Texas Instruments ADS8331IBRGET

Overview

ADS8331IBRGET from Texas Instruments is a low-power, 16-bit, 500-kSPS successive approximation register (SAR) analog-to-digital converter with integrated 4-channel unipolar multiplexer, on-chip conversion clock, and SPI/DSP-compatible serial interface. It operates from 2.7 V to 5.5 V analog supply, delivers ±1.2 LSB typical INL and 91.5 dB SNR at 1 kHz, and targets precision data acquisition in space-constrained industrial sensor interfaces.

For engineers reviewing the ADS8331IBRGET datasheet, ADS8331IBRGET pinout, ADS8331IBRGET application, or ADS8331IBRGET equivalent, key selection considerations include its 4-channel mux architecture, 24-pin VQFN (4 mm × 4 mm) package, daisy-chain capability, programmable EOC/INT polarity, and support for auto/manual channel triggering in embedded measurement systems.

Technical Context

The ADS8331IBRGET implements a capacitor-based SAR ADC core with inherent sample-and-hold, enabling single-cycle 16-bit conversions at up to 500 kSPS. Its internal conversion clock runs at 10.5–12.2 MHz (VA = 2.7 V), and it supports both external SCLK-driven and internal CCLK-driven operation modes.

It features a flexible analog input path with four dedicated MUX inputs (IN[0:3]), common-mode input (COM), and MUX output (MUXOUT) for breakout routing. Digital control includes global CONVST independent of CS, software/hardware reset, and three power-down modes (Deep, Nap, Auto-NAP) with sub-μA quiescent current.

Key Specifications

Pinout & Package

The ADS8331IBRGET is housed in a 24-pin VQFN package (4.00 mm × 4.00 mm) with exposed thermal pad connected to AGND. Pin functions are electrically identical to the TSSOP variant but optimized for compact PCB layout and thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8341IPW and ADS8684IPWR, the ADS8331IBRGET uniquely balances 500-kSPS speed, integrated CCLK, daisy-chain support, and 4×4 mm VQFN packaging-making it optimal for space-constrained, multi-node precision acquisition where timing autonomy and layout efficiency are prioritized.

Availability

ADS8331IBRGET is available at Aetrix Electronics and suitable for industrial process controls, medical instruments, and communications test equipment requiring stable component supply and guaranteed long-term manufacturability.

Supply support for ADS8331IBRGET 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 conversion and industrial-grade reliability.

The ADS8331IBRGET belongs to TI's low-power, high-speed SAR ADC family designed specifically for high-accuracy, multi-channel data acquisition in harsh industrial and medical environments-emphasizing noise immunity, thermal stability, and flexible digital interfacing.

FAQ

What is the maximum SCLK frequency supported by the ADS8331IBRGET?

The ADS8331IBRGET supports up to 40 MHz SCLK when VA = VBD = 5 V and SCLK is used solely as an I/O clock. When SCLK also serves as the conversion clock, the maximum is 21 MHz. At VA = 2.7 V, the I/O-only limit is 25 MHz. These values are specified in the Electrical Characteristics tables and validated across the full –40°C to +85°C operating range for the ADS8331IBRGET.

Does the ADS8331IBRGET require an external reference voltage?

Yes, the ADS8331IBRGET requires an external reference applied between REF+ and REF− pins. It accepts references from 1.2 V to 4.096 V (or up to VA), with optimal performance at 2.5 V (VA = 2.7 V) or 4.096 V (VA = 5 V). The device has no internal reference; REF− must be connected to AGND through a dedicated PCB via to maintain PSRR and INL performance for the ADS8331IBRGET.

How does the daisy-chain mode work on the ADS8331IBRGET?

In daisy-chain mode, the SDO of one ADS8331IBRGET connects to the SDI of the next device, while all share the same SCLK and FS/CS lines. The EOC/INT/CDI pin of downstream devices is configured as CDI. Data is shifted out sequentially-enabling readback of multiple 16-bit results with a single SPI transaction-reducing host processor overhead and eliminating per-device CS routing for the ADS8331IBRGET.

What power-down modes are available on the ADS8331IBRGET, and how do they differ?

The ADS8331IBRGET offers Deep PD (50–250 nA), Nap (325–500 µA), and Auto-NAP (3.25 mA at 250 kSPS) modes. Deep PD halts all internal clocks and resets registers; Nap retains register state and enables fast wake-up; Auto-NAP automatically toggles between active and Nap states based on sampling interval. All three are accessible via SPI command or hardware RESET for the ADS8331IBRGET.

Is the ADS8331IBRGET pin-compatible with the ADS8332IBRGET?

No-the ADS8331IBRGET and ADS8332IBRGET share identical pinouts and package footprints (24-pin VQFN), but their IN[0:3] pins map to different physical locations: ADS8331IBRGET uses pins 1–3 and 24 for IN0–IN3, while ADS8332IBRGET uses pins 1–4 and 24 for IN0–IN4. This difference prevents direct substitution without PCB revision, though firmware and layout can be reused with minor signal reassignment for the ADS8331IBRGET.