NXP Semiconductors Phase Locked Loops (PLL) & Frequency Synthesis Circuits 407

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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	Maximum Negative Supply Voltage (Vsup)	Nominal Negative Supply Voltage (Vsup)	Nominal Supply Voltage (Vsup)	Power Supplies (V)	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	Minimum Negative Supply Voltage (Vsup)	JESD-609 Code	Maximum Time At Peak Reflow Temperature (s)	Peak Reflow Temperature (C)	Length
TDA8735	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	16	DIP	RECTANGULAR	NO	PLASTIC/EPOXY		1			THROUGH-HOLE			5 V		IN-LINE			2.54 mm	85 Cel	-30 Cel	TIN/NICKEL PALLADIUM GOLD	DUAL	R-PDIP-T16		5.5 V	4.7 mm	7.62 mm	Not Qualified	4.5 V	ADDL SPLY OF 4.5V TO 12V REQD, SELECTABLE 3/4 PRESCALER; 2-BIT SWALLOW COUNTER		e3/e4			21.6 mm
SA8025DK-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	LSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	BICMOS		GULL WING			5 V		SMALL OUTLINE, LOW PROFILE, SHRINK PITCH			.65 mm	85 Cel	-40 Cel		DUAL	R-PDSO-G20		5.5 V	1.7 mm	4.4 mm	Not Qualified	2.7 V	SELECTABLE 64/65/68/73 PRESCALER					6.575 mm
5962-9458201MRA	NXP Semiconductors	PHASE LOCKED LOOP																													Not Qualified
UMA1020M	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	20	LSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	BICMOS		GULL WING			5 V		SMALL OUTLINE, LOW PROFILE, SHRINK PITCH			.65 mm	85 Cel	-30 Cel		DUAL	R-PDSO-G20		5.5 V	1.5 mm	4.4 mm	Not Qualified	2.7 V						6.5 mm
NE565D	NXP Semiconductors	PHASE LOCKED LOOP	COMMERCIAL	14	SOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	BIPOLAR		GULL WING			6 V		SMALL OUTLINE			1.27 mm	70 Cel	0 Cel		DUAL	R-PDSO-G14		12 V	1.75 mm	3.9 mm	Not Qualified	6 V	ALSO REQUIRES -6V TO -12V SUPPLY					8.65 mm
SA8016-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	16	TSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	BICMOS		GULL WING			3 V		SMALL OUTLINE, THIN PROFILE, SHRINK PITCH			.65 mm	85 Cel	-40 Cel		DUAL	R-PDSO-G16		5.5 V	1.1 mm	4.4 mm	Not Qualified	2.7 V						5 mm
568A/BLA	NXP Semiconductors	PHASE LOCKED LOOP	MILITARY	20	DIP	RECTANGULAR	NO	CERAMIC, METAL-SEALED COFIRED	70 mA	1			THROUGH-HOLE			5 V		IN-LINE				125 Cel	-55 Cel	TIN/NICKEL PALLADIUM GOLD	DUAL	R-CDIP-T20		5.5 V			Not Qualified	4.5 V			e3/e4
SE567FE	NXP Semiconductors	PHASE LOCKED LOOP	MILITARY	8	DIP	RECTANGULAR	NO	CERAMIC, GLASS-SEALED		1	BIPOLAR		THROUGH-HOLE			5 V		IN-LINE			2.54 mm	125 Cel	-55 Cel		DUAL	R-GDIP-T8		9 V	5.08 mm	7.62 mm	Not Qualified	4.75 V						9.955 mm
