Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
CD74HC4046APWRG4 Texas Instruments	IC PLL W/VCO 16-TSSOP	0
LMK04001BISQ/NOPB Texas Instruments	IC CLOCK COND W/PLL 48WQFN	0
SN65LVDS150PWR Texas Instruments	SN65LVDS150 MUXIT , PLL FREQUENC	14000
CDC2509PWR Texas Instruments	PLL CLOCK DRIVER	9000
LMX2541SQ2380E/NOPB Texas Instruments	IC PLL FREQ SYNTH W/VCO 36WQFN	136
CDCF5801DBQRG4 Texas Instruments	IC PLL CLOCK MULTIPLIER 24-QSOP	0
LMX2531LQ1500E/NOPB Texas Instruments	IC PLL FREQ SYNTH W/VCO 36WQFN	239
CDCM6208V2RGZR Texas Instruments	IC CLK GEN 2:8 LOW JITTER 48VQFN	2198
CD74HCT7046AMG4 Texas Instruments	IC PLL W/VCO/LOCK DETECT 16SOIC	0
CDCE925PWRG4 Texas Instruments	IC 2PLL PROG VCXO CLK 16-TSSOP	0
CDCF5801ADBQRG4 Texas Instruments	IC PLL CLOCK MULTIPLIER 24-QSOP	0
CDC536DB Texas Instruments	CDC536 3.3V PLL CLOCK DRIVER WIT	17218
CDCEL925PW Texas Instruments	IC 2PLL VCXO CLK SYNTH 16-TSSOP	657
LMX2485QSQ/NOPB Texas Instruments	IC FREQ SYNTH 3GHZ 24WQFN	0
CDC2509CPW Texas Instruments	CDC2509C 1-TO-9 PLL CLOCK DRIVER	5264
CDCV855IPW Texas Instruments	IC 1:4 DDR PLL CLK-DRVR 28-TSSOP	263
CDCE949QPWRQ1 Texas Instruments	CDCE949-Q1 PROGRAMMABLE 4-PLL VC	4733
CD4046BNSRE4 Texas Instruments	CD4046B CMOS MICROPOWER PHASE-LO	989
CDCI6214RGER Texas Instruments	IC CLOCK GENERATOR 24VQFN	1161
CDC5806PWR Texas Instruments	PLL CLOCK DRIVER	24000

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.