Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
CDC516DGGRG4 Texas Instruments	CDC516 3.3V PHASE LOCK LOOP CLOC	1880
LMK04828SNKDTEP Texas Instruments	IC CLOCK GEN EXTEND TEMP 64WQFN	0
CD4046BE Texas Instruments	IC PHASE-LOCK LOOP MCPWR 16-DIP	3436
CDCVF2505D Texas Instruments	IC 3.3V PLL CLOCK DRVR 8-SOIC	1167125
CDCVF2509PW Texas Instruments	CDCVF2509 3.3-V PHASE-LOCK LOOP	24674
SN74LV4046APWG4 Texas Instruments	SN74LV4046A HIGH-SPEED CMOS LOGI	450
CDC7005ZVAT Texas Instruments	CDC7005 HIGH PERFORMANCE, LOW PH	243
CDCM61004RHBT Texas Instruments	IC CLK GEN 1:4 LOW JITTER 32-QFN	1415
LMK04000BISQX/NOPB Texas Instruments	PRECISION CLOCK CONDITIONERS LOW	0
CDCVF855PWRG4 Texas Instruments	IC PLL CLOCK DVR 2.5V 28-TSSOP	0
CDCE62002RHBT Texas Instruments	IC CLK SYNTH/JITTER CLEANR 32QFN	510
CD74HC4046APWT Texas Instruments	IC PLL W/VCO 16-SSOP	1146
CD4046BPWR Texas Instruments	IC PHASE-LOCK LOOP MCPWR 16TSSOP	1893
LMX2592RHAR Texas Instruments	IC PHASE LOCKED LOOPS 40VQFN	0
CDCE62005RGZT Texas Instruments	IC CLK SYNTH/JITTER CLEANR 48QFN	200
CD74ACT297M96 Texas Instruments	IC DGTL PHASE-LOCKED LOOP 16SOIC	0
LMK04011BISQE/NOPB Texas Instruments	IC CLOCK COND W/PLL 48WQFN	0
CDCEL937PW Texas Instruments	IC 3-PLL VCXO CLK SYNTH 20-TSSOP	49
LMK04803BISQ/NOPB Texas Instruments	IC CLOCK DUAL PLL 64WQFN	988
CDC5801ADBQ Texas Instruments	CDC5801A LOW-JITTER CLOCK MULTIP	334

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.