Texas Instruments ADS9226IRHBR

Overview

ADS9226IRHBR from Texas Instruments is a 16-bit, dual-channel, simultaneous-sampling SAR ADC with 2.048 MSPS throughput, 488 ns latency, and pseudo-differential unipolar inputs. It integrates reference buffers, operates from 4 V to 5.5 V AVDD, and targets high-precision position feedback in servo drives and telecom optical modules.

For engineers reviewing the ADS9226IRHBR datasheet, ADS9226IRHBR pinout, ADS9226IRHBR application, or ADS9226IRHBR equivalent, this page delivers verified timing performance (488 ns latency), dual-channel synchronization integrity, SPI-compatible enhanced-SPI interface behavior, and VQFN-32 package–specific layout guidance for high-speed analog acquisition systems.

Technical Context

The ADS9226IRHBR implements two independent SAR conversion cores sharing a common internal clock, enabling true simultaneous sampling with <±0.5 LSB offset error matching and <0.2%FSR gain error matching. Its pseudo-differential input structure uses 16-pF sampling capacitance per channel and supports full-scale range = ±VREFIN with bias at VREFIN ± 0.1 V.

Reference buffering is implemented via dual on-chip buffers (REFBUF_A/REFBUF_B) driving REFP_A/REFP_B outputs, each requiring a dedicated 10-µF decoupling capacitor to REFM_x. The enhanced-SPI interface delivers left-justified 16-bit data across four SDO lines (SDO-0A/1A/0B/1B) with configurable 0- or 1-sample latency controlled by CS pulse width.

Key Specifications

Pinout & Package

VQFN-32 (RHB), 5.00 mm × 5.00 mm body, exposed thermal pad connected to PCB ground. Pin pitch: 0.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7606C-16 and ADS8686S, the ADS9226IRHBR uniquely delivers sub-500 ns latency with guaranteed simultaneous sampling - making it the only option among the three for real-time servo position loop closure and I/Q signal processing where timing coherence is non-negotiable.

Availability

ADS9226IRHBR is available at Aetrix Electronics and suitable for servo drive position feedback, telecom optical module telemetry, and power quality analyzer designs requiring stable component supply, extended temperature operation, and high-speed dual-channel synchronization.

Supply support for ADS9226IRHBR 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 company specializing in analog and embedded processing technologies, with leadership in precision data converters and industrial-grade ICs.

The ADS9226IRHBR belongs to TI's high-performance SAR ADC product line, designed specifically for real-time control and high-fidelity signal acquisition in servo drives, optical communications, and power electronics.

FAQ

What is the maximum sampling rate supported by the ADS9226IRHBR?

The ADS9226IRHBR supports a maximum sampling rate of 2.048 MSPS, achieved using latency-1 data capture mode with appropriate CS pulse timing. This rate is specified across the full –40°C to +125°C temperature range and requires SCLK up to 32.768 MHz. At lower throughput, the device maintains its 16-bit no-missing-codes performance and 90.8-dB SNR specification.

Does the ADS9226IRHBR require an external reference voltage?

Yes, the ADS9226IRHBR requires an external reference voltage applied to the REFIN pin, with recommended values between 1.4 V and AVDD/1.75 – 0.2 V (e.g., 2.5 V when AVDD = 5 V). The device includes integrated reference buffers that drive REFP_A and REFP_B, but these buffers depend on the external VREFIN source - no internal reference generator is present in the ADS9226IRHBR.

How does the ADS9226IRHBR achieve simultaneous sampling across both channels?

The ADS9226IRHBR achieves true simultaneous sampling through independent sample-and-hold circuits for each channel, triggered by the same internal conversion clock and CS edge. Both AINP_A/AINM_A and AINP_B/AINM_B inputs are acquired at identical instants, with <±0.5 LSB offset error matching and matched acquisition timing - confirmed in TI's SBAS842 datasheet Section 6.5 and Figure 7-1 functional block diagram.

What package type and thermal characteristics does the ADS9226IRHBR use?

The ADS9226IRHBR uses a 5-mm × 5-mm, 32-pin VQFN (RHB) package with an exposed thermal pad. Its thermal metrics include RθJA = 29°C/W, RθJB = 9.4°C/W, and RθJC(bot) = 0.8°C/W. TI recommends soldering the thermal pad directly to a large PCB ground plane to maintain junction temperature within limits under full 2.048-MSPS operation at +125°C ambient.

Can the ADS9226IRHBR interface directly with an FPGA without level-shifting?

Yes, the ADS9226IRHBR's DVDD supply range (1.65 V to 5.5 V) and digital I/O thresholds (VIH = 0.7 × DVDD, VIL = 0.3 × DVDD) allow direct interface with 1.8-V, 2.5-V, or 3.3-V FPGAs. When DVDD = 3.3 V, VIH(min) = 2.31 V and VIL(max) = 0.99 V - compatible with standard LVCMOS33 I/O banks. No external level shifters are required if FPGA I/O banks are configured to match the ADS9226IRHBR's DVDD voltage.