ADS8508IBDWR

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

ADS8508IBDWR 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 3 for input range connections, with an absolute maximum 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 3 for input range connections, with an absolute maximum of ±25 V.
4	R3IN	input	Analog input; see Table 3 for input range connections, with an absolute maximum of ±25 V.
5	CAP	passive	Reference buffer capacitor; connect a 2.2-µF tantalum capacitor to ground.
6	REF	bidirectional	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.
7	AGND2	power_in	Analog ground; the voltage difference to DGND is limited to ±0.3 V.
8	SB/BTC	input	Selects the output data format: high for straight binary, low for binary 2's complement.
9	EXT/INT	input	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.
10	DGND	power_in	Digital ground; the voltage difference to AGND2 is limited to ±0.3 V.
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	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.
13	DATA	output	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.
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 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.
16	CS	input	Chip select, internally ORed with R/C.
17	BUSY	output	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.
18	PWRD	input	Power-down input; when high, conversions are inhibited and power consumption is significantly reduced, while previous results are kept in the output shift register.
19	VANA	power_in	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.
20	VDIG	power_in	Digital supply input, nominally +5 V, connected directly to pin 19; must be less than or equal to VANA.

Key specifications

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

CAD (KiCad official)

Symbol: ADS8508IBDWR
Footprint: Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm
3D model: SOIC-20-300mil (KiCad packages3D, STEP)
3D model files: ads8508ibdwr-etched.step / ads8508ibdwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ads8508ibdwr.step / ads8508ibdwr.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (31 pp, sha256 c85a8f3349deb778, retrieved 2026-10-11, 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

# ADS8508IBDWR

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

ADS8508IBDWR 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 3 for input range connections, with an absolute maximum 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 3 for input range connections, with an absolute maximum of ±25 V. |
| 4 | R3IN | input | Analog input; see Table 3 for input range connections, with an absolute maximum of ±25 V. |
| 5 | CAP | passive | Reference buffer capacitor; connect a 2.2-µF tantalum capacitor to ground. |
| 6 | REF | bidirectional | 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. |
| 7 | AGND2 | power_in | Analog ground; the voltage difference to DGND is limited to ±0.3 V. |
| 8 | SB/BTC | input | Selects the output data format: high for straight binary, low for binary 2's complement. |
| 9 | EXT/INT | input | 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. |
| 10 | DGND | power_in | Digital ground; the voltage difference to AGND2 is limited to ±0.3 V. |
| 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 | 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. |
| 13 | DATA | output | 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. |
| 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 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. |
| 16 | CS | input | Chip select, internally ORed with R/C. |
| 17 | BUSY | output | 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. |
| 18 | PWRD | input | Power-down input; when high, conversions are inhibited and power consumption is significantly reduced, while previous results are kept in the output shift register. |
| 19 | VANA | power_in | 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. |
| 20 | VDIG | power_in | Digital supply input, nominally +5 V, connected directly to pin 19; must be less than or equal to VANA. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `ADS8508IBDWR`
- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`
- 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
- 3D model files: `ads8508ibdwr-etched.step` / `ads8508ibdwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ads8508ibdwr.step` / `ads8508ibdwr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/ads8508) (31 pp, sha256 `c85a8f3349deb778`, retrieved 2026-10-11, 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](docs/ads8508ibdwr-datasheet.pdf)