Texas Instruments ADS7828E/250G4

Overview

ADS7828E/250G4 from Texas Instruments is a 12-bit, 8-channel SAR analog-to-digital converter with I²C interface, internal 2.5V reference, ±2 LSB integral linearity error, and 50 kHz sampling rate in high-speed I²C mode. It operates from 2.7V to 5V and is used for precision voltage-supply monitoring in battery-operated and isolated data acquisition systems.

For engineers reviewing the ADS7828E/250G4 datasheet, ADS7828E/250G4 pinout, ADS7828E/250G4 application, or ADS7828E/250G4 equivalent, key selection factors include I²C bus timing compatibility (standard/fast/high-speed modes), TSSOP-16 package thermal performance, channel-to-channel isolation (120 dB), internal reference drift (15 ppm/°C), and power-down current (400 nA full shutdown).

Technical Context

The ADS7828E/250G4 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, asynchronous internal clocking, and automatic power-gating between conversions. Its I²C slave interface supports three speed grades-100 kHz standard, 400 kHz fast, and 3.4 MHz high-speed-with programmable hardware address (10010xx) enabling up to four devices on one bus.

It features dual analog input configurations (single-ended or differential per channel), configurable power-down states (reference ON/OFF, ADC ON/OFF), and a COM pin for common-mode reference selection. The internal 2.5V reference provides full-scale range for 2.7V–3.6V supplies; external reference support extends operation to 5V systems with 50 mV–5V reference inputs.

Key Specifications

Pinout & Package

TSSOP-16 (PW package code), 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed pad not electrically connected. RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.

Compared with ADS7828E/250G4, ADS7822U requires external reference and offers no I²C multi-drop capability, while MCP3208-I/P's fixed reference and DIP package limit suitability for compact, production-ready, multi-device I²C systems.

Availability

ADS7828E/250G4 is available at Aetrix Electronics and suitable for voltage-supply monitoring, isolated data acquisition, and battery-operated systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS7828E/250G4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade IC design.

The ADS7828E/250G4 belongs to TI's precision SAR ADC product line, engineered for low-power, multi-channel sensing in space-constrained, thermally sensitive, and electrically noisy environments such as power management units and isolated sensor nodes.

FAQ

What is the maximum I²C clock frequency supported by the ADS7828E/250G4?

The ADS7828E/250G4 supports I²C high-speed mode up to 3.4 MHz with ≤100 pF bus capacitance, enabling 50 kHz sampling. At 400 pF capacitance, maximum clock drops to 1.7 MHz. Standard (100 kHz) and fast (400 kHz) modes are also fully supported per I²C specification. This scalability allows ADS7828E/250G4 to operate across diverse microcontroller platforms without protocol translation.

Does the ADS7828E/250G4 require an external reference voltage?

No - the ADS7828E/250G4 integrates a factory-trimmed 2.5V reference with ±1% initial accuracy and 15 ppm/°C drift, sufficient for most 2.7–3.6V supply applications. An external reference is only required when operating from 4.75–5.25V supplies to maintain full 0–VDD input range; in that case, ADS7828E/250G4 accepts 50 mV–5V reference inputs on the REFIN/REFOUT pin.

How many ADS7828E/250G4 devices can share the same I²C bus?

Up to four ADS7828E/250G4 devices can coexist on one I²C bus using hardware address pins A0 and A1. The base address is fixed at 10010xx₂, where xx is set by A1/A0 logic levels at power-up. This enables scalable multi-node monitoring without address conflicts or software arbitration overhead - a key advantage of ADS7828E/250G4 in distributed sensor networks.

What is the power consumption of the ADS7828E/250G4 in active and shutdown modes?

In high-speed I²C mode (3.4 MHz), ADS7828E/250G4 draws 225–320 µA; in standard mode (100 kHz), it consumes just 60 µA. In full power-down (SCL/SDA pulled HIGH), supply current drops to 400–3000 nA. These figures - verified across –40°C to +85°C - make ADS7828E/250G4 ideal for energy-harvesting and battery-critical applications where duty cycling is essential.

Can the ADS7828E/250G4 perform differential measurements?

Yes - the ADS7828E/250G4 supports both single-ended and differential input modes per channel, selected via the SD bit in the command byte. Differential pairs (e.g., CH0+/CH1–) provide 120 dB channel-to-channel isolation and reject common-mode noise, making ADS7828E/250G4 suitable for precision transducer interfaces where EMI immunity is critical.