Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
CDC536DBG4 Texas Instruments	IC 3.3V PLL CLOCK DRIVER 28-SSOP	0
LMK04906BISQ/NOPB Texas Instruments	IC CLK JITTER CLNR/MULT 64WQFN	0
CDC2510CPWR Texas Instruments	PLL BASED CLOCK DRIVER, 2510 SER	57800
SN74LV4046ADRG4 Texas Instruments	IC LOGIC PLL W/VCO 16-SOIC	0
CDC2516DGGRG4 Texas Instruments	IC 3.3V PLL CLK-DRVR 48-TSSOP	0
CD4046BNSR Texas Instruments	IC PHASE-LOCK LOOP MCPWR 16SO	3370
CDCV857ADGGR Texas Instruments	IC SSTL-II PLL CLK-DRVR 48-TSSOP	2000
CDC509PWR Texas Instruments	CDC509 3.3V PHASE LOCK LOOP CLOC	34000
LMK04102SQX/NOPB Texas Instruments	IC CLOCK COND W/PLL 48WQFN	0
LMX2485QSQX/NOPB Texas Instruments	LMX2485Q-Q1 AUTOMOTIVE DELTA-SIG	9000
CDC421A250RGER Texas Instruments	IC CLK GEN 250.00MHZ 3.3V 24VQFN	0
TRF3765IRHBR Texas Instruments	TRF3765 300M-4800MHZ LOW NOISE I	1321
LMK04616ZCRT Texas Instruments	IC JITTER CLEANER 144NFBGA	0
CDC2509CPWR Texas Instruments	CDC2509C 1-TO-9 PLL CLOCK DRIVER	26459
CDCF5801ADBQR Texas Instruments	IC PLL CLOCK MULTIPLIER 24-QSOP	0
CDCM61001RHBR Texas Instruments	IC CLK GEN 1:1 LOW JITTER 32QFN	805
PLL1700EG Texas Instruments	PLL1700 MULTI-CLOCK GENERATOR	26730
LMC568CMX/NOPB Texas Instruments	PHASE LOCKED LOOP, CMOS, PDSO8	910
SN65LVDS150PWG4 Texas Instruments	IC PLL FREQ MULTIPLIER 28-TSSOP	0
CDC421A250RGET Texas Instruments	CDC421A250 FULLY INTEGRATED FIXE	4750

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.