Texas Instruments ADS8324EB/250

Overview

ADS8324EB/250 from Texas Instruments is a 14-bit, 50kHz sampling SAR analog-to-digital converter optimized for ultra-low-power operation at 1.8V supply. It features differential bipolar input, SPI/SSI-compatible serial interface, and programmable reference range (500mV to VCC/2), enabling precision data acquisition in battery-powered remote sensors and isolated industrial monitoring systems.

For engineers reviewing the ADS8324EB/250 datasheet, ADS8324EB/250 pinout, ADS8324EB/250 application, or ADS8324EB/250 equivalent, key selection criteria include its 2.5mW power dissipation at 1.8V, ±2 LSB integral linearity error, MSOP-8 package compatibility with ADS7817, and differential input support for noise-immune signal conditioning in multi-channel DAQ.

Technical Context

The ADS8324EB/250 implements a capacitive redistribution SAR architecture fabricated in 0.6μm CMOS, integrating sample-and-hold functionality without external components. Its conversion cycle requires 16 clock cycles with 4.5-cycle acquisition time, synchronized via DCLOCK and initiated by CS/SHDN falling edge.

Digital output uses binary two's complement format, delivered MSB-first on DOUT after five DCLOCK edges, with two trailing zero bits. The device supports full power-down mode (≤3μA) when CS is high, and maintains >1GΩ input impedance during hold or shutdown states.

Key Specifications

Pinout & Package

ADS8324EB/250 is housed in an MSOP-8 (DGK) package, 3.0 mm × 3.0 mm × 1.0 mm body, with exposed pad for thermal enhancement and RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution, low-power SAR ADC applications.

Compared with ADS8324EB/250, ADS8325EB/250 offers higher resolution at increased power and cost, while ADS7817E/250 provides lower resolution with reduced power and cost-making ADS8324EB/250 the optimal balance for 14-bit, 50 kHz, ultra-low-power industrial DAQ.

Availability

ADS8324EB/250 is available at Aetrix Electronics and suitable for battery-operated remote sensors, isolated industrial data acquisition, and multi-channel simultaneous sampling requiring stable component supply and long-term lifecycle support.

Supply support for ADS8324EB/250 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 low-power design.

The ADS8324EB/250 belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power data acquisition in portable, isolated, and multi-channel industrial systems.

FAQ

What is the maximum sampling rate of the ADS8324EB/250 and under what conditions is it achieved?

The ADS8324EB/250 achieves a maximum sampling rate of 50 kHz when operated with a 1.2 MHz DCLOCK signal and VCC = 1.8 V. This rate is sustained across the full industrial temperature range (–40°C to +85°C) and requires the reference voltage to be set within 500 mV to VCC/2. At this rate, the device consumes 2.5 mW and maintains ±2 LSB integral linearity error. The ADS8324EB/250 must be configured with CS/SHDN asserted low for each conversion cycle to sustain full throughput.

How does the ADS8324EB/250 handle power-down mode, and what is the typical current draw?

The ADS8324EB/250 enters full power-down mode when the CS/SHDN pin is driven high, reducing supply current to ≤3 μA across –40°C to +85°C. In this state, both analog and digital sections are disabled, and DOUT enters high-impedance. The device remains in shutdown until CS/SHDN falls low again to initiate a new conversion. During active conversion, quiescent current is 1.7 mA at 1.8 V, dropping to 250 μA at 10 kHz sampling rate due to extended power-down intervals between conversions.

What is the input configuration supported by the ADS8324EB/250, and how does it affect signal range?

The ADS8324EB/250 supports fully differential bipolar input with independent +In and –In pins, enabling true differential measurement with common-mode rejection. The full-scale input span equals (+In – –In) and is set by VREF: ±VREF for differential mode, or 2·VREF peak-to-peak for single-ended mode (with –In held at fixed voltage). Input common-mode range is constrained to GND – 100 mV to VCC + 100 mV on +In and GND – 100 mV to 2 V on –In, ensuring linearity compliance across the specified operating range.

Can the ADS8324EB/250 interface directly with a 3.3V microcontroller SPI bus?

Yes, the ADS8324EB/250 can interface with a 3.3V microcontroller SPI bus, but only when VCC is supplied at 3.3V-not at its rated 1.8V. At VCC = 3.3V, DOUT swings from 0V to 3.3V, meeting standard 3.3V CMOS logic thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V). However, doing so forfeits the ultra-low-power advantage: power dissipation rises to 5.0 mW, and specifications such as INL (±3 LSB) and noise (60 μVrms) are guaranteed only at 1.8V. For 1.8V operation, level-shifting is required on DOUT and DCLOCK lines.

What packaging and ordering options are available for the ADS8324EB/250?

The ADS8324EB/250 is supplied in an MSOP-8 (DGK) package with RoHS-compliant lead finish and MSL Level-2-260°C-1 year rating. It is available exclusively in tape-and-reel format: ADS8324EB/250 contains 250 units per reel, while ADS8324EB/2K5 contains 2,500 units per reel. Both variants feature identical A24 part marking and operate across –40°C to +85°C. No tray or tube options exist for this grade; the "EB" suffix denotes enhanced performance (±2 LSB INL) versus the standard "E" grade (±3 LSB INL).