Texas Instruments ADS7823EB/2K5

Overview

ADS7823EB/2K5 from Texas Instruments is a 12-bit SAR analog-to-digital converter with I²C interface, designed for low-power remote sensing and isolated data acquisition. It delivers 50 kHz sampling rate at 3.4 MHz I²C high-speed mode, ±0.5 LSB integral linearity error, and operates from 2.7 V to 5 V supply. Its MSOP-8 package and four-word FILO buffer support battery-operated systems requiring minimal power and compact layout.

For engineers reviewing the ADS7823EB/2K5 datasheet, ADS7823EB/2K5 pinout, ADS7823EB/2K5 application, or ADS7823EB/2K5 equivalent, key selection considerations include I²C bus mode compatibility (Standard/Fast/High-Speed), external reference voltage range (0.05 V to VDD), A0/A1 address configuration, quiescent current scaling with clock rate (2–370 µA), and full powerdown current of ≤3 nA.

Technical Context

The ADS7823EB/2K5 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, internally generated asynchronous clock, and automatic power gating-core disabled between conversions. It supports three I²C modes via open-drain SDA/SCL, with hardware address 10010xx (A1/A0 configurable) and command byte format 000xxxxx.

Its 4-word FILO buffer enables burst reads in Standard/Fast modes, while High-Speed mode bypasses buffering and uses clock stretching for single-conversion readout. Reference input impedance is 1 GΩ, and analog input leakage is ±1 µA, enabling direct connection to high-impedance transducers without external buffering.

Key Specifications

Pinout & Package

ADS7823EB/2K5 is housed in an MSOP-8 (DGK) package - 3.0 mm × 3.0 mm, 0.65 mm pitch, thermally enhanced for low-power operation in space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP3221-E/P and ADS7822E/250, the ADS7823EB/2K5 uniquely combines user-configurable I²C addressing, ultra-low powerdown current (<3 nA), and guaranteed no-missing-codes performance in a space-saving MSOP-8 - making it optimal for multi-node, battery-sensitive, isolated sensing systems where bus efficiency and long-term reliability are critical.

Availability

ADS7823EB/2K5 is available at Aetrix Electronics and suitable for voltage supply monitoring, isolated data acquisition, transducer interface, and battery-operated systems requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for ADS7823EB/2K5 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 ADS7823EB/2K5 belongs to TI's precision SAR ADC product line, engineered specifically for low-power, I²C-connected sensing applications in harsh environments - emphasizing accuracy, robustness, and ease of integration in space- and energy-constrained designs.

FAQ

What is the maximum I²C clock frequency supported by the ADS7823EB/2K5?

The ADS7823EB/2K5 supports High-Speed I²C mode up to 3.4 MHz (with ≤100 pF bus capacitance) and 1.7 MHz (with ≤400 pF). At this rate, it achieves 50 kHz sampling and enables single-conversion readout with clock stretching. Standard (100 kHz) and Fast (400 kHz) modes are also fully supported for backward compatibility and lower EMI designs.

How does the ADS7823EB/2K5 handle multiple devices on the same I²C bus?

The ADS7823EB/2K5 uses hardware-configurable A0 and A1 pins to set bits 1 and 0 of its 7-bit I²C slave address (base 10010xx). This allows up to four ADS7823EB/2K5 units to coexist on one bus without address conflict. Each device must have unique A0/A1 combinations (e.g., 00, 01, 10, 11) established at power-up.

What is the significance of the "EB" suffix in ADS7823EB/2K5?

The "EB" denotes the enhanced performance grade of the ADS7823EB/2K5, featuring ±0.5 LSB integral linearity error (vs. ±1.0 LSB for ADS7823E) and tighter offset/gain error specifications. This grade is validated across –40°C to +85°C and is specified in the SBAS180B datasheet revision.

Can the ADS7823EB/2K5 operate with a 2.5 V reference while powered from a 3.3 V supply?

Yes - the ADS7823EB/2K5 accepts VREF from 0.05 V to VDD. With +VDD = 3.3 V and VREF = 2.5 V, full-scale input range is 0–2.5 V, yielding 610 µV per LSB. The 1 GΩ VREF input impedance prevents loading, and the device maintains ±0.5 LSB linearity and 33 µVrms noise under these conditions.

What happens if more than four conversions are read from the ADS7823EB/2K5 in Standard or Fast I²C mode?

In Standard or Fast mode, the ADS7823EB/2K5 stores results in a four-level FILO buffer. Reading beyond four words returns undefined (garbage) data because the buffer overflows and older conversions are overwritten. The datasheet explicitly limits reads to four words per transaction to ensure data integrity.