Texas Instruments ADS7828EB/2K5G4

Overview

ADS7828EB/2K5G4 from Texas Instruments is a 12-bit, 8-channel SAR analog-to-digital converter with I²C interface, internal 2.5V reference, ±1 LSB integral linearity error, and 50kHz sampling rate in high-speed I²C mode. It operates from 2.7V to 5V and targets isolated voltage monitoring and battery-powered data acquisition systems.

For engineers reviewing the ADS7828EB/2K5G4 datasheet, ADS7828EB/2K5G4 pinout, ADS7828EB/2K5G4 application, or ADS7828EB/2K5G4 equivalent, key selection considerations include I²C timing compliance (up to 3.4MHz), TSSOP-16 package thermal performance, channel-to-channel isolation (120dB), and internal reference drift (15ppm/°C) in remote sensing environments.

Technical Context

The ADS7828EB/2K5G4 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, internally generated asynchronous clock, and configurable single-ended/differential input modes via command byte. Its I²C slave interface supports standard (100kHz), fast (400kHz), and high-speed (3.4MHz) modes with programmable hardware address (10010xx).

It features dual power-down control: PD1 toggles internal 2.5V reference (ON/OFF), PD0 controls ADC core (ON/OFF), enabling flexible quiescent current management - down to 400nA in full power-down. Channel selection (CH0–CH7) and COM terminal support multiplexed transducer interfacing with 25pF input capacitance and ±1µA leakage.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package with 0.65mm pitch, 5mm × 4.4mm footprint, and exposed pad for thermal dissipation (θ_JA = 240°C/W). RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit I²C ADC applications.

Compared with ADS7828EB/2K5G4, ADS7822U trades I²C flexibility for SPI determinism and lower software overhead, while MCP3221A0T-E/OT reduces footprint by 70% but increases BOM complexity and channel scalability limitations.

Availability

ADS7828EB/2K5G4 is available at Aetrix Electronics and suitable for voltage-supply monitoring, isolated data acquisition, and battery-operated systems requiring stable component supply across automotive, industrial, and medical device production cycles.

Supply support for ADS7828EB/2K5G4 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 signal chain solutions.

The ADS7828EB/2K5G4 belongs to TI's precision SAR ADC product line, designed specifically for low-power, isolated, and space-constrained applications where I²C simplicity and internal reference integration reduce system-level design effort.

FAQ

What is the maximum I²C clock frequency supported by the ADS7828EB/2K5G4?

The ADS7828EB/2K5G4 supports I²C high-speed mode up to 3.4MHz with ≤100pF bus capacitance, enabling 50kHz sampling. At 400pF capacitance, the maximum clock drops to 1.7MHz. This timing is validated per I²C specification with t_LOW ≥160ns and t_HIGH ≥60ns in high-speed mode - critical for maintaining reliable communication in dense PCB layouts.

Does the ADS7828EB/2K5G4 require an external reference voltage?

No, the ADS7828EB/2K5G4 includes a factory-trimmed internal 2.5V reference with ±0.025V tolerance and 15ppm/°C drift, eliminating the need for external reference components when operating from 2.7V–3.6V supplies. For 4.75V–5.25V operation, an external 5.0V reference may be used via REFIN/REFOUT to maximize dynamic range, but the internal reference remains functional and selectable.

How many analog input channels does the ADS7828EB/2K5G4 support, and what configurations are available?

The ADS7828EB/2K5G4 supports eight analog input channels (CH0–CH7) configurable as either eight single-ended inputs or four differential pairs using the command byte's SD bit and C2–C0 channel select bits. The COM pin serves as the common reference for differential measurements, and channel-to-channel isolation is specified at 120dB - essential for noise-immune multi-sensor systems.

What is the power consumption of the ADS7828EB/2K5G4 in different operating modes?

In high-speed I²C mode (3.4MHz) with internal reference enabled, the ADS7828EB/2K5G4 draws 1.3mA at +2.7V. In standard mode (100kHz), quiescent current drops to 60µA. Full power-down (SCL/SDA pulled HIGH) reduces current to 400nA. These values are measured per SBAS181C datasheet Table "POWER-SUPPLY REQUIREMENTS" and enable aggressive energy budgeting in battery-powered designs.

Can multiple ADS7828EB/2K5G4 devices share the same I²C bus?

Yes, up to four ADS7828EB/2K5G4 devices can coexist on one I²C bus using hardware address pins A0 and A1. The base address is 10010xx₂, where xx is set by A1/A0 logic levels at power-up. This allows independent addressing without software configuration - verified in TI's SBAS181C datasheet Section "ADS7828 HARDWARE ADDRESS" and Figure 2 timing diagrams.