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Texas Instruments ADS1226IRGVR
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- Part No.:
- ADS1226IRGVR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ADS1226IRGVR.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,629
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Product details
Overview
ADS1226IRGVR from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter with dual differential input channels (AINP1/AINN1 and AINP2/AINN2), internal oscillator, and integrated temperature sensor. It delivers 4 µVRMS noise in High-Resolution mode (16 SPS) and supports ratiometric measurements via external VREFP/VREFN. It is used in precision industrial process control systems requiring stable, low-drift digitization of two sensor inputs.
For engineers reviewing the ADS1226IRGVR datasheet, ADS1226IRGVR pinout, ADS1226IRGVR application, or ADS1226IRGVR equivalent, key selection considerations include its QFN-16 (4 mm × 4 mm) package, START-triggered single-cycle settling, dual-channel MUX control via dedicated MUX pin, and buffer-enabled 1 GΩ input impedance for high-impedance sensor interfacing.
Technical Context
The ADS1226IRGVR implements a delta-sigma modulator with programmable gain-free architecture, using an internal 2.048 MHz oscillator to drive conversion timing without external clocking. Its two-channel analog multiplexer (controlled by the MUX pin) selects between AINP1/AINN1 and AINP2/AINN2, enabling sequential measurement of independent differential sensors.
Conversion control is hardware-driven: a pulse on START initiates acquisition, DRDY/DOUT signals completion and shifts out 24-bit two's complement data MSB-first over a 2-wire serial interface. The device supports two operating modes-High-Speed (100 SPS, 15 µVRMS) and High-Resolution (16 SPS, 4 µVRMS)-selected via the MODE pin, with automatic shutdown between conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit delta-sigma output; provides 1 ppm of FSR resolution for high-accuracy sensor digitization. |
| Data Rate | 16 SPS (High-Resolution mode) or 100 SPS (High-Speed mode); enables trade-off between noise floor and update rate. |
| Input Noise | 4 µVRMS (High-Resolution mode); supports <10 ppm total error in 5 V full-scale systems. |
| Differential Input Range | ±VREF, where VREF = VREFP – VREFN (0.5 V to AVDD); allows direct ratiometric scaling with bridge or RTD sensors. |
| Input Impedance | 1 GΩ with BUFEN high; eliminates loading errors when interfacing with high-Z sources like thermocouples or pH electrodes. |
| Temperature Sensor | Integrated diode-based sensor with 106 mV output at +25°C and 360 µV/°C coefficient; enables on-chip cold-junction compensation. |
| Supply Range | AVDD and DVDD independently support 2.7 V to 5.5 V; permits mixed-voltage system integration with 3.3 V or 5 V logic. |
| Power Consumption | 1 mW typical during conversion (AVDD = 3 V, buffer off); <1 µA in shutdown for battery-powered instrumentation. |
Pinout & Package
ADS1226IRGVR is housed in a 4 mm × 4 mm RGV (QFN-16) package with wettable flanks and exposed thermal pad. Pin 1 is located at the top-left corner (marked dot), and the package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| START | Digital input | Pulse-high triggers single conversion; low forces automatic shutdown to reduce power to <1 µA. |
| SCLK | Digital input | Serial clock for data retrieval; rising edge clocks out MSB-first 24-bit result on DRDY/DOUT. |
| DRDY/DOUT | Dual-function digital I/O | Active-low DRDY indicates valid data; transitions to DOUT after first SCLK rising edge to shift data. |
| BUFEN | Digital input | High enables chopper-stabilized input buffer, raising differential input impedance to 1 GΩ. |
| MUX | Digital input | Selects analog channel: logic 0 → AINP1/AINN1; logic 1 → AINP2/AINN2 (ADS1226-specific function). |
| TEMPEN | Digital input | High disconnects analog inputs and connects internal diode pair for on-chip temperature measurement. |
| MODE | Digital input | Selects operating mode: low → High-Resolution (16 SPS, 4 µVRMS); high → High-Speed (100 SPS, 15 µVRMS). |
| AINP1 / AINN1 | Analog inputs | Differential channel 1 positive/negative terminals; support ±VREF input range with rail-to-rail common-mode. |
| AINP2 / AINN2 | Analog inputs | Differential channel 2 positive/negative terminals; identical electrical specs to channel 1, selected only when MUX = 1. |
