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Texas Instruments ADS1225IRGVR
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- Part No.:
- ADS1225IRGVR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ADS1225IRGVR.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:798
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Product details
Overview
ADS1225IRGVR from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter with single-channel differential input, internal oscillator, and 2-wire serial interface. It delivers 16SPS in high-resolution mode (4µVRMS noise) or 100SPS in high-speed mode (15µVRMS noise), operates from 2.7V to 5.5V supplies, and features integrated input buffer, temperature sensor, and self-calibration - used in precision portable instrumentation and industrial process monitoring.
For engineers reviewing the ADS1225IRGVR datasheet, ADS1225IRGVR pinout, ADS1225IRGVR application, or ADS1225IRGVR equivalent, this page provides verified technical context, confirmed QFN-16 pin mapping, real-world use-value per application, and two validated alternative parts with documented functional and packaging differences.
Technical Context
The ADS1225IRGVR implements a delta-sigma modulator with programmable gain-free architecture, using an internal 1MHz oscillator for timing control and supporting ratiometric measurements via external VREFP/VREFN inputs. Its single-cycle settling enables deterministic latency of 8.0–83.3ms depending on mode selection.
Conversion is initiated by a 17µs minimum pulse on START; data is output MSB-first on DRDY/DOUT synchronized to SCLK rising edges. The device integrates a chopper-stabilized input buffer (1GΩ impedance when enabled) and a diode-based temperature sensor (106mV at +25°C, 360µV/°C coefficient).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit binary two's complement output - supports ±VREF full-scale range with LSB = VREF/(2²³ − 1) |
| Data Rate | 16SPS (high-resolution mode) or 100SPS (high-speed mode) - fixed-rate operation with no oversampling configuration required |
| Input Noise | 4µVRMS (high-resolution) / 15µVRMS (high-speed) - measured at AVDD=5V, DVDD=3V, VREF=5V, defines effective resolution in noisy environments |
| Analog Input Range | ±VREF differential; absolute input voltage: GND+0.05V to AVDD−1.5V with buffer enabled - constrains external signal conditioning design |
| Supply Voltage | AVDD and DVDD: 2.7V to 5.5V - allows single-supply operation and compatibility with 3.3V or 5V microcontroller interfaces |
| Power Consumption | 1mW typical at 3V (buffer off); <1µA shutdown current - enables battery-powered operation with predictable energy budgeting |
| Operating Temperature | –40°C to +105°C (fully specified) - qualified for industrial and medical-grade embedded deployment |
Pinout & Package
ADS1225IRGVR uses a 4mm × 4mm QFN-16 package (RGV) with exposed thermal pad. Pin numbering follows top-view orientation; pins 5 and 12 are tied to common analog/digital ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| START (1) | Digital input | Pulse-high initiates conversion; low forces automatic shutdown - enables precise timing control and ultra-low-power idle states |
| SCLK (2) | Digital input | Serial clock for data retrieval; rising edge clocks out MSB-first 24-bit result - requires <50ns rise/fall time for reliable sampling |
| DRDY/DOUT (3) | Dual-function digital I/O | Active-low data-ready flag; transitions to data-output after first SCLK rising edge - eliminates need for separate status lines |
| BUFEN (4) | Digital input | Enables chopper-stabilized input buffer - raises differential input impedance from 2MΩ to 1GΩ, reducing source loading |
| GND (5,12) | Ground | Common analog/digital reference plane - requires low-impedance PCB connection to minimize noise coupling |
| TEMPEN (6) | Digital input | Selects internal temperature sensor as MUX input - enables on-chip thermal monitoring without external components |
| MODE (7) | Digital input | Selects operating mode: low = 16SPS/4µVRMS, high = 100SPS/15µVRMS - trade-off between speed and noise performance |
| NC (8,9) | No connect | Unbonded die pads - must remain unconnected and unstubbed on PCB to avoid parasitic coupling |
| AINP1 (10) | Analog input | Positive terminal of single differential input channel - accepts signals within GND+0.05V to AVDD−1.5V (buffer on) |
| AINN1 (11) | Analog input | Negative terminal of single differential input channel - forms differential pair with AINP1; referenced to same ground plane |
| VREFN (13) | Analog input | Negative reference voltage input - defines lower bound of ratiometric measurement range; must be ≥ GND−0.1V |
| VREFP (14) | Analog input | Positive reference voltage input - defines upper bound; supports up to AVDD+0.1V, enabling rail-to-rail reference flexibility |
| AVDD (15) | Analog supply | Primary analog power domain (2.7–5.5V); powers modulator, buffer, and reference circuitry - requires local 0.1µF bypass |
| DVDD (16) | Digital supply | Digital logic supply (2.7–5.5V); powers START, MODE, SCLK, and DRDY/DOUT interface - independent from AVDD for noise isolation |
Key Features
| Feature | Design Value |
|---|---|
| Single-cycle settling | Guarantees deterministic conversion latency (8.0–83.3ms) - simplifies real-time system timing and eliminates software polling uncertainty |
| Integrated temperature sensor | Diode-based sensing with 106mV baseline at +25°C and 360µV/°C coefficient - enables on-die thermal compensation without external ICs |
| Self-calibration | On-command offset/gain calibration triggered by dual SCLK pulses - maintains accuracy across temperature and supply drift without host MCU intervention |
| Ratiometric measurement support | VREFP/VREFN differential reference input - allows direct interfacing with resistive sensors (e.g., RTDs, strain gauges) without precision voltage references |
| Low-noise 24-bit resolution | 4µVRMS noise floor in high-resolution mode - achieves >110dB SNR, sufficient for 0.001% industrial measurement accuracy |
| Simple 2-wire serial interface | DRDY/DOUT + SCLK only - reduces MCU GPIO count and PCB routing complexity versus SPI/I²C alternatives |
Applications
| Hand-Held Instrumentation | Portable Medical Equipment |
|---|---|
Use Scenario: Battery-powered multimeters and handheld analyzers requiring stable, high-resolution DC measurements in field environments. IC Role / Device Role / Timing Role: Primary ADC capturing sensor outputs (e.g., thermocouples, pH electrodes) with ratiometric reference and on-chip temperature compensation. Use Value: 4µVRMS noise and 24-bit resolution enable sub-millivolt DC accuracy; 1mW active power extends battery life beyond 100 hours on two AA cells. |
Use Scenario: Wearable vital sign monitors measuring ECG, skin temperature, or impedance pneumography with strict size and power constraints. IC Role / Device Role / Timing Role: Signal-chain ADC digitizing low-amplitude biopotentials while providing on-die temperature reference for sensor drift correction. Use Value: Integrated temperature sensor (106mV @ +25°C, 360µV/°C) enables real-time thermal compensation; QFN-16 (4×4mm) fits compact wearable PCB layouts. |
| Industrial Process Control | Environmental Monitoring Sensors |
Use Scenario: DIN-rail mounted transmitters converting 4–20mA loop signals or RTD outputs into digital data for PLC or gateway communication. IC Role / Device Role / Timing Role: High-accuracy front-end ADC performing ratiometric measurements against precision reference resistors in harsh industrial settings. Use Value: –40°C to +105°C operating range and 85dB CMRR ensure stability in factory-floor thermal gradients; self-calibration maintains long-term accuracy without field recalibration. |
Use Scenario: Remote air/water quality sensors deployed in unattended outdoor enclosures with limited power budgets and wide ambient temperature swings. IC Role / Device Role / Timing Role: Low-power ADC digitizing gas sensor outputs (e.g., electrochemical cells) while monitoring local temperature for algorithmic compensation. Use Value: <1µA shutdown current enables multi-year operation on primary lithium batteries; internal oscillator eliminates external crystal cost and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1220IPWR | 24-bit, 2-channel MUX, PGA (1–128), no internal oscillator - requires external clock; 0.1µVRMS noise at 20SPS | Supports programmable gain and dual inputs - better suited for multi-sensor systems with varying signal amplitudes | Choose ADS1220IPWR if PGA flexibility and lower noise at reduced data rate are critical; accept added clock sourcing complexity |
| AD7124-4BRUZ | 24-bit, 4-channel MUX, integrated PGA, reference, and diagnostic features; SPI interface; 5.6µVRMS noise at 19.2kSPS (max) | Includes internal reference and comprehensive fault detection - targets safety-critical industrial systems requiring diagnostics | Choose AD7124-4BRUZ when integrated reference, multi-channel capability, and functional safety features outweigh QFN-16 size and 2-wire simplicity |
Compared with ADS1225IRGVR, ADS1220IPWR offers superior noise performance and gain flexibility but lacks internal timing and adds layout overhead; AD7124-4BRUZ provides higher integration and diagnostics at the cost of larger footprint and SPI-only interface - ADS1225IRGVR remains optimal for minimal-footprint, low-pin-count, self-timed precision ADC needs.
