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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Texas Instruments ADS7829IDRBT

Name: ADS7829IDRBT
Brand: Texas Instruments
SKU: ADS7829IDRBT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADS7829IDRBT

Manufacturer:: Texas Instruments

Category:: Analog to Digital Converters (ADC)

Package:: 8-VDFN Exposed Pad

Datasheet:: ADS7829IDRBT.pdf

Description:: IC ADC 12BIT SAR 8SON

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ADS7829IDRBT 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 nonlinearity, 72 dB SINAD at 1 kHz, and operates from 2.7 V to 5.25 V - ideal for precision battery-powered data acquisition.

For engineers reviewing the ADS7829IDRBT datasheet, ADS7829IDRBT pinout, ADS7829IDRBT application, or ADS7829IDRBT equivalent, key selection criteria include its 12-bit resolution with guaranteed specs at 2.7 V, ultra-low 60 µW power at 7.5 kHz sample rate, 3 × 3 mm SON-8 package, and compatibility with external reference voltages from 50 mV to V_CC.

Technical Context

The ADS7829IDRBT implements a capacitive redistribution SAR architecture fabricated in 0.6 µm CMOS, integrating a sample-and-hold function inherently. Conversion is initiated by CS/SHDN falling edge, with sampling completed in 1.5 DCLOCK cycles and full conversion requiring 12 DCLOCK cycles.

Its synchronous 3-wire serial interface outputs 12-bit straight-binary data MSB-first on DOUT synchronized to the falling edge of DCLOCK; the first bit after CS assertion is a null bit, followed by 12 valid data bits. Reference input current scales with sample rate, ranging from 0.001 µA (7.5 kHz) to 60 µA (full speed).

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	12-bit - delivers 4096 discrete output codes with monotonic transfer function and no missing codes.
Sample Rate	125 kSPS at V_CC ≥ 2.7 V - supports real-time monitoring of fast transients in sensor interfaces.
INL / DNL	±2 LSB integral linearity, ±2 LSB differential linearity - ensures accurate end-point and step-size fidelity across full scale.
SINAD	72 dB at f_IN = 1 kHz, V_REF = 2.5 V - corresponds to ~11.7 effective number of bits (ENOB) for high-fidelity signal capture.
Supply Range	2.7 V to 5.25 V - enables direct interfacing with 3.3 V or 5 V systems without level-shifting.
Power Down Current	3 µA max - allows deep sleep between conversions to extend battery life in portable instruments.
Reference Range	50 mV to V_CC - permits flexible scaling from low-voltage sensors (e.g., thermocouples) to full-rail inputs.

Pinout & Package

ADS7829IDRBT is housed in an 8-pin 3 × 3 mm PDSO (SON) package - same footprint as QFN - optimized for space-constrained PCB layouts and thermal performance in compact systems.

Pin/Terminal	Circuit Role	Design Meaning
1 - V_REF	Reference voltage input	Defines full-scale analog input span; accepts 50 mV–V_CC; bypassing with 0.1 µF capacitor required for stability.
2 - +IN	Noninverting analog input	Rail-to-rail capable; absolute range –0.2 V to V_CC + 0.2 V; must remain within spec to maintain linearity.
3 - –IN	Inverting analog input	Pseudo-differential input node; limited to –0.2 V to 1.0 V; used for remote ground sensing or common-mode rejection.
4 - GND	Analog/digital ground	Single ground pin; requires low-impedance connection to minimize noise coupling into SAR core.
5 - CS/SHDN	Chip select / shutdown control	Active-low conversion trigger; HIGH forces full power-down mode (3 µA I_DD); LOW initiates sampling and serial output.
6 - DOUT	Serial data output	CMOS output (0 V to V_CC); outputs 12-bit MSB-first data after one null bit; 3-state when CS rises.
7 - DCLOCK	Data clock input	Synchronizes serial data transfer; falling edge clocks valid data; min 10 kHz, max 2 MHz; duty cycle not critical.
8 - +V_CC	Power supply	Supplies analog and digital sections; requires local 0.1 µF ceramic decoupling adjacent to pin.

Key Features

Feature	Design Value
Rail-to-rail pseudo-differential input	Enables direct connection to sensors with wide common-mode swing while rejecting small ground offsets via –IN pin.
Micropower auto power-down	Dissipates <60 µW at 7.5 kHz sample rate (2.7 V), reducing average system power in intermittent-sampling applications.
SPI-compatible 3-wire serial interface	Eliminates need for parallel bus routing; compatible with standard microcontroller SPI peripherals using CS, DCLOCK, and DOUT only.
Ultra-small 3 × 3 mm SON-8 package	Reduces PCB area by >50% vs. SOIC-8; supports high-density layout in handheld test equipment and IoT sensor nodes.
Guaranteed 12-bit performance at 2.7 V	Removes dependency on 5 V rails; simplifies power architecture in modern low-voltage embedded systems.

Applications

Battery-Powered Portable Instrumentation	Isolated Sensor Signal Conditioning
Use Scenario: Handheld multimeter acquiring voltage, current, and temperature readings from multiple sensors with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog signals; triggered by microcontroller via CS/SHDN; serial output synchronized to DCLOCK. Use Value: 12-bit resolution and 72 dB SINAD enable 0.025% measurement accuracy; micropower operation extends battery life beyond 100 hours per charge.	Use Scenario: Industrial current/voltage monitor with galvanic isolation between sensor front-end and host MCU. IC Role / Device Role / Timing Role: Isolated-side ADC converting isolated analog signals; powered locally; communicates via opto-coupled serial lines. Use Value: Rail-to-rail input accommodates wide dynamic range of isolated amplifiers; 3 µA shutdown current minimizes leakage across isolation barrier.
Remote Data Acquisition Node	Simultaneous Multichannel Sampling System
Use Scenario: Wireless environmental sensor node measuring temperature, humidity, and pressure with energy harvesting power source. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated periodically by timer interrupt; samples all channels sequentially before entering shutdown. Use Value: 60 µW active power at 7.5 kHz and 3 µA shutdown current maximize energy efficiency; small SON package reduces overall node size.	Use Scenario: Motor control board acquiring phase currents and bus voltage simultaneously across three channels. IC Role / Device Role / Timing Role: One ADS7829IDRBT per channel; CS lines driven in parallel with staggered DCLOCK to achieve synchronized sampling. Use Value: 125 kSPS throughput and deterministic 12-cycle conversion time ensure precise timing alignment across channels.

Battery-Powered Portable Instrumentation

Isolated Sensor Signal Conditioning

Use Scenario: Handheld multimeter acquiring voltage, current, and temperature readings from multiple sensors with single-cell Li-ion supply.

IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog signals; triggered by microcontroller via CS/SHDN; serial output synchronized to DCLOCK.

Use Value: 12-bit resolution and 72 dB SINAD enable 0.025% measurement accuracy; micropower operation extends battery life beyond 100 hours per charge.

Use Scenario: Industrial current/voltage monitor with galvanic isolation between sensor front-end and host MCU.

IC Role / Device Role / Timing Role: Isolated-side ADC converting isolated analog signals; powered locally; communicates via opto-coupled serial lines.

Use Value: Rail-to-rail input accommodates wide dynamic range of isolated amplifiers; 3 µA shutdown current minimizes leakage across isolation barrier.

Remote Data Acquisition Node

Simultaneous Multichannel Sampling System

Use Scenario: Wireless environmental sensor node measuring temperature, humidity, and pressure with energy harvesting power source.

IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated periodically by timer interrupt; samples all channels sequentially before entering shutdown.

Use Value: 60 µW active power at 7.5 kHz and 3 µA shutdown current maximize energy efficiency; small SON package reduces overall node size.

Use Scenario: Motor control board acquiring phase currents and bus voltage simultaneously across three channels.

IC Role / Device Role / Timing Role: One ADS7829IDRBT per channel; CS lines driven in parallel with staggered DCLOCK to achieve synchronized sampling.

Use Value: 125 kSPS throughput and deterministic 12-cycle conversion time ensure precise timing alignment across channels.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADS7829IBDRBT	Improved INL/DNL: ±1.25 LSB / –1/+1.25 LSB vs. ±2 LSB / ±2 LSB; same package, pinout, and timing.	Higher precision required in metrology-grade instrumentation where end-point linearity is critical.	Select ADS7829IBDRBT when ±1.25 LSB INL is mandatory; otherwise ADS7829IDRBT offers cost-optimized performance.
ADS8325IDRCT	16-bit resolution, 100 kSPS, SPI interface, but requires 5 V supply minimum; larger 16-pin QFN package.	Applications needing higher resolution at lower speed, e.g., precision weigh scales or calibration equipment.	Choose ADS8325IDRCT only if 16-bit resolution outweighs increased power, size, and supply constraints.

