Texas Instruments ADS7829IDRBR

Overview

ADS7829IDRBR from Texas Instruments is a 12-bit, 125 kSPS successive approximation register (SAR) analog-to-digital converter with pseudo-differential rail-to-rail input, SPI-compatible serial interface, and micropower operation at 2.7 V supply. It features ±2 LSB integral linearity error, 72 dB SINAD at 1 kHz, and operates from 2.7 V to 5.25 V - ideal for precision battery-powered sensor front-ends.

For engineers reviewing the ADS7829IDRBR datasheet, ADS7829IDRBR pinout, ADS7829IDRBR application, or ADS7829IDRBR equivalent, key selection considerations include its 12-bit resolution with no missing codes, 25 pF analog input capacitance, 3 µA max power-down current, 8-pin SON package, and compatibility with external reference voltages from 50 mV to VCC.

Technical Context

The ADS7829IDRBR implements capacitive redistribution SAR architecture on 0.6 µm CMOS, integrating sample/hold functionality without requiring external components. Its conversion cycle requires exactly 12 DCLOCK cycles for acquisition and conversion, followed by 16-cycle serial output timing including one null bit and 12 data bits MSB-first.

It uses a synchronous 3-wire serial interface (CS/SHDN, DCLOCK, DOUT) with data valid on the falling edge of DCLOCK. The -In input is limited to –0.2 V to +1.0 V and functions as remote ground sense rather than full differential common-mode rejection, while +In accepts rail-to-rail signals up to VCC + 0.2 V.

Key Specifications

Pinout & Package

ADS7829IDRBR is housed in an 8-pin 3 × 3 mm PDSO (SON) package - ultra-small footprint compatible with space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7822U and ADS7816U, the ADS7829IDRBR uniquely combines 125 kSPS throughput, 3 µA shutdown, pseudo-differential input, and 3 × 3 mm SON packaging - making it optimal for compact, long-life, multi-sensor embedded systems.

Availability

ADS7829IDRBR is available at Aetrix Electronics and suitable for battery-operated sensor nodes, isolated data acquisition modules, and remote telemetry systems requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.

Supply support for ADS7829IDRBR 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 low-power design.

The ADS7829IDRBR belongs to TI's micropower SAR ADC product line, engineered specifically for energy-constrained applications demanding high resolution, small size, and robust performance across industrial temperature ranges.

FAQ

What is the maximum DCLOCK frequency supported by the ADS7829IDRBR?

The ADS7829IDRBR supports a maximum DCLOCK frequency of 2 MHz, as specified in the SLAS388 datasheet. This enables its full 125 kSPS throughput, since each conversion requires 12 DCLOCK cycles for acquisition/conversion plus 16 cycles for serial output. Operating above 2 MHz may cause timing violations and invalid data.

Does the ADS7829IDRBR require an external reference voltage?

Yes, the ADS7829IDRBR requires an external reference voltage applied to the Vref pin. It accepts any stable voltage from 50 mV to VCC, and the reference directly sets the full-scale input range. Internal reference is not provided - precision and flexibility depend on the external reference source.

Can the ADS7829IDRBR operate from a 2.0 V supply?

Yes, the ADS7829IDRBR is specified to operate from 2.0 V, though with reduced performance: maximum sample rate drops to 75 kSPS, and reference voltage range narrows to 1.024 V–1.25 V. Full 125 kSPS and ±2 LSB linearity are guaranteed only at VCC ≥ 2.7 V.

What is the purpose of the –In pin on the ADS7829IDRBR?

The –In pin on the ADS7829IDRBR serves as a pseudo-differential reference point with a limited voltage range (–0.2 V to +1.0 V). It is intended for remote ground sensing-not full differential common-mode rejection-allowing rejection of small ground potential differences between sensor and ADC locations.

How does the power-down mode function on the ADS7829IDRBR?

The ADS7829IDRBR enters full power-down mode when CS/SHDN is driven HIGH, reducing supply current to ≤3 µA. In this state, both analog and digital sections are disabled. Conversion resumes only after CS transitions LOW again, initiating a new sample-and-hold cycle.