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HomeProductsIntegrated Circuits (ICs)Data Acquisition - Analog to Digital Converters (ADC)ADS124S08IRHBT
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ADS124S08IRHBT - Texas Instruments

Manufacturer Part Number
ADS124S08IRHBT
Manufacturer
Texas Instruments
Allelco Part Number
32D-ADS124S08IRHBT
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
4,919 pcs available, New & Original
Parts Description
IC ADC 24BIT SIGMA-DELTA 32VQFN
Package
32-VQFN (5x5)
Data sheet
ADS124S08IRHBT.pdf
RoHs Status
ROHS3 Compliant
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Specifications

ADS124S08IRHBT Tech Specifications
Texas Instruments - ADS124S08IRHBT technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - ADS124S08IRHBT

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Supply, Digital 2.7V ~ 3.6V
Voltage - Supply, Analog 2.7V ~ 5.25V
Supplier Device Package 32-VQFN (5x5)
Series -
Sampling Rate (Per Second) 4k
Reference Type External, Internal
Ratio - S/H:ADC 0:1
Package / Case 32-VFQFN Exposed Pad
Package Tape & Reel (TR)
Operating Temperature -55°C ~ 125°C
Product Attribute Attribute Value
Number of Inputs 12
Number of Bits 24
Number of A/D Converters 1
Mounting Type Surface Mount
Input Type Single Ended
Features PGA
Data Interface SPI
Configuration MUX-PGA-ADC
Base Product Number ADS124S08
Architecture Sigma-Delta

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

ADS124S08IRHBT Image
ADS124S08IRHBT (1)

Manufacturer Part Number

ADS124S08IRHBT

Manufacturer

Texas Instruments

Introduction

High-precision, low-power, 24-bit analog-to-digital converter (ADC) with integrated programmable gain amplifier (PGA) and multiplexer.

Product Features and Performance

24-bit resolution

Sigma-Delta architecture

Sampling rate up to 4 kSPS

12 single-ended inputs

Integrated PGA with programmable gain from 1 to 128

Integrated multiplexer

Low power consumption

Product Advantages

High precision and accuracy

Flexible input configuration

Efficient power management

Small package size

Key Technical Parameters

Supply voltage: 2.7V to 3.6V (digital), 2.7V to 5.25V (analog)

Operating temperature: -55°C to 125°C

Interface: SPI

Quality and Safety Features

RoHS3 compliant

Compact 32-VQFN (5x5) package

Compatibility

Compatible with a wide range of microcontrollers and digital signal processors that support SPI interface.

Application Areas

Industrial control and automation

Medical instrumentation

Test and measurement equipment

Portable and battery-powered devices

Product Lifecycle

The ADS124S08 is an active product and is not nearing discontinuation. Replacement or upgrade options are available from Texas Instruments.

Key Reasons to Choose This Product

High-precision 24-bit ADC performance

Low power consumption

Flexible input configuration with integrated PGA and multiplexer

Wide operating temperature range

Small and compact package size

Compatibility with a variety of microcontrollers and processors

Frequently Asked Questions(FAQ)

