Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
CD74HCT7046AE Texas Instruments	PHASE LOCKED LOOP, CMOS, PDIP16	12333
TRF3761-FIRHAT Texas Instruments	TRF3761-F LOW NOISE INTEGER N PL	750
CDC2536DB Texas Instruments	CDC2536 3.3V PLL CLOCK DRIVER WI	12700
CDCE706PWRG4 Texas Instruments	IC 3-PLL SYNTH/MULT/DIV 20-TSSOP	0
TLC2934IPWR Texas Instruments	IC PHASE LOCK LOOP HP 14-TSSOP	365
CDCVF25084PWRG4 Texas Instruments	IC 3.3V 1:8 X4 CLK MULT 16-TSSOP	0
CDCE937QPWRQ1 Texas Instruments	IC 3PLL VCXO CLK SYNTH 20TSSOP	492
CD74HC7046AMT Texas Instruments	IC PLL W/VCO/LOCK DETECT 16SOIC	24710000
CDCVF2510PWG4 Texas Instruments	IC 3.3V PLL CLK-DRVR 24-TSSOP	0
CDCVF2505DR Texas Instruments	IC 3.3V PLL CLOCK DRVR 8-SOIC	4675000
LMK04102SQ/NOPB Texas Instruments	IC CLOCK COND W/PLL 48WQFN	0
LMK04610RTQT Texas Instruments	LMK04610 ULTRA LOW-NOISE AND LOW	2192
LMX2592RHAT Texas Instruments	IC PLL FREQ SYNTH W/VCO 40VQFN	1263
TRF3761-DIRHAR Texas Instruments	PLL FREQUENCY SYNTHESIZER	10000
LMK03806BISQX/NOPB Texas Instruments	IC CLK GENERATOR PROG 64WQFN	0
LMK03000ISQX/NOPB Texas Instruments	CLOCK GENERATOR, 800MHZ, CMOS	0
LMX2430TMX/NOPB Texas Instruments	LMX2430 3.0 GHZ/0.8 GHZ PLLATINU	15000
CD74HC4046APWRE4 Texas Instruments	IC PLL W/VCO 16-TSSOP	0
CDCVF2510APWR Texas Instruments	CDCVF2510A 3.3-V PHASE-LOCK LOOP	693
CDCV857BIDGGR Texas Instruments	PLL CLOCK DRIVER	5280

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.