# ADS8321EB

**Texas Instruments** · Analog To Digital Converters (ADCs) · VSSOP-8

ADS8321EB from Texas Instruments, in a VSSOP-8. 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 | VREF | power_in | Reference input that sets the analog input range; the external reference can be any voltage from 500mV to VCC/2, and the external reference absolute maximum is +5.5V. |
| 2 | +In | input | Non-inverting analog input; it should remain within GND - 300mV to VCC + 300mV, outside which the converter's linearity may not meet specifications. |
| 3 | -In | input | Inverting analog input; it should remain within GND - 300mV to 4V, outside which the converter's linearity may not meet specifications. |
| 4 | GND | power_in | Ground pin, which should be placed on a clean ground point and kept away from microcontroller, microprocessor, or DSP ground connections. |
| 5 | CS/SHDN | input | Chip select when LOW; shutdown mode when HIGH, and a new conversion starts only when CS has been taken HIGH and returned LOW. |
| 6 | DOUT | output | Serial data output of 16 bits, valid on the falling edge of DCLOCK; the second DCLOCK pulse after the falling edge of CS enables the output, and after one null bit the data is valid for the next 16 edges. |
| 7 | DCLOCK | input | Data clock that synchronizes the serial data transfer and determines the conversion speed. |
| 8 | +VCC | power_in | Power supply input; specified performance is 4.75V to 5.25V, the VCC range is 2.7V to 5.25V, and the absolute maximum is +6V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8 |
| Category | Data Converters |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| No Missing Codes |  | 15 |  |  | Bits |  | 3 |
| Integral Linearity Error |  | -0.012 | 0.006 | 0.012 | % of FSR |  | 3 |
| Offset Error |  | -1 | 0.2 | 1 | mV |  | 3 |
| Offset Temperature Drift |  | -1 | 1 | 1 | µV/°C |  | 3 |
| Gain Error, Positive |  | -0.024 |  | 0.024 | % |  | 3 |
| Gain Error, Negative |  | -0.024 |  | 0.024 | % |  | 3 |
| Gain Temperature Drift |  | -0.3 |  | 0.3 | ppm/°C |  | 3 |
| Absolute Input Range (+In) |  | -0.1 |  |  | V |  | 3 |
| Absolute Input Range (-In) |  | -0.1 |  | 4 | V |  | 3 |
| Common-Mode Rejection Ratio |  | 80 |  |  | dB |  | 3 |
| Power Supply Rejection Ratio |  |  |  | 3 | LSB | +4.7V < VCC < 5.25V | 3 |
| Clock Frequency Range |  | 0.024 |  | 2.9 | MHz |  | 3 |
| Input High Voltage | VIH | 3 |  |  | V | IIH = +5µA | 3 |
| Input Low Voltage | VIL | -0.3 |  | 0.8 | V | IIL = +5µA | 3 |
| Output High Voltage | VOH | 4 |  |  | V | IOH = -250µA | 3 |
| Output Low Voltage | VOL |  |  | 0.4 | V | IOL = 250µA | 3 |
| VCC Specified Performance |  | 4.75 |  | 5.25 | V |  | 3 |
| VCC Range |  | 2.7 |  | 5.25 | V |  | 3 |
| Quiescent Current |  |  | 1100 | 1700 | µA |  | 3 |
| Power Dissipation |  |  | 5.5 | 8.5 | mW |  | 3 |
| Power Down Supply Current |  |  | 0.3 | 3 | µA | CS = VCC | 3 |
| Specified Performance (temperature range) |  | -40 |  | 85 | °C |  | 3 |
| Reference Input Voltage Range |  | 0.5 |  |  | V |  | 3 |
| Reference Current Drain |  |  | 40 | 80 | µA |  | 3 |
| Reference Current Drain (power down) |  |  | 0.1 | 3 | µA | CS = VCC | 3 |
| Leakage Current |  |  |  | 1 | nA |  | 3 |
| Analog Input Sample Time | tSMPL | 4.5 |  | 5 | Clk Cycles |  | 9 |
| CS Falling to DCLOCK Rising | tSUCS | 20 |  |  | ns |  | 9 |
| DCLOCK Falling to DOUT Not Valid (hold) | thDO | 5 |  | 15 | ns |  | 9 |
| DCLOCK Falling to Next DOUT Valid | tdDO | 30 |  | 50 | ns |  | 9 |
| CS Rising to DOUT Tri-State | tdis | 70 |  | 100 | ns |  | 9 |
| DCLOCK Falling to DOUT Enabled | ten | 20 |  | 50 | ns |  | 9 |
| DOUT Fall Time | tf | 5 |  | 25 | ns |  | 9 |
| DOUT Rise Time | tr | 7 |  | 25 | ns |  | 9 |
| VCC Supply Voltage (absolute maximum) | VCC |  |  | 6 | V |  | 2 |
| Analog Input (absolute maximum) |  | -0.3 |  |  | V |  | 2 |
| Logic Input (absolute maximum) |  | -0.3 |  | 6 | V |  | 2 |
| Case Temperature (absolute maximum) |  |  |  | 100 | °C |  | 2 |
| Junction Temperature (absolute maximum) |  |  |  | 150 | °C |  | 2 |
| Storage Temperature (absolute maximum) |  |  |  | 125 | °C |  | 2 |
| External Reference Voltage (absolute maximum) |  |  |  | 5.5 | V |  | 2 |

## CAD (KiCad official)

- Symbol: `ADS8321EB`
- Footprint: `Package_SO:VSSOP-8_3x3mm_P0.65mm`
- 3D model: VSSOP-8, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 1.1 mm tall, datasheet A, max). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions come from the datasheet drawing where it was read and are defaults otherwise (see provenance.model_3d_generated), not the manufacturer's CAD (STEP)
- 3D model files: `ads8321eb-2k5-etched.step` / `ads8321eb-2k5-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ads8321eb-2k5.step` / `ads8321eb-2k5.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/lit/ds/symlink/ads8321.pdf) (18 pp, sha256 `8172760a1091a893`, retrieved 2026-11-11, tier: manufacturer)
- **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/ads8321eb-2k5-datasheet.pdf)