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Texas Instruments REF1925AIDDCR
- Part No.:
- REF1925AIDDCR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
REF1925AIDDCR.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,513
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Product details
Overview
REF1925AIDDCR from Texas Instruments is a dual-output, low-drift, low-power voltage reference IC providing precisely trimmed VREF = 2.5 V and VBIAS = 1.25 V (VREF/2) outputs for single-supply signal conditioning. It delivers ±0.1% initial accuracy, 25 ppm/°C max temperature drift over –40°C to 125°C, and ±20 mA output current capability in a SOT23-5 package. It is used in high-precision ADC biasing, current-sensing front-ends, and industrial data acquisition systems.
For engineers reviewing the REF1925AIDDCR datasheet, REF1925AIDDCR pinout, REF1925AIDDCR application, or REF1925AIDDCR equivalent, key selection criteria include VREF/VBIAS tracking performance (≤7 ppm/°C), ultra-low dropout (10 mV), quiescent current (360 µA), and dual-output stability under load and temperature variation.
Technical Context
The REF1925AIDDCR implements an e-Trim™ band-gap core with two independent buffered outputs: one delivering the full reference voltage (VREF), the other delivering exactly half (VBIAS = VREF/2) via precision resistor networks. Both outputs share the same thermal drift source, enabling tight tracking.
It operates in active mode when EN ≥ VIN – 0.7 V and enters shutdown (5 µA IQ) when EN < 0.7 V; dropout is specified at 10 mV (IL = 20 mA), supporting operation from input voltages as low as VREF + 20 mV. Output impedance remains below 0.1 Ω up to 10 kHz with 1 µF capacitive load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Output | 2.5 V ±0.1% - stable primary reference for ADCs and DACs |
| VBIAS Output | 1.25 V ±0.1% - exact VREF/2 for bipolar signal centering in single-supply systems |
| Temp Drift (VREF/VBIAS) | ±25 ppm/°C max (–40°C to 125°C) - ensures < ±0.03125 V error across full industrial range |
| VREF–VBIAS Tracking | ±7 ppm/°C max (–40°C to 125°C) - maintains ratio integrity critical for ratiometric measurements |
| Quiescent Current | 360 µA typ - enables battery-powered precision sensing with minimal power penalty |
| Dropout Voltage | 10 mV @ 20 mA - allows operation from 2.51 V supply, ideal for low-voltage embedded systems |
| Output Current | ±20 mA per output - supports direct driving of ADC references, op-amp bias networks, and small loads |
Pinout & Package
SOT23-5 package (2.90 mm × 1.60 mm body), surface-mount, moisture-sensitive level 1. Thermal resistance RθJA = 193.6 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VBIAS | Output | Provides 1.25 V reference (VREF/2); sinks/sources ±20 mA; tracks VREF within ±7 ppm/°C |
| 2 - GND | Reference | Analog ground return for both outputs; must be low-impedance and separated from digital ground |
| 3 - EN | Digital Input | Enable control: high (≥VIN – 0.7 V) activates outputs; low (< 0.7 V) disables outputs and reduces IQ to 5 µA |
| 4 - VIN | Power Input | Supply input (2.52 V to 5.5 V); dropout as low as 10 mV enables use with near-threshold supplies |
| 5 - VREF | Output | Primary 2.5 V reference output; identical accuracy, drift, and load capability as VBIAS |
Key Features
| Feature | Design Value |
|---|---|
| Dual matched outputs | VREF = 2.5 V and VBIAS = 1.25 V, both with ±0.1% initial accuracy and identical drift behavior |
| e-Trim™ calibration | Package-level trimming after molding minimizes post-assembly drift and solder-induced offset shifts |
| VREF/VBIAS tracking | ≤7 ppm/°C over –40°C to 125°C - enables accurate ratiometric scaling without external matching |
| Low-noise operation | 12 ppmPP (0.1 Hz–10 Hz) - supports 16-bit+ data acquisition without added filtering overhead |
| Capacitive load stability | Stable with 0–10 µF output capacitance - simplifies layout and eliminates need for external compensation |
Applications
| Industrial Data Acquisition | Single-Supply ADC Biasing |
|---|---|
Use Scenario: High-resolution analog input modules in PLCs and distributed I/O systems measure ±10 V sensor signals using 24-bit sigma-delta ADCs. IC Role / Device Role / Timing Role: REF1925AIDDCR provides VREF for ADC reference and VBIAS to center bipolar inputs at 1.25 V, enabling full-scale utilization of unipolar ADC input range. Use Value: Eliminates discrete resistor dividers and op-amps, reducing board area by >40% while improving temperature-induced gain error by 3× vs. passive solutions. |
Use Scenario: Portable handheld meters digitize thermocouple or strain-gauge outputs with single 3.3 V supply. IC Role / Device Role / Timing Role: REF1925AIDDCR supplies precise 2.5 V reference and 1.25 V common-mode bias to instrumentation amplifier and ADC, enabling true bipolar measurement. Use Value: Maintains < ±0.005% gain error over –25°C to 70°C ambient, meeting Class A portable meter accuracy requirements without calibration. |
| Current Sensing Front-End | Medical Sensor Signal Conditioning |
Use Scenario: Bidirectional motor current monitoring in BLDC inverters using shunt-based sensing and INA213 difference amplifiers. IC Role / Device Role / Timing Role: REF1925AIDDCR powers INA213's VREF pin and sets its output common-mode voltage (VBIAS), defining zero-current output at 1.25 V. Use Value: Enables accurate ±2.5 A measurement with < 0.5% total error over temperature, critical for torque control and fault detection. |