568A/BRA	NXP Semiconductors	PHASE LOCKED LOOP	MILITARY	20	DIP	RECTANGULAR	NO	CERAMIC, GLASS-SEALED		1			THROUGH-HOLE			5 V		IN-LINE			2.54 mm	125 Cel	-55 Cel		DUAL	R-GDIP-T20		5.5 V	5.08 mm	7.62 mm	Not Qualified	4.5 V
TSA5527AT	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	16	SOP	RECTANGULAR	YES	PLASTIC/EPOXY		1			GULL WING			5 V		SMALL OUTLINE			1.27 mm	85 Cel	-20 Cel	NICKEL PALLADIUM GOLD	DUAL	R-PDSO-G16		5.5 V	1.75 mm	3.9 mm	Not Qualified	4.5 V	ALSO REQUIRES 4.5V TO 13.5V SUPPLY		e4			9.9 mm
TSA5520MDK-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	16	LSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1			GULL WING			5 V		SMALL OUTLINE, LOW PROFILE, SHRINK PITCH			.65 mm	85 Cel	-20 Cel		DUAL	R-PDSO-G16		5.5 V	1.5 mm	4.4 mm	Not Qualified	4.5 V	ALSO REQUIRES 4.5V TO 13.5V SUPPLY					5.2 mm
TDD1742TD-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	28	SOP	RECTANGULAR	YES	PLASTIC/EPOXY	1.5 mA	1	CMOS		GULL WING			7.4 V		SMALL OUTLINE			1.27 mm	85 Cel	-40 Cel		DUAL	R-PDSO-G28		10 V	2.65 mm	7.5 mm	Not Qualified	7 V						17.9 mm
5962-9231301MXA	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	MILITARY	28	DIP	RECTANGULAR	NO	CERAMIC, GLASS-SEALED		1		MIL-STD-883	THROUGH-HOLE			5 V		IN-LINE				125 Cel	-55 Cel		DUAL	R-GDIP-T28		9 V				3 V
SA8028W,518	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	24	HVBCC	SQUARE	YES	PLASTIC/EPOXY		1	BICMOS		BUTT			3 V		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel		BOTTOM	S-PBCC-B24		3.6 V	.8 mm	4 mm	Not Qualified	2.7 V				NOT SPECIFIED	NOT SPECIFIED	4 mm
UMA1019AM	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	20	LSSOP	RECTANGULAR	YES	PLASTIC/EPOXY	11 mA	1	BICMOS		GULL WING			5 V	3/5	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH	SSOP20,.25	PLL or Frequency Synthesis Circuits	.65 mm	85 Cel	-30 Cel		DUAL	R-PDSO-G20		5.5 V	1.5 mm	4.4 mm	Not Qualified	2.7 V						6.5 mm
TSA5514T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	COMMERCIAL EXTENDED	16	SOP	RECTANGULAR	YES	PLASTIC/EPOXY		1			GULL WING			5 V		SMALL OUTLINE			1.27 mm	80 Cel	-10 Cel		DUAL	R-PDSO-G16		5.5 V	1.75 mm	3.9 mm	Not Qualified	4.5 V						9.9 mm
SA8027DH	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	TSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	BICMOS		GULL WING			3 V	3.3	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	TSSOP20,.25	PLL or Frequency Synthesis Circuits	.65 mm	85 Cel	-40 Cel	Nickel/Palladium/Gold (Ni/Pd/Au)	DUAL	R-PDSO-G20		3.6 V	1.1 mm	4.4 mm	Not Qualified	2.7 V			e4	40	260	6.5 mm
SA567N	NXP Semiconductors	PHASE LOCKED LOOP		8	DIP	RECTANGULAR	NO	PLASTIC/EPOXY		1			THROUGH-HOLE					IN-LINE			2.54 mm				DUAL	R-PDIP-T8			4.2 mm	7.62 mm	Not Qualified							9.5 mm