| VREFP / VREFN | Analog inputs | Differential reference inputs; define full-scale range and enable ratiometric accuracy with external references or sensor bridges. |
| AVDD / DVDD | Power supplies | Separate analog (2.7–5.5 V) and digital (2.7–5.5 V) supplies; decoupling required per datasheet layout guidelines. |
| GND | Ground | Common analog/digital ground reference; pins 5 and 12 must be connected to low-impedance PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Two-channel differential MUX | Hardware-selectable AINP1/AINN1 or AINP2/AINN2 via dedicated MUX pin-no software overhead or timing constraints. |
| Single-cycle settling | Full 24-bit data available after one conversion period (16 ms or 10 ms), eliminating need for settling delay in firmware. |
| Self-calibration | On-command offset/gain calibration initiated by two extra SCLK pulses; maintains accuracy across temperature and supply drift. |
| Internal temperature sensor | Diode-based sensor with factory-trimmed 106 mV @ +25°C and 360 µV/°C slope-enables cold-junction compensation without external components. |
| Simple 2-wire serial interface | DRDY/DOUT and SCLK only-reduces MCU GPIO usage and simplifies isolation in high-noise industrial environments. |
| Low-power shutdown | Automatic entry into <1 µA shutdown after conversion completes; ideal for intermittent-sampling battery-powered devices. |
Applications
| Industrial Process Monitoring | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous monitoring of dual pressure transducers in a closed-loop chemical dosing system. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes differential outputs from two isolated 4–20 mA loop-powered sensors, synchronously sampled via START-triggered sequence. Use Value: 4 µVRMS noise and 24-bit resolution enable detection of <0.01% full-scale pressure changes, supporting ISO 5167 compliance. | Use Scenario: Battery-powered handheld blood glucose meter measuring amperometric sensor current. IC Role / Device Role / Timing Role: Digitizes low-current sensor output (nA–µA range) while simultaneously reading onboard temperature for enzymatic reaction compensation. Use Value: Integrated temperature sensor and 1 GΩ buffered input eliminate external op-amps and thermistors, reducing BOM count and board area by 35%. |
| Hand-Held Test Equipment | Smart Industrial Transmitters |
Use Scenario: Multifunction calibrator verifying 4–20 mA HART field devices with simultaneous voltage/current measurement. IC Role / Device Role / Timing Role: Uses AINP1/AINN1 for voltage sensing and AINP2/AINN2 for current shunt sensing, switching via MUX under microcontroller control. Use Value: Ratiometric reference support and 85 dB CMRR ensure accurate readings despite shared ground noise in portable test gear. | Use Scenario: Loop-powered 2-wire smart transmitter for RTD temperature sensing in oil & gas refineries. IC Role / Device Role / Timing Role: Digitizes 3-wire RTD bridge output (AINP1/AINN1) and reads ambient temperature (TEMPEN enabled) for linearization correction. Use Value: Internal oscillator and self-calibration maintain ±0.1°C accuracy over –40°C to +105°C without external crystal or calibration registers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 24-bit delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1220IPWR | Single-channel, no internal oscillator, SPI interface, lower power (350 µA active), no TEMPEN or MUX. | Lacks dual-channel MUX and temperature sensor; requires external clock and separate temp IC for cold-junction compensation. | Choose ADS1220IPWR only if single-input, ultra-low-power, and SPI compatibility are prioritized over dual-sensing and integrated features. |
| AD7124-4BRUZ | 4-channel, 24-bit, built-in PGA (1–128), SPI interface, higher integration (ref buffer, diagnostic), 1.17 mW active power. | Includes programmable gain and diagnostics but lacks dedicated START/MODE pins and uses SPI instead of 2-wire interface. | Choose AD7124-4BRUZ when multi-gain flexibility and fault detection are needed, accepting larger footprint and different interface protocol. |
Compared with ADS1226IRGVR, ADS1220IPWR reduces channel count and removes integrated timing/sensing functions, while AD7124-4BRUZ adds PGA and diagnostics but replaces the simple START-triggered 2-wire interface with SPI-requiring more MCU resources and layout complexity.
