Texas Instruments ADS7952SDBTR

Overview

ADS7952SDBTR 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 features a 20-MHz SPI-compatible serial interface, dual input ranges (0 to VREF and 0 to 2×VREF), and four configurable GPIOs in its 30-pin TSSOP package. It is used in high-speed PLC analog input modules requiring deterministic timing and channel sequencing.

For engineers reviewing the ADS7952SDBTR datasheet, ADS7952SDBTR pinout, ADS7952SDBTR application, or ADS7952SDBTR equivalent, key selection considerations include its 12-bit resolution at 1 MSPS, TSSOP-30 package with 4 GPIOs, 2.7–5.25 V analog supply, 1.7–5.25 V I/O supply, and support for auto/manual channel sequencing in industrial data acquisition systems.

Technical Context

The ADS7952SDBTR implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling true zero-latency conversion - output data is valid immediately after SCLK-driven readout without pipeline delay. Its multiplexer accepts up to 12 single-ended analog inputs (Ch0–Ch11), routed to AINP/AINM via internal switching controlled by register settings or hardware sequencing modes.

It supports two software-selectable unipolar input ranges (0 to VREF and 0 to 2×VREF), independent per-channel high/low alarm thresholds, and GPIO0–GPIO3 configured as digital I/O or dedicated functions (Alarm, Low-alarm, Range select, Power-down). The device uses CS-active-low framing and SCLK-synchronized serial communication compatible with standard microcontrollers and DSPs.

Key Specifications

Pinout & Package

ADS7952SDBTR is packaged in a 30-pin TSSOP (DBT) with 7.80 mm × 4.40 mm body size and 0.5 mm pitch. All pins are electrically validated per TI SLAS605C Rev C (July 2018).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7952SDBTR, ADS7953SDBR offers seamless channel scalability within the same PCB footprint, while ADS8684IPWR trades channel density and GPIO flexibility for higher resolution and integrated signal conditioning - making it suitable for distinct precision-tier applications.

Availability

ADS7952SDBTR is available at Aetrix Electronics and suitable for PLC/IPC analog input modules, optical line card telemetry, medical instrumentation, digital power supply monitoring, and multi-channel general-purpose signal acquisition requiring stable component supply and long-term industrial availability.

Supply support for ADS7952SDBTR 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-grade ICs.

The ADS79xx family was designed specifically for high-speed, multi-channel industrial data acquisition - emphasizing deterministic timing, integrated alarm logic, supply flexibility, and robust packaging for harsh environments.

FAQ

What is the maximum sampling rate of the ADS7952SDBTR?

The ADS7952SDBTR achieves a maximum sampling rate of 1 million samples per second (1 MSPS) under specified operating conditions (+VA = 5 V, +VBD = 3 V, fSCLK ≤ 20 MHz). This rate is maintained across all 12 channels in auto-sequencing mode with zero latency, meaning each conversion result is available on the SDO line immediately after the final SCLK edge of that conversion cycle. The device does not require pipeline flush or settling delays between samples.

Does the ADS7952SDBTR support both 0 to VREF and 0 to 2×VREF input ranges?

Yes, the ADS7952SDBTR supports two software-selectable unipolar input ranges: 0 to VREF and 0 to 2×VREF. This selection is controlled via the RANGE pin (GPIO2) or through register configuration, allowing dynamic scaling without external amplification. When using 0 to 2×VREF, the full-scale code corresponds to 2×VREF, and the device maintains 12-bit linearity and monotonicity across the extended span, provided +VA ≥ 2×VREF per datasheet condition.

How many GPIOs does the ADS7952SDBTR provide, and what are their default functions?

The ADS7952SDBTR provides four individually configurable GPIOs (GPIO0–GPIO3) in its 30-pin TSSOP package. By default, GPIO0 serves as an active-high alarm output, GPIO1 as an active-high low-alarm indicator, GPIO2 as the RANGE select input (high = 0 to 2×VREF), and GPIO3 as an active-low power-down control. All GPIOs can be reprogrammed via internal registers to operate as general-purpose inputs or outputs, enabling custom system signaling without additional logic.

What package type and pin count does the ADS7952SDBTR use?

The ADS7952SDBTR is supplied in a 30-pin TSSOP package (orderable code DBT), with nominal dimensions of 7.80 mm × 4.40 mm and 0.5 mm pin pitch. This package is shared across the 4-, 8-, and 12-channel variants of the ADS79xx family, enabling PCB design reuse. Pin functions are fully documented in TI's SLAS605C datasheet, including dedicated analog inputs (Ch0–Ch11), SPI interface (CS, SCLK, SDI, SDO), reference terminals (REFP, REFM), and power domains (+VA, AGND, +VBD, BDGND).

Can the ADS7952SDBTR operate with separate analog and digital supply voltages?

Yes, the ADS7952SDBTR features independent analog and digital power domains: +VA (2.7 V to 5.25 V) powers the SAR core, multiplexer, and reference buffer, while +VBD (1.7 V to 5.25 V) supplies the SPI interface, GPIOs, and control logic. This separation minimizes digital noise coupling into analog measurements and allows direct interfacing with diverse host processors - for example, +VA = 5 V for sensor signal conditioning and +VBD = 1.8 V for low-power FPGA communication - without level-shifting circuitry.