Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
CDCM61001RHBR/2801 Texas Instruments	IC CLK GEN 1:1 LOW JITTER 32QFN	0
CDC421A125RGER Texas Instruments	IC CLK GEN 125.00MHZ 3.3V 24VQFN	0
CDCV855PWRG4 Texas Instruments	IC PLL CLOCK DRVR 2.5V 28TSSOP	0
LMK04133SQ/NOPB Texas Instruments	LMK04133 CLOCK JITTER CLEANER WI	792
CDC9841DWR Texas Instruments	CLOCK GENERATOR	1000
LMX2694SRTCTEP Texas Instruments	HIGH PERFORMANCE PLL/SYN	0
CD74HCT4046AM96 Texas Instruments	IC PLL W/VCO HS 16-SOIC	6862
CD74HC7046AM Texas Instruments	PHASE LOCKED LOOP, CMOS, PDSO16	66489
CDCVF857RHATG4 Texas Instruments	IC PLL CLOCK DRIVER 2.5V 40VQFN	0
CDCEL824PWR Texas Instruments	CDCEL824 CDCEL824 PROGRAMMABLE 2	44000
LMX2541SQE3030E/NOPB Texas Instruments	IC PLL FREQ SYNTH W/VCO 36WQFN	0
LMK04110SQ/NOPB Texas Instruments	IC CLOCK COND W/PLL 48WQFN	0
PLL1708DBQ Texas Instruments	IC MULTI-CLK GENERATR PLL 20QSOP	174
CDCVF857GQLR Texas Instruments	PLL CLOCK DRIVER	18000
LMX2571NJKT Texas Instruments	IC FREQ SYNTHESIZER VCO	737
CDC421A100RGET Texas Instruments	CDC421A100 FULLY INTEGRATED FIXE	13248
CD74HCT4046AE Texas Instruments	IC PLL W/VCO HS 16-DIP	2039
TLC2932AIPW Texas Instruments	IC PLL SYSTEM HP 14-TSSOP	160
CDC516DGGG4 Texas Instruments	IC PLL CLOCK DVR 3.3V 48-TSSOP	0
TRF3761-JIRHAT Texas Instruments	TRF3761-J LOW NOISE INTEGER N PL	456

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.