MCP3550

{
  "schema_version": 1,
  "type": "component",
  "slug": "mcp3550",
  "title": "MCP3550",
  "brief": "Microchip 22-bit low-power delta-sigma ADC, MSOP-8. SPI, single differential input, on-chip 50/60 Hz rejection. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "data-converter",
    "adc",
    "delta-sigma",
    "22-bit",
    "spi",
    "msop-8",
    "microchip"
  ],
  "component": {
    "mpn": "MCP3550",
    "manufacturer": "Microchip",
    "package": "MSOP-8",
    "pin_count": 8,
    "category": "Data Converter",
    "subcategory": "Delta-sigma ADC",
    "datasheet": "https://ww1.microchip.com/downloads/en/DeviceDoc/20001950F.pdf",
    "parts": {
      "symbol": "mcp3550.kicad_sym",
      "footprint": "mcp3550.kicad_mod",
      "model_3d": "mcp3550-etched.glb",
      "model_3d_plain": "mcp3550.glb",
      "model_3d_step": "mcp3550-etched.step",
      "model_3d_step_plain": "mcp3550.step",
      "lbr": "mcp3550.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "VREF",
        "type": "input",
        "description": "Reference voltage analog input. Accepts a single-ended reference from 0.1 V to VDD; sets the full-scale conversion range (2*VREF differential). Lower VREF reduces INL error (which scales with VREF^2) but does not significantly reduce output noise."
      },
      {
        "number": "2",
        "name": "VIN+",
        "type": "input",
        "description": "Non-inverting analog input of the differential ADC. Together with VIN-, forms the fully differential measurement input; ensured accuracy from -VREF to +VREF with about 12% overrange available at room temperature."
      },
      {
        "number": "3",
        "name": "VIN-",
        "type": "input",
        "description": "Inverting analog input of the differential ADC. Absolute voltage on VIN+/VIN- must remain within VSS-0.3 V to VDD+0.3 V; exceeding this range activates ESD diode leakage and degrades performance."
      },
      {
        "number": "4",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground return for both analog and digital circuitry. Should be tied to the analog ground plane of the PCB when one is available."
      },
      {
        "number": "5",
        "name": "SCK",
        "type": "input",
        "description": "Serial clock digital input. Synchronizes data shifted out on SDO on the falling edge; input is latched on the rising edge. Supports SPI modes 0,0 and 1,1 up to 5 MHz; may idle high or low while CS is high. VIH = 0.7*VDD, VIL = 0.4 V."
      },
      {
        "number": "6",
        "name": "SDO/RDY",
        "type": "output",
        "description": "Serial data output / ready flag. Goes active-low when a conversion completes to signal ready; subsequent SCK falling edges then shift out a 24-bit word (2 overflow bits + 22 data bits). Enters high-impedance when CS is high. VOH >= VDD-0.5 V, VOL <= 0.4 V at 1 mA."
      },
      {
        "number": "7",
        "name": "CS",
        "type": "input",
        "description": "Active-low chip select. Gates all SPI communication and controls internal conversions - a conversion begins on the falling edge of CS. Raising CS before conversion completes selects Single-Conversion mode; leaving CS low selects Continuous-Conversion mode and may be tied permanently low for 2-wire operation."
      },
      {
        "number": "8",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive supply, 2.7-5.5 V. Requires a 0.1 uF bypass capacitor. Typical IDD is 100-140 uA depending on part/VDD; sleep/shutdown current is ~1-10 uA."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://ww1.microchip.com/downloads/en/DeviceDoc/20001950F.pdf",
        "pages": 40,
        "sha256": "87917c931a7d2bf4",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "mcp3550.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.9,
          3,
          0.95
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "847c4c5023fe1603fbd36900a5dcc4bd3901ba473f71d42c9a469f0236eaadf3",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mcp3550-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.9,
          3,
          0.95
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "7d5918f4d0afa743d00516f4d022be119fbd9cc3ead30ed49c6a82c4e9c06dfd",
        "checked": "2026-10-26",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "22-bit delta-sigma ADC",
      "Channels": "1 differential",
      "Interface": "SPI",
      "Line rejection": "50 Hz or 60 Hz (part option)",
      "Supply current": "120 uA (typ)",
      "Reference": "External (VREF)",
      "Supply": "2.7-5.5 V",
      "Package": "MSOP-8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "mcp3550",
    "22-bit adc",
    "low power delta sigma adc",
    "precision adc spi"
  ],
  "discovery_pitch": "Microchip MCP3550 22-bit delta-sigma ADC (MSOP-8) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "mcp3550.kicad_sym",
    "mcp3550.kicad_mod",
    "mcp3550.glb",
    "mcp3550.step",
    "mcp3550.lbr",
    "docs/hero.png",
    "docs/mcp3550-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "mcp3550-etched.step"
  ],
  "variants": [
    {
      "mpn": "MCP3550-50E/MS (60 Hz reject, MSOP-8)",
      "kind": "packaging"
    },
    {
      "mpn": "MCP3550-60E/MS (50 Hz reject, MSOP-8)",
      "kind": "packaging"
    },
    {
      "mpn": "MCP3551E/MS (fast settle)",
      "kind": "unknown"
    }
  ]
}