Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
2305B-1DCG8 Renesas Electronics America	IC CLK BUFFER ZD 3.3V 8-SOIC	0
NB3N49152MNG	LVPECL OUTPUT CLOCK OSCILLATOR	552
SI5335D-B04844-GMR Silicon Labs	IC 4OUT ANY FREQ <200MHZ 24QFN	0
LMK04033BISQE/NOPB Texas Instruments	IC CLOCK CONDITIONER PREC 48WQFN	616
SI5335C-B06069-GMR Silicon Labs	IC 4OUT ANY FREQ <350MHZ 24QFN	0
SI5335D-B06844-GMR Silicon Labs	IC 4OUT ANY FREQ <200MHZ 24QFN	0
SI5332DD09049-GM1R Silicon Labs	IC CLOCK GENERATOR QFN	0
LMX2541SQ2690E/NOPB Texas Instruments	IC PLL FREQ SYNTH W/VCO 36WQFN	395
8T49N004A-051NLGI Renesas Electronics America	IC CLK GENERATOR LVPECL 32VFQFN	0
CY2308SXI-5H IR (Infineon Technologies)	PLL CLOCK DRIVER	1982
ADF4154BCPZ Analog Devices, Inc.	IC FRACTION-N FREQ SYNTH 20LFCSP	4
SI5350C-B02361-GT Silicon Labs	IC ANY FREQ ANY OUT REF C 10MSOP	0
CS230003-CZZ Cirrus Logic	IC CLK MULT INTERNAL LCO 10MSOP	0
CDC421A106RGET Texas Instruments	CDC421A106 FULLY INTEGRATED FIXE	2500
LMK03001DISQ/NOPB	LMK03001 PRECISION CLOCK CONDITI	1000
SI5335D-B05505-GM Silicon Labs	IC 4OUT ANY FREQ <200MHZ 24QFN	0
SI5335B-B08598-GM Silicon Labs	IC 4OUT ANY FREQ <200MHZ 24QFN	0
CY28322ZC-2 Rochester Electronics	CLOCK GENERATOR	1989
SI5345C-B-GM Silicon Labs	IC CLK BUFFER PLL 64QFN	0
SI5335D-B04014-GM Silicon Labs	IC 4OUT ANY FREQ <200MHZ 24QFN	0

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.