Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
CDCE913PWR Texas Instruments	IC PROG PLL VCXO CLK SYN 14TSSOP	1821
CDC950DGG Texas Instruments	PROCESSOR CLOCK GENERATOR	16275
CD74HCT7046AM96 Texas Instruments	IC PLL W/VCO/LOCK DETECT 16SOIC	1489
TRF3761-DIRHAT Texas Instruments	PLL FREQUENCY SYNTHESIZER	41335
CDC857-3DGG Texas Instruments	PLL CLOCK DRIVER	7152
PLL1705DBQ Texas Instruments	IC MLT-CLK GENERATR DUAL 20-QSOP	150
TLC2942IDB Texas Instruments	PHASE LOCKED LOOP, PDSO38	760
CDCVF25081DR Texas Instruments	CDCVF25081 1:8 3.3-V PHASE LOCK	1107
SN74LV4046ANS Texas Instruments	IC PLL CMOS LOGIC W/VCO HS 16SO	543
CDC509PWRG4 Texas Instruments	IC 3.3V PLL CLOCK DRVR 24-TSSOP	0
CDC421106RGET Texas Instruments	CLOCK GENERATOR	3000
CD74HC4046APWR Texas Instruments	IC PLL W/VCO 16-TSSOP	2469
LMK04100SQX/NOPB Texas Instruments	IC CLOCK COND W/PLL 48WQFN	0
LMX2531LQ1778E/NOPB Texas Instruments	IC PLL FREQ SYNTH W/VCO 36WQFN	0
SN74LV4046AN Texas Instruments	SN74LV4046A HIGH-SPEED CMOS LOGI	8310
LMX2531LQ1146E/NOPB Texas Instruments	LMX2531 HIGH PERFORMANCE FREQUEN	7757
CDCM7005ZVAR Texas Instruments	IC CLK SYNC/JITTER CLEANER 64BGA	0
LMX2581ESQX/NOPB Texas Instruments	LMX2581E WIDEBAND FREQUENCY SYNT	26337
LMK03328RHST Texas Instruments	IC CLOCK GENERATOR PLL/VCO	53
LMK04111SQX/NOPB Texas Instruments	IC CLOCK COND W/PLL 48WQFN	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.