Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
LMX2492RTWT Texas Instruments	IC HIGH FREQ PLL 24WQFN	2715250
CDCVF855PWR Texas Instruments	IC PLL CLOCK DVR 2.5V 28-TSSOP	0
TRF3761-CIRHAT Texas Instruments	IC INTEGER-N PLL W/VCO 40VQFN	0
LMK04100SQ/NOPB Texas Instruments	LMK04100 PRECISION CLOCK CONDITI	730
LMK04826BISQX/NOPB Texas Instruments	IC CLOCK DUAL PLL 64-WQFN	0
CDC7005RGZR Texas Instruments	PLL CLOCK DRIVER	34843
CDCV855IPWR Texas Instruments	IC PLL CLOCK DRVR 2.5V 28TSSOP	0
CDCV850IDGGR Texas Instruments	PLL CLOCK DRIVER	6586
LMK03000DISQX/NOPB Texas Instruments	IC CLOCK CONDITIONER 48QFN	0
HPA00126DGGR Texas Instruments	IC PLL DDR CLOCK DRIVER 48TSSOP	0
LMK04821NKDT Texas Instruments	IC CLOCK DUAL PLL 64-WQFN	123
LMK03001CISQX/NOPB Texas Instruments	IC CLOCK COND PREC VCO 48WQFN	0
TLC2933AIPWR Texas Instruments	IC PLL SYSTEM HP 14-TSSOP	3325
SN74LV4046ADR Texas Instruments	IC LOGIC PLL W/VCO 16-SOIC	994
CDC913DW Texas Instruments	CLOCK GENERATOR	1200
LMK04228NKDT Texas Instruments	CLOCKING IC	250
LMK04828BISQ/NOPB Texas Instruments	IC CLOCK DUAL PLL 64-WQFN	207
CDC5801DBQRG4 Texas Instruments	IC CLOCK MLT/DIV LOW JTTR 24QSOP	0
TRF2052PW Texas Instruments	PLL/FREQUENCY SYNTHESIS CIRCUIT,	363
LMK04133SQX/NOPB Texas Instruments	IC CLOCK COND W/PLL 48WQFN	0

Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

1. Overview

Clock and timing ICs are semiconductor devices that generate, regulate, and distribute timing signals in electronic systems. Key components include Clock Generators (produce stable clock signals), Phase-Locked Loops (PLLs, synchronize signals with phase alignment), and Frequency Synthesizers (generate precise frequencies from reference signals). These devices ensure synchronization across components in modern electronics, enabling reliable operation in communication systems, computing devices, and industrial equipment.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Clock Generators	Produce fixed or programmable clock signals with low jitter	Microprocessors, FPGAs, networking equipment
PLLs	Align output signal phase with reference input, enable frequency multiplication	Wireless transceivers, data recovery circuits
Frequency Synthesizers	Generate multiple frequencies from single reference with high precision	5G base stations, satellite communication systems

3. Structure and Components

Typical clock ICs feature: 1) Crystal oscillator interface for reference signal input; 2) Internal voltage-controlled oscillator (VCO); 3) Phase detector and loop filter (PLL components); 4) Programmable dividers; 5) Output buffers. Advanced packages include QFN (4x4mm to 8x8mm) and TSSOP with 8-48 pins. Integration levels vary from single-channel devices to multi-output clock generators with integrated EEPROM.

4. Key Technical Specifications

Parameter	Typical Range	Importance
Frequency Range	1 kHz - 3.6 GHz	Determines application compatibility
Phase Noise	-150 to -120 dBc/Hz	Impacts signal integrity
Jitter (RMS)	50 fs - 1 ps	Critical for high-speed systems
Power Consumption	10-300 mA	Affects thermal design
Temperature Stability	20-100 ppm	Ensures reliability in harsh environments

5. Application Fields

Telecommunications: 5G NR base stations, optical transceivers
Computing: Server motherboards, PCIe clocks
Industrial: Precision test equipment, motor control systems
Automotive: ADAS sensors, infotainment systems
Medical: MRI imaging systems, patient monitoring devices

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TI (Texas Instruments)	LMX2594	15-GHz wideband PLL with integrated VCO
Analog Devices	AD9548	4-channel clock generator with 0.1 ppb accuracy
STMicroelectronics	CLK2692	Programmable 2-output synthesizer for automotive
Microchip	ZL30264	High-performance network synchronizer

7. Selection Guidelines

Key selection criteria: 1) Required output frequency and voltage levels; 2) Acceptable phase noise/jitter specifications; 3) Number of required outputs; 4) Operating temperature range; 5) Power budget constraints; 6) Integration level (e.g., single-chip vs. discrete VCO solutions). For wireless applications, prioritize low phase noise. For portable devices, emphasize power efficiency.

8. Industry Trends

Future developments include: 1) Higher integration with on-chip EEPROM and multi-phase outputs; 2) Advancement to sub-10fs jitter performance; 3) Development of radiation-hardened variants for aerospace; 4) Adoption of 3D packaging for reduced EMI; 5) Increased use of AI-enabled dynamic frequency scaling. The market is projected to grow at 7.2% CAGR through 2027 driven by 5G and automotive electrification.