Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
ADF4212LBCPZ-RL7 Analog Devices, Inc.	IC PLL FREQ SYNTHESIZER 20LFCSP	0
ADF4252BCPZ-RL Analog Devices, Inc.	IC PLL FREQ SYNTHESIZER 24LFCSP	0
MAX9485ETP Analog Devices, Inc.	AUDIO CLOCK GENERATOR	5952
DS1091LUB-033+ Analog Devices, Inc.	DS1091 AUTOMOTIVE TEMPERATURE RA	2250
ADF4156BCPZ-RL7 Analog Devices, Inc.	IC PLL FRAC-N FREQ SYNTH 20LFCSP	677
ADF4002BCPZ-RL7 Analog Devices, Inc.	IC PLL FREQUENCY SYNTH 20-LFCSP	1331
HMC807LP6CETR Analog Devices, Inc.	IC PLL W/VCO FRACTIONAL-N 40SMD	379
ADF5000BCPZ Analog Devices, Inc.	IC PRESCALER 18GHZ 16LFCSP	369
HMC838LP6CETR Analog Devices, Inc.	IC PLL W/VCO FRACTIONAL-N 40-QFN	500
ADF4106BCPZ-R7 Analog Devices, Inc.	IC PLL FREQ SYNTHESIZER 20LFCSP	4069
ADF4007BCPZ-RL7 Analog Devices, Inc.	IC DIVIDER/PLL SYNTHESZR 20LFCSP	0
AD9518-0BCPZ Analog Devices, Inc.	CLOCK DRIVER, 9518 SERIES	5058
MAX9383EUA Analog Devices, Inc.	PHASE-FREQUENCY DETECTOR	6948
MAX9491ETP045+T Analog Devices, Inc.	MAX9491 FACTORY-PROGRAMMABLE, SI	45000
ADF4152HVBCPZ Analog Devices, Inc.	IC FRACTION-N FREQ SYNTH 32LFCSP	0
LTC6945IUFD#PBF Analog Devices, Inc.	IC SYNTHESIZER INTEGER N 28QFN	809
ADF4153WYRUZ-RL7 Analog Devices, Inc.	PLL FREQUENCY SYNTHESIZER	26829
ADF4116BRUZ Analog Devices, Inc.	IC SYNTH PLL RF 550MHZ 16-TSSOP	4534
ADF4360-2BCPRL7 Analog Devices, Inc.	PHASE LOCKED LOOP WITH VCO	3000
ADF4117BRU Analog Devices, Inc.	PLL FREQUENCY SYNTHESIZER	249

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.