HVQCCN Phase Locked Loops (PLL) & Frequency Synthesis Circuits 89

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Part	Manufacturer	Other IC type	Temperature Grade	No. of Terminals	Package Code	Package Shape	Surface Mount	Package Body Material	Maximum Supply Current (Isup)	No. of Functions	Technology	Screening Level	Terminal Form	Nominal Supply Voltage (Vsup)	Power Supplies (V)	Maximum Output Frequency	Package Style (Meter)	Package Equivalence Code	Sub-Category	Terminal Pitch	Maximum Operating Temperature	Minimum Operating Temperature	Terminal Finish	Terminal Position	JESD-30 Code	Moisture Sensitivity Level (MSL)	Maximum Supply Voltage (Vsup)	Maximum Seated Height	Width (mm)	Qualification	Minimum Supply Voltage (Vsup)	Additional Features	JESD-609 Code	Maximum Time At Peak Reflow Temperature (s)	Peak Reflow Temperature (C)	Length
ADF4153YCPZ	Analog Devices	PLL FREQUENCY SYNTHESIZER	AUTOMOTIVE	20	HVQCCN	SQUARE	YES	UNSPECIFIED	24 mA	1	BICMOS		NO LEAD	3 V	3,3/5.5		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC20,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	125 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N20	3	3.3 V	1 mm	4 mm	Not Qualified	2.7 V		e3	30	260	4 mm
ADF4350BCPZ-RL7	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	32	HVQCCN	SQUARE	YES	UNSPECIFIED	27 mA	1	BICMOS		NO LEAD	3.3 V	3.3		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC32,.2SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N32	3	3.6 V	1 mm	5 mm	Not Qualified	3 V		e3	30	260	5 mm
ADF4350BCPZ	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	32	HVQCCN	SQUARE	YES	UNSPECIFIED	27 mA	1	BICMOS		NO LEAD	3.3 V	3.3		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC32,.2SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N32	3	3.6 V	1 mm	5 mm	Not Qualified	3 V		e3	30	260	5 mm
TRF3750IRGPR	Texas Instruments	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1	CMOS		NO LEAD	3.3 V	3.3/5		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC20,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD	QUAD	S-PQCC-N20	2	3.6 V	1 mm	4 mm	Not Qualified	3 V	CAN ALSO OPERATE WITH 5V SUPPLY, DUAL MODULUS PRESCALER : 8/9, 16/17, 32/33, 64/65	e4	30	260	4 mm
ADF4106BCPZ	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	HVQCCN	SQUARE	YES	UNSPECIFIED	11 mA	1	CMOS		NO LEAD	3 V	3		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC20,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N20	3	3.3 V	1 mm	4 mm	Not Qualified	2.7 V		e3		260	4 mm
ADF4153BCPZ	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	HVQCCN	SQUARE	YES	UNSPECIFIED	24 mA	1	CMOS		NO LEAD	3 V	3,3/5.5		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC20,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N20	3	3.3 V	1 mm	4 mm	Not Qualified	2.7 V		e3		260	4 mm
ADF4154BCPZ	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	HVQCCN	SQUARE	YES	UNSPECIFIED	24 mA	1	CMOS		NO LEAD	3 V	3,3/5.5		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC20,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N20	3	3.3 V	1 mm	4 mm	Not Qualified	2.7 V		e3		260	4 mm
ADF4193BCPZ-RL	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	32	HVQCCN	SQUARE	YES	UNSPECIFIED	27 mA	1	BICMOS		NO LEAD	3 V	3		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC32,.2SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N32	3	3.3 V	1 mm	5 mm	Not Qualified	2.7 V		e3		260	5 mm
ADF4193BCPZ	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	32	HVQCCN	SQUARE	YES	UNSPECIFIED	27 mA	1	BICMOS		NO LEAD	3 V	3		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC32,.2SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N32	3	3.3 V	1 mm	5 mm	Not Qualified	2.7 V		e3		260	5 mm
