Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
SN65LVDS150PW Texas Instruments	IC MUXIT PLL FREQ MULT 28-TSSOP	34
CDC5806PW Texas Instruments	PLL CLOCK DRIVER	11394
TRF3750IRGPR Texas Instruments	PLL FREQUENCY SYNTHESIZER, CMOS	16000
CDCM6208V1FRGZT Texas Instruments	CDCM6208V1F 2:8 ULTRA LOW POWER,	208
CDCE431Y Texas Instruments	CLOCK GENERATOR, 400MHZ, CMOS	1207
LMX2433SLEX/NOPB Texas Instruments	IC FREQ SYNTH DUAL 20LAMUCSP	12173
LMK04000BISQ/NOPB Texas Instruments	IC CLOCK COND W/PLL 48WQFN	0
CD74HCT7046AEG4 Texas Instruments	IC PLL W/VCO/LOCK DETECT 16DIP	0
TMS3450NL Texas Instruments	CLOCK IC, MOS, PDIP28	2000
TRF3765IRHBT Texas Instruments	IC INTEGER-N PLL W/VCO 32QFN	166
CDC536DBR Texas Instruments	CDC536 3.3V PLL CLOCK DRIVER WIT	9443
PLL1700E Texas Instruments	PLL1700 MULTI-CLOCK GENERATOR	9474
LMX2531LQ1415E/NOPB Texas Instruments	IC FREQ SYNTH HI PERF VCO 36WQFN	167
LMK03318RHSR Texas Instruments	IC LO NOISE JITTER CLOCK 48WQFN	20000
CDC421125RGER Texas Instruments	CLOCK GENERATOR	3000
CD74HC4046AM96E4 Texas Instruments	IC PLL W/VCO 16-SOIC	0
LMK04805BISQ/NOPB Texas Instruments	IC CLOCK DUAL PLL 64WQFN	0
LMK04101SQ/NOPB Texas Instruments	CLOCK JITTER CLEANER WITH CASCAD	12000
CDCEL925PWRG4 Texas Instruments	IC 2PLL VCXO CLK SYNTH 16-TSSOP	0
CDC421212RGET Texas Instruments	CLOCK GENERATOR	1250

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.