Texas Instruments ADS7951SBRGET

Overview

ADS7951SBRGET from Texas Instruments is a 10-bit, 8-channel, single-ended SAR analog-to-digital converter with 1-MSPS sample rate, zero-latency operation, and programmable input ranges (0 to VREF or 0 to 2×VREF). It integrates a high-input-impedance PGA interface, four configurable GPIOs, and dual per-channel alarm thresholds for real-time monitoring in industrial data acquisition systems.

For engineers reviewing the ADS7951SBRGET datasheet, ADS7951SBRGET pinout, ADS7951SBRGET application, or ADS7951SBRGET equivalent, this device supports fast serial interfacing (20-MHz SCLK), operates from 2.7–5.25 V analog supply and 1.7–5.25 V I/O supply, and delivers 14.5 mW typical power at full speed - critical for PLC, optical line card, and closed-loop control designs.

Technical Context

The ADS7951SBRGET implements a capacitor-based SAR architecture with inherent sample-and-hold, sampling on the falling edge of CS and using SCLK for conversion timing and serial data transfer. Its multiplexer output (MXO) feeds a high-impedance PGA or non-inverting buffer (e.g., THS4031), enabling direct connection to high-Z sensor sources without external buffering.

It supports both auto-sequencing across preselected channels and manual channel selection per conversion cycle. Input range selection (0–VREF or 0–2×VREF) and two programmable alarm thresholds per channel are software-configurable via SPI-compatible SDI/SDO interface, with CS active-low control and GPIO0–GPIO3 supporting alarm signaling and system-level control functions.

Key Specifications

Pinout & Package

ADS7951SBRGET is packaged in a 30-pin TSSOP (DBT) with 7.80 mm × 4.40 mm body size. All pins are electrically validated per TI SLAS605C Rev C datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel SAR ADC applications.

Compared with ADS7952SBRGET and ADS7950SBRGET, the ADS7951SBRGET uniquely balances 10-bit precision, 8-channel count, and full GPIO/alarm feature set in the 30-pin TSSOP package - making it optimal for mid-channel-count industrial DAQ where resolution, integration, and footprint are co-constrained.

Availability

ADS7951SBRGET is available at Aetrix Electronics and suitable for PLC/IPC, optical line card monitoring, and medical instrumentation requiring stable component supply, long-term manufacturability, and TI-qualified industrial-grade performance.

Supply support for ADS7951SBRGET 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 decades of expertise in precision data converters and industrial signal chain solutions.

The ADS79xx family - including ADS7951SBRGET - was designed specifically for high-speed, multi-channel industrial data acquisition, emphasizing zero-latency operation, flexible input scaling, and integrated alarm logic to simplify system-level monitoring.

FAQ

What is the maximum sample rate of the ADS7951SBRGET?

The ADS7951SBRGET achieves a maximum sample rate of 1 MSPS (1 million samples per second) with zero latency. This rate is sustained across all 8 channels in auto-sequencing mode, delivering one complete 8-channel conversion every 8 µs. The device uses a capacitor-based SAR architecture and requires 12 SCLK cycles per 10-bit conversion, supporting up to 20-MHz serial clock frequency.

Does the ADS7951SBRGET require an external reference voltage?

Yes, the ADS7951SBRGET requires an external precision reference applied to the REFP and REFM pins. The datasheet specifies REFP = 2.5 V ± 0.1 V, and the device supports two software-selectable input ranges: 0 to VREF and 0 to 2×VREF. A common choice is the REF5025, which provides a stable 2.5-V reference with low drift and noise - directly referenced in TI's typical application diagrams for ADS7951SBRGET.

How many GPIOs does the ADS7951SBRGET provide, and what are their default functions?

The ADS7951SBRGET provides four GPIOs (GPIO0–GPIO3) in its 30-pin TSSOP (DBT) package. By default, GPIO0 serves as the high-alarm output and GPIO1 as the low-alarm output, both active-high. GPIO2 functions as the Range select input (high = 0–2×VREF, low = 0–VREF), and GPIO3 acts as the active-low power-down (PD) input. All GPIOs are software-reconfigurable via SPI register writes per the ADS7951SBRGET programming model.

What package type and pin count does the ADS7951SBRGET use?

The ADS7951SBRGET is supplied in a 30-pin TSSOP package (orderable code SBRGET), with nominal dimensions of 7.80 mm × 4.40 mm. This package is shared across the 4- and 8-channel variants of the ADS79xx family (e.g., ADS7950, ADS7951), enabling PCB footprint reuse. Pin assignments are fully documented in the SLAS605C datasheet, including dedicated analog inputs (Ch0–Ch3), digital control (CS, SCLK, SDI, SDO), and GPIOs.

Can the ADS7951SBRGET interface directly with a 1.8-V microcontroller?

Yes, the ADS7951SBRGET supports I/O supply voltages from 1.7 V to 5.25 V on the +VBD pin, allowing direct interfacing with 1.8-V microcontrollers without level shifters. Its digital interface (CS, SCLK, SDI, SDO, GPIOs) operates at +VBD logic levels, while the analog section (+VA, AGND, REFP/REFM) remains independent. This dual-supply architecture ensures robust signal integrity and eliminates glue logic in mixed-voltage systems.