The ADF4251 Fractional-N Synthesizer when combined with a VCO and loop filter forms a complete phased locked loop (PLL). This solution from ADI creates state-of-the-art LO's (local oscillator) for the upconversion and downconversion of RF signals in Wireless applications. The ADF4251 can provide the LO for both RF and IF sections. The RF section incorporates Fractional-N techniques while the IF section uses integer-N techniques. The ADF4251 PLL consists of a low noise digital phase frequency detector (PFD), a precision charge pump, a programmable reference divider, programmable integer registers. Programmable modulus fractional interpolator.

-103dBc/Hz In-band Phase Noise performance for GSM 1800MHz conditions (as an example) is approximately a 15dB improvement over the ADI best Integer-N PLL Phase Noise (ADF4106) and a 10dB improvement over competing F-N PLL products available today. Fractionality will provide for higher PFD reference which will allow wider loop bandwidth for fast lock times. This product is targeted principally at Handset and infrastructure applications requiring low phase noise, fast settling, small channel steps at high output frequencies.

Evaluation board with software is available. There is also a full data sheet with performance graphs. Additionally, the device is featured on ADIsimPLL Synthesizer simulation tool.

Part#	Type	Max RF Input (MHz)	Output Frequency Range	Norm Phase Noise (dBc/Hz)	Max REFin (MHz)	RF Prescalers	Supply Current (max)	Package	Price* (1000-4999)
AD809	Synthesizer	-	155.52 MHz	-219	19.44	-	17	16-Lead SOIC	$3.85
ADF4001	Single Integer-N	200	-	-214	104	n/a	4.5	16-Lead TSSOP, 20-Lead CSP	$1.72
ADF4002	Single Integer-N	400	-	-222	300	n/a	5	16-Lead TSSOP, 20-Lead CSP	$1.97
ADF4007	Single Integer-N	7500	-	-219	240	N counter = 8/16/32/64	13	20-Lead CSP	$2.16
ADF4106	Single Integer-N	6000	-	-219	300	16/17, 32/33, 64/65, 8/9	13	16-Lead TSSOP, 20-Lead CSP	$2.16
ADF4107	Single Integer-N	7000	-	-219	250	16/17, 32/33, 64/65, 8/9	13	16-Lead TSSOP, 20-Lead CSP	$2.67
ADF4108	Single Integer-N	8000	-	-219	250	16/17, 32/33, 4/5, 64/65, 8/9	17	20-Lead CSP	$3.34
ADF4110	Single Integer-N	550	-	-215	104	16/17, 32/33, 64/65, 8/9	4.5	16-Lead TSSOP, 20-Lead CSP	$2.28
ADF4111	Single Integer-N	1200	-	-215	104	16/17, 32/33, 64/65, 8/9	4.5	16-Lead TSSOP, 20-Lead CSP	$2.28
ADF4112	Single Integer-N	3000	-	-215	104	16/17, 32/33, 64/65, 8/9	6.5	16-Lead TSSOP, 20-Lead CSP	$2.28
ADF4113	Single Integer-N	4000	-	-215	104	16/17, 32/33, 64/65, 8/9	8.5	16-Lead TSSOP, 20-Lead CSP	$2.28
ADF4113HV	Single Integer-N	4000	-	-212	104	16/17, 32/33, 64/65, 8/9	11	16-Lead TSSOP, 20-Lead CSP	$2.49
ADF4116	Single Integer-N	550	-	-211	100	8/9	4.5	16-Lead TSSOP	$2.28
ADF4117	Single Integer-N	1200	-	-213	100	32/33	4.5	16-Lead TSSOP	$2.28
ADF4118	Single Integer-N	3000	-	-216	100	32/33	6.5	16-Lead TSSOP	$2.28
ADF4153	Single Fractional-N	4000	-	-213	250	4/5, 8/9	12	16-Lead TSSOP, 20-Lead CSP	$2.28
ADF4154	Single Fractional-N	4000	-	-213	250	4/5, 8/9	12	16-Lead TSSOP, 20-Lead CSP	$2.28
ADF4156	Single Fractional-N	6000	-	-213	250	4/5, 8/9	12	16-Lead TSSOP, 20-Lead CSP	$3.04
ADF4157	Single Fractional-N	6000	-	207	300	-	29	16-Lead TSSOP, 20-Lead CSP	$3.25
ADF4193	Fast Settling PLL	3500	-	-216	300	4/5, 8/9	-	32-Lead CSP	$8.60
ADF4206	Dual Integer-N	550	-	92	40	32/33, 64/65	9.5	16-Lead TSSOP	$2.04
ADF4208	Dual Integer-N	2000	-	91	40	32/33, 64/65	14	20-Lead TSSOP	$2.04
ADF4212	Dual Integer-N	2700	-	91	115	16/17, 32/33, 64/65, 8/9	11.5	20-Lead CSP, 20-Lead TSSOP	$2.45
ADF4212L	Dual Integer-N	2400	-	-215	115	16/17, 32/33, 64/65, 8/9	6	20-Lead CSP, 20-Lead TSSOP	$2.45
ADF4213	-	3000	-	91	115	16/17, 32/33, 8/9	20	-	$1.79
ADF4216	-	1200	-	87	40	32/33, 64/65	18	-	$1.94
ADF4217L	Dual Integer-N	3000	-	90	110	32/33, 64/65	7	20-Lead TSSOP, 24-Lead BCC	-
ADF4218L	Dual Integer-N	3000	-	-216	110	32/33, 64/65	7	20-Lead TSSOP, 24-Lead BCC	$2.54
ADF4219L	Dual Integer-N	3000	-	90	110	32/33, 64/65	7	20-Lead TSSOP, 24-Lead BCC	-
ADF4251	Dual Fractional-N	3000	-	103	150	4/5, 8/9	13	24-Lead CSP	-
ADF4252	Dual Fractional-N	3000	-	-214	150	4/5, 8/9	12	24-Lead CSP	$2.67
ADF4360-0	Synthesizer/VCO Integer-N	-	2400-2725 MHz	-214	250	16/17, 32/33, 8/9	-	24-Lead CSP	$3.10
ADF4360-1	Synthesizer/VCO Integer-N	-	2050-2450 MHz	-217	250	16/17, 32/33, 8/9	-	24-Lead CSP	$3.10
ADF4360-2	Synthesizer/VCO Integer-N	-	1850-2150 MHz	-217	250	16/17, 32/33, 8/9	-	24-Lead CSP	$3.10
ADF4360-3	Synthesizer/VCO Integer-N	-	1600-1950 MHz	-217	250	16/17, 32/33, 8/9	-	24-Lead CSP	$3.10
ADF4360-4	Synthesizer/VCO Integer-N	-	1450-1750 MHz	-217	250	16/17, 32/33, 8/9	-	24-Lead CSP	$3.10
ADF4360-5	Synthesizer/VCO Integer-N	-	1200-1400 MHz	-217	250	16/17, 32/33, 8/9	-	24-Lead CSP	$3.10
ADF4360-6	Synthesizer/VCO Integer-N	-	1050-1250 MHz	-217	250	16/17, 32/33, 8/9	-	24-Lead CSP	$3.10
ADF4360-7	Synthesizer/VCO Integer-N	-	350-1800 MHz	-217	250	16/17, 8/9	-	24-Lead CSP	$3.10
ADF4360-8	Synthesizer/VCO Integer-N	-	65-400 MHz	-217	250	-	-	24-Lead CSP	$3.10
ADF4360-9	Synthesizer/VCO Integer-N	-	1.1-200 MHz	218	250	-	7.5	-	-

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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