My Inquiry
My Account
Texas Instruments REF6125IDGKT
- Part No.:
- REF6125IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
REF6125IDGKT.pdf
- Description:
- IC VREF SERIES 0.05% 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:120
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
REF6125IDGKT from Texas Instruments is a high-precision, 2.5-V voltage reference with integrated ADC drive buffer, specified for ±0.05% initial accuracy, 8 ppm/°C max temperature drift (–40°C to +125°C), and <50 mΩ output impedance up to 200 kHz-enabling first-sample 18-bit precision when driving the REF pin of ADS8881 SAR ADCs in burst-mode data acquisition systems.
For engineers reviewing the REF6125IDGKT datasheet, REF6125IDGKT pinout, REF6125IDGKT application, or REF6125IDGKT equivalent, key selection criteria include low droop under dynamic ADC load, verified 5 µVRMS total noise with 47-µF capacitor, programmable short-circuit current limit, and compatibility with ADS88xx and ADS127xx families.
Technical Context
The REF6125IDGKT integrates a bandgap voltage reference core with a low-output-impedance buffer optimized for direct connection to the REF input of precision SAR and delta-sigma ADCs. Its dual-ground architecture (GND_F and GND_S) separates force and sense paths to minimize PCB layout-induced errors.
It features a dedicated FILT pin requiring ≥1 µF capacitor for stability, an SS pin for setting short-circuit current via external resistor, and EN-controlled shutdown with 1 µA quiescent current. The device maintains ≤1 LSB (19.07 µV) droop during the first conversion of ADS8881 at 1 MSPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal-precisely matches 18-bit full-scale range of ADS8881 (1 LSB = 19.07 µV). |
| Initial Accuracy | ±0.05%-ensures ≤3.2 LSB error at 2.5 V before calibration. |
| Temp Drift | 8 ppm/°C max (–40°C to +125°C)-limits drift to ≤2.4 LSB over full industrial temperature range. |
| Total Noise | 5 µVRMS (0.1 Hz–10 kHz, CL = 47 µF)-supports >100 dB SNR in precision DAQ systems. |
| Output Impedance | <50 mΩ (DC–200 kHz)-prevents droop-induced nonlinearity during ADC capacitor switching. |
| Supply Current | 0.82–0.90 mA active mode-enables low-power, high-accuracy operation without thermal derating. |
| Short-Circuit Current | 10.5 mA (SS open)-protects against fault conditions while maintaining drive capability for ADC REF pins. |
Pinout & Package
REF6125IDGKT is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm body size), optimized for space-constrained precision analog layouts with thermal and grounding integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 3 V to 5.5 V supply; dropout voltage ≤600 mV at 4 mA load ensures stable operation with low-headroom rails. |
| EN | Digital enable input | Active-high logic control; transitions reference between 0.9 mA active mode and 1 µA shutdown state. |
| SS | Current-limit programming | External resistor sets short-circuit current threshold-open circuit yields 10.5 mA limit. |
| FILT | Stability filter node | Requires ≥1 µF capacitor to ground; stabilizes internal regulator loop and suppresses high-frequency oscillation. |
| OUT_S | Voltage sense input | High-impedance feedback path for remote sensing-rejects PCB trace IR drop between OUT_F and ADC REF pin. |
| OUT_F | