Texas Instruments ADS7828E/2K5G4

Overview

ADS7828E/2K5G4 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-powered remote data acquisition systems.

For engineers reviewing the ADS7828E/2K5G4 datasheet, ADS7828E/2K5G4 pinout, ADS7828E/2K5G4 application, or ADS7828E/2K5G4 equivalent, key selection criteria include I²C bus timing compliance (up to 3.4 MHz), TSSOP-16 package thermal performance, channel-to-channel isolation (120 dB), and internal reference stability (15 ppm/°C) across –40°C to +85°C.

Technical Context

The ADS7828E/2K5G4 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, internally generated asynchronous clock, and automatic power-down between conversions. Its I²C slave interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes with programmable hardware address (10010xx).

It features dual analog input configurations-single-ended or differential-selected via command byte, with COM pin serving as common reference. The internal 2.5V reference can be disabled to accept external references from 0.05V to VDD, enabling full-scale input ranges matching supply voltage.

Key Specifications

Pinout & Package

TSSOP-16 package (PW designation), 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed pad optional for thermal enhancement. RoHS-compliant, moisture sensitivity level 2a.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7828E/2K5G4, ADS7822U offers higher speed but eliminates I²C compatibility and internal reference, while MCP3208-I/P provides identical resolution and channel count but mandates SPI and uses obsolete DIP packaging - making ADS7828E/2K5G4 the only production-ready, surface-mount, I²C-native option with integrated reference.

Availability

ADS7828E/2K5G4 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/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 ADS7828E/2K5G4 belongs to TI's precision SAR ADC product line, designed specifically for low-power, multi-channel sensing in space-constrained, isolated, or battery-powered applications where I²C simplicity and integrated reference reduce system complexity.

FAQ

What is the maximum I²C clock frequency supported by the ADS7828E/2K5G4?

The ADS7828E/2K5G4 supports I²C high-speed mode up to 3.4 MHz with ≤100 pF bus capacitance, delivering 50 kHz sampling throughput. At 400 pF bus load, maximum clock drops to 1.7 MHz. Standard (100 kHz) and fast (400 kHz) modes are also fully compliant per I²C specification. This scalability allows ADS7828E/2K5G4 to adapt to diverse system timing constraints without hardware changes.

Does the ADS7828E/2K5G4 require an external reference voltage?

No - the ADS7828E/2K5G4 includes a factory-trimmed internal 2.5V reference with ±0.025V tolerance and 15 ppm/°C drift, sufficient for most 12-bit applications. An external reference may be applied via REFIN/REFOUT only when extended range (e.g., 0–5V full-scale with 5V supply) or ultra-low drift (<5 ppm/°C) is required. Using the internal reference simplifies design and reduces component count for ADS7828E/2K5G4 deployments.

How many unique I²C addresses can be configured on the ADS7828E/2K5G4?

The ADS7828E/2K5G4 supports four unique I²C slave addresses via A0 and A1 pins, which set the two least-significant bits of the fixed 10010xx address prefix. Each pin can be tied to GND or VDD, yielding combinations 1001000, 1001001, 1001010, and 1001011. This allows up to four ADS7828E/2K5G4 devices on a single I²C bus without address collision - critical for multi-node sensor hubs.

What is the power consumption of the ADS7828E/2K5G4 in active and power-down modes?

In active conversion mode with I²C high-speed (3.4 MHz), ADS7828E/2K5G4 draws 225–320 µA at 2.7V (675–1000 µW). In full power-down (SCL/SDA pulled HIGH), it consumes only 400–3000 nA. Power-down modes with wrong-address detection draw 6–400 µA depending on I²C speed. These levels make ADS7828E/2K5G4 suitable for energy-harvesting and coin-cell applications where duty-cycled operation is essential.

Can the ADS7828E/2K5G4 perform differential measurements between arbitrary channel pairs?

Yes - the ADS7828E/2K5G4 supports true differential input configuration per channel via command byte control (SD=0). For example, CH0–CH1, CH2–CH3, CH4–CH5, and CH6–CH7 can be measured differentially with 120 dB channel-to-channel isolation. The COM pin serves as the common-mode reference, enabling rejection of shared noise sources without external op-amps - a key capability confirmed in ADS7828E/2K5G4's functional specification.