Compared with ADS7829IBDRBT, ADS7829IDRBT trades 0.75 LSB INL tolerance for broader availability and lower unit cost; compared with ADS8325IDRCT, it delivers 12-bit precision in half the footprint and one-third the supply voltage - making ADS7829IDRBT optimal for space- and battery-limited 12-bit systems.

Availability

ADS7829IDRBT is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition nodes, and isolated sensor signal conditioning requiring stable component supply and long-term production continuity.

Supply support for ADS7829IDRBT 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 power management technologies.

The ADS7829IDRBT belongs to TI's micropower SAR ADC family designed specifically for high-accuracy, low-power data acquisition in portable, isolated, and multichannel systems operating from single-cell batteries or wide-input supplies.

FAQ

What is the maximum DCLOCK frequency supported by the ADS7829IDRBT?

The ADS7829IDRBT supports a maximum DCLOCK frequency of 2 MHz. At this rate, the device achieves its full 125 kSPS throughput with 12 DCLOCK cycles per conversion and 16-cycle total cycle time. Operation above 2 MHz is not guaranteed and may result in invalid data or timing violations.

Does the ADS7829IDRBT require an external reference voltage?

Yes, the ADS7829IDRBT requires an external reference voltage applied to the V_REF pin. It accepts any stable voltage from 50 mV to V_CC, and the reference directly sets the full-scale input range. Internal reference is not provided; a precision external reference or buffered DAC output is recommended for best accuracy.

Can the ADS7829IDRBT operate from a 2.0 V supply?

Yes, the ADS7829IDRBT can operate from 2.0 V, but with reduced performance: maximum sample rate drops to 75 kSPS, and specifications such as INL and SINAD are not assured below 2.7 V. The datasheet guarantees full 12-bit performance only at V_CC ≥ 2.7 V.

What is the purpose of the –IN pin on the ADS7829IDRBT?

The –IN pin on the ADS7829IDRBT serves as the inverting input for pseudo-differential operation. It is not re-sampled during conversion and is limited to –0.2 V to 1.0 V. Its primary use is remote ground sensing - connecting to a distant ground point to reject small common-mode shifts between sensor and ADC grounds.

How does the power-down mode work on the ADS7829IDRBT?

Power-down mode on the ADS7829IDRBT is activated 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/SHDN transitions LOW again; the device does not retain state or configuration across power-down cycles.

ADS7829IDRBT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-VDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Number of Bits:: 12

Sampling Rate (Per Second):: 125k

Number of Inputs:: 1

Input Type:: Pseudo-Differential

Data Interface:: SPI

Configuration:: S/H-ADC

Ratio - S/H:ADC:: 1:1

Number of A/D Converters:: 1

Architecture:: SAR

Reference Type:: External

Voltage - Supply, Analog:: 2.7V ~ 5.25V

Voltage - Supply, Digital:: 2.7V ~ 5.25V

Features:: -

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 8-SON (3x3)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

ADS7829IDRBT FAQ

1.How can I place an order for ADS7829IDRBT through Aetrix?

Please submit a Request for Quotation (RFQ) for ADS7829IDRBT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ADS7829IDRBT reliable?

The price and inventory of ADS7829IDRBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7829IDRBT is usually 5 days.

3.What payment methods are accepted for ADS7829IDRBT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7829IDRBT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ADS7829IDRBT?

ADS7829IDRBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADS7829IDRBT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ADS7829IDRBT?

For technical support, including ADS7829IDRBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7829IDRBT requirements.

6.How does Aetrix verify that ADS7829IDRBT is sourced from the original manufacturer or authorized distributors?

All ADS7829IDRBT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS7829IDRBT meets industry standards.

7.What is the process for return or replacement of ADS7829IDRBT?

All ADS7829IDRBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7829IDRBT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ADS7829IDRBT part is unused and in its original packaging.

Return procedure for ADS7829IDRBT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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