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HomeProductsIntegrated Circuits (ICs)Data Acquisition - Analog to Digital Converters (ADC)ADS1211E
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ADS1211E - Burr Brown

Manufacturer Part Number
ADS1211E
Manufacturer
Burr Brown
Allelco Part Number
32D-ADS1211E
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
13,010 pcs available, New & Original
Parts Description
IC ADC 24BIT SIGMA-DELTA 28SSOP
Package
28-SSOP
Data sheet
-
RoHs Status
 
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In stock: 13010

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Specifications

ADS1211E Tech Specifications
Burr Brown - ADS1211E technical specifications, attributes, parameters and parts with similar specifications to Burr Brown - ADS1211E

Product Attribute Attribute Value
Manufacturer Burr Brown
Voltage - Supply, Digital 5V
Voltage - Supply, Analog 5V
Supplier Device Package 28-SSOP
Series -
Sampling Rate (Per Second) 16k
Reference Type External, Internal
Ratio - S/H:ADC -
Package / Case 28-SSOP (0.209", 5.30mm Width)
Package Bulk
Product Attribute Attribute Value
Operating Temperature -40°C ~ 85°C
Number of Inputs 4
Number of Bits 24
Number of A/D Converters 1
Mounting Type Surface Mount
Input Type Differential
Features PGA
Data Interface SPI
Configuration MUX-PGA-ADC
Architecture Sigma-Delta

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

ADS1211E Image
ADS1211E (1)

Manufacturer Part Number

ADS1211E

Manufacturer

Texas Instruments

Introduction

The ADS1211E is a 24-bit precision analog to digital converter designed for data acquisition in systems requiring high-resolution signal processing.

Product Features and Performance

24-bit resolution enhances high-precision measurements

Sampling Rate up to 16k samples per second offers fast data acquisition

4 differential input channels provide flexible input configuration

Multiplexer-PGA-ADC (MUX-PGA-ADC) configuration for enhanced signal handling

Sigma-Delta architecture ensures high noise immunity and excellent linearity

Programmable Gain Amplifier (PGA) for signal amplification

Supports both External and Internal reference types to accommodate different system requirements

SPI data interface for straightforward digital communication

Compatible with a 5V supply for both analog and digital circuits ensuring simple power management

Product Advantages

High resolution and fast sampling rate ensure detailed and rapid data capture

Flexible input signal configuration through differential inputs and MUX

Enhanced signal quality with built-in PGA and noise-reducing architecture

Easy integration into digital systems with SPI interface

Key Technical Parameters

Number of Bits: 24

Sampling Rate (Per Second): 16k

Number of Inputs: 4

Input Type: Differential

Data Interface: SPI

Voltage - Supply, Analog: 5V

Voltage - Supply, Digital: 5V

Operating Temperature: -40°C ~ 85°C

Quality and Safety Features

Operates effectively in a broad temperature range from -40°C to 85°C

Designed for surface mount technology ensuring robust physical mounting and stability

Compatibility

Suitable for systems requiring SPI interface for digital communication

Application Areas

Industrial process control

High-precision data acquisition systems

Medical instrumentation

Scientific measurement equipment

Product Lifecycle

Status: Last Time Buy

This indicates that the product is nearing the end of its production life and will be discontinued, but replacement or upgrade models may be available

Several Key Reasons to Choose This Product

High-resolution 24-bit ADC ensures detailed measurement capture

Supports multiple input configurations for various application needs

Enhanced durability with a broad operating temperature range

Suitable for a range of high-precision industries including medical and scientific sectors

Easy to integrate with systems due to standard power requirements and digital interface

Offers last time buy opportunity to secure product before discontinuation

Frequently Asked Questions(FAQ)

