component
ADS1254E
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Texas Instruments Analog To Digital Converters (ADC), QSOP-20-150mil. 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
markdownADS1254E
Texas Instruments · Analog To Digital Converters (ADC) · QSOP-20-150mil
ADS1254E from Texas Instruments, in a QSOP-20-150mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CH1+ | input | Positive input of first differential analog channel; accepts ±VREF from AGND to AVDD with ±10mA continuous or ±100mA momentary input current limit |
| 2 | CH1- | input | Negative input of first differential analog channel; accepts ±VREF from AGND to AVDD with ±10mA continuous or ±100mA momentary input current limit |
| 3 | CH2+ | input | Positive input of second differential analog channel; accepts ±VREF from AGND to AVDD with ±10mA continuous or ±100mA momentary input current limit |
| 4 | CH2- | input | Negative input of second differential analog channel; accepts ±VREF from AGND to AVDD with ±10mA continuous or ±100mA momentary input current limit |
| 5 | CH3+ | input | Positive input of third differential analog channel; accepts ±VREF from AGND to AVDD with ±10mA continuous or ±100mA momentary input current limit |
| 6 | CH3- | input | Negative input of third differential analog channel; accepts ±VREF from AGND to AVDD with ±10mA continuous or ±100mA momentary input current limit |
| 7 | AVDD | power_in | Analog power supply voltage input; requires 4.75V to 5.25V regulated DC supply with 0.8 to 1.15mA quiescent current draw at +5V |
| 8 | CLK | input | System clock input; CMOS-compatible Schmitt-Trigger clock operating from DC to 8MHz controlling modulator frequency and data output rate |
| 9 | DVDD | power_in | Digital power supply voltage input; requires 1.8V to 3.6V regulated DC supply with 0.2 to 0.4mA quiescent current draw at 1.8V |
| 10 | NC | unconnected | No connection; leave floating |
| 11 | NC | unconnected | No connection; leave floating |
| 12 | DGND | power_in | Digital ground reference; connect to digital ground plane as return path for digital power supply and signals |
| 13 | DOUT/DRDY | output | Serial data output and data-ready indicator; pulses LOW to indicate new 24-bit conversion result available, then shifts data MSB-first at SCLK falling edge up to 8MHz |
| 14 | SCLK | input | Serial clock input; CMOS-compatible Schmitt-Trigger clock operating to 8MHz with LOW normal state; holding HIGH for 4+ cycles synchronizes converters or 20+ cycles enters power-down mode |
| 15 | CHSEL1 | input | Channel select input bit 1 (MSB); Schmitt-Trigger digital input for selecting one of four analog input channels in combination with CHSEL0 |
| 16 | CHSEL0 | input | Channel select input bit 0 (LSB); Schmitt-Trigger digital input for selecting one of four analog input channels in combination with CHSEL1 |
| 17 | AGND | power_in | Analog ground reference; connect to analog ground plane separate from digital ground with single connection point between planes |
| 18 | VREF | power_in | Voltage reference input; accepts external reference from 0.5V to VDD with typical 4.096V setting ±4.096V full-scale range and drawing 32μA average current |
| 19 | CH4- | input | Negative input of fourth differential analog channel; accepts ±VREF from AGND to AVDD with ±10mA continuous or ±100mA momentary input current limit |
| 20 | CH4+ | input | Positive input of fourth differential analog channel; accepts ±VREF from AGND to AVDD with ±10mA continuous or ±100mA momentary input current limit |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | QSOP-20-150mil |
| Category | Data Acquisition |
| Pins | 20 |
CAD (KiCad official)
- Symbol:
ADS1254E - Footprint:
Package_SO:QSOP-20_3.9x8.7mm_P0.635mm - 3D model: QSOP-20-150mil (KiCad packages3D, STEP)
- 3D model files:
ads1254e-etched.step/ads1254e-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ads1254e.step/ads1254e.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (23 pp, sha256
33559a0608db9cd9, retrieved 2026-09-23, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).