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ADS7828

Public Made by Adom

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TI 12-bit, 8-channel, I2C SAR ADC, TSSOP-16. Internal 2.5 V reference, up to 50 kSPS. Datasheet-verified.

componentdata-converteradcsar-adc12-biti2ctssop-16texas-instruments
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Contents

README

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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 (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