{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC6948IUFD-2#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC6948IUFD-2PBF","canonicalUrl":"https://icboms.com/analog-devices/LTC6948IUFD-2PBF","factsUrl":"https://icboms.com/api/mcp/products/LTC6948IUFD-2%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC6948IUFD-2#PBF, Clock/Frequency Synthesizer (RF/IF), Fractional N, PLL Yes, 1:1 Input:Output, 4.91 GHz max, 3.15V~5.25V supply, -40°C~105°C, 28-WFQFN Exposed Pad, Tube","salesMarkdown":"## Fractional-N synthesizer for RF local oscillators The LTC6948IUFD-2#PBF is a fractional-N PLL frequency synthesizer from Analog Devices, designed for RF/IF local oscillator generation in wireless infrastructure and test equipment. It integrates a phase-locked loop with a voltage-controlled oscillator (VCO) core, delivering a maximum output frequency of 4.91 GHz. The fractional-N architecture allows fine frequency step sizes without requiring a high reference frequency — a practical advantage when the reference is a fixed TCXO or ovenized crystal. ## Wide supply and industrial temperature rating The supply voltage range spans 3.15 V to 5.25 V, covering both 3.3 V and 5 V rails common in baseband and RF boards. The 28-QFN package with exposed pad (4x5 mm) provides a low-inductance ground path for the VCO and PLL charge pump — critical for phase-noise performance above 3 GHz. ## Active production, tube packaging For production quantities, the reel-packaged variant (LTC6948IUFD-2#TRPBF) is the common tape-and-reel alternative — confirm the BOM line's packing specification before ordering. ## Differential I/O and single-circuit PLL Both the input and output are differential, which helps reject common-mode noise on the reference and output paths — important when routing the synthesizer output across a mixed-signal board to a mixer or ADC clock input. The PLL is a single-circuit device with a 1:1 input-to-output ratio, meaning one reference drives one synthesised output. The divider/multiplier block is present on the feedback path to support fractional-N division ratios.","metaTitle":"LTC6948IUFD-2#PBF Analog Devices Clock/Frequency Synthesizer","metaDescription":"LTC6948IUFD-2#PBF from Analog Devices: Fractional-N PLL synthesizer, max 4.91 GHz output, -40°C to 105°C, 28-QFN. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Clock & Timing ICs"],"specifications":{"PLL":"Yes","Type":"Clock/Frequency Synthesizer (RF/IF), Fractional N","Input":"Clock","Output":"Clock","Package":"Tube","Mounting Type":"Surface Mount","Package / Case":"28-WFQFN Exposed Pad","Frequency - Max":"4.91GHz","lifecycle_stage":"eol_hot","Voltage - Supply":"3.15V ~ 5.25V","Divider/Multiplier":"Yes/No","Number of Circuits":"1","Ratio - Input:Output":"1:1","Operating Temperature":"-40°C ~ 105°C","Supplier Device Package":"28-QFN (4x5)","Differential - Input:Output":"Yes/Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$19.09","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$19.09000","currency":"USD"},{"qty":10,"price":"$17.54400","currency":"USD"},{"qty":25,"price":"$16.81640","currency":"USD"},{"qty":100,"price":"$14.81670","currency":"USD"},{"qty":250,"price":"$14.08952","currency":"USD"},{"qty":500,"price":"$13.18050","currency":"USD"}]},"links":{"datasheetUrl":"https://www.analog.com/media/en/technical-documentation/data-sheets/6948fa.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the maximum output frequency of LTC6948IUFD-2#PBF?","answer":"The maximum output frequency is 4.91 GHz. This is the upper limit of the internal VCO range; the actual synthesised frequency depends on the reference frequency and the fractional-N divider settings."},{"question":"What is the difference between LTC6948IUFD-2#PBF and LTC6948IUFD-1#PBF?","answer":"The difference is in the VCO frequency range and divider options. The -2 variant (this part) covers a higher output frequency band up to 4.91 GHz, while the -1 variant targets a lower band. Both share the same 28-QFN footprint and supply range, but the loop filter components and register settings differ. Refer to the datasheet's VCO frequency tables for the exact band split."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC6948IUFD-2PBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LTC6948IUFD-2PBF when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}