Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
TLC2933IPW Texas Instruments	TLC2933 HIGH PERFORMANCE PHASE L	32441
CDCE906PWG4 Texas Instruments	CDCE906 PROGRAMMABLE 3-PLL CLOCK	39
LMK04828BISQE/NOPB Texas Instruments	IC CLOCK DUAL PLL 64-WQFN	509
CDC5801DBQR Texas Instruments	PLL BASED CLOCK DRIVER, 5801 SER	6480
LMX1501AMX Texas Instruments	FREQUENCY SYNTHESIZER	30
LMX2531LQE3010E/NOPB Texas Instruments	IC PLL FREQ SYNTH W/VCO 36WQFN	0
CDC586PAHR Texas Instruments	PLL CLOCK DRIVER	12000
CDCE421RGER Texas Instruments	CLOCK GENERATOR	18000
CDCL6010RGZR Texas Instruments	1.8V CLOCK MULTIPLIER, JITTER CL	2500
LMX2531LQ1226E/NOPB Texas Instruments	LMX2531 HIGH PERFORMANCE FREQUEN	5000
LMK04821NKDR Texas Instruments	IC CLOCK JITTER CLEANER 64WQFN	0
TRF3761-FIRHAR Texas Instruments	PLL FREQUENCY SYNTHESIZER	7500
CDC5801DBQG4 Texas Instruments	IC CLOCK MLT/DIV LOW JTTR 24QSOP	0
TRF3750IPWG4 Texas Instruments	PLL FREQUENCY SYNTHESIZER, CMOS	160
CDCE949PWRG4 Texas Instruments	IC 4-PLL VCXO LVCMOS 24-TSSOP	0
LMK03001DISQX/NOPB Texas Instruments	IC CLOCK CONDITIONER 48QFN	0
CDCM7005RGZT Texas Instruments	IC CLK SYNC/JITTER CLEANR 48VQFN	386
LMX2531LQ2570E/NOPB Texas Instruments	IC PLL FREQ SYNTH W/VCO 36WQFN	2328
CDCF5801ADBQ Texas Instruments	IC PLL CLOCK MULTIPLIER 24-QSOP	61
CDCVF857RTBT Texas Instruments	PLL CLOCK DRIVER	16059

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.