SA7016DH-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	16	TSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	BICMOS		GULL WING			3 V		SMALL OUTLINE, THIN PROFILE, SHRINK PITCH			.65 mm	85 Cel	-40 Cel		DUAL	R-PDSO-G16		5.5 V	1.1 mm	4.4 mm	Not Qualified	2.7 V						5 mm
UMA1017M-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	20	LSSOP	RECTANGULAR	YES	PLASTIC/EPOXY	8.5 mA	1	BICMOS		GULL WING			5 V		SMALL OUTLINE, LOW PROFILE, SHRINK PITCH			.65 mm	85 Cel	-30 Cel		DUAL	R-PDSO-G20		5.5 V	1.5 mm	4.4 mm	Not Qualified	2.7 V						6.5 mm
TSA5060ATS/C1,118	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	16	LSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1			GULL WING			5 V		SMALL OUTLINE, LOW PROFILE, SHRINK PITCH			.65 mm	85 Cel	-20 Cel		DUAL	R-PDSO-G16		5.5 V	1.5 mm	4.4 mm	Not Qualified	4.5 V				40	260	5.2 mm
NE564D-T	NXP Semiconductors	PHASE LOCKED LOOP	COMMERCIAL	16	SOP	RECTANGULAR	YES	PLASTIC/EPOXY	60 mA	1	BIPOLAR		GULL WING			5 V		SMALL OUTLINE			1.27 mm	70 Cel	0 Cel		DUAL	R-PDSO-G16			1.93 mm	3.9 mm	Not Qualified							9.9 mm
SE567FESIIA	NXP Semiconductors		MILITARY	8	DIP	RECTANGULAR	NO	CERAMIC			BIPOLAR		THROUGH-HOLE			5 V	5	IN-LINE	DIP8,.3	PLL or Frequency Synthesis Circuits	2.54 mm	125 Cel	-55 Cel		DUAL	R-XDIP-T8					Not Qualified
TSA5522TD-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	16	SOP	RECTANGULAR	YES	PLASTIC/EPOXY	30 mA	1			GULL WING			5 V		SMALL OUTLINE			1.27 mm	85 Cel	-20 Cel		DUAL	R-PDSO-G16		5.5 V	1.75 mm	3.9 mm	Not Qualified	4.5 V	ADDITIONAL DIVIDE BY 8 PRESCALER					9.9 mm
933372900653	NXP Semiconductors	PHASE LOCKED LOOP	INDUSTRIAL	16	SOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	CMOS		GULL WING					SMALL OUTLINE			1.27 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD	DUAL	R-PDSO-G16	1	15 V	1.75 mm	3.9 mm	Not Qualified	3 V			e4			9.9 mm
UMA1014M	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	LSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	BIPOLAR		GULL WING			5 V		SMALL OUTLINE, LOW PROFILE, SHRINK PITCH			.65 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD	DUAL	R-PDSO-G20		5.5 V	1.5 mm	4.4 mm	Not Qualified	4.5 V	5-BIT AUXILIARY INPUT COUNTER; SELECTABLE 31/32 PRESCALER		e4			6.575 mm
SA7026DK	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	TSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	BICMOS		GULL WING			3 V		SMALL OUTLINE, THIN PROFILE, SHRINK PITCH			.65 mm	85 Cel	-40 Cel		DUAL	R-PDSO-G20		5.5 V	1.1 mm	4.4 mm	Not Qualified	2.7 V						6.5 mm
SA8027W	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	24	HVQCCN	SQUARE	YES	PLASTIC/EPOXY		1	BICMOS		NO LEAD			3 V	3.3	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	LCC24,.16SQ,20	PLL or Frequency Synthesis Circuits	.5 mm	85 Cel	-40 Cel		QUAD	S-PQCC-N24		3.6 V	.8 mm	4 mm	Not Qualified	2.7 V						4 mm
