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ADS8509IDWR

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Texas Instruments Analog To Digital Converters (ADCs), SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ADS8509IDWR

Texas Instruments · Analog To Digital Converters (ADCs) · SOIC-20-300mil

ADS8509IDWR from Texas Instruments, in a SOIC-20-300mil. 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 R1IN input Analog input; see Table 2 for input range connections, with an absolute maximum rating of ±25 V.
2 AGND1 power_in Analog ground used internally as the ground reference point, with minimal current flow.
3 R2IN input Analog input; see Table 2 for input range connections, with an absolute maximum rating of ±25 V.
4 R3IN input Analog input; see Table 2 for input range connections, with an absolute maximum rating of ±25 V.
5 CAP passive Reference buffer capacitor, specified as 2.2-µF tantalum to ground (printed as 2.2-mF in the source).
6 REF bidirectional Reference input/output that outputs the internal 2.5-V reference or accepts an external reference (2.3 V to 2.7 V for specified linearity), bypassed to ground with a 2.2-µF tantalum capacitor.
7 AGND2 power_in Analog ground.
8 SB/BTC input Selects the data output format: high gives straight binary and low gives binary 2's complement.
9 EXT/INT input Selects the external clock (high, data synchronized to DATACLK input) or internal clock (low, a convert command starts data transmission with 16 clock pulses on DATACLK) for transmitting data.
10 DGND power_in Digital ground.
11 SYNC output 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.
12 DATACLK bidirectional Input or output depending on the EXT/INT level; output data is synchronized to this clock, and when EXT/INT is low it transmits 16 pulses after each conversion and stays low between conversions.
13 DATA output Serial data output synchronized to DATACLK, with format set by SB/BTC; in external clock mode it outputs the TAG level after 16 bits while CS is low and R/C is high.
14 TAG input 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 external clock mode.
15 R/C input Read/convert input; with CS low, a falling edge puts the sample-and-hold into hold and starts a conversion, and it also starts data transmission when EXT/INT is low.
16 CS input Chip select, internally ORed with R/C.
17 BUSY output Busy output that falls when a conversion starts and remains low until the conversion is complete and the data is latched into the output shift register.
18 PWRD input Power-down input; when high, conversions are inhibited and power consumption is significantly reduced, with previous results held in the output shift register.
19 VANA power_in Analog supply input, nominally +5 V (absolute maximum 6 V); connect directly to pin 20 and decouple to ground with 0.1-µF ceramic and 10-µF tantalum capacitors.
20 VDIG power_in Digital supply input, nominally +5 V (absolute maximum 6 V); connect directly to pin 19 and keep at or below VANA.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-20-300mil
Category ADC/DAC/Data Conversion
Pins 20

CAD (KiCad official)

  • Symbol: ADS8509IDWR
  • Footprint: Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm
  • 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
  • 3D model files: ads8509idwr-etched.step / ads8509idwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ads8509idwr.step / ads8509idwr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (35 pp, sha256 5e8b3f4fd4d038f2, retrieved 2026-10-08, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (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