Texas Instruments ADS9234RIRHBR

Overview

ADS9234RIRHBR 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 in SONAR receivers and optical encoders.

For engineers reviewing the ADS9234RIRHBR datasheet, ADS9234RIRHBR pinout, ADS9234RIRHBR application, or ADS9234RIRHBR equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in absolute encoder feedback loops and baseband signal acquisition, and two technically documented alternative parts for design flexibility.

Technical Context

The ADS9234RIRHBR implements two independent SAR ADC cores with synchronized sampling control via a single CONVST input, enabling true simultaneous capture of differential channel A (AINP_A/AINM_A) and channel B (AINP_B/AINM_B). Its internal 2.5-V reference (REFOUT) and REFby2 buffer (2.048 V nominal) support precise common-mode setting and eliminate external reference components.

It supports three digital interface modes: SPI-compatible (SDO-0–SDO-7, SCLK, CS, SDI), parallel byte (8-bit data bus), and clock re-timer (READY/STROBE output synchronized to SCLK or internal oscillator), making it interoperable with MCUs, FPGAs, and isolated digital systems without external timing logic.

Key Specifications

Pinout & Package

The ADS9234RIRHBR is housed in a 5-mm × 5-mm, 32-pin VQFN (RHB) package with exposed thermal pad. Pin assignment is identical across the ADS92x4R family and optimized for low-noise analog layout and digital isolation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual simultaneous-sampling ADC applications.

Compared with ADS9224RIRHBR and AD7606C-24BSTZ, the ADS9234RIRHBR uniquely balances 3.5 MSPS speed, 14-bit linearity, integrated reference, and low-latency timing - making it the optimal choice for real-time I/Q demodulation where bandwidth, determinism, and component count are jointly constrained.

Availability

ADS9234RIRHBR is available at Aetrix Electronics and suitable for optical encoders, SONAR receivers, and medical CT detector front-ends requiring stable component supply, extended temperature operation, and long-term production continuity.

Supply support for ADS9234RIRHBR 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, embedded processing, and connectivity technologies with over 90 years of innovation in precision data conversion and industrial signal chain solutions.

The ADS92x4R product line was designed specifically for high-fidelity, low-latency dual-channel acquisition in real-time closed-loop systems - including motor control, ultrasound, optical networking, and test equipment.

FAQ

What is the maximum analog input frequency supported by the ADS9234RIRHBR?

The ADS9234RIRHBR supports analog input frequencies up to 1.5 MHz while maintaining specified AC performance (85.6 dB SNR, 84 dB SINAD). This is enabled by its 52-MHz analog input bandwidth and optimized SAR architecture, making it suitable for baseband I/Q sampling in SONAR and communications systems where signal content extends beyond 1 MHz.

Does the ADS9234RIRHBR require external reference components?

No. The ADS9234RIRHBR integrates a 2.5-V reference (REFOUT), reference buffers (REFP_A/REFP_B, REFM_A/REFM_B), and REFby2 buffer. External decoupling capacitors (1 µF on REFOUT, 10 µF between REFP_x and REFM_x) are required, but no external reference IC or op-amps are needed - reducing BOM count and layout complexity.

How does the ADS9234RIRHBR handle simultaneous sampling of two channels?

The ADS9234RIRHBR uses a single CONVST rising edge to trigger simultaneous sampling on both differential input pairs (AINP_A/AINM_A and AINP_B/AINM_B). Its matched analog front-end and shared reference path ensure <40 ps aperture mismatch and <50 µV channel-to-channel reference mismatch - critical for accurate I/Q phase reconstruction.

Can the ADS9234RIRHBR interface directly with an FPGA using DDR mode?

Yes. The ADS9234RIRHBR supports double-data-rate (DDR) SPI transfers at up to 22 MHz clock rate, with dedicated SDO-x pins and STROBE output synchronized to SCLK. This enables efficient high-throughput data capture in FPGA-based digital downconverters without requiring additional clock domain crossing logic.

What is the power consumption of the ADS9234RIRHBR at full speed?

At 3.5 MSPS with AVDD = 5 V and DVDD = 3.3 V, the ADS9234RIRHBR draws 24.3–30.4 mA from AVDD and 2.8 mA from DVDD - totaling ~170 mW typical. In power-down mode (PD/RST low), supply current drops to 1 µA, supporting energy-efficient burst-mode acquisition in battery-powered edge sensors.