UMA1005T-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	20	LSSOP	RECTANGULAR	YES	PLASTIC/EPOXY	5 mA	1	CMOS		GULL WING			5 V		SMALL OUTLINE, LOW PROFILE, SHRINK PITCH			.65 mm	70 Cel	-40 Cel		DUAL	R-PDSO-G20		5.5 V	1.5 mm	4.4 mm	Not Qualified	2.9 V						6.5 mm
SE567DSIIB	NXP Semiconductors		MILITARY	8	SOP	RECTANGULAR	YES	PLASTIC/EPOXY			BIPOLAR		GULL WING			5 V	5	SMALL OUTLINE	SOP8,.25	PLL or Frequency Synthesis Circuits	1.27 mm	125 Cel	-55 Cel		DUAL	R-PDSO-G8
TSA5526AT	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	16	SOP	RECTANGULAR	YES	PLASTIC/EPOXY		1			GULL WING			5 V		SMALL OUTLINE			1.27 mm	85 Cel	-20 Cel	NICKEL PALLADIUM GOLD	DUAL	R-PDSO-G16		5.5 V	1.75 mm	3.9 mm	Not Qualified	4.5 V	ALSO REQUIRES 4.5V TO 13.5V SUPPLY		e4			9.9 mm
MCH1214OD	NXP Semiconductors	PHASE DETECTOR	OTHER	8	SOP	RECTANGULAR	YES	PLASTIC/EPOXY	52 mA	1			GULL WING	-5.5 V	-5.2 V			SMALL OUTLINE	SOP8,.25		1.27 mm	70 Cel	-40 Cel		DUAL	R-PDSO-G8			1.75 mm	3.9 mm				-4.75 V				4.9 mm
NE565N	NXP Semiconductors	PHASE LOCKED LOOP	COMMERCIAL	14	DIP	RECTANGULAR	NO	PLASTIC/EPOXY		1	BIPOLAR		THROUGH-HOLE			6 V		IN-LINE			2.54 mm	70 Cel	0 Cel		DUAL	R-PDIP-T14		12 V	4.2 mm	7.62 mm	Not Qualified	6 V	ALSO REQUIRES -6V TO -12V SUPPLY					19.025 mm
UMA1019M-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	20	LSSOP	RECTANGULAR	YES	PLASTIC/EPOXY	12.5 mA	1	BICMOS		GULL WING			5 V		SMALL OUTLINE, LOW PROFILE, SHRINK PITCH			.65 mm	85 Cel	-30 Cel		DUAL	R-PDSO-G20		5.5 V	1.5 mm	4.4 mm	Not Qualified	2.7 V						6.5 mm
SE567FE-A	NXP Semiconductors		MILITARY	8	DIP	RECTANGULAR	NO	CERAMIC			BIPOLAR		THROUGH-HOLE			5 V	5	IN-LINE	DIP8,.3	PLL or Frequency Synthesis Circuits	2.54 mm	125 Cel	-55 Cel		DUAL	R-XDIP-T8					Not Qualified
TSA5521T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	16	SOP	RECTANGULAR	YES	PLASTIC/EPOXY		1			GULL WING			5 V		SMALL OUTLINE			1.27 mm	85 Cel	-20 Cel		DUAL	R-PDSO-G16		5.5 V	1.75 mm	3.9 mm	Not Qualified	4.5 V	ALSO REQUIRES 4.5V TO 13.5V SUPPLY					9.9 mm
SA7016-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	16	TSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	BICMOS		GULL WING			3 V		SMALL OUTLINE, THIN PROFILE, SHRINK PITCH			.65 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD	DUAL	R-PDSO-G16		5.5 V	1.1 mm	4.4 mm	Not Qualified	2.7 V			e4			5 mm
935196640112	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	COMMERCIAL EXTENDED	18	DIP	RECTANGULAR	NO	PLASTIC/EPOXY		1			THROUGH-HOLE			5 V		IN-LINE			2.54 mm	80 Cel	-10 Cel		DUAL	R-PDIP-T18		5.5 V	4.7 mm	7.62 mm	Not Qualified	4.5 V				40	245	21.6 mm
