# ADS1220IRVAT

**Texas Instruments** · Analog To Digital Converters (ADC) · VQFN-16-EP(3.6x3.6)

ADS1220IRVAT from Texas Instruments, in a VQFN-16-EP(3.6x3.6). 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 | CLK | input | External clock source pin; connect to DGND if not used. |
| 2 | DGND | power_in | Digital ground. |
| 3 | AVSS | power_in | Negative analog power supply. |
| 4 | AIN3/REFN1 | input | Analog input 3 and negative reference input 1; an internal low-side power switch is connected between this pin and AVSS. |
| 5 | AIN2 | input | Analog input 2; absolute voltage limits are AVSS - 0.3 V to AVDD + 0.3 V. |
| 6 | REFN0 | input | Negative reference input 0. |
| 7 | REFP0 | input | Positive reference input 0. |
| 8 | AIN1 | input | Analog input 1; absolute voltage limits are AVSS - 0.3 V to AVDD + 0.3 V. |
| 9 | AIN0/REFP1 | input | Analog input 0 and positive reference input 1; absolute voltage limits are AVSS - 0.3 V to AVDD + 0.3 V. |
| 10 | AVDD | power_in | Positive analog power supply; connect a 100 nF (or larger) capacitor to AVSS. |
| 11 | DVDD | power_in | Positive digital power supply; connect a 100 nF (or larger) capacitor to DGND. |
| 12 | DRDY | output | Data ready, active low; leave unconnected or tie to DVDD using a weak pull-up resistor if not used. |
| 13 | DOUT/DRDY | output | Serial data output combined with data ready; active low. |
| 14 | DIN | input | Serial data input. |
| 15 | SCLK | input | Serial clock input. |
| 16 | CS | input | Chip select, active low; connect to DGND if not used. |
| 17 | Thermal Pad | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-16-EP(3.6x3.6) |
| Category | Data Acquisition |
| Pins | 17 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Power-supply voltage AVDD to AVSS |  | -0.3 |  | 7 | V |  | 5 |
| Power-supply voltage DVDD to DGND |  | -0.3 |  | 7 | V |  | 5 |
| Power-supply voltage AVSS to DGND |  | -2.8 |  | 0.3 | V |  | 5 |
| Input current, continuous, any pin except power supply pins |  | -10 |  | 10 | mA | Continuous | 5 |
| Junction temperature | TJ | -40 |  | 150 | °C |  | 5 |
| Storage temperature | Tstg | -60 |  | 150 | °C |  | 5 |
| Unipolar analog power supply AVDD to AVSS |  | 2.3 |  | 5.5 | V |  | 6 |
| AVSS to DGND (unipolar analog supply) |  | -0.1 | 0 | 0.1 | V |  | 6 |
| Bipolar analog power supply AVDD to DGND |  | 2.3 | 2.5 | 2.75 | V |  | 6 |
| Bipolar analog power supply AVSS to DGND |  | -2.75 | -2.5 | -2.3 | V |  | 6 |
| Digital power supply DVDD to DGND |  | 2.3 |  | 5.5 | V |  | 6 |
| Differential reference input voltage | VREF | 0.75 | 2.5 |  | V | VREF = VREFPx, VREFNx | 6 |
| External clock frequency | fCLK | 0.5 | 4.096 | 4.5 | MHz |  | 6 |
| External clock duty cycle |  | 40 |  | 60 | % |  | 6 |
| Operating ambient temperature | TA | -40 |  | 125 | °C |  | 6 |
| Integral nonlinearity | INL | -15 | 6 | 15 | ppmFSR | Gain = 1 to 128, VCM = 0.5 AVDD, best fit | 7 |
| Input offset voltage | VIO | -4 |  | 4 | µV | PGA disabled, gain = 1 to 4, differential inputs | 7 |
| Input offset voltage | VIO | -30 | 4 | 30 | µV | Gain = 1, differential inputs, TA = 25°C | 7 |
| Offset drift |  |  | 0.08 | 0.3 | µV/°C | Gain = 1 to 128, TA = -40°C to +85°C | 7 |
| Offset match between any two inputs |  | -20 |  | 20 | µV | Match between any two inputs | 7 |
| Gain error |  | -0.1 | 0.015 | 0.1 | % | Gain = 1 to 128, TA = 25°C | 7 |
| Gain error |  | -0.015 |  | 0.015 | % | PGA disabled, gain = 1 to 4 | 7 |
| Gain drift |  |  | 1 | 4 | ppm/°C | Gain = 1 to 128 | 7 |
| Common-mode rejection ratio | CMRR | 90 | 105 |  | dB | At dc, gain = 1 | 7 |
| Common-mode rejection ratio | CMRR | 95 | 115 |  | dB | fCM = 50Hz, DR = 2000SPS | 7 |
| Power-supply rejection ratio | PSRR | 80 | 105 |  | dB | AVDD at dc, VCM = 0.5 AVDD, gain = 1 | 7 |
| Power-supply rejection ratio | PSRR | 100 | 115 |  | dB | DVDD at dc, VCM = 0.5 AVDD, gain = 1 | 7 |
| Internal voltage reference initial accuracy |  | 2.045 | 2.048 | 2.051 | V | TA = 25°C | 7 |
| Reference drift |  |  | 5 | 30 | ppm/°C |  | 7 |
| Reference input current |  | -10 |  | 10 | nA | REFP0 = VREF, REFN0 = AVSS | 7 |
| Internal oscillator accuracy |  | -2 | 1 | 2 | % | Normal mode | 7 |
| IDAC accuracy |  | -6 | 1 | 6 | % | All current settings, each IDAC | 7 |
| IDAC current match |  | -0.3 |  | 0.3 | % | Between IDACs (not valid for 10µA setting) | 7 |
| Temperature sensor accuracy |  | -0.5 | 0.25 | 0.5 | °C | TA = 0°C to +75°C | 8 |
| Temperature sensor accuracy |  | -1 | 0.5 | 1 | °C | TA = -40°C to +125°C | 8 |
| Temperature sensor accuracy vs analog supply voltage |  |  | 0.0625 | 0.25 | °C/V |  | 8 |
| Low-side power switch on-resistance | RON |  | 3.5 | 5.5 | Ω |  | 8 |
| Input leakage, high | IH | -10 |  | 10 | µA | VIH = 5.5V | 8 |
| Input leakage, low | IL | -10 |  | 10 | µA | VIL = DGND | 8 |
| Analog supply current, power-down mode | IAVDD |  | 0.1 | 3 | µA | Power-down mode | 8 |
| Analog supply current, normal mode, gain = 1 to 16 | IAVDD |  | 340 | 490 | µA | Normal mode, gain = 1 to 16 | 8 |
| Digital supply current, power-down mode | IDVDD |  | 0.3 | 5 | µA | Power-down mode | 8 |
| Digital supply current, normal mode | IDVDD |  | 75 | 110 | µA | Normal mode | 8 |
| Power dissipation, normal mode, gain = 1 to 16 | PD |  | 1.4 |  | mW | Normal mode, gain = 1 to 16 | 8 |
| Analog supply current, duty-cycle mode, PGA disabled | IAVDD |  | 65 |  | µA | Duty-cycle mode, PGA disabled | 8 |
| Analog supply current, normal mode, PGA disabled | IAVDD |  | 240 |  | µA | Normal mode, PGA disabled | 8 |
| Analog supply current, turbo mode, gain = 1 to 16 | IAVDD |  | 540 |  | µA | Turbo mode, gain = 1 to 16 | 8 |
| Digital supply current, duty-cycle mode | IDVDD |  | 55 |  | µA | Duty-cycle mode | 8 |
| Normal-mode rejection ratio, 50Hz | NMRR |  | 105 |  | dB | 50Hz ±3%, DR = 20SPS, external CLK, 50/60 bit = 10b | 7 |
| Normal-mode rejection ratio, 60Hz | NMRR |  | 105 |  | dB | 60Hz ±3%, DR = 20SPS, external CLK, 50/60 bit = 11b | 7 |
| IDAC temperature drift |  |  | 50 |  | ppm/°C | Each IDAC (not valid for 10µA setting) | 7 |
| Current through low-side switch |  |  | 30 |  | mA |  | 8 |
| Thermal resistance, junction-to-ambient | RθJA |  | 43.4 |  | °C/W | VQFN (RVA), 16 pins | 6 |
| Thermal resistance, junction-to-case (top) | RθJC(top) |  | 47.3 |  | °C/W | VQFN (RVA), 16 pins | 6 |
| Thermal resistance, junction-to-board | RθJB |  | 18.4 |  | °C/W | VQFN (RVA), 16 pins | 6 |
| Junction-to-top characterization parameter | ψJT |  | 0.6 |  | °C/W | VQFN (RVA), 16 pins | 6 |
| Junction-to-board characterization parameter | ψJB |  | 18.4 |  | °C/W | VQFN (RVA), 16 pins | 6 |
| Thermal resistance, junction-to-case (bottom) | RθJC(bot) |  | 2 |  | °C/W | VQFN (RVA), 16 pins | 6 |

## CAD (KiCad official)

- Symbol: `ADS1220IRVAT`
- Footprint: `Package_DFN_QFN:Texas_RVA_VQFN-16-1EP_3.5x3.5mm_P0.5mm_EP2.14x2.14mm`
- 3D model: VQFN-16-EP(3.6x3.6), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.9 mm nominal VQFN height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `ads1220irvat-etched.step` / `ads1220irvat-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ads1220irvat.step` / `ads1220irvat.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/ads1220.pdf) (78 pp, sha256 `218e25810febc1d7`, retrieved 2026-11-07, 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/ads1220irvat-datasheet.pdf)