Use Scenario: Patient-worn ECG front-end amplifies microvolt-level biopotentials with rail-to-rail input/output op-amps powered from 3.3 V. IC Role / Device Role / Timing Role: REF1925AIDDCR establishes 2.5 V ADC reference and 1.25 V mid-rail bias for op-amp stages and ADC input, ensuring DC-coupled signal path integrity. Use Value: Reduces baseline wander and common-mode rejection degradation by maintaining < 1 ppm/°C VREF–VBIAS mismatch, directly improving diagnostic SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF1925AIDBVR | SOT23-5 package, same electrical specs, but tape-and-reel packaging optimized for automated assembly; no functional difference | Identical use cases; preferred for high-volume SMT production due to reel compatibility | Select REF1925AIDBVR for volume manufacturing; REF1925AIDDCR is standard cut-tape variant. |
| ADR4525BRZ | Single-output 2.5 V reference (no VBIAS); 2 ppm/°C drift, lower noise (1.2 µVPP), higher cost, SOIC-8 package | Requires external resistor divider + buffer to generate VBIAS; better for ultra-low-drift standalone reference needs | Choose ADR4525BRZ only if sub-5 ppm/°C drift is mandatory and VBIAS can be derived externally. |
Compared with REF1925AIDDCR, REF1925AIDBVR offers identical performance in a production-optimized reel format, while ADR4525BRZ trades dual-output convenience for superior drift and noise-making REF1925AIDDCR optimal for integrated, space-constrained, single-supply precision systems.
Availability
REF1925AIDDCR is available at Aetrix Electronics and suitable for industrial data acquisition, current-sensing front-ends, and medical sensor signal conditioning requiring stable component supply, long-term calibration retention, and consistent SOT23-5 sourcing.
Supply support for REF1925AIDDCR 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 voltage references and signal-chain components.
The REF19xx family was designed specifically for high-accuracy, dual-output biasing in single-supply data acquisition systems-enabling compact, low-power, ratiometric measurement architectures without discrete trimming or matching.
FAQ
What is the output voltage tolerance of REF1925AIDDCR at room temperature?
The REF1925AIDDCR guarantees ±0.1% initial accuracy for both VREF (2.5 V) and VBIAS (1.25 V) outputs at TA = 25°C, as verified per TI SBOS697A datasheet Section 7.5. This corresponds to ±2.5 mV on VREF and ±1.25 mV on VBIAS, measured with IL = 0 mA and VIN = 5 V.
Does REF1925AIDDCR support bidirectional output current?
Yes, REF1925AIDDCR supports ±20 mA output current on both VREF and VBIAS pins. It can source up to +20 mA and sink up to –20 mA while maintaining specified accuracy and regulation, making it suitable for driving ADC references, op-amp bias networks, and small resistive loads in either direction.
How does the enable (EN) pin function on REF1925AIDDCR?
The EN pin places REF1925AIDDCR into active mode when pulled to ≥ VIN – 0.7 V, enabling both outputs. When EN is pulled below 0.7 V, the device enters shutdown mode: outputs go high-impedance and quiescent current drops to 5 µA max. No external pull-up is required-EN is internally biased.
Can REF1925AIDDCR operate from a 2.7 V supply?
Yes, REF1925AIDDCR operates from VIN ≥ VREF + 0.02 V = 2.52 V (min), so 2.7 V is fully supported. At 2.7 V and 20 mA load, dropout remains ≤20 mV (per datasheet Figure 24), ensuring stable 2.5 V and 1.25 V outputs with adequate headroom.
What is the maximum operating temperature range for REF1925AIDDCR?
REF1925AIDDCR is rated for continuous operation from –40°C to +125°C ambient temperature (TA). All key specifications-including output accuracy, drift, tracking, and load regulation-are guaranteed across this full industrial temperature range per SBOS697A Section 7.3.
REF1925AIDDCR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- 12ppmp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.52V ~ 5.5V
- Current - Supply:
- 460µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
REF1925AIDDCR FAQ
1.How can I place an order for REF1925AIDDCR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF1925AIDDCR 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 REF1925AIDDCR reliable?
The price and inventory of REF1925AIDDCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF1925AIDDCR is usually 5 days.
3.What payment methods are accepted for REF1925AIDDCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF1925AIDDCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF1925AIDDCR?
REF1925AIDDCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF1925AIDDCR 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 REF1925AIDDCR?
For technical support, including REF1925AIDDCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF1925AIDDCR requirements.
6.How does Aetrix verify that REF1925AIDDCR is sourced from the original manufacturer or authorized distributors?
All REF1925AIDDCR 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 REF1925AIDDCR meets industry standards.
7.What is the process for return or replacement of REF1925AIDDCR?
All REF1925AIDDCR units undergo pre-shipment inspection (PSI). If there is an issue with REF1925AIDDCR, 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 REF1925AIDDCR part is unused and in its original packaging.
Return procedure for REF1925AIDDCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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