ADS7042

@@ -0,0 +1,52 @@+# ADS7042++**Texas Instruments** · SAR ADC · VSSOP-8++Small 12-bit successive-approximation ADC that samples one single-ended input at up to 1 MSPS over SPI, drawing so little that its power scales almost to zero at low sample rates (about 1 uW at 1 kSPS). The reference is the analog supply, so a clean AVDD sets the full scale, and the tiny VSSOP-8 fits next to the signal it measures. Aimed at battery and energy-harvesting systems that sample slowly but need real resolution when they do.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | DVDD | power_in | Digital I/O supply voltage. Recommended range 1.65 V to 3.6 V (independent of AVDD); JESD8-7A compliant for a normal DVDD range of 1.65 V to 1.95 V. Bypass locally to GND. |+| 2 | SCLK | input | Serial clock input for the SPI-compatible interface. Used to clock out conversion data on SDO and to run the internal conversion; supports SCLK up to 16 MHz. |+| 3 | SDO | output | Serial data output. Shifts out the 12-bit conversion result MSB-first on SCLK edges while CS is asserted low. Referenced to DVDD. |+| 4 | CS | input | Active-low chip-select. The falling edge of CS samples the analog input, initiates conversion, and frames the SPI read of the conversion result. |+| 5 | AINM | input | Negative analog input of the single-ended SAR ADC. Tie to the analog ground reference; allowable range -0.3 V to +0.3 V relative to GND. |+| 6 | AINP | input | Positive analog input of the single-ended SAR ADC. Unipolar input range 0 V to AVDD; allowable range -0.3 V to AVDD+0.3 V. |+| 7 | AVDD | power_in | Analog power-supply input; also serves as the ADC reference voltage. Recommended range 1.65 V to 3.6 V. Requires a low-impedance bypass to GND for reference stability. |+| 8 | GND | power_in | Ground return for the analog and digital supplies. All analog and digital signals are referenced to this pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 12-bit SAR ADC |+| Throughput | 1 MSPS |+| Input | Single-ended (AINP/AINM) |+| Interface | SPI |+| Reference | AVDD (supply) |+| Power | ~1 uW at 1 kSPS |+| Supply | 1.65-3.6 V |+| Package | VSSOP-8 |++## Ordering variants++- `ADS7042IDCUR (VSSOP-8)`+- `ADS7042IRUGR (X2QFN-8)`++## CAD (KiCad official)++- Symbol: `Analog_ADC:ADS7042xDCU (KiCad official)`+- Footprint: `Package_SO:VSSOP-8_2.3x2mm_P0.5mm`+- 3D model: VSSOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/ads7042.pdf) (46 pp, sha256 `96d5f335d91126fd`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ads7042-datasheet.pdf)

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