How does the ADS124S08IRHBT handle noise performance in high-resolution signal acquisition applications, and what design considerations are necessary to maintain effective resolution?
The ADS124S08IRHBT achieves 24-bit resolution through its sigma-delta architecture, which inherently provides high noise rejection, particularly for low-frequency signals such as those from strain gauges or temperature sensors. However, achieving full effective resolution depends on proper PCB layout, grounding techniques, and reference voltage stability. For example, a poorly designed analog front-end with excessive trace length or shared return paths can degrade the signal-to-noise ratio (SNR) by several dBs, effectively reducing usable bits. Engineers should implement star grounding, minimize loop areas, and use a stable external reference like the ADS131E08’s internal bandgap may suffice at lower speeds, but precision applications benefit from an external reference such as the REF5050. Additionally, oversampling and digital filtering within the device help improve resolution, but system-level noise must be controlled to realize the full 24-bit potential.
What are the key differences between using the internal versus external reference in the ADS124S08IRHBT, and how do these choices impact measurement accuracy and system complexity?
The ADS124S08IRHBT supports both internal and external references, offering flexibility depending on application requirements. The internal reference is convenient for prototyping and low-power systems but has typical initial accuracy of ±0.5% and drift over temperature that may limit long-term stability in precision applications. In contrast, an external precision reference such as the REF5025 (±0.05%, 2.5V) significantly improves absolute accuracy and reduces gain error across the input range. While using an external reference increases component count and board space, it enhances reliability in industrial environments where thermal gradients or aging could affect measurements. For battery-powered or compact designs, the internal reference may be acceptable if calibration is performed at known conditions. Ultimately, the choice affects both system cost and achievable measurement uncertainty.
Can the ADS124S08IRHBT operate reliably in harsh industrial environments, and what environmental constraints should engineers consider during system design?
Yes, the ADS124S08IRHBT is rated for operation from -55°C to 125°C, making it suitable for automotive and industrial applications. However, operating near the extremes requires careful attention to supply rail behavior, leakage currents, and reference stability. For instance, at elevated temperatures, input bias currents increase slightly, which can introduce offset errors if the source impedance is high. Additionally, the device’s PGA stages must not be overdriven by transient voltages exceeding VDD + 0.3V, which could lead to latch-up or degraded performance. Thermal cycling can also affect solder joints and PCB stress, so mechanical robustness should be evaluated. Proper decoupling, especially on both analog and digital supplies, is critical to prevent noise coupling during rapid temperature changes.
How does the ADS124S08IRHBT compare to other 24-bit ADCs in terms of power consumption and sampling rate, and when might one prefer this part over alternatives?
The ADS124S08IRHBT consumes approximately 1.8 mW at 4 kSPS with all channels enabled, which is moderate compared to ultra-low-power converters like the ADS1298 (used in bio-medical sensing), though the latter trades speed for power efficiency. In contrast, higher-speed 24-bit devices such as the ADS131M08 support up to 16 kSPS but draw more current. The ADS124S08 strikes a balance between resolution, channel count, and power, making it ideal for multi-sensor monitoring systems where data rates are modest but precision is paramount. When selecting between parts, engineers must evaluate the trade-off between sampling rate, channel multiplexing overhead, and digital interface overhead—SPI communication adds minimal latency but requires careful timing management in multi-device configurations.
What are the implications of the ADS124S08IRHBT’s single-ended input configuration when interfacing with differential sensors, and what mitigation strategies exist?
The ADS124S08IRHBT uses single-ended inputs via its internal multiplexer, which means each channel connects to a ground-referenced node. This limits its ability to reject common-mode noise when measuring small differential signals, especially if the sensor outputs are not referenced to the ADC’s ground plane. To mitigate this, designers often use instrumentation amplifiers (e.g., INA826) to convert differential sensor outputs into single-ended signals centered around mid-supply. Alternatively, dual-supply configurations or virtual ground techniques can be employed to shift the signal into the ADC’s input range while maintaining CMRR. It's essential to ensure that the total input range does not exceed the specified ±VREF limit, typically ±2.5V with a 5V reference, to avoid saturation and distortion.
How should the ADS124S08IRHBT be configured for optimal dynamic range when measuring slowly varying signals with high DC precision requirements?
For high DC precision, the ADS124S08IRHBT should be operated with a moderate data rate setting—such as 3.75 kSPS—and enabled digital filters like the sinc4 or sinc5 modes available via the register configuration. These filters provide excellent noise shaping and settling characteristics, improving resolution for static or quasi-static measurements. Additionally, enabling the built-in PGA with a gain setting appropriate to the expected signal amplitude maximizes the use of the ADC’s input range. For example, a 1 mVpp sensor signal benefits from a gain of 128, allowing full-scale utilization without clipping. Avoiding aggressive decimation ratios unless necessary preserves bandwidth while still meeting precision goals.
What SPI interface considerations are critical when integrating the ADS124S08IRHBT into a microcontroller-based system?
The ADS124S08IRHBT communicates via SPI with a maximum clock frequency of 5 MHz, requiring careful attention to signal integrity and timing margins. Long traces or multiple slaves can introduce skew, so level-shifting may be needed if interfacing with 5V logic. The CS# pin must remain asserted during command sequences to ensure correct frame alignment. Additionally, the DOUT/DOUTR pins require pull-up resistors if used in open-drain mode or when sharing the bus with other peripherals. Timing diagrams in the datasheet specify minimum setup and hold times relative to SCLK edges; violating these can result in corrupted data reads. Using DMA to transfer converted data minimizes CPU overhead and ensures consistent sampling intervals.
How does the ADS124S08IRHBT manage crosstalk between adjacent channels during multiplexed sampling, and what precautions reduce interference in dense layouts?
Crosstalk in the ADS124S08IRHBT arises primarily from capacitive coupling between input traces and shared internal routing paths during channel switching. At 4 kSPS per channel with 12 inputs, switching occurs every ~208 μs, which is slow enough to allow charge settling but fast enough to induce minor glitches. To minimize this, keep input traces short, separate analog and digital grounds at the ADC’s star point, and avoid routing high-speed digital lines near analog inputs. Using guard rings around sensitive traces and placing vias close to the VQFN pads improve return path continuity. Also, calibrating out offset variations through software averaging or calibration routines can compensate for residual coupling effects.