Availability
ADS1225IRGVR is available at Aetrix Electronics and suitable for hand-held instrumentation, portable medical equipment, and industrial process control requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.
Supply support for ADS1225IRGVR 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 IC design.
The ADS1225IRGVR belongs to TI's precision delta-sigma ADC product line, engineered for high-resolution, low-power, space-constrained measurement systems where simplicity, reliability, and ratiometric accuracy are prioritized over multi-channel or programmable-gain complexity.
FAQ
What is the maximum differential input voltage range supported by the ADS1225IRGVR?
The ADS1225IRGVR supports a full-scale differential input range of ±VREF, where VREF = VREFP – VREFN. With VREF up to 5V, this yields ±5V input range. Absolute input voltage on AINP1/AINN1 must remain between GND+0.05V and AVDD−1.5V when the input buffer is enabled - exceeding this violates linearity specifications and risks performance degradation.
Does the ADS1225IRGVR require an external crystal or clock source?
No, the ADS1225IRGVR includes a fully integrated oscillator and operates autonomously without external timing components. This eliminates crystal cost, board space, and associated layout sensitivity - making it ideal for compact, low-BOM-count designs where clock stability requirements are met by the internal 1MHz oscillator.
How does the temperature sensor in the ADS1225IRGVR function, and what is its accuracy?
The ADS1225IRGVR uses an on-die diode-based temperature sensor with a nominal output of 106mV at +25°C and a linear coefficient of 360µV/°C. Accuracy depends on system-level calibration; raw output enables relative thermal tracking or coarse absolute measurement - it is not a calibrated standalone sensor but provides consistent drift compensation for analog front ends.
Can the ADS1225IRGVR perform continuous conversions, and how is this configured?
Yes, continuous conversion is enabled by holding the START pin high. Each conversion completes and immediately triggers the next, achieving sustained 16SPS or 100SPS output depending on MODE pin state. During continuous mode, DRDY/DOUT toggles low each time new data is ready, allowing synchronous polling or interrupt-driven readout.
What is the purpose of the BUFEN pin on the ADS1225IRGVR, and when should it be enabled?
The BUFEN pin enables a chopper-stabilized input buffer that raises differential input impedance from 2MΩ to 1GΩ. Enable BUFEN when driving the ADC from high-impedance sources (e.g., thermistors, pH electrodes) to prevent signal attenuation and settling errors - but disable it during low-impedance, high-speed measurements to minimize power and offset drift.
ADS1225IRGVR 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:
- 1
- 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:
- -
ADS1225IRGVR FAQ
1.How can I place an order for ADS1225IRGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1225IRGVR 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 ADS1225IRGVR reliable?
The price and inventory of ADS1225IRGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1225IRGVR is usually 5 days.
3.What payment methods are accepted for ADS1225IRGVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1225IRGVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1225IRGVR?
ADS1225IRGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1225IRGVR 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 ADS1225IRGVR?
For technical support, including ADS1225IRGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1225IRGVR requirements.
6.How does Aetrix verify that ADS1225IRGVR is sourced from the original manufacturer or authorized distributors?
All ADS1225IRGVR 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 ADS1225IRGVR meets industry standards.
7.What is the process for return or replacement of ADS1225IRGVR?
All ADS1225IRGVR units undergo pre-shipment inspection (PSI). If there is an issue with ADS1225IRGVR, 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 ADS1225IRGVR part is unused and in its original packaging.
Return procedure for ADS1225IRGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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