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LMX2820RTCR
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Texas Instruments Clock Generators, PLLs, Frequency Synthesizers, VQFN-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+86@@ -0,0 +1,86 @@+# LMX2820RTCR++**Texas Instruments** · Clock Generators, PLLs, Frequency Synthesizers · VQFN-48(7x7)++LMX2820RTCR from Texas Instruments, in a VQFN-48(7x7). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | CE | input | Chip Enable. High impedance CMOS input. 1.8V to 3.3V logic. Active HIGH device enable. |+| 2 | GND | power_in | Ground connection. |+| 3 | BIASVCO | passive | VCO bias. Connect low ESR capacitor in 0.47µF to 4.7µF range to ground; 0.47µF for faster calibration, 4.7µF for better in-band phase noise. |+| 4 | GND | power_in | Ground connection. |+| 5 | PSYNC | input | Phase sync input with configurable signal level. Connect 100Ω series resistor to PSYNC signal, or to GND if not used. |+| 6 | GND | power_in | Ground connection. |+| 7 | VCCDIG | power_in | Digital power supply. Connect to 3.3V, add low ESR 0.1µF and 1µF decoupling capacitors to ground. |+| 8 | OSCIN_P | input | Reference input clock (+). High impedance self-biasing pin. AC coupling required. If unused, AC couple through 50Ω resistor to ground. |+| 9 | OSCIN_N | input | Reference input clock (-). High impedance self-biasing pin. AC coupling required. If unused, AC couple through 50Ω resistor to ground. |+| 10 | REGIN | passive | Input reference path regulator decoupling. Connect 1µF decoupling capacitor to ground close to pin; recommend additional low ESR 0.1µF decoupling capacitor for high frequency noise filtering. |+| 11 | SRREQ_P | input | Differential SYSREF input clock (+). Supports AC and DC coupling. |+| 12 | SRREQ_N | input | Differential SYSREF input clock (-). Supports AC and DC coupling. |+| 13 | VCCCP | power_in | Charge pump power supply. Connect to 3.3V, add 1µF decoupling capacitor to ground. |+| 14 | CPOUT | output | Charge pump output. Recommend placing loop filter C1 capacitor close to this pin. |+| 15 | GND | power_in | Ground connection. |+| 16 | GND | power_in | Ground connection. |+| 17 | VCCMASH | power_in | Digital power supply for Σ-Δ modulator. Connect to 3.3V, add low ESR 0.1µF and 1µF decoupling capacitors to ground. |+| 18 | SCK | input | SPI clock. High impedance CMOS input. 1.8V to 3.3V logic. |+| 19 | SDI | input | SPI data. High impedance CMOS input. 1.8V to 3.3V logic. |+| 20 | PFDIN | input | External PFD input. Self-biasing pin. AC coupling and external 50Ω resistor to ground required. |+| 21 | SROUT_P | output | Differential SYSREF output (+). Internal 50Ω pull-up. |+| 22 | SROUT_N | output | Differential SYSREF output (-). Internal 50Ω pull-up. |+| 23 | MUXOUT | output | SPI readback output. 3.3V logic. High impedance when CE = LOW. |+| 24 | VCCBUF | power_in | Output buffer power supply. Connect to 3.3V, add low ESR 0.1µF and 1µF decoupling capacitors to ground. |+| 25 | RFOUTB_N | output | Differential output B (-). Internal 50Ω pull-up. AC coupling required. |+| 26 | RFOUTB_P | output | Differential output B (+). Internal 50Ω pull-up. AC coupling required. |+| 27 | GND | power_in | Ground connection. |+| 28 | RFIN | input | External VCO input. Internal 50Ω termination. AC coupling required. |+| 29 | GND | power_in | Ground connection. |+| 30 | RFOUTA_N | output | Differential output A (-). Internal 50Ω pull-up. AC coupling required. |+| 31 | RFOUTA_P | output | Differential output A (+). Internal 50Ω pull-up. AC coupling