ADF4107BCPZ-REEL7	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	HVQCCN	SQUARE	YES	UNSPECIFIED		1			NO LEAD	3 V	3/5		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC20,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N20	3	3.3 V	1 mm	4 mm	Not Qualified	2.7 V		e3		260	4 mm
ADF4107BCPZ-REEL	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	HVQCCN	SQUARE	YES	UNSPECIFIED		1			NO LEAD	3 V	3/5		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC20,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N20	3	3.3 V	1 mm	4 mm	Not Qualified	2.7 V		e3		260	4 mm
ADF4212LBCPZ	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	HVQCCN	SQUARE	YES	UNSPECIFIED	10 mA	1	CMOS		NO LEAD	3 V	3		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC20,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N20	3	3.3 V	1 mm	4 mm	Not Qualified	2.7 V		e3		260	4 mm
ADF4153BCPZ-RL7	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	HVQCCN	SQUARE	YES	UNSPECIFIED	24 mA	1	CMOS		NO LEAD	3 V	3,3/5.5		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC20,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N20	3	3.3 V	1 mm	4 mm	Not Qualified	2.7 V		e3		260	4 mm
ADF4153BCPZ-RL	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	HVQCCN	SQUARE	YES	UNSPECIFIED	24 mA	1	CMOS		NO LEAD	3 V	3,3/5.5		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC20,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N20	3	3.3 V	1 mm	4 mm	Not Qualified	2.7 V		e3		260	4 mm
ADF4150BCPZ	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	24	HVQCCN	SQUARE	YES	UNSPECIFIED		1			NO LEAD	3.3 V	3.3,3.3/5		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC24,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N24	3	3.6 V	.8 mm	4 mm	Not Qualified	3 V		e3	30	260	4 mm
ADRF6655ACPZ-R7	Analog Devices	PHASE DETECTOR	INDUSTRIAL	40	HVQCCN	SQUARE	YES	UNSPECIFIED		1	BICMOS		NO LEAD	5 V			CHIP CARRIER			.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N40		5.25 V	1 mm	6 mm	Not Qualified	4.75 V		e3			6 mm
ADF4106BCPZ-RL	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	HVQCCN	SQUARE	YES	UNSPECIFIED	11 mA	1	CMOS		NO LEAD	3 V	3		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC20,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N20	3	3.3 V	1 mm	4 mm	Not Qualified	2.7 V		e3		260	4 mm
AD9574BCPZ-REEL7	Analog Devices	PHASE LOCKED LOOP	INDUSTRIAL	48	HVQCCN	SQUARE	YES	UNSPECIFIED		1			NO LEAD	3.3 V			CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel		QUAD	S-XQCC-N48	3	3.63 V	.8 mm	7 mm		2.97 V			30	260	7 mm
AD9574BCPZ	Analog Devices	PHASE LOCKED LOOP	INDUSTRIAL	48	HVQCCN	SQUARE	YES	UNSPECIFIED		1			NO LEAD	3.3 V			CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel		QUAD	S-XQCC-N48	3	3.63 V	.8 mm	7 mm		2.97 V			30	260	7 mm
ADF4355BCPZ-RL7	Analog Devices	PHASE LOCKED LOOP	INDUSTRIAL	32	HVQCCN	SQUARE	YES	UNSPECIFIED		1			NO LEAD	3.3 V			CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N32	3	3.45 V	.8 mm	5 mm		3.15 V		e3	30	260	5 mm
ADF4169CCPZ-RL7	Analog Devices	PLL FREQUENCY SYNTHESIZER	AUTOMOTIVE	24	HVQCCN	SQUARE	YES	UNSPECIFIED		1			NO LEAD				CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	125 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N24	3	3.45 V	.8 mm	4 mm		2.7 V		e3	30	260	4 mm
ADF4169CCPZ	Analog Devices	PLL FREQUENCY SYNTHESIZER	AUTOMOTIVE	24	HVQCCN	SQUARE	YES	UNSPECIFIED		1			NO LEAD				CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	125 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N24	3	3.45 V	.8 mm	4 mm		2.7 V		e3	30	260	4 mm
