Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
CDCF5801DBQG4 Texas Instruments	IC PLL CLOCK MULTIPLIER 24-QSOP	0
CDCVF2505PWR Texas Instruments	IC 3.3V PLL CLOCK DRVR 8-TSSOP	2094
CDCV857DGG Texas Instruments	PLL CLOCK DRIVER	23215
CDC2510BPWRG4 Texas Instruments	IC 3.3V PLL CLK-DRVR 24-TSSOP	0
CDCI6214RGET Texas Instruments	IC CLOCK GENERATOR 24VQFN	1066
CDC421A100RGER Texas Instruments	IC CLK GEN 100.00MHZ 3.3V 24VQFN	0
CD4046BPW Texas Instruments	IC PHASE-LOCK LOOP MCPWR 16TSSOP	48
LMX2531LQ2820E/NOPB Texas Instruments	IC PLL FREQ SYNTH W/VCO 36WQFN	0
CDC9842DW Texas Instruments	CLOCK GENERATOR	3695
LMK03200ISQE/NOPB Texas Instruments	IC CLOCK CONDITIONER PREC 48WQFN	0
CDCVF25081PWRG4 Texas Instruments	IC 1:8 3.3V PLL CLK-DRVR 16TSSOP	0
LMX2571NJKR Texas Instruments	IC SYNTHESIZER W/FSK MOD 36WQFN	0
CDCVF857DGGR Texas Instruments	CDCVF857 2.5 V PHASE LOCK LOOP D	55791
CDCVF855PW Texas Instruments	IC PLL CLOCK DVR 2.5V 28-TSSOP	178
LMK04803BISQE/NOPB Texas Instruments	IC CLOCK DUAL PLL 64WQFN	300
CD74HC4046ANSRE4 Texas Instruments	IC PLL W/VCO 16SO	0
CDCVF857DGGG4 Texas Instruments	IC 2.5V PHASE LOCK LOOP 48-TSSOP	0
CDCS502PWR Texas Instruments	IC OSC CLOCK GENERATOR 8-TSSOP	0
CDCE813QPWRQ1 Texas Instruments	IC PROG CLOCK SYNTH 14TSSOP	1427
LMK04001BISQE/NOPB Texas Instruments	IC CLOCK COND 1.5GHZ W/PLL 48QFN	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.