
50 % Duty Cycle Output Divides, 1 to 1045 (Even and Odd)
12 LVPECL, LVDS, or LVCMOS Programmable Outputs
Digital Delay: Fixed or Dynamically Adjustable
25 ps Step Analog Delay Control.
14 Differential Outputs. Up to 26 Single Ended.
- Up to 6 VCXO/Crystal Buffered Outputs
Clock Rates of up to 1536 MHz
0-Delay Mode
Three Default Clock Outputs at Power Up
Multi-Mode: Dual PLL, Single PLL, and Clock Distribution
Industrial Temperature Range: –40 to 85°C
3.15-V to 3.45-V Operation
2 Dedicated Buffered/Divided OSCin Clocks
Package: 64-Pin WQFN (9.0 × 9.0 × 0.8 mm)

2 Applications

Data Converter Clocking
Wireless Infrastructure
Networking, SONET/SDH, DSLAM
Medical / Video / Military / Aerospace
Test and Measurement

产品说明

The LMK0480x family is the industry's highest performance clock conditioner with superior clock jitter cleaning, generation, and distribution with advanced features to meet next generation system requirements. The dual loop PLLatinum™ architecture is capable of 111 fs rms jitter (12 kHz to 20 MHz) using a low noise VCXO module or sub-200 fs rms jitter (12 kHz to 20 MHz) using a low cost external crystal and varactor diode.

The dual loop architecture consists of two high-performance phase-locked loops (PLL), a low-noise crystal oscillator circuit, and a high-performance voltage controlled oscillator (VCO). The first PLL (PLL1) provides low-noise jitter cleaner functionality while the second PLL (PLL2) performs the clock generation. PLL1 can be configured to either work with an external VCXO module or the integrated crystal oscillator with an external tunable crystal and varactor diode. When paired with a very narrow loop bandwidth, PLL1 uses the superior close-in phase noise (offsets below 50 kHz) of the VCXO module or the tunable crystal to clean the input clock. The output of PLL1 is used as the clean input reference to PLL2 where it locks the integrated VCO. The loop bandwidth of PLL2 can be optimized to clean the far-out phase noise (offsets above 50 kHz) where the integrated VCO outperforms the VCXO module or tunable crystal used in PLL1.

Device Information

PART NUMBER	VCO FREQUENCY	REFERENCE INPUTS
LMK04803	1840 to 2030 MHz	2
LMK04805	2148 to 2370 MHz
LMK04806	2370 to 2600 MHz
LMK04808	2750 to 3072 MHz

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