Texas Instruments ADS7829IBDRBT

Overview

ADS7829IBDRBT 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 ±1.25 LSB integral linearity error, 72 dB SINAD at 1 kHz, and operates from 2.0 V to 5.25 V - enabling precision data acquisition in battery-powered sensor interfaces.

For engineers reviewing the ADS7829IBDRBT datasheet, ADS7829IBDRBT pinout, ADS7829IBDRBT application, or ADS7829IBDRBT equivalent, key selection considerations include its 12-bit resolution with guaranteed monotonicity, ultra-low 180 µA quiescent current at 7.5 kHz sampling, 3 × 3 mm SON-8 package, and compatibility with external reference voltages as low as 50 mV.

Technical Context

The ADS7829IBDRBT employs capacitive redistribution SAR architecture with integrated sample-and-hold, fabricated on 0.6 µm CMOS. It acquires and converts analog signals in 12 DCLOCK cycles, requiring 16 clock cycles per full conversion cycle including sampling.

Its pseudo-differential input accepts +In and –In with –In limited to –0.2 V to +1.0 V, supporting remote ground sensing. The SPI-compatible 3-wire serial interface outputs 12-bit straight-binary data MSB-first on DOUT synchronized to the falling edge of DCLOCK, with CS/SHDN controlling chip select and shutdown modes.

Key Specifications

Pinout & Package

ADS7829IBDRBT is housed in an 8-pin 3 × 3 mm PDSO (SON) package - identical in footprint to QFN - optimized for space-constrained PCB layouts and thermal performance in portable systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7829IDRBT and ADS8325IDRCT, the ADS7829IBDRBT uniquely balances 12-bit precision, 180 µA quiescent current at low sampling rates, and 3 × 3 mm footprint - making it optimal for compact, long-life sensor nodes demanding verified ±1.25 LSB linearity.

Availability

ADS7829IBDRBT is available at Aetrix Electronics and suitable for battery-powered sensor interfaces, isolated data acquisition modules, and remote environmental monitoring systems requiring stable component supply and guaranteed long-term availability.

Supply support for ADS7829IBDRBT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The ADS7829IBDRBT belongs to TI's micropower SAR ADC family designed specifically for ultra-low-power, high-accuracy data acquisition in space- and energy-constrained applications - emphasizing minimal quiescent current, small footprint, and guaranteed performance down to 2.0 V supply.

FAQ

What is the maximum sampling rate of the ADS7829IBDRBT?

The ADS7829IBDRBT achieves a maximum sampling rate of 125 kSPS when operating with VCC ≥ 2.7 V. At lower supply voltages (2.0 V ≤ VCC < 2.7 V), the maximum rate drops to 75 kSPS due to internal timing constraints. This specification is guaranteed across the full –40°C to +85°C temperature range and is documented in the SLAS388 datasheet Table "SYSTEM PERFORMANCE" section.

Does the ADS7829IBDRBT support true differential input operation?

No, the ADS7829IBDRBT implements pseudo-differential input architecture: the +IN pin accepts rail-to-rail signals (–0.2 V to VCC + 0.2 V), while the –IN pin is restricted to –0.2 V to +1.0 V and cannot swing rail-to-rail. This configuration supports remote ground sensing and limited common-mode rejection but does not provide full differential input range or common-mode voltage rejection like true differential ADCs.

What is the minimum reference voltage supported by the ADS7829IBDRBT?

The ADS7829IBDRBT supports an external reference voltage as low as 50 mV, as specified in the "REFERENCE INPUT" section of the SLAS388 datasheet. However, using such a low reference reduces LSB size (e.g., 12.2 µV at 50 mV), increasing sensitivity to noise and offset errors - requiring careful PCB layout, low-noise reference sources, and potentially oversampling to maintain effective resolution.

How does the power-down mode function on the ADS7829IBDRBT?

The ADS7829IBDRBT enters full power-down mode when the CS/SHDN pin is driven HIGH, reducing supply current to ≤3 µA. In this state, both analog and digital sections are disabled. Conversion resumes within one DCLOCK cycle after CS falls LOW. This differs from automatic post-conversion sleep, where only the analog section powers down while digital logic remains active - consuming more current unless CS is actively controlled.

Is the ADS7829IBDRBT pin-compatible with other members of the ADS7826/27/29 family?

Yes, the ADS7829IBDRBT shares identical 8-pin SON-8 package, pinout, and interface timing with ADS7826 and ADS7827 variants. All devices use the same VREF, +IN, –IN, GND, CS/SHDN, DOUT, DCLOCK, and +VCC connections. However, resolution (12/10/8-bit), sampling rate (125/200/250 kSPS), and linearity specifications differ - requiring firmware adaptation for data width and timing but no PCB redesign.