How does the ADS1211E's 24-bit sigma-delta architecture compare to SAR-based ADCs in terms of noise performance and settling behavior for slow, high-precision sensor applications?
The ADS1211E leverages a 24-bit sigma-delta modulator with integrated programmable gain amplifier (PGA), making it inherently more suitable than SAR ADCs for low-frequency, high-resolution sensing. Sigma-delta converters achieve fine resolution by oversampling and noise shaping, which results in lower in-band noise—critical when measuring small changes from sensors like strain gauges or thermistors. Unlike SAR ADCs, which sample-and-hold circuits can introduce aperture error and require precise settling time relative to the input signal’s slew rate, the ADS1211E's continuous integration nature allows it to reject high-frequency noise without external filtering. For example, at a 16 kSPS output data rate, the effective resolution exceeds 20 bits under typical conditions due to internal oversampling, whereas an equivalent-speed SAR ADC might struggle to maintain 20-bit accuracy without extensive digital post-processing or calibration.
What are the key trade-offs when selecting between internal versus external reference sources for the ADS1211E, particularly in terms of long-term stability, drift, and system cost?
The ADS1211E supports both internal and external references, but the choice significantly impacts measurement reliability over time. The internal bandgap reference offers convenience and reduced board space, with a typical initial accuracy around ±100 ppm (±2.4 LSB at full scale). However, its temperature coefficient is approximately ±50 ppm/°C, leading to potential offset shifts of up to 4 mV across the operating range (-40°C to 85°C). In contrast, precision external references such as the REF5050 can achieve ±25 ppm initial accuracy and ±5 ppm/°C drift, improving linearity and reducing gain error accumulation. While using an external reference increases component count and cost slightly, it enhances system-level precision in applications requiring stable gains over extended periods, such as industrial weighing or environmental monitoring. The decision should consider whether traceability, calibration overhead, or long-term drift dominates design priorities.
Can the ADS1211E drive standard 5V CMOS logic levels directly when interfacing with SPI peripherals, and what precautions are necessary to ensure reliable communication?
Yes, the ADS1211E operates at a nominal 5V supply for both analog and digital domains, allowing it to interface directly with 5V CMOS-compatible microcontrollers and digital logic. Its digital outputs (Dout, SCLK, CS) are compatible with TTL/CMOS logic families, eliminating the need for level shifters in 5V systems. However, timing constraints must be respected: setup and hold times for the serial interface are typically around 15 ns, so clock frequencies above 2 MHz may require careful PCB layout to minimize skew and noise. Additionally, while the device can source sufficient current (~1 mA per pin), pull-up resistors on MISO or CS lines may still be needed if multiple devices share the bus or if signal integrity is compromised due to long traces. Always verify actual rise/fall times against your master’s input thresholds during prototyping.
How does the multiplexed input configuration of the ADS1211E affect channel-to-channel crosstalk and synchronization when acquiring data from multiple sensors simultaneously?
The ADS1211E features a built-in multiplexer that selects one of four differential inputs (AIN0–AIN3) to feed into the PGA and sigma-delta ADC. Since the switching occurs digitally before signal conditioning, there is no physical switch-induced charge injection or leakage present in mechanical multiplexers. As a result, channel isolation remains high (>80 dB typical) even at maximum gain settings, minimizing crosstalk between adjacent channels. However, because only one input is sampled at a time, true simultaneous sampling of all four channels is not possible. If phase alignment matters—such as in bridge sensor arrays where relative offsets could distort readings—users must account for the sequential acquisition latency (~62.5 μs per conversion at 16 kSPS). For most static measurements like pressure or temperature sensing, this delay is negligible, but dynamic signals may require external buffering or a higher-performance alternative.
What impact does power supply ripple have on the ADS1211E’s effective number of bits (ENOB), and how should decoupling be implemented for optimal performance?
The ADS1211E specifies a 5V analog and digital supply rail, with a recommended supply rejection ratio (PSRR) of 70 dB at DC for the analog section. This means that a 100 mV peak-to-peak ripple on the 5V line would introduce approximately 0.01% error in the least significant bit (LSB), equivalent to nearly 1 LSB at full scale. At lower gains (e.g., 1x), this becomes proportionally larger relative to the signal. To mitigate this, use a combination of bulk capacitance (10 µF tantalum or ceramic) near the VDD pins and high-frequency decoupling (0.1 µF X7R/X5R MLCCs) placed within 2 mm of each supply pin. Avoid sharing noisy digital return paths with analog ground; instead, employ a star grounding topology with separate analog and digital planes connected at a single point. Poor decoupling can degrade ENOB by 2–3 bits in marginal designs, especially when driving high-impedance sources.
In what scenarios would substituting the ADS1211E with the ADS1256IDBR be advantageous, given their shared architecture and manufacturer?
Although both the ADS1211E and ADS1256IDBR are sigma-delta ADCs from Texas Instruments, the ADS1256 offers eight differential inputs versus the ADS1211E’s four, doubling channel count without adding new hardware. If your application requires monitoring more than four sensors—such as multi-point temperature arrays or distributed strain networks—the ADS1256 provides better scalability. Additionally, the ADS1256 supports higher data rates (up to 30 kSPS vs. 16 kSPS) and includes built-in diagnostic features like self-test and offset/gain calibration registers. However, the ADS1211E consumes less power (~1 mW active) and fits smaller footprints, making it preferable for portable or space-constrained systems. The substitution trade-off centers on channel density versus power and complexity: choose the ADS1256IDBR when expanding input channels justifies the added silicon area and current draw.
How sensitive is the ADS1211E’s PGA gain setting to input overvoltage, and what protection mechanisms exist beyond external clamping diodes?
The ADS1211E’s internal PGA has input protection limited by internal ESD structures and the absolute maximum rating of ±VCC (typically ±5.5 V). Applying voltages beyond these limits risks latch-up or permanent damage, even momentarily. While external Schottky diodes to VCC and GND can clamp transients, they do not prevent internal node stress during large differential swings. Therefore, always design input ranges well within the specified common-mode voltage (0 V to VCC - 1.2 V for single-ended equivalents). For high-side or wide-range measurements, consider using input attenuators or instrumentation amplifiers ahead of the ADS1211E. Note that at unity gain, the common-mode rejection degrades rapidly if inputs exceed safe levels, potentially causing saturation or nonlinear distortion that corrupts calibration coefficients.
What role does the internal clock oscillator play in the ADS1211E’s operation, and when might users opt to replace it with an external crystal for improved timing accuracy?
The ADS1211E includes a factory-trimmed internal oscillator providing the modulator clock for the sigma-delta ADC. This eliminates the need for an external clock source, simplifying PCB layout and reducing component count. The internal clock has a tolerance of ±0.5% across temperature and aging, sufficient for many sensor applications where absolute frequency precision is secondary to measurement repeatability. However, in systems requiring synchronized multi-device sampling or tight integration with external timing standards (e.g., GPS-timestamped data loggers), replacing the internal clock with a 32.768 kHz crystal improves long-term stability and reduces jitter. External clocks also allow deterministic start-up timing and easier synchronization across multiple ADS1211E units. Users enabling external clock mode must ensure the input meets timing specs: duty cycle ≥40%, rise/fall times <10 ns, and amplitude ≥2 Vpp.
How does the Moisture Sensitivity Level (MSL) rating of MSL 2 for the ADS1211E influence handling procedures during reflow soldering, and what precautions apply?
With an MSL 2 classification, the ADS1211E is considered non-hygroscopic but still requires adherence to JEDEC J-STD-020 guidelines after exposure to ambient humidity. Unsealed packages must be stored in dry environments (<10% RH) and processed within one year of opening. After removal from moisture-protective packaging, bake-out may be required if floor life exceeds 168 hours at 30°C/60% RH. During reflow, peak temperatures must stay below 260°C for ≤10 seconds to avoid delamination or bond wire degradation. These precautions ensure reliability in high-volume manufacturing where uncontrolled storage conditions could compromise solder joint integrity. For prototype work, minimizing open-time and using desiccated trays mitigates risk without mandatory baking.
What considerations arise when cascading multiple ADS1211E devices on a shared SPI bus, particularly regarding daisy-chaining and data framing?
The ADS1211E supports basic SPI communication but lacks native daisy-chain capability, meaning each device requires its own chip-select (CS) line unless decoded via GPIOs. Without hardware daisy chaining, software overhead increases with each additional device due to repeated CS assertions and command sequences. Alternatively, some designers use shift register-based address decoding or I/O expanders to manage multiple CS lines efficiently. When sharing SCLK and MOSI across devices, ensure impedance matching and stub minimization to preserve signal integrity at clock rates approaching 2 MHz. Data framing relies on the user-defined command byte structure: START, MODE, CHANNEL, and GAIN fields must be consistent across all devices. Misaligned frames or incorrect command syntax can lead to misinterpreted channel selections or unintended PGA settings, resulting in erroneous readings.

