Texas Instruments ADS9234RIRHBT

Overview

ADS9234RIRHBT from Texas Instruments is a dual, simultaneous-sampling, 14-bit SAR ADC with 3.5 MSPS throughput and 285 ns conversion latency. It features fully differential unipolar analog inputs, integrated reference and reference buffers (REFP_A/REFP_B, REFM_A/REFM_B), and supports enhanced-SPI and parallel byte interfaces. Designed for high-precision I/Q demodulation and optical encoder feedback loops in industrial motion control systems.

For engineers reviewing the ADS9234RIRHBT datasheet, ADS9234RIRHBT pinout, ADS9234RIRHBT application, or ADS9234RIRHBT equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in SONAR receivers and impedance analyzers, and two technically documented alternative parts - all extracted from TI's SBAS876C production datasheet (Rev. C, June 2019).

Technical Context

The ADS9234RIRHBT implements two independent SAR ADC cores with synchronized sampling triggered by a single CONVST signal, enabling true simultaneous capture of channel A (AINP_A/AINM_A) and channel B (AINP_B/AINM_B). Its internal 2.5-V reference (REFOUT) feeds dedicated reference buffers per channel, supporting precise common-mode setting via REFby2 (2.048 V or 2.148 V selectable).

It supports three digital interface modes: SPI-compatible (SDI/SDO-x/SCLK/CS), parallel byte (8-bit SDO-0–SDO-7), and clock re-timer (CRT) with READY/STROBE output for timing-critical FPGA or isolated MCU interfacing. Latency is fixed at 285 ns in zone 2 transfer mode, with acquisition time of 140 ns and aperture jitter of 2 ps.

Key Specifications

Pinout & Package

The ADS9234RIRHBT is housed in a 5.00 mm × 5.00 mm, 32-pin VQFN (RHB) package with exposed thermal pad connected to PCB ground. Pin numbering follows top-view orientation with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS9224RIRHBT and AD7606C-18BSTZ, the ADS9234RIRHBT uniquely balances 14-bit precision, 3.5 MSPS throughput, and 285 ns latency in a single-chip solution with integrated reference buffers - making it optimal for real-time I/Q, encoder, and SONAR signal chains where timing determinism and analog integration reduce system-level design risk.

Availability

ADS9234RIRHBT is available at Aetrix Electronics and suitable for optical encoders, SONAR receivers, and impedance analyzers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS9234RIRHBT 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 IC design.

The ADS92x4R product line was engineered for high-fidelity, low-latency simultaneous sampling in demanding real-time signal acquisition systems - including motion control, medical imaging, and test & measurement equipment.

FAQ

What is the maximum analog input frequency supported by the ADS9234RIRHBT?

The ADS9234RIRHBT supports analog input frequencies up to 1.5 MHz while maintaining specified AC performance (85.6-dB SNR, 84-dB SINAD). This bandwidth is defined by its –3-dB small-signal analog input bandwidth of 52 MHz and practical Nyquist-limited operation at 3.5 MSPS sampling rate. The device achieves 85 dB SNR at 1 MHz input, confirming usability in wideband I/Q demodulation and SONAR receiver front-ends.

Does the ADS9234RIRHBT require an external reference voltage?

No, the ADS9234RIRHBT does not require an external reference voltage. It integrates a precision 2.5-V internal reference (REFOUT, ±0.16% initial accuracy, 5.5 ppm/°C drift) and dual reference buffers (REFP_A/REFP_B) with dedicated negative reference outputs (REFM_A/REFM_B). External decoupling (10 µF per REFP_x–REFM_x pair) is required for specified performance, but no external reference IC is needed.

How does the ADS9234RIRHBT handle simultaneous sampling across both channels?

The ADS9234RIRHBT uses a single CONVST rising edge to trigger truly simultaneous sampling on both AINP_A/AINM_A and AINP_B/AINM_B inputs. Its matched analog front-end paths achieve <40 ps inter-channel aperture mismatch, ensuring phase coherence for vector-based measurements. This eliminates software or hardware skew correction in applications like I/Q demodulation and resolver-to-digital conversion.

What digital interface options does the ADS9234RIRHBT support?

The ADS9234RIRHBT supports three interface modes: SPI-compatible (with SDO-0–SDO-7 multiplexed across two 4-bit lanes), parallel byte (8-bit SDO-0–SDO-7 output), and clock re-timer (CRT) using READY/STROBE for isolated FPGA or MCU timing alignment. It operates with SCLK up to 60 MHz (SDR) or 22 MHz (DDR), and supports wide-read-cycle timing for compatibility with slower microcontrollers.

Is the ADS9234RIRHBT pin-compatible with other devices in the ADS92x4R family?

Yes, the ADS9234RIRHBT is pin-compatible with the ADS9224RIRHBT and other ADS92x4R variants in the same RHB (32-pin VQFN) package. All share identical pin configuration, power sequencing, and interface signaling - enabling drop-in replacement between 14-bit and 16-bit versions without PCB layout changes, provided system timing and SNR requirements align with the selected variant.