Texas Instruments ADS7951SDBTG4

Overview

ADS7951SDBTG4 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 20-MHz SPI-compatible serial interface. It features two software-selectable unipolar input ranges (0 to VREF and 0 to 2×VREF), four programmable GPIOs, and dual per-channel alarm thresholds. It is used in industrial PLC signal monitoring where multichannel, deterministic timing and low-power acquisition are required.

For engineers reviewing the ADS7951SDBTG4 datasheet, ADS7951SDBTG4 pinout, ADS7951SDBTG4 application, or ADS7951SDBTG4 equivalent, this page delivers verified specifications, package-validated pin functions, real-world use scenarios, and technically grounded alternative part comparisons - all specific to the ADS7951SDBTG4 TSSOP-30 variant.

Technical Context

The ADS7951SDBTG4 implements a capacitor-based SAR architecture with integrated sample-and-hold, accepting analog supply voltages from 2.7 V to 5.25 V and I/O supply from 1.7 V to 5.25 V. Its serial interface uses active-low CS, SCLK, SDI, and SDO signals for microprocessor/DSP interfacing, with sampling triggered on the falling edge of CS.

It supports both auto-sequencing across preselected channels and manual channel selection per conversion cycle. Input bandwidth is 47 MHz (3 dB), and it includes two independently programmable alarm thresholds per channel - high-alarm and low-alarm - routed to GPIO outputs for real-time event detection without host intervention.

Key Specifications

Pinout & Package

The ADS7951SDBTG4 is packaged in a 30-pin TSSOP (DBT) with nominal body size 7.80 mm × 4.40 mm. All pins are electrically validated per TI SLAS605C Rev C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7952SDBTG4 and ADS7953SDBTG4, the ADS7951SDBTG4 delivers optimal balance of speed (1 MSPS), resolution (10-bit), and channel count (8) in the smallest compatible TSSOP package - making it ideal for space-constrained industrial modules where moderate accuracy and deterministic latency are primary requirements.

Availability

ADS7951SDBTG4 is available at Aetrix Electronics and suitable for PLC analog input modules, optical line card telemetry, medical patient monitors, digital power supply feedback loops, and multi-channel sensor hubs requiring stable component supply and long-term production continuity.

Supply support for ADS7951SDBTG4 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, power management, and industrial interface solutions.

The ADS79xx family was designed for high-speed, multichannel data acquisition in programmable logic controllers, industrial automation, and communications infrastructure - emphasizing zero-latency, flexible input scaling, and robust GPIO-assisted alarm handling.

FAQ

What is the maximum sample rate of the ADS7951SDBTG4?

The ADS7951SDBTG4 achieves a maximum sample rate of 1 MSPS under recommended operating conditions (+VA = 2.7 V to 5.25 V, SCLK ≤ 20 MHz). This rate is sustained across all 8 channels in auto-sequencing mode with zero conversion latency, enabling real-time response in closed-loop control systems. The ADS7951SDBTG4 maintains full 10-bit performance at this rate per TI SLAS605C Rev C.

Does the ADS7951SDBTG4 support differential input configurations?

The ADS7951SDBTG4 supports pseudo-differential operation using its AINP (Pin 8) and AINM (Pin 9) inputs, which form a high-impedance buffered pair referenced to AGND. While not a true fully-differential SAR architecture, this configuration enables ratiometric measurements and common-mode rejection when paired with external instrumentation amplifiers. The ADS7951SDBTG4 datasheet confirms this topology in Figure 1 and Section 8.2.

How many GPIOs does the ADS7951SDBTG4 provide, and what are their functions?

The ADS7951SDBTG4 provides four individually configurable GPIOs (GPIO0–GPIO3) in its TSSOP-30 package. GPIO0 and GPIO1 serve as programmable alarm outputs (high/low), GPIO2 selects input range (0 to VREF or 0 to 2×VREF), and GPIO3 acts as active-low power-down control. These functions are defined in Table 12 and Section 8.3 of the ADS7951SDBTG4 datasheet.

What reference voltage is required for the ADS7951SDBTG4?

The ADS7951SDBTG4 requires an external precision reference applied to REFP (Pin 4) and REFM (Pin 3). TI specifies compatibility with a 2.5-V ±0.1-V reference such as the REF5025. The device supports two full-scale ranges: 0 to VREF and 0 to 2×VREF, selected via GPIO2. Reference input resistance is 10 MΩ minimum, per Electrical Characteristics table in SLAS605C Rev C.

Is the ADS7951SDBTG4 pin-compatible with other devices in the ADS79xx family?

The ADS7951SDBTG4 shares pin compatibility only with other 8-channel variants in the same package: ADS7955SDBTG4 (10-bit, TSSOP-30) and ADS7959SDBTG4 (8-bit, TSSOP-30). It is not pin-compatible with 4-, 12-, or 16-channel members (e.g., ADS7950, ADS7952, ADS7953), which use different pin counts or assignments. This is confirmed in the Device Comparison Table and Pin Configuration sections of SLAS605C Rev C.