Parts with Similar Specifications

The three parts on the right have similar specifications to Burr Brown ADS1211E

Product Attribute ADS1211E ADS1211E/1K ADS1211E/1KG4 ADS1211EG4
Part Number ADS1211E ADS1211E/1K ADS1211E/1KG4 ADS1211EG4
Manufacturer Texas Instruments Texas Instruments Texas Instruments Luminary Micro / Texas Instruments
Architecture - Current Source R-2R Pipelined
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Number of Bits - 16 8 14
Configuration - - - S/H-ADC
Series - - - -
Number of A/D Converters - - - 2
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Reference Type - External, Internal External External, Internal
Mounting Type - Surface Mount Through Hole Surface Mount
Input Type - - - Differential
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Voltage - Supply, Analog - 3.14V ~ 3.46V 11.4V ~ 16.5V 3V ~ 3.6V
Ratio - S/H:ADC - - - 1:1
Sampling Rate (Per Second) - - - 65M
Features - - - Simultaneous Sampling
Voltage - Supply, Digital - 1.14V ~ 1.26V 11.4V ~ 16.5V 1.65V ~ 3.6V
Data Interface - LVDS - Parallel I²C LVDS - Parallel, Parallel
Number of Inputs - - - 2

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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ADS1211E Image

ADS1211E

Burr Brown
32D-ADS1211E

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