component
ADS1220IRVAR
Public Made by Adomby adom
Texas Instruments Analog To Digital Converters (ADC), VQFN-16-EP(3.5x3.5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownADS1220IRVAR
Texas Instruments · Analog To Digital Converters (ADC) · VQFN-16-EP(3.5x3.5)
ADS1220IRVAR from Texas Instruments, in a VQFN-16-EP(3.5x3.5). 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 input; tie to DGND when unused so the internal oscillator is active, and an external clock must be 0.5 MHz to 4.5 MHz with 40% to 60% duty cycle. |
| 2 | DGND | power_in | Digital ground; DVDD to DGND is rated -0.3 V to 7 V absolute maximum and AVSS to DGND must stay between -2.8 V and 0.3 V. |
| 3 | AVSS | power_in | Negative analog supply; it is 0 V (-0.1 V to 0.1 V) for unipolar operation or -2.75 V to -2.3 V for bipolar operation relative to DGND. |
| 4 | AIN3/REFN1 | input | Analog input 3 and negative reference input 1; it is also tied to AVSS through the internal low-side power switch, so leave it floating when unused. |
| 5 | AIN2 | input | Analog input 2; input voltage must stay between AVSS - 0.3 V and AVDD + 0.3 V to avoid forward-biasing the ESD diodes. |
| 6 | REFN0 | input | Negative reference input 0; it must stay between AVSS - 0.1 V and REFP0 - 0.75 V. |
| 7 | REFP0 | input | Positive reference input 0; it must stay between REFN0 + 0.75 V and AVDD + 0.1 V, with differential reference 0.75 V to AVDD - AVSS. |
| 8 | AIN1 | input | Analog input 1; input voltage must stay between AVSS - 0.3 V and AVDD + 0.3 V to avoid forward-biasing the ESD diodes. |
| 9 | AIN0/REFP1 | input | Analog input 0 and positive reference input 1; input voltage must stay between AVSS - 0.3 V and AVDD + 0.3 V. |
| 10 | AVDD | power_in | Positive analog supply; AVDD to AVSS is rated 7 V absolute maximum and recommended 2.3 V to 5.5 V, with a 100 nF (or larger) capacitor to AVSS. |
| 11 | DVDD | power_in | Positive digital supply; DVDD to DGND is recommended 2.3 V to 5.5 V, with a 100 nF (or larger) capacitor to DGND. |
| 12 | DRDY | output | Data-ready output, active low, indicating a new conversion result is available; if unused, leave it unconnected or pull it up to DVDD through a weak pull-up resistor. |
| 13 | DOUT/DRDY | output | Serial data output combined with data-ready signal, active low; it goes high impedance when CS is high and can be configured via DRDYM to indicate data ready. |
| 14 | DIN | input | Serial data input latched on the falling edge of SCLK for commands and register data; the device never drives this pin. |
| 15 | SCLK | input | Serial clock input with Schmitt-trigger; it must be kept low when the serial interface is idle and kept clean to avoid spurious data shifts. |
| 16 | CS | input | Chip select, active low; when CS is taken high the serial interface resets and DOUT/DRDY goes high impedance, and CS may be tied to DGND if the bus is not shared. |
| 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(3.5x3.5) |
| Category | Data Acquisition |
| Pins | 17 |
CAD (KiCad official)
- Symbol:
ADS1220IRVAR - Footprint:
Package_DFN_QFN:Texas_RVA_VQFN-16-1EP_3.5x3.5mm_P0.5mm_EP2.14x2.14mm - 3D model: VQFN-16-EP(3.5x3.5), 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)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (80 pp, sha256
b6715c9f35b93db7, retrieved 2026-10-08, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).