Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
CDCM61004RHBR/2801 Texas Instruments	IC CLK GEN 1:4 LOW JITTER 32QFN	0
CDCEL937PWRG4 Texas Instruments	IC 3-PLL VCXO CLK SYNTH 20-TSSOP	0
LMX2594RHAT Texas Instruments	IC PLL CLOCK/FREQ SYNTH 40VQFN	1401
LMX2531LQ1742/NOPB Texas Instruments	IC PLL FREQ SYNTH W/VCO 36WQFN	265
CDCVF25081D Texas Instruments	IC 1:8 3.3V PLL CLK-DRVR 16-SOIC	71
LMX2594RHAR Texas Instruments	IC PLL CLOCK/FREQ SYNTH 40VQFN	0
TRF3761-AIRHAT Texas Instruments	TRF3761-A LOW NOISE INTEGER N PL	12802
CDCE913PWRG4 Texas Instruments	IC PROG PLL VCXO CLK SYN 14TSSOP	0
CDC857-2DGGG4 Texas Instruments	PLL CLOCK DRIVER	20
TLC2934IPWG4 Texas Instruments	IC PHASE LOCK LOOP HP 14-TSSOP	0
CDCVF2505DG4 Texas Instruments	IC 3.3V PLL CLOCK DRVR 8-SOIC	0
CDCVF2509APWG4 Texas Instruments	IC 3.3V PLL CLK-DRVR 24-TSSOP	0
CD54HCT4046AF3A Texas Instruments	CD54HCT4046A HIGH SPEED CMOS LOG	4
CDC421A156RGER Texas Instruments	IC CLK GEN 156.25MHZ 3.3V 24VQFN	0
CDC2509BPWRG4 Texas Instruments	IC 3.3V PLL CLK-DRVR 24-TSSOP	0
CDCV855PW Texas Instruments	CDCV855 1:4 DDR PLL CLOCK DRIVER	12039
LMX2541SQ3320E/NOPB Texas Instruments	IC PLL FREQ SYNTH W/VCO 36WQFN	1053
LMC568CM/NOPB Texas Instruments	PHASE LOCKED LOOP, CMOS, PDSO8	0
CDC2510CPWG4 Texas Instruments	PLL CLOCK DRIVER	129
SN74LV4046APW Texas Instruments	IC PLL CMOS LOGC W/VCO HS16TSSOP	985

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.