component
LMX2820RTCR
Public Made by Adomby adom
Texas Instruments Clock Generators, PLLs, Frequency Synthesizers, VQFN-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "lmx2820rtcr",
"title": "LMX2820RTCR",
"brief": "Texas Instruments Clock Generators, PLLs, Frequency Synthesizers, VQFN-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
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"clock-timing",
"lmx2820rtcr",
"factory-2.0.0",
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"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"
}
},
"metadata": {
"specs": {
"Manufacturer": "Texas Instruments",
"Package": "VQFN-48(7x7)",
"Category": "Clock/Timing",
"Pins": "49"
}
},
"variants": [],
"sections": [
"hero",
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"readme",
"breadcrumbs",
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],
"discovery_triggers": [
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],
"discovery_pitch": "LMX2820RTCR (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
"name": "Ray",
"email": "[email protected]"
},
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