Texas Instruments ADS9224RIRHBT

Overview

ADS9224RIRHBT from Texas Instruments is a dual, simultaneous-sampling, 16-bit SAR ADC with 3 MSPS throughput and 333 ns latency, designed for high-precision, low-latency data acquisition in I/Q demodulation and optical encoder systems. It features integrated reference buffers, REFby2 common-mode generation, and supports unipolar fully differential inputs up to ±4.096 V.

For engineers reviewing the ADS9224RIRHBT datasheet, ADS9224RIRHBT pinout, ADS9224RIRHBT application, or ADS9224RIRHBT equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in SONAR and medical imaging, and confirmed alternative parts for design flexibility and supply continuity.

Technical Context

The ADS9224RIRHBT implements two independent 16-bit SAR cores with true simultaneous sampling, enabling precise phase-coherent capture of differential analog signals (e.g., sine/cosine encoder outputs or I/Q baseband channels). Its internal 2.5-V reference (±0.004 V tolerance) and REFby2 buffer (2.048 V ±5 mV) eliminate external reference components while supporting configurable common-mode biasing.

It supports three digital interface modes: enhanced-SPI (single/double data rate), parallel byte, and clock re-timer - the latter enabling deterministic timing with digital isolators. The device operates across –40°C to +125°C and draws 24.3–30.4 mA on AVDD at full speed, with aperture jitter of only 2 ps RMS.

Key Specifications

Pinout & Package

The ADS9224RIRHBT is housed in a 5.0 mm × 5.0 mm, 32-pin VQFN (RHB) package with exposed thermal pad, optimized for thermal dissipation in high-density DAQ PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel SAR ADC applications.

Compared with ADS9224RIRHBT, ADS9234RIRHBT trades 2-bit resolution for 0.5 MSPS speed and lower power, while AD7606C-16BSTZ offers broader input range and channel count at the cost of higher layout complexity and latency - making ADS9224RIRHBT optimal for compact, high-fidelity dual-channel systems.

Availability

ADS9224RIRHBT is available at Aetrix Electronics and suitable for optical encoders, SONAR receivers, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for ADS9224RIRHBT 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 over 50 years of innovation in precision data conversion and signal chain solutions.

The ADS92x4R product line was engineered for high-speed, simultaneous-sampling applications in demanding industrial, medical, and test equipment - emphasizing low latency, integrated references, and robust digital interfacing.

FAQ

What is the maximum analog input frequency supported by the ADS9224RIRHBT?

The ADS9224RIRHBT supports analog input frequencies up to 1.5 MHz while maintaining specified AC performance (e.g., 94 dB SNR at 1 MHz). Its –3-dB analog input bandwidth is 52 MHz, but usable dynamic performance is bounded by Nyquist at 1.5 MHz for 3 MSPS sampling. This makes ADS9224RIRHBT suitable for ultrasound, CT scanner front-ends, and high-bandwidth power-quality analyzers.

Does the ADS9224RIRHBT require external reference components?

No - the ADS9224RIRHBT integrates a precision 2.5-V reference (REFOUT), reference buffers (REFP_A/REFP_B), and a REFby2 common-mode generator. External decoupling capacitors (1 µF on REFOUT, 10 µF between REFP_x and REFM_x) are required per the datasheet, but no external reference ICs, resistors, or op-amps are needed, simplifying design and improving thermal stability.

How does the clock re-timer mode function in the ADS9224RIRHBT?

The ADS9224RIRHBT's clock re-timer mode uses the READY/STROBE output to synchronize data capture across digital isolators. When enabled, STROBE aligns with SDO-x data edges (±2.5 ns offset), eliminating timing uncertainty caused by isolator propagation delay. This allows deterministic, jitter-free transfers without requiring ultra-high-speed isolated SPI clocks - a key advantage in isolated motor control and medical safety-critical systems.

What is the purpose of the REFby2 pin on the ADS9224RIRHBT?

The REFby2 pin on the ADS9224RIRHBT outputs a buffered 2.048 V (or 2.148 V, selectable via register) voltage used to set the common-mode level of fully differential analog inputs. It eliminates the need for external resistive dividers or op-amp circuits, directly biasing AINP_A/AINM_A and AINP_B/AINM_B to VREFP_x/2 - critical for maximizing dynamic range in encoder and I/Q applications.

Can the ADS9224RIRHBT operate with a 3.3-V digital supply (DVDD)?

Yes - the ADS9224RIRHBT supports DVDD from 1.65 V to 5.5 V. At 3.3 V, it meets all timing specifications including 60 MHz SCLK for SPI single-data-rate mode and 45 MHz for parallel byte mode. Logic thresholds scale with DVDD (VIH = 0.7×DVDD), ensuring compatibility with standard 3.3-V FPGAs and MCUs without level translation.