ADS8028IRTJR

{
  "slug": "ads8028irtjr",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Analog To Digital Converters (ADC), QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "data acquisition",
    "ads8028irtjr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ads8028irtjr.kicad_sym",
    "ads8028irtjr.kicad_mod",
    "ads8028irtjr.glb",
    "ads8028irtjr.step",
    "ads8028irtjr.lbr",
    "docs/hero.png",
    "docs/ads8028irtjr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ads8028irtjr-hero.glb",
    "ads8028irtjr-hero.overlay.json"
  ],
  "component": {
    "mpn": "ADS8028IRTJR",
    "manufacturer": "Texas Instruments",
    "package": "QFN-20-EP(4x4)",
    "pin_count": 21,
    "category": "Data Acquisition",
    "subcategory": "Analog To Digital Converters (ADC)",
    "datasheet": "https://www.ti.com/cn/lit/gpn/ads8028",
    "parts": {
      "symbol": "ads8028irtjr.kicad_sym",
      "footprint": "ads8028irtjr.kicad_mod",
      "model_3d": "ads8028irtjr-hero.glb",
      "model_3d_plain": "ads8028irtjr.glb",
      "model_3d_step": "ads8028irtjr-etched.step",
      "model_3d_step_plain": "ads8028irtjr.step",
      "lbr": "ads8028irtjr.lbr"
    },
    "distributor_links": {
      "lcsc": "C485976",
      "digikey": "296-ADS8028IRTJRTR-ND",
      "mouser": "595-ADS8028IRTJR"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T21:32:45Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-ADS8028IRTJRTR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-ADS8028IRTJR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "AIN3",
        "type": "input",
        "description": "Analog input channel 3, with an input range of 0 V to VREF."
      },
      {
        "number": "2",
        "name": "AIN4",
        "type": "input",
        "description": "Analog input channel 4, with an input range of 0 V to VREF."
      },
      {
        "number": "3",
        "name": "AIN5",
        "type": "input",
        "description": "Analog input channel 5, with an input range of 0 V to VREF."
      },
      {
        "number": "4",
        "name": "AIN6",
        "type": "input",
        "description": "Analog input channel 6, with an input range of 0 V to VREF."
      },
      {
        "number": "5",
        "name": "AIN7",
        "type": "input",
        "description": "Analog input channel 7, with an input range of 0 V to VREF."
      },
      {
        "number": "6",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground; DGND to AGND must remain within -0.3 V to +0.3 V."
      },
      {
        "number": "7",
        "name": "REF",
        "type": "bidirectional",
        "description": "ADC internal reference output or external reference input; REF to AGND is limited to AVDD + 0.3 V."
      },
      {
        "number": "8",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection; a passive component on this pin does not affect device functionality."
      },
      {
        "number": "9",
        "name": "DGND",
        "type": "power_in",
        "description": "Digital ground for the digital interface; DGND to AGND must remain within -0.3 V to +0.3 V."
      },
      {
        "number": "10",
        "name": "AVDD",
        "type": "power_in",
        "description": "ADC operation supply, 2.7 V to 5.25 V; DVDD must not exceed AVDD + 0.3 V."
      },
      {
        "number": "11",
        "name": "CS",
        "type": "input",
        "description": "Active-low chip select; the ADS8028 samples the analog input on the CS falling edge and digital inputs are limited to DVDD + 0.3 V."
      },
      {
        "number": "12",
        "name": "TM_BUSY",
        "type": "output",
        "description": "Busy output that stays high during conversion, including the up-to-100 µs temperature sensor conversion; digital outputs are limited to DVDD + 0.3 V."
      },
      {
        "number": "13",
        "name": "DIN",
        "type": "input",
        "description": "SPI data input, latched on the first 16 SCLK falling edges after CS falls; setup time 5 ns and hold time 4 ns."
      },
      {
        "number": "14",
        "name": "DOUT",
        "type": "output",
        "description": "SPI data output that leaves 3-state after CS falls and returns to 3-state on the 16th SCLK falling edge or CS rising edge."
      },
      {
        "number": "15",
        "name": "SCLK",
        "type": "input",
        "description": "SPI serial clock input, up to 20 MHz, used for both conversion and data transfer."
      },
      {
        "number": "16",
        "name": "DVDD",
        "type": "power_in",
        "description": "ADC interface supply, 1.65 V to 5.25 V; must satisfy DVDD ≤ AVDD + 0.3 V."
      },
      {
        "number": "17",
        "name": "PD/RST",
        "type": "input",
        "description": "Active-low dual-function pin: a low pulse under 60 ns resets the device, while a low pulse over 90 ns powers it down."
      },
      {
        "number": "18",
        "name": "AIN0",
        "type": "input",
        "description": "Analog input channel 0, with an input range of 0 V to VREF."
      },
      {
        "number": "19",
        "name": "AIN1",
        "type": "input",
        "description": "Analog input channel 1, with an input range of 0 V to VREF."
      },
      {
        "number": "20",
        "name": "AIN2",
        "type": "input",
        "description": "Analog input channel 2, with an input range of 0 V to VREF."
      },
      {
        "number": "21",
        "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-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The exposed thermal pad is listed in the pin assignment table as 'Thermal pad' with no printed pin n; Pin 12 TM_BUSY is listed as 'Digital input' in the pin assignment table, but its description says 'B; Pin 8 is printed as NC (no connection) and is typed unconnected.",
          "exposed pad 21 added from the footprint"
        ],
        "pages_sent": 17,
        "cost_usd": 0.0985,
        "at": "2026-10-08T21:32:02"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/ads8028",
        "pages": 36,
        "sha256": "2f47b48c9576bc45",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ads8028irtjr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.0,
          4.0,
          0.77
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "c9476a1612023de37f27b4972110ab6ac6dc0eaf5ac48957a2e1c497650082a5",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ads8028irtjr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          0.77
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "0857ac836d1b941b9967605ae7fab7c435aa66b7125f8b350a7492a7cedd5912",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}