ADS7828

@@ -0,0 +1,60 @@+# ADS7828++**Texas Instruments** · SAR ADC · TSSOP-16++Digitizes eight analog inputs over I2C at 12-bit resolution. An internal multiplexer selects any of the eight single-ended channels (or four differential pairs), and a built-in 2.5 V reference means no external reference is needed for a full-scale span. Two address pins put up to four devices on one bus, and throughput reaches 50 kSPS. Runs from a single 2.7 to 5 V supply. A compact way to add many slow analog inputs to an I2C system.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | CH0 | input | Analog input channel 0. Selectable through the 8-channel multiplexer; input range 0 to VREF referenced to COM (or ground in single-ended mode). |+| 2 | CH1 | input | Analog input channel 1. Selectable through the 8-channel multiplexer; input range 0 to VREF. |+| 3 | CH2 | input | Analog input channel 2. Selectable through the 8-channel multiplexer; input range 0 to VREF. |+| 4 | CH3 | input | Analog input channel 3. Selectable through the 8-channel multiplexer; input range 0 to VREF. |+| 5 | CH4 | input | Analog input channel 4. Selectable through the 8-channel multiplexer; input range 0 to VREF. |+| 6 | CH5 | input | Analog input channel 5. Selectable through the 8-channel multiplexer; input range 0 to VREF. |+| 7 | CH6 | input | Analog input channel 6. Selectable through the 8-channel multiplexer; input range 0 to VREF. |+| 8 | CH7 | input | Analog input channel 7. Selectable through the 8-channel multiplexer; input range 0 to VREF. |+| 9 | GND | power_in | Analog ground reference for the device. Connect to the system analog ground plane. |+| 10 | REFIN/REFOUT | bidirectional | Internal +2.5V reference output / external reference input. Drives out the internal 2.5V reference when the internal reference is enabled; otherwise accepts an external reference between 0.05V and VDD. Bypass with a decoupling capacitor when using the internal reference. |+| 11 | COM | input | Common input to the analog multiplexer. Acts as the negative input for the ADC in single-ended mode (typically tied to GND) and as a shared reference for pseudo-differential channel pairs. |+| 12 | A0 | input | I2C slave address bit 0 (LSB). Combined with the fixed prefix 10010 and A1 to form the 7-bit device address. CMOS logic level, referenced to VDD. |+| 13 | A1 | input | I2C slave address bit 1. Combined with the fixed prefix 10010 and A0 to form the 7-bit device address, allowing up to four ADS7828 devices on a single I2C bus. |+| 14 | SCL | input | I2C serial clock input. Supports Standard (100kHz), Fast (400kHz), and High-Speed (3.4MHz) modes. Open-drain bus, requires an external pull-up resistor to VDD. |+| 15 | SDA | bidirectional | I2C serial data line. Open-drain, minimum 3mA sink capability; requires an external pull-up resistor to VDD. Carries command bytes and 12-bit conversion results. |+| 16 | VDD | power_in | Power supply input, 2.7V to 5.25V (3.3V nominal). Bypass with a ceramic decoupling capacitor to GND close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 12-bit SAR ADC |+| Channels | 8 single-ended / 4 differential |+| Interface | I2C (2 address pins) |+| Throughput | Up to 50 kSPS |+| Reference | Internal 2.5 V or external |+| Supply | 2.7-5 V |+| Package | TSSOP-16 |++## Ordering variants++- `ADS7828E (TSSOP-16, tube)`+- `ADS7828EB (TSSOP-16, better accuracy)`+- `ADS7828IPWR (TSSOP-16, tape & reel)`++## CAD (KiCad official)++- Symbol: `Analog_ADC:ADS7828 (KiCad official)`+- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`+- 3D model: TSSOP-16 (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/ads7828.pdf) (23 pp, sha256 `5d561f2383b6725b`, 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/ads7828-datasheet.pdf)

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