Texas Instruments ADS7952SRHBT

Overview

ADS7952SRHBT from Texas Instruments is a 12-bit, 12-channel, single-ended SAR analog-to-digital converter with 1-MSPS sample rate, zero-latency operation, and programmable per-channel alarm thresholds. It operates from 2.7 V to 5.25 V analog supply and supports dual unipolar input ranges (0 to VREF and 0 to 2 × VREF), targeting high-speed data acquisition in PLC/IPC systems.

For engineers reviewing the ADS7952SRHBT datasheet, ADS7952SRHBT pinout, ADS7952SRHBT application, or ADS7952SRHBT equivalent, key selection considerations include its 12-channel count, TSSOP-30 package, 20-MHz SPI-compatible serial interface, GPIO-configurable alarm outputs, and compatibility with REF5025 reference voltage sources.

Technical Context

The ADS7952SRHBT implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling true zero-latency conversion-critical for closed-loop control. Its serial interface uses active-low CS for sampling initiation and SCLK for synchronous data transfer, supporting both auto-sequenced and manual channel selection modes.

It features four individually configurable GPIOs (GPIO0–GPIO3) in the TSSOP-30 package, where GPIO2 serves as Range select (0 = 0–VREF, 1 = 0–2×VREF) and GPIO3 as active-low power-down control. Two programmable alarm levels per channel are implemented via internal digital comparators referenced to the ADC output code.

Key Specifications

Pinout & Package

ADS7952SRHBT is packaged in a 30-pin TSSOP (DBT) with 7.80 mm × 4.40 mm body size. Pin functions are validated per TI SLAS605C Rev C (July 2018), confirming full pin compatibility within the ADS795x 12-bit 12-channel subset (ADS7952/ADS7956/ADS7960).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7952SRHBT, ADS7953SRHBT offers immediate scalability without redesign, while ADS8688IPWR trades alarm autonomy and GPIO configurability for higher resolution and wider input range-making each optimal for distinct signal chain architectures.

Availability

ADS7952SRHBT is available at Aetrix Electronics and suitable for PLC/IPC analog input modules, optical line card monitoring systems, and medical instrumentation requiring stable component supply, long-term manufacturability, and TI-qualified industrial-grade performance.

Supply support for ADS7952SRHBT 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 converters and industrial interface solutions.

The ADS79xx family was designed specifically for high-channel-count, medium-speed data acquisition in programmable logic controllers, test equipment, and industrial automation-emphasizing integration, low latency, and flexible digital control.

FAQ

What is the maximum clock frequency supported by the ADS7952SRHBT serial interface?

The ADS7952SRHBT supports a 20-MHz SCLK frequency, enabling full 12-bit conversion and data readout within 1 µs per sample. This timing aligns with its 1-MSPS rated throughput and is verified under recommended operating conditions (+VA = 2.7 V to 5.25 V, +VBD = 1.7 V to 5.25 V). Exceeding 20 MHz may violate setup/hold timing margins specified in Section 7.9 of the SLAS605C datasheet.

Does the ADS7952SRHBT require an external reference voltage, and what are the compatible options?

Yes, the ADS7952SRHBT requires an external reference applied to REFP and REFM pins. TI's REF5025 (2.5 V, ±0.1% initial accuracy, 3 ppm/°C drift) is explicitly recommended in the datasheet's application diagram. Other compatible references include REF5030 (3.0 V) and REF5045 (4.5 V), provided they meet the 10 µF decoupling requirement and remain stable under dynamic load conditions during conversion cycles.

How many analog input channels does the ADS7952SRHBT support, and are they single-ended or differential?

The ADS7952SRHBT supports 12 single-ended analog input channels (CH0–CH11), all routed through an internal multiplexer to the AINP input. While AINM is present, it serves as a dedicated reference node-not a true differential input-and is typically tied to AGND for unipolar operation. The device does not support simultaneous differential channel pairs.

Can the ADS7952SRHBT operate with separate analog and digital supply voltages, and what are the valid ranges?

Yes, the ADS7952SRHBT uses split supplies: +VA (analog core and reference buffer) from 2.7 V to 5.25 V, and +VBD (digital I/O and GPIOs) from 1.7 V to 5.25 V. This separation allows interfacing with 1.8-V FPGAs or 3.3-V microcontrollers while powering the ADC core from a clean 5-V rail-reducing digital noise coupling into sensitive analog measurements.

What GPIO functions are available on the ADS7952SRHBT, and how are they configured?

The ADS7952SRHBT provides four GPIOs (GPIO0–GPIO3) in its TSSOP-30 package. GPIO2 selects input range (0 = 0–VREF, 1 = 0–2×VREF); GPIO3 is an active-low power-down input; GPIO0 and GPIO1 serve as programmable alarm outputs (high-alarm and low-alarm). Configuration is performed via SPI writes to dedicated GPIO control registers, as detailed in Section 8.5 of the SLAS605C datasheet.