# ADS1243IPWR

**Texas Instruments** · Analog To Digital Converters (ADC) · TSSOP-20

ADS1243IPWR from Texas Instruments, in a TSSOP-20. 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 | VDD | power_in | Power Supply, 2.7V to 5.25V operating range |
| 2 | XIN | input | Clock Input, Master Clock Rate 1MHz to 5MHz |
| 3 | XOUT | output | Clock Output for external crystal or ceramic resonator connection |
| 4 | PDWN | input | Power Down Control, Active LOW, shuts down analog and digital circuits when LOW |
| 5 | VREF+ | power_in | Positive Differential Reference Input, reference voltage (VREF+ - VREF-) 0.1V to 5V |
| 6 | VREF- | power_in | Negative Differential Reference Input, reference voltage (VREF+ - VREF-) 0.1V to 5V |
| 7 | AIN0/D0 | bidirectional | Analog Input 0 or Digital I/O 0, input range GND+0.05V to VDD-1.5V with buffer ON |
| 8 | AIN1/D1 | bidirectional | Analog Input 1 or Digital I/O 1, input range GND+0.05V to VDD-1.5V with buffer ON |
| 9 | AIN4/D4 | bidirectional | Analog Input 4 or Digital I/O 4, input range GND+0.05V to VDD-1.5V with buffer ON |
| 10 | AIN5/D5 | bidirectional | Analog Input 5 or Digital I/O 5, input range GND+0.05V to VDD-1.5V with buffer ON |
| 11 | AIN6/D6 | bidirectional | Analog Input 6 or Digital I/O 6, input range GND+0.05V to VDD-1.5V with buffer ON |
| 12 | AIN7/D7 | bidirectional | Analog Input 7 or Digital I/O 7, input range GND+0.05V to VDD-1.5V with buffer ON |
| 13 | AIN2/D2 | bidirectional | Analog Input 2 or Digital I/O 2, input range GND+0.05V to VDD-1.5V with buffer ON |
| 14 | AIN3/D3 | bidirectional | Analog Input 3 or Digital I/O 3, input range GND+0.05V to VDD-1.5V with buffer ON |
| 15 | GND | power_in | Ground |
| 16 | CS | input | Chip Select, Active LOW, enables serial interface when LOW |
| 17 | DIN | input | Serial Data Input with Schmitt Trigger, SPI compatible |
| 18 | DOUT | tri_state | Serial Data Output, SPI compatible, tri-states when CS is HIGH |
| 19 | SCLK | input | Serial Clock with Schmitt Trigger, SPI compatible |
| 20 | DRDY | output | Data Ready Output, Active LOW, indicates new conversion data ready |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-20 |
| Category | Data Acquisition |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `ADS1243IPWR`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `ads1243ipwr-etched.step` / `ads1243ipwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ads1243ipwr.step` / `ads1243ipwr.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/ads1243) (34 pp, sha256 `0bf7c17072b2c943`, retrieved 2026-10-01, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/ads1243ipwr-datasheet.pdf)