Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
CDC2509BPW Texas Instruments	PLL CLOCK DRIVER	15250
CDCS501PWR Texas Instruments	IC CLOCK GEN/BUFFER SSC 8TSSOP	324
CDCE72010RGCR Texas Instruments	CDCE72010 10 OUTPUTS LOW JITTER	1760
CDCEL913PW Texas Instruments	IC 1-PLL VCXO CLK SYNTH 14-TSSOP	296
CD74HC7046AE Texas Instruments	PHASE LOCKED LOOP, CMOS, PDIP16	8015
LMX2491RTWT Texas Instruments	IC FREQUENCY SYNTH 24WQFN	166
CD74HC297EG4 Texas Instruments	IC DIGITAL PHASE-LOCKD LOOP 16-D	0
TLC2934IPW Texas Instruments	PHASE LOCKED LOOP, PDSO14	11387
PLL1708DBQR Texas Instruments	PLL1708 3.3 V DUAL PLL MULTI-CLO	43595
LMK03033CISQE/NOPB Texas Instruments	IC CLOCK CONDITIONER PREC 48WQFN	139
LMX2487ESQ/NOPB Texas Instruments	IC SYNTHESIZER PLL DUAL 24WQFN	0
LMK04610RTQR Texas Instruments	IC JITTER CLEANER 56QFN	2000
LMK04816BISQ/NOPB Texas Instruments	IC CLOCK DUAL PLL 64WQFN	0
TLC2932IPWR Texas Instruments	PHASE LOCKED LOOP, PDSO14	2000
CDC9841DW Texas Instruments	CLOCK GENERATOR	2098
CDCM6208V1RGZR Texas Instruments	IC CLK GEN 2:8 LOW JITTER 48VQFN	357
CDCVF855PWG4 Texas Instruments	IC PLL CLOCK DVR 2.5V 28-TSSOP	0
CDCV855IPWG4 Texas Instruments	IC PLL CLOCK DRVR 2.5V 28TSSOP	0
LMK04010BISQX/NOPB Texas Instruments	LMK04010 LOW-NOISE CLOCK JITTER	5000
LMK05028RGCT Texas Instruments	DPLL	305

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.