What role does the PGA play in the ADS124S08IRHBT, and how should gain selection impact system design decisions?
The programmable gain amplifier (PGA) in the ADS124S08IRHBT allows amplification of small input signals before digitization, increasing effective resolution for weak sources. Gains range from 1x to 128x in binary steps, enabling fine control over the input range. Selecting too low a gain wastes ADC bit resolution, while excessive gain risks saturating the ADC or amplifying noise. For instance, a 50 µVpp thermocouple output benefits from a 64x gain, yielding a 3.2 mVpp input span that matches well with the 24-bit ADC’s LSB size (~0.3 µV at 5V ref). Engineers should perform worst-case analysis of signal levels and noise floors to optimize gain, considering temperature drift and long-term stability of the amplifier stages.
How does the ADS124S08IRHBT compare to the ADS1248 in terms of channel count, architecture, and intended use cases?
The ADS124S08IRHBT differs from the ADS1248 primarily in sampling rate and packaging; the S08 variant targets lower-speed, high-resolution applications at 4 kSPS, whereas the standard ADS1248 operates up to 32 kSPS. Both share the same 24-bit sigma-delta core, 12-channel mux, and integrated PGA, but the S08 includes a more conservative design for reduced power and thermal stress. The ADS1248 may be preferable in systems requiring faster updates or higher throughput, while the S08 suits energy-constrained or thermally sensitive environments. Package options differ slightly—the IRHBT uses a 32-VQFN (5x5), compatible with automated assembly, whereas some variants use TSSOP. Selection depends on whether speed or efficiency drives the design.
What are the risks associated with exceeding the absolute maximum ratings of the ADS124S08IRHBT, and how can reliability be maintained under stress conditions?
Exceeding absolute maximum ratings—such as supply voltages beyond 5.25V analog or 3.6V digital—can cause irreversible damage due to ESD breakdown or gate oxide failure in CMOS structures. Even brief excursions above these limits risk latent defects that manifest later during field operation. To maintain reliability, always include clamping diodes or TVS devices at inputs if there’s risk of overvoltage. Power sequencing should follow recommended guidelines: analog supply before digital to prevent latch-up. Thermal derating is also advised near 125°C, where internal protection circuits activate but performance degrades. Adhering to MSL 3 handling procedures ensures moisture-induced popcorning doesn’t compromise solder joints under thermal cycling.
How should calibration be implemented when using the ADS124S08IRHBT in a production environment, and what factors influence calibration interval and accuracy?
Calibration of the ADS124S08IRHBT involves zero-offset and gain correction using internal registers accessible via SPI. Texas Instruments provides calibration routines in their evaluation software and recommends performing calibration at startup and after significant temperature changes. Due to the device’s low drift (<1 ppm/°C typical), annual recalibration may suffice in stable environments, but systems exposed to wide temperature swings benefit from periodic re-calibration. Factory calibration certificates are available for traceable accuracy, but end-users can implement two-point calibration using known zero and span inputs. Digital offset registers allow subtraction of residual offsets, while gain adjustment compensates for reference or PGA variations.
What are the advantages of using the ADS124S08IRHBT in battery-powered industrial monitoring systems, and how does it support low-power operation?
The ADS124S08IRHBT supports supply voltages down to 2.7V analog and 2.7V digital, making it compatible with single-cell lithium batteries or energy-harvesting systems. With typical active current of 0.9 mA at 4 kSPS and 5V supplies, it enables weeks of operation on small coin cells when combined with sleep modes between conversions. The device enters standby mode when idle, drawing microamps, and resumes quickly upon wake-up. Efficient SPI communication further reduces average power by minimizing active time. This makes it ideal for wireless sensor nodes or remote condition-monitoring devices where duty cycling and minimal quiescent current are critical design drivers.
How does the ADS124S08IRHBT support fault detection and diagnostic features, and what mechanisms help identify system anomalies?
The ADS124S08IRHBT includes several diagnostic capabilities, including overrange detection, IDAC current source monitoring, and self-test functions. The overrange flag asserts when any input exceeds the programmed range, aiding in fault isolation. An internal test source allows verification of ADC linearity and response without external stimulus. Engineers can also monitor reference voltage and supply rails through dedicated status registers. These features enhance system robustness in safety-critical applications like medical devices or process control, where undetected sensor failures could lead to erroneous readings. Combined with watchdog timers and redundant sampling, they form part of a comprehensive diagnostics strategy.
What packaging and mounting considerations are important when deploying the ADS124S08IRHBT in mass-produced consumer electronics?
The ADS124S08IRHBT comes in a 32-pin VQFN package (5x5 mm) with an exposed pad, requiring proper soldering and thermal management. During reflow, the exposed pad must make good contact with the PCB copper pour to ensure thermal conductivity and mechanical stability. Designers should apply solder paste adequately and verify voiding levels to avoid delamination. The Moisture Sensitivity Level 3 designation mandates storage below 60% RH and baking before assembly if humidity exceeds thresholds. Automated pick-and-place equipment handles the small footprint efficiently, but fiducial marks and sufficient keep-out zones around pads are essential for reliable placement. RoHS compliance simplifies global distribution without halogen restrictions.
How does the ADS124S08IRHBT integrate with Texas Instruments’ evaluation modules and development tools, and what resources aid rapid prototyping?
Texas Instruments offers the EVM-ADS124S08 evaluation module, which simplifies characterization and software development. The EVM connects directly to a PC via USB and interfaces with TI’s Precision Studio software for real-time plotting, configuration, and calibration. Developers can experiment with different gain settings, filter types, and data rates without modifying hardware. Additionally, reference designs in TIs literature (e.g., SLAA873) provide schematics showing optimal layout practices, including grounding, decoupling, and sensor interfacing. API libraries and code examples for popular MCUs streamline firmware integration, reducing time-to-market for new products leveraging the ADS124S08IRHBT.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments ADS124S08IRHBT