935268498551	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	24	HBCC	SQUARE	YES	PLASTIC/EPOXY		1	BICMOS		BUTT			3 V		CHIP CARRIER, HEAT SINK/SLUG			.5 mm	85 Cel	-40 Cel		BOTTOM	S-PBCC-B24		3.6 V	.8 mm	4 mm	Not Qualified	2.7 V				40	260	4 mm
935205860118	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	20	LSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1			GULL WING			5 V		SMALL OUTLINE, LOW PROFILE, SHRINK PITCH			.65 mm	85 Cel	-20 Cel		DUAL	R-PDSO-G20		5.5 V	1.5 mm	4.4 mm	Not Qualified	4.5 V						6.5 mm
SE565F	NXP Semiconductors	PHASE LOCKED LOOP	MILITARY	14	DIP	RECTANGULAR	NO	CERAMIC, GLASS-SEALED		1	BIPOLAR		THROUGH-HOLE			6 V		IN-LINE			2.54 mm	125 Cel	-55 Cel		DUAL	R-GDIP-T14		12 V	5.08 mm	7.62 mm	Not Qualified	6 V	ALSO REQUIRES -6V TO -12V SUPPLY					19.535 mm
SA8028DH	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	20	TSSOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	BICMOS		GULL WING			3 V	3/3.3	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	TSSOP20,.25	PLL or Frequency Synthesis Circuits	.65 mm	85 Cel	-40 Cel	NICKEL PALLADIUM GOLD	DUAL	R-PDSO-G20		3.6 V	1.2 mm	4.4 mm	Not Qualified	2.7 V			e4			6.5 mm
SA567FE	NXP Semiconductors	PHASE LOCKED LOOP		8	DIP	RECTANGULAR	NO	CERAMIC, GLASS-SEALED		1			THROUGH-HOLE					IN-LINE			2.54 mm				DUAL	R-GDIP-T8			5.08 mm	7.62 mm	Not Qualified							9.955 mm
TSA6057T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	16	SOP	RECTANGULAR	YES	PLASTIC/EPOXY		1	BIPOLAR		GULL WING			5 V		SMALL OUTLINE			1.27 mm	85 Cel	-30 Cel		DUAL	R-PDSO-G16		5.5 V	2.65 mm	7.5 mm	Not Qualified	4.5 V	4-BIT AUXILIARY INPUT COUNTER					10.3 mm
UMA1020AM-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	OTHER	20	LSSOP	RECTANGULAR	YES	PLASTIC/EPOXY	11 mA	1	BICMOS		GULL WING			5 V		SMALL OUTLINE, LOW PROFILE, SHRINK PITCH			.65 mm	85 Cel	-30 Cel		DUAL	R-PDSO-G20		5.5 V	1.5 mm	4.4 mm	Not Qualified	2.7 V						6.5 mm
SE567FE/883C	NXP Semiconductors		MILITARY	8	DIP	RECTANGULAR	NO	CERAMIC			BIPOLAR	MIL-STD-883 Class C	THROUGH-HOLE			5 V	5	IN-LINE	DIP8,.3	PLL or Frequency Synthesis Circuits	2.54 mm	125 Cel	-55 Cel		DUAL	R-XDIP-T8					Not Qualified
SA8028W-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	INDUSTRIAL	24	HVBCC	SQUARE	YES	PLASTIC/EPOXY		1	BICMOS		BUTT			3 V		CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE			.5 mm	85 Cel	-40 Cel		BOTTOM	S-PBCC-B24	3	3.6 V	.8 mm	4 mm	Not Qualified	2.7 V						4 mm
TSA5515TD-T	NXP Semiconductors	PLL FREQUENCY SYNTHESIZER	COMMERCIAL EXTENDED	14	SOP	RECTANGULAR	YES	PLASTIC/EPOXY		1			GULL WING			5 V		SMALL OUTLINE			1.27 mm	80 Cel	-10 Cel		DUAL	R-PDSO-G14		5.5 V	1.75 mm	3.9 mm	Not Qualified	4.5 V						8.65 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.