Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
LMK05318BRGZT Texas Instruments	ULTRA-LOW JITTER SINGLE CHANNEL	10
CDCM6208V2GRGZT Texas Instruments	IC CLK GEN 800MHZ 8 OUPUT 48VQFN	137
TRF3761-HIRHAR Texas Instruments	PLL FREQUENCY SYNTHESIZER	7500
LMK04806BISQ/NOPB Texas Instruments	IC CLOCK DUAL PLL 64WQFN	0
LMK03002CISQ/NOPB Texas Instruments	IC CLOCK CONDITIONER PLL 48WQFN	350
CDCE913PW Texas Instruments	IC PROG PLL VCXO CLK SYN 14TSSOP	402
CDC7005ZVAR Texas Instruments	CDC7005 HIGH PERFORMANCE, LOW PH	18985
LMX2581SQX/NOPB Texas Instruments	LMX2581 WIDEBAND FREQUENCY SYNTH	13360
LMX2572LPRHAR Texas Instruments	IC FREQUENCY SYNTH 40VQFN	0
PLL1706DBQ Texas Instruments	IC MLT-CLK GENERATR DUAL 20-QSOP	42
CDC950DGGRG4 Texas Instruments	PROCESSOR CLOCK GENERATOR	2000
LMX2531LQ1700E/NOPB Texas Instruments	IC PLL FREQ SYNTH W/VCO 36WQFN	422
CDCM9102RHBR Texas Instruments	CDCM9102 LOW NOISE TWO CHANNEL 1	2652
CDCE421ARGER Texas Instruments	CDCE421A FULLY INTEGRATED WIDE R	5942
LMK04110SQX/NOPB Texas Instruments	IC CLOCK COND W/PLL 48WQFN	0
LMK04806BISQE/NOPB Texas Instruments	IC CLOCK DUAL PLL 64WQFN	204
LMK02002ISQX/NOPB Texas Instruments	LMK02002 PRECISION CLOCK DISTRIB	589
CDC2510PWR Texas Instruments	PLL CLOCK DRIVER	51959
LMK04805BISQE/NOPB Texas Instruments	IC CLOCK DUAL PLL 64WQFN	148
CDC921DL Texas Instruments	PROCESSOR SPECIFIC CLOCK GENERAT	388

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.