Availability
ADS1226IRGVR is available at Aetrix Electronics and suitable for industrial process control, portable medical equipment, and hand-held instrumentation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for ADS1226IRGVR 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 industrial-grade signal chain solutions.
The ADS1226IRGVR belongs to TI's precision delta-sigma ADC product line, designed specifically for high-resolution, low-power, space-constrained measurement systems where dual-sensor digitization and integrated diagnostics are critical.
FAQ
What is the primary functional difference between ADS1226IRGVR and ADS1225IRGVR?
The ADS1226IRGVR integrates a two-channel analog multiplexer (MUX pin) and dedicated AINP2/AINN2 inputs, enabling hardware-switched dual differential measurements. The ADS1225IRGVR has only one differential input pair (AINP1/AINN1) and no MUX pin. Both share identical resolution, noise performance, pinout compatibility (except MUX/AINP2/AINN2), and internal oscillator-making ADS1226IRGVR the direct upgrade for designs needing second-channel capability without firmware rework.
Does ADS1226IRGVR require an external crystal or clock source?
No. ADS1226IRGVR contains a fully integrated 2.048 MHz oscillator and operates autonomously without any external timing components. This eliminates BOM cost, board space, and layout sensitivity associated with crystals or oscillators-critical for compact, battery-powered, or EMI-sensitive applications.
How does the BUFEN pin affect input impedance and measurement accuracy on ADS1226IRGVR?
When BUFEN is high, ADS1226IRGVR enables a chopper-stabilized input buffer, raising differential input impedance to 1 GΩ-preventing loading errors with high-impedance sources like thermocouples or pH electrodes. When BUFEN is low, input impedance drops to 2 MΩ (differential), increasing susceptibility to source impedance-induced gain error and noise coupling.
Can ADS1226IRGVR perform continuous conversions without microcontroller intervention?
Yes. Holding the START pin high places ADS1226IRGVR in free-running mode: it automatically initiates a new conversion immediately after the previous one completes. DRDY/DOUT toggles low each time valid data is ready, allowing polling-based or interrupt-driven readout without timing-critical firmware delays.
What is the role of the TEMPEN pin on ADS1226IRGVR, and how is its output calibrated?
The TEMPEN pin, when driven high, disconnects the analog input MUX and connects internal 1× and 64× scaled diodes to the ADC for on-chip temperature measurement. Its output is factory-trimmed to 106 mV at +25°C with a slope of 360 µV/°C-enabling direct Celsius calculation using VTEMP = 106 mV + (360 µV/°C × ΔT). No external calibration is required.
ADS1226IRGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 100
- Number of Inputs:
- 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 16-VQFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1226IRGVR FAQ
1.How can I place an order for ADS1226IRGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1226IRGVR 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 ADS1226IRGVR reliable?
The price and inventory of ADS1226IRGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1226IRGVR is usually 5 days.
3.What payment methods are accepted for ADS1226IRGVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1226IRGVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1226IRGVR?
ADS1226IRGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1226IRGVR 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 ADS1226IRGVR?
For technical support, including ADS1226IRGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1226IRGVR requirements.
6.How does Aetrix verify that ADS1226IRGVR is sourced from the original manufacturer or authorized distributors?
All ADS1226IRGVR 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 ADS1226IRGVR meets industry standards.
7.What is the process for return or replacement of ADS1226IRGVR?
All ADS1226IRGVR units undergo pre-shipment inspection (PSI). If there is an issue with ADS1226IRGVR, 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 ADS1226IRGVR part is unused and in its original packaging.
Return procedure for ADS1226IRGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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