ADF4169WCCPZ-RL7	Analog Devices	PLL FREQUENCY SYNTHESIZER	AUTOMOTIVE	24	HVQCCN	SQUARE	YES	UNSPECIFIED		1		AEC-Q100	NO LEAD				CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	125 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N24	3	3.45 V	.8 mm	4 mm		2.7 V		e3	30	260	4 mm
ADF4355-3BCPZ-RL7	Analog Devices	PHASE LOCKED LOOP	INDUSTRIAL	32	HVQCCN	SQUARE	YES	UNSPECIFIED		1	BICMOS		NO LEAD	3.3 V			CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	105 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N32	3	3.4485 V	.8 mm	5 mm		3.1515 V	INPUT FREQUENCY IN SINGLE-ENDED MODE 250MHZ; WHEN DOUBLER ENABLED= 100MHZ	e3	30	260	5 mm
LMX2581ESQE/NOPB	Texas Instruments	PHASE LOCKED LOOP	INDUSTRIAL	32	HVQCCN	SQUARE	YES	PLASTIC/EPOXY					NO LEAD	3.3 V	3.3	3800 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC32,.2SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-PQCC-N32	3		.75 mm	5 mm	Not Qualified			e3	30	260	5 mm
LMX2592RHAR	Texas Instruments	PHASE LOCKED LOOP	INDUSTRIAL	40	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	3.3 V		9800 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD SILVER	QUAD	S-PQCC-N40	3	3.45 V	1 mm	6 mm		3.15 V		e4	30	260	6 mm
LMX2582RHAR	Texas Instruments	PHASE LOCKED LOOP	INDUSTRIAL	40	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	3.3 V		5500 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD SILVER	QUAD	S-PQCC-N40	3	3.45 V	1 mm	6 mm		3.15 V		e4	30	260	6 mm
LMX2582RHAT	Texas Instruments	PHASE LOCKED LOOP	INDUSTRIAL	40	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	3.3 V		5500 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD SILVER	QUAD	S-PQCC-N40	3	3.45 V	1 mm	6 mm		3.15 V		e4	30	260	6 mm
HMC4069LP4E	Analog Devices	PHASE DETECTOR	INDUSTRIAL	24	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	5 V			CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel		QUAD	S-PQCC-N24		5.25 V	1 mm	4 mm		4.75 V			NOT SPECIFIED	NOT SPECIFIED	4 mm
HMC4069LP4ETR	Analog Devices	PHASE DETECTOR	INDUSTRIAL	24	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	5 V			CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel		QUAD	S-PQCC-N24		5.25 V	1 mm	4 mm		4.75 V			NOT SPECIFIED	NOT SPECIFIED	4 mm
ADF4152HVBCPZ	Analog Devices	PHASE LOCKED LOOP	INDUSTRIAL	32	HVQCCN	SQUARE	YES	UNSPECIFIED		1	BICMOS		NO LEAD	3.3 V			CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel		QUAD	S-XQCC-N32	3	3.6 V	.8 mm	5 mm		3 V			30	260	5 mm
ADF4356BCPZ-RL7	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	32	HVQCCN	SQUARE	YES	UNSPECIFIED		1			NO LEAD	3.3 V			CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N32	3	3.45 V	.8 mm	5 mm		3.15 V	ADD COUNT R-1 TO 1023 AND N COUNTER FOR PRESCALER 4/5-23 TO 32767	e3	30	260	5 mm
ADF4356BCPZ	Analog Devices	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	32	HVQCCN	SQUARE	YES	UNSPECIFIED		1			NO LEAD	3.3 V			CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-XQCC-N32	3	3.45 V	.8 mm	5 mm		3.15 V	ADD COUNT R-1 TO 1023 AND N COUNTER FOR PRESCALER 4/5-23 TO 32767	e3	30	260	5 mm
LMX2491RTWT	Texas Instruments	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	24	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	3.3 V		6400 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel	MATTE TIN	QUAD	S-PQCC-N24	3	3.45 V	.8 mm	4 mm		3.15 V		e3	30	260	4 mm
LMX2594RHAR	Texas Instruments	PHASE LOCKED LOOP	INDUSTRIAL	40	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	3.3 V		15000 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD SILVER	QUAD	S-PQCC-N40	3	3.45 V	1 mm	6 mm		3.15 V		e4	30	260	6 mm
LMX2595RHAR	Texas Instruments	PHASE LOCKED LOOP	INDUSTRIAL	40	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	3.3 V		19000 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD SILVER	QUAD	S-PQCC-N40	3	3.45 V	1 mm	6 mm		3.15 V		e4	30	260	6 mm
LMX2572RHAR	Texas Instruments	PHASE LOCKED LOOP	INDUSTRIAL	40	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	3.3 V		6400 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD	QUAD	S-PQCC-N40	3	3.5 V	1 mm	6 mm		3 V		e4	30	260	6 mm
LMX2694SRTCTEP	Texas Instruments	PLL FREQUENCY SYNTHESIZER	MILITARY	48	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	3.3 V		15100 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC48,.27SQ,20		.5 mm	125 Cel	-55 Cel	NICKEL PALLADIUM GOLD SILVER	QUAD	S-PQCC-N48	3	3.45 V	.9 mm	7 mm		3.2 V		e4	30	260	7 mm
LMX2820RTCR	Texas Instruments	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	48	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	3.3 V		22600 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC48,.28SQ,20		.5 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD SILVER	QUAD	S-PQCC-N48	3	3.45 V	.9 mm	7 mm		3.15 V		e4	30	260	7 mm
LMX2820RTCT	Texas Instruments	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	48	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	3.3 V		22600 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC48,.28SQ,20		.5 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD SILVER	QUAD	S-PQCC-N48	3	3.45 V	.9 mm	7 mm		3.15 V		e4	30	260	7 mm
LMX2694SRTCTSEP	Texas Instruments	PLL FREQUENCY SYNTHESIZER	MILITARY	48	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1			NO LEAD	3.3 V		15100 GHz	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC48,.27SQ,20		.5 mm	125 Cel	-55 Cel	NICKEL PALLADIUM GOLD SILVER	QUAD	S-PQCC-N48	3	3.45 V	.9 mm	7 mm		3.2 V		e4	30	260	7 mm

Phase Locked Loops (PLL) & Frequency Synthesis Circuits

Phase Locked Loops (PLL) and Frequency Synthesis Circuits are electronic circuits used to generate and control stable and precise frequencies for use in various applications, such as communication systems, signal processing, and instrumentation.

A PLL is a feedback system that compares the phase of an input signal to the phase of a reference signal and adjusts the output frequency to match the reference frequency. The basic components of a PLL include a phase detector, a low-pass filter, a voltage-controlled oscillator (VCO), and a frequency divider. The phase detector compares the phase of the input and reference signals and generates an error signal that is filtered and used to adjust the frequency of the VCO. The output of the VCO is divided by a frequency divider to generate the output frequency. PLLs are commonly used for frequency synthesis, clock recovery, and phase modulation/demodulation.

Frequency synthesis circuits are electronic circuits used to generate precise and stable frequencies by combining multiple signals with different frequencies. These circuits use various techniques, such as direct digital synthesis (DDS), fractional-N synthesis, and frequency mixing to generate frequencies. DDS is a technique that uses a digital signal generator to generate a waveform with a specific frequency, phase, and amplitude. Fractional-N synthesis is a technique that uses a PLL to generate a frequency that is a fraction of the reference frequency. Frequency mixing is a technique that combines two signals with different frequencies to generate a signal with a frequency equal to the difference between the two frequencies.

PLLs and frequency synthesis circuits are critical components in many electronic systems that require precise and stable frequencies. These circuits are used in communication systems, signal processing, instrumentation, and other applications where accurate frequency generation and control is required.