Product Attribute ADS124S08IRHBR ADS124S08IPBSR ADS124S08IPBS ADS124S08BIPBSR
Part Number ADS124S08IRHBR ADS124S08IPBSR ADS124S08IPBS ADS124S08BIPBSR
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Base Product Number - DAC34H84 MAX500 ADS62P42
Number of A/D Converters - - - 2
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Voltage - Supply, Digital - 1.14V ~ 1.26V 11.4V ~ 16.5V 1.65V ~ 3.6V
Configuration - - - S/H-ADC
Number of Inputs - - - 2
Sampling Rate (Per Second) - - - 65M
Data Interface - LVDS - Parallel I²C LVDS - Parallel, Parallel
Features - - - Simultaneous Sampling
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Series - - - -
Number of Bits - 16 8 14
Architecture - Current Source R-2R Pipelined
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage - Supply, Analog - 3.14V ~ 3.46V 11.4V ~ 16.5V 3V ~ 3.6V
Ratio - S/H:ADC - - - 1:1
Input Type - - - Differential
Reference Type - External, Internal External External, Internal

ADS124S08IRHBT Datasheet PDF

Download ADS124S08IRHBT pdf datasheets and Texas Instruments documentation for ADS124S08IRHBT - Texas Instruments.

HTML Datasheet
ADS124S06, ADS124S08 Datasheet.pdf
PCN Assembly/Origin
Mult Dev Assembly Mat Chg 26/Apr/2019.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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ADS124S08IRHBT Image

ADS124S08IRHBT

Texas Instruments
32D-ADS124S08IRHBT

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