ADS8508IBDWR

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  "type": "component",
  "slug": "ads8508ibdwr",
  "title": "ADS8508IBDWR",
  "brief": "Texas Instruments Analog To Digital Converters (ADCs), SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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  "component": {
    "mpn": "ADS8508IBDWR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-20-300mil",
    "pin_count": 20,
    "category": "ADC/DAC/Data Conversion",
    "subcategory": "Analog To Digital Converters (ADCs)",
    "datasheet": "https://www.ti.com/cn/lit/gpn/ads8508",
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    "distributor_links": {
      "lcsc": "C2670492",
      "digikey": "ADS8508IBDWR-ND",
      "mouser": "595-ADS8508IBDWR"
    },
    "distributor_check": {
      "checked_at": "2026-10-11T16:59:21Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ADS8508IBDWR-ND",
        "status": "found",
        "lifecycle": "Active"
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    },
    "pins": [
      {
        "number": "1",
        "name": "R1IN",
        "type": "input",
        "description": "Analog input; see Table 3 for input range connections, with an absolute maximum of ±25 V."
      },
      {
        "number": "2",
        "name": "AGND1",
        "type": "power_in",
        "description": "Analog ground used internally as the ground reference point, with minimal current flow."
      },
      {
        "number": "3",
        "name": "R2IN",
        "type": "input",
        "description": "Analog input; see Table 3 for input range connections, with an absolute maximum of ±25 V."
      },
      {
        "number": "4",
        "name": "R3IN",
        "type": "input",
        "description": "Analog input; see Table 3 for input range connections, with an absolute maximum of ±25 V."
      },
      {
        "number": "5",
        "name": "CAP",
        "type": "passive",
        "description": "Reference buffer capacitor; connect a 2.2-µF tantalum capacitor to ground."
      },
      {
        "number": "6",
        "name": "REF",
        "type": "bidirectional",
        "description": "Reference input/output that outputs the internal 2.5-V reference or can be driven by an external system reference, bypassed to ground with a 2.2-µF tantalum capacitor."
      },
      {
        "number": "7",
        "name": "AGND2",
        "type": "power_in",
        "description": "Analog ground; the voltage difference to DGND is limited to ±0.3 V."
      },
      {
        "number": "8",
        "name": "SB/BTC",
        "type": "input",
        "description": "Selects the output data format: high for straight binary, low for binary 2's complement."
      },
      {
        "number": "9",
        "name": "EXT/INT",
        "type": "input",
        "description": "Selects the data clock: high outputs data synchronized to the DATACLK input; low makes a convert command start transmission of the previous conversion's data with 16 clock pulses on DATACLK."
      },
      {
        "number": "10",
        "name": "DGND",
        "type": "power_in",
        "description": "Digital ground; the voltage difference to AGND2 is limited to ±0.3 V."
      },
      {
        "number": "11",
        "name": "SYNC",
        "type": "output",
        "description": "Sync output that supplies a data synchronization pulse when EXT is high and at least one external clock pulse has occurred while not in read mode."
      },
      {
        "number": "12",
        "name": "DATACLK",
        "type": "bidirectional",
        "description": "Data clock that is an input or output depending on the EXT/INT level; output data is synchronized to it, and when EXT/INT is low it transmits 16 pulses after each conversion."
      },
      {
        "number": "13",
        "name": "DATA",
        "type": "output",
        "description": "Serial data output synchronized to DATACLK, with format set by SB/BTC; in external clock mode, after 16 bits it outputs the TAG level while CS is low and R/C is high."
      },
      {
        "number": "14",
        "name": "TAG",
        "type": "input",
        "description": "Tag input for external clock mode; when EXT is high, digital data from TAG is output on DATA with a delay that depends on the clock mode."
      },
      {
        "number": "15",
        "name": "R/C",
        "type": "input",
        "description": "Read/convert input; with CS low, a falling edge puts the sample-and-hold into hold and starts a conversion."
      },
      {
        "number": "16",
        "name": "CS",
        "type": "input",
        "description": "Chip select, internally ORed with R/C."
      },
      {
        "number": "17",
        "name": "BUSY",
        "type": "output",
        "description": "Busy output that falls when a conversion starts and stays low until the conversion is complete and the data is latched into the output shift register."
      },
      {
        "number": "18",
        "name": "PWRD",
        "type": "input",
        "description": "Power-down input; when high, conversions are inhibited and power consumption is significantly reduced, while previous results are kept in the output shift register."
      },
      {
        "number": "19",
        "name": "VANA",
        "type": "power_in",
        "description": "Analog supply input, nominally +5 V, connected directly to pin 20 and decoupled with 0.1-µF ceramic and 10-µF tantalum capacitors; absolute maximum 6 V."
      },
      {
        "number": "20",
        "name": "VDIG",
        "type": "power_in",
        "description": "Digital supply input, nominally +5 V, connected directly to pin 19; must be less than or equal to VANA."
      }
    ],
    "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 package hint says SOIC-20-300mil, but the extracted text only gives the package as 'SO-20 DW' / ; The Terminal Functions table lists NC (no connect) with no pin number. All 20 numbered pins are assi; The pin table marks SB/BTC as 'O', but the description says it selects the output format, so it is a"
        ],
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        "cost_usd": 0.059,
        "at": "2026-10-11T16:59:03"
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      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/ads8508",
        "pages": 31,
        "sha256": "c85a8f3349deb778",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
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        "refuses_to_fabricate": true
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        "checked": "2026-10-11",
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  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-20-300mil",
      "Category": "ADC/DAC/Data Conversion",
      "Pins": "20"
    }
  },
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  "author": {
    "name": "Ray",
    "email": "[email protected]"
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