# DDC112U

**Texas Instruments** · Analog To Digital Converters (ADC) · SOIC-28-300mil

DDC112U from Texas Instruments, in a SOIC-28-300mil. 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 | IN1 | input | Input 1: analog input for Integrators 1A and 1B, integrator selection controlled by CONV input. |
| 2 | AGND | power_in | Analog Ground |
| 3 | CAP1B | passive | External Capacitor connection for Integrator 1B |
| 4 | CAP1B | passive | External Capacitor connection for Integrator 1B |
| 5 | CAP1A | passive | External Capacitor connection for Integrator 1A |
| 6 | CAP1A | passive | External Capacitor connection for Integrator 1A |
| 7 | AVDD | power_in | Analog Supply, +5V Nominal |
| 8 | TEST | input | Test Control Input; when HIGH, test charge is applied to A or B integrators on next CONV transition. |
| 9 | CONV | input | Controls which integrator side connects to input; CONV HIGH enables side A integration, CONV LOW enables side B integration; must be synchronized with CLK. |
| 10 | CLK | input | System Clock Input, 10MHz Nominal |
| 11 | DCLK | input | Serial Data Clock Input that operates the serial I/O shift register. |
| 12 | DXMIT | input | Serial Data Transmit Enable Input; when LOW, enables the internal serial shift register. |
| 13 | DIN | input | Serial Digital Input used to cascade multiple DDC112 units. |
| 14 | DVDD | power_in | Digital Supply, +5V Nominal |
| 15 | DGND | power_in | Digital Ground |
| 16 | DOUT | tri_state | Serial Data Output with high-impedance state when DXMIT is HIGH. |
| 17 | DVALID | output | Data Valid Output; LOW value indicates valid data is available in serial I/O register. |
| 18 | RANGE0 | input | Range Control Input 0 (least significant bit) for full-scale range selection. |
| 19 | RANGE1 | input | Range Control Input 1 for full-scale range selection. |
| 20 | RANGE2 | input | Range Control Input 2 (most significant bit) for full-scale range selection. |
| 21 | AGND | power_in | Analog Ground |
| 22 | VREF | power_in | External Reference Input, +4.096V Nominal; used for integrator reset and ΔΣ converter measurement. |
| 23 | CAP2A | passive | External Capacitor connection for Integrator 2A |
| 24 | CAP2A | passive | External Capacitor connection for Integrator 2A |
| 25 | CAP2B | passive | External Capacitor connection for Integrator 2B |
| 26 | CAP2B | passive | External Capacitor connection for Integrator 2B |
| 27 | AGND | power_in | Analog Ground |
| 28 | IN2 | input | Input 2: analog input for Integrators 2A and 2B, integrator selection controlled by CONV input. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-28-300mil |
| Category | Data Acquisition |
| Pins | 28 |

## CAD (KiCad official)

- Symbol: `DDC112U`
- Footprint: `Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm`
- 3D model: SOIC-28-300mil (KiCad packages3D, STEP)
- 3D model files: `ddc112u-etched.step` / `ddc112u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ddc112u.step` / `ddc112u.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/ddc112) (37 pp, sha256 `563a1029aa722041`, retrieved 2026-10-06, 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/ddc112u-datasheet.pdf)