required. |+| 32 | GND | power_in | Ground connection. |+| 33 | VCCBUF2 | power_in | Buffer power supply. Connect to 3.3V, add low ESR 0.1µF and 1µF decoupling capacitors to ground. |+| 34 | BIASVCO2 | passive | VCO bias. Connect 1µF decoupling capacitor to ground, placed close to pin. |+| 35 | NC | unconnected | No connection. Pin can be grounded or left unconnected. |+| 36 | REFVCO2 | passive | VCO power supply reference. Connect 1µF decoupling capacitor to ground. |+| 37 | MUTE | input | Buffer mute control. High impedance CMOS input. 1.8V to 3.3V logic. |+| 38 | LD | output | Lock detection output. 3.3V logic. |+| 39 | CS# | input | SPI latch. High impedance CMOS input. 1.8V to 3.3V logic. |+| 40 | GND | power_in | Ground connection. |+| 41 | BIASVAR | passive | VCO varactor bias. Connect 1µF decoupling capacitor to ground. |+| 42 | GND | power_in | Ground connection. |+| 43 | VTUNE | input | VCO tuning voltage input. Connect capacitor ≥1.5nF to VCO ground. |+| 44 | REFVCO | passive | VCO power supply reference. Connect 10µF decoupling capacitor to ground. |+| 45 | VCCVCO | power_in | VCO power supply. Connect to 3.3V, add low ESR 0.1µF and 1µF decoupling capacitors to ground. |+| 46 | REGVCO | passive | VCO regulator node. Connect 1µF decoupling capacitor to ground. |+| 47 | GND | power_in | Ground connection. |+| 48 | GND | power_in | Ground connection. |+| 49 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | VQFN-48(7x7) |+| Category | Clock/Timing |+| Pins | 49 |++## CAD (KiCad official)++- Symbol: `LMX2820RTCR`+- Footprint: `Package_DFN_QFN:QFN-48-1EP_7x7mm_P0.5mm_EP5.15x5.15mm`+- 3D model: VQFN-48(7x7) (KiCad packages3D, STEP)+- 3D model files: `lmx2820rtcr-etched.step` / `lmx2820rtcr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lmx2820rtcr.step` / `lmx2820rtcr.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lmx2820) (42 pp, sha256 `68ac37bbe6ee37a2`, retrieved 2026-10-03, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/lmx2820rtcr-datasheet.pdf)
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Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "clock-timing",+ "lmx2820rtcr",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "lmx2820rtcr.kicad_sym",+ "lmx2820rtcr.kicad_mod",+ "lmx2820rtcr.glb",+ "lmx2820rtcr.step",+ "lmx2820rtcr.lbr",+ "docs/hero.png",+ "docs/lmx2820rtcr-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html",+ "lmx2820rtcr-hero.glb",+ "lmx2820rtcr-hero.overlay.json"+ ],+ "component": {+ "mpn": "LMX2820RTCR",+ "manufacturer": "Texas Instruments",+ "package": "VQFN-48(7x7)",+ "pin_count": 49,+ "category": "Clock/Timing",+ "subcategory": "Clock Generators, PLLs, Frequency Synthesizers",+ "datasheet": "https://www.ti.com/cn/lit/gpn/lmx2820",+ "parts": {+ "symbol": "lmx2820rtcr.kicad_sym",+ "footprint": "lmx2820rtcr.kicad_mod",+ "model_3d": "lmx2820rtcr-hero.glb",+ "model_3d_plain": "lmx2820rtcr.glb",+ "model_3d_step": "lmx2820rtcr-etched.step",+ "model_3d_step_plain": "lmx2820rtcr.step",+ "lbr": "lmx2820rtcr.lbr"+ },+ "distributor_links": {+ "lcsc": 5215031,+ "digikey": "296-LMX2820RTCRTR-ND",+ "mouser": "595-LMX2820RTCR"+ },+ "distributor_check": {+ "checked_at": "2026-10-03T08:10:01Z",+ "source": "Component Ocean /api/assign-pns",+ "digikey": {+ "pn": "296-LMX2820RTCRTR-ND",+ "status": "found",+ "lifecycle": "Active"+ },+ "mouser": {+ "pn": "595-LMX2820RTCR",+ "status": "found"+ }+ },+ "pins": [+ {+ "number": "1",+ "name": "CE",+ "type": "input",+ "description": "Chip Enable. High impedance CMOS input. 1.8V to 3.3V logic. Active HIGH device enable."+ },+ {+ "number": "2",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "3",+ "name": "BIASVCO",+ "type": "passive",+ "description": "VCO bias. Connect low ESR capacitor in 0.47µF to 4.7µF range to ground; 0.47µF for faster calibration, 4.7µF for better in-band phase noise."+ },+ {+ "number": "4",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "5",+ "name": "PSYNC",+ "type": "input",+ "description": "Phase sync input with configurable signal level. Connect 100Ω series resistor to PSYNC signal, or to GND if not used."+ },+ {+ "number": "6",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "7",+ "name": "VCCDIG",+ "type": "power_in",+ "description": "Digital power supply. Connect to 3.3V, add low ESR 0.1µF and 1µF decoupling capacitors to ground."+ },+ {+ "number": "8",+ "name": "OSCIN_P",+ "type": "input",+ "description": "Reference input clock (+). High impedance self-biasing pin. AC coupling required. If unused, AC couple through 50Ω resistor to ground."+ },+ {+ "number": "9",+ "name": "OSCIN_N",+ "type": "input",+ "description": "Reference input clock (-). High impedance self-biasing pin. AC coupling required. If unused, AC couple through 50Ω resistor to ground."+ },+ {+ "number": "10",+ "name": "REGIN",+ "type": "passive",+ "description": "Input reference path regulator decoupling. Connect 1µF decoupling capacitor to ground close to pin; recommend additional low ESR 0.1µF decoupling capacitor for high frequency noise filtering."+ },+ {+ "number": "11",+ "name": "SRREQ_P",+ "type": "input",+ "description": "Differential SYSREF input clock (+). Supports AC and DC coupling."+ },+ {+ "number": "12",+ "name": "SRREQ_N",+ "type": "input",+ "description": "Differential SYSREF input clock (-). Supports AC and DC coupling."+ },+ {+ "number": "13",+ "name": "VCCCP",+ "type": "power_in",+ "description": "Charge pump power supply. Connect to 3.3V, add 1µF decoupling capacitor to ground."+ },+ {+ "number": "14",+ "name": "CPOUT",+ "type": "output",+ "description": "Charge pump output. Recommend placing loop filter C1 capacitor close to this pin."+ },+ {+ "number": "15",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "16",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "17",+ "name": "VCCMASH",+ "type": "power_in",+ "description": "Digital power supply for Σ-Δ modulator. Connect to 3.3V, add low ESR 0.1µF and 1µF decoupling capacitors to ground."+ },+ {+ "number": "18",+ "name": "SCK",+ "type": "input",+ "description": "SPI clock. High impedance CMOS input. 1.8V to 3.3V logic."+ },+ {+ "number": "19",+ "name": "SDI",+ "type": "input",+ "description": "SPI data. High impedance CMOS input. 1.8V to 3.3V logic."+ },+ {+ "number": "20",+ "name": "PFDIN",+ "type": "input",+ "description": "External PFD input. Self-biasing pin. AC coupling and external 50Ω resistor to ground required."+ },+ {+ "number": "21",+ "name": "SROUT_P",+ "type": "output",+ "description": "Differential SYSREF output (+). Internal 50Ω pull-up."+ },+ {+ "number": "22",+ "name": "SROUT_N",+ "type": "output",+ "description": "Differential SYSREF output (-). Internal 50Ω pull-up."+ },+ {+ "number": "23",+ "name": "MUXOUT",+ "type": "output",+ "description": "SPI readback output. 3.3V logic. High impedance when CE = LOW."+ },+ {+ "number": "24",+ "name": "VCCBUF",+ "type": "power_in",+ "description": "Output buffer power supply. Connect to 3.3V, add low ESR 0.1µF and 1µF decoupling capacitors to ground."+ },+ {+ "number": "25",+ "name": "RFOUTB_N",+ "type": "output",+ "description": "Differential output B (-). Internal 50Ω pull-up. AC coupling required."+ },+ {+ "number": "26",+ "name": "RFOUTB_P",+ "type": "output",+ "description": "Differential output B (+). Internal 50Ω pull-up. AC coupling required."+ },+ {+ "number": "27",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "28",+ "name": "RFIN",+ "type": "input",+ "description": "External VCO input. Internal 50Ω termination. AC coupling required."+ },+ {+ "number": "29",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "30",+ "name": "RFOUTA_N",+ "type": "output",+ "description": "Differential output A (-). Internal 50Ω pull-up. AC coupling required."+ },+ {+ "number": "31",+ "name": "RFOUTA_P",+ "type": "output",+ "description": "Differential output A (+). Internal 50Ω pull-up. AC coupling required."+ },+ {+ "number": "32",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "33",+ "name": "VCCBUF2",+ "type": "power_in",+ "description": "Buffer power supply. Connect to 3.3V, add low ESR 0.1µF and 1µF decoupling capacitors to ground."+ },+ {+ "number": "34",+ "name": "BIASVCO2",+ "type": "passive",+ "description": "VCO bias. Connect 1µF decoupling capacitor to ground, placed close to pin."+ },+ {+ "number": "35",+ "name": "NC",+ "type": "unconnected",+ "description": "No connection. Pin can be grounded or left unconnected."+ },+ {+ "number": "36",+ "name": "REFVCO2",+ "type": "passive",+ "description": "VCO power supply reference. Connect 1µF decoupling capacitor to ground."+ },+ {+ "number": "37",+ "name": "MUTE",+ "type": "input",+ "description": "Buffer mute control. High impedance CMOS input. 1.8V to 3.3V logic."+ },+ {+ "number": "38",+ "name": "LD",+ "type": "output",+ "description": "Lock detection output. 3.3V logic."+ },+ {+ "number": "39",+ "name": "CS#",+ "type": "input",+ "description": "SPI latch. High impedance CMOS input. 1.8V to 3.3V logic."+ },+ {+ "number": "40",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "41",+ "name": "BIASVAR",+ "type": "passive",+ "description": "VCO varactor bias. Connect 1µF decoupling capacitor to ground."+ },+ {+ "number": "42",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "43",+ "name": "VTUNE",+ "type": "input",+ "description": "VCO tuning voltage input. Connect capacitor ≥1.5nF to VCO ground."+ },+ {+ "number": "44",+ "name": "REFVCO",+ "type": "passive",+ "description": "VCO power supply reference. Connect 10µF decoupling capacitor to ground."+ },+ {+ "number": "45",+ "name": "VCCVCO",+ "type": "power_in",+ "description": "VCO power supply. Connect to 3.3V, add low ESR 0.1µF and 1µF decoupling capacitors to ground."+ },+ {+ "number": "46",+ "name": "REGVCO",+ "type": "passive",+ "description": "VCO regulator node. Connect 1µF decoupling capacitor to ground."+ },+ {+ "number": "47",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "48",+ "name": "GND",+ "type": "power_in",+ "description": "Ground connection."+ },+ {+ "number": "49",+ "name": "EP",+ "type": "passive",+ "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-haiku-4-5-20251001",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "extractor flagged: DAP (exposed die attach pad) is listed in the pin configuration but does not have a traditional numb",+ "exposed pad 49 added from the footprint",+ "dropped thermal pad ['EP'] absent from footprint"+ ],+ "pages_sent": 33,+ "cost_usd": 0.3105,+ "at": "2026-10-03T08:09:31"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/lmx2820",+ "pages": 42,+ "sha256": "68ac37bbe6ee37a2",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 49,+ "described": 49,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}