Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
ADF4113BRUZ-REEL Analog Devices, Inc.	PLL FREQUENCY SYNTHESIZER, BICMO	11732
HMC4069LP4E Analog Devices, Inc.	IC PLL FRACTIONAL-N VCO	465
AD9522-3BCPZ-REEL7 Analog Devices, Inc.	IC CLOCK GEN 2GHZ VCO 64LFCSP	0
ADF4360-3BCPZ Analog Devices, Inc.	IC SYNTHESIZER VCO 24LFCSP	223
ADF5002BCPZ Analog Devices, Inc.	IC PRESCALER 18GHZ 16LFCSP	0
ADF4356BCPZ-RL7 Analog Devices, Inc.	IC SYNTH PLL VCO 6.8GHZ 32LFCSP	0
ADF4252BCP-REEL7 Analog Devices, Inc.	PLL FREQUENCY SYNTHESIZER	1750
MAX31D80T-UGQ+ Analog Devices, Inc.	SPREAD-SPECTRUM CLOCK GENERATOR	592
ADF4157BCPZ-RL7 Analog Devices, Inc.	IC PLL FREQ SYNTH 6GHZ 20LFCSP	0
ADF4360-8BCPRL Analog Devices, Inc.	PHASE LOCKED LOOP WITH VCO	5000
ADF4155BCPZ-RL7 Analog Devices, Inc.	IC PLL FRAC-N FREQ SYNTH 20LFCSP	0
ADF4360-7BCPZRL7 Analog Devices, Inc.	IC SYNTHESIZER VCO 24LFCSP	4477
ADF4153ABCPZ-RL7 Analog Devices, Inc.	IC PLL FREQ SYNTHESIZER 20LFCSP	0
LTC6955IUKG#PBF Analog Devices, Inc.	IC FANOUT BUFFER 52QFN	48
ADF4106BRU-REEL7 Analog Devices, Inc.	PLL FREQUENCY SYNTHESIZER	3000
ADF4108BCPZ-RL Analog Devices, Inc.	IC PLL FREQUENCY SYNTH 20-LFCSP	0
MAX3680AEAI Analog Devices, Inc.	MAX3680 +3.3V, 622 MBPS, SDH/SON	1910
ADF4212LBRUZ-RL7 Analog Devices, Inc.	IC PLL FREQ SYNTHESIZER 20TSSOP	2858
ADF4252BCPZ Analog Devices, Inc.	IC PLL FREQ SYNTHESIZER 24-LFCSP	618
HMC1035LP6GE Analog Devices, Inc.	IC CLOCK GEN 1:1 2.5GHZ 40-SMT	337

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.