Texas Instruments ADS7953SRHBR

Overview

ADS7953SRHBR from Texas Instruments is a 12-bit, 16-channel, single-ended SAR analog-to-digital converter with 1-MSPS sample rate, zero-latency operation, and dual programmable alarm thresholds per channel. It features a 20-MHz serial interface, 2.7–5.25-V analog supply range, and operates with unipolar input ranges of 0 to VREF or 0 to 2×VREF. It is used in high-speed PLC analog input modules requiring precise multi-channel voltage monitoring.

For engineers reviewing the ADS7953SRHBR datasheet, ADS7953SRHBR pinout, ADS7953SRHBR application, or ADS7953SRHBR equivalent, key selection considerations include its 16-channel count, 12-bit resolution, TSSOP-38 package footprint, GPIO-configurable alarm outputs, and compatibility with isolated industrial signal chains.

Technical Context

The ADS7953SRHBR implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling true zero-latency conversion for closed-loop control. Its serial interface uses CS (active-low), SCLK, SDI, and SDO signals, with sampling triggered on the falling edge of CS and data synchronized to SCLK.

It supports both auto-sequencing across preselected channels and manual channel selection per conversion cycle. Input range selection (0 to VREF or 0 to 2×VREF) is software-controlled via GPIO2 (Range pin), and two independent alarm thresholds per channel are programmable through internal registers.

Key Specifications

Pinout & Package

The ADS7953SRHBR is housed in a 38-pin TSSOP package (9.70 mm × 4.40 mm) with exposed thermal pad. Pin functions are validated per TI SLAS605C Rev C datasheet, Table 7 (TSSOP Packages).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7952SRHBT, the ADS7953SRHBR adds four extra analog inputs while retaining identical timing, power, and software compatibility - ideal for upgrading existing 12-channel designs to full 16-channel capability. Versus ADS8688IPWR, it trades resolution for channel count, alarm integration, and broader supply flexibility.

Availability

ADS7953SRHBR is available at Aetrix Electronics and suitable for industrial PLCs, optical line card monitoring, medical instrumentation, digital power supplies, and high-speed closed-loop systems requiring stable component supply and long-term production continuity.

Supply support for ADS7953SRHBR 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-channel-count, medium-resolution data acquisition in programmable logic controllers, test equipment, and industrial automation - emphasizing robust serial interface, integrated alarms, and flexible power architecture.

FAQ

What is the maximum supported serial clock frequency for ADS7953SRHBR?

The ADS7953SRHBR supports a 20-MHz serial interface clock (SCLK). This allows full 12-bit conversion data transfer within 12 SCLK cycles per sample, enabling reliable operation at the full 1-MSPS sample rate without timing margin violations. The ADS7953SRHBR datasheet specifies t_su1, t_su2, and t_dis timing parameters aligned to this 20-MHz limit under recommended operating conditions.

Does ADS7953SRHBR require an external reference voltage?

Yes, the ADS7953SRHBR requires an external reference applied to REFP and REFM pins. It does not include an internal reference. The device supports reference voltages from 2.0 V to 3.0 V (per datasheet Section 7.6), and common choices include the REF5025 (2.5 V ±0.1 V) or REF5030. Reference stability directly impacts total unadjusted error (TUE) of the ADS7953SRHBR.

How many GPIOs are available on ADS7953SRHBR, and what are their functions?

The ADS7953SRHBR provides four GPIOs (GPIO0–GPIO3) in its 38-pin TSSOP package. GPIO2 configures input range (0 to VREF or 0 to 2×VREF); GPIO0 and GPIO1 serve as active-high alarm outputs; GPIO3 is an active-low power-down input. All are programmable via internal registers, and their functions are defined in the ADS7953SRHBR datasheet Table 12.

Can ADS7953SRHBR operate with separate analog and digital supply voltages?

Yes, the ADS7953SRHBR uses independent analog (+VA) and digital I/O (+VBD) supplies. +VA ranges from 2.7 V to 5.25 V and powers the SAR core and reference buffer; +VBD ranges from 1.7 V to 5.25 V and powers the SPI interface and GPIOs. This separation minimizes digital switching noise coupling into analog measurements - a key design feature of the ADS7953SRHBR.

What is the purpose of the MXO pin on ADS7953SRHBR?

The MXO (Multiplexer Output) pin on ADS7953SRHBR provides buffered access to the analog signal selected by the internal channel multiplexer - prior to sampling by the SAR ADC. This allows external circuitry (e.g., anti-aliasing filters, protection diodes, or high-impedance buffers like THS4031) to be placed between MXO and AINP, preserving signal integrity without loading the multiplexer output. It is a key architectural feature of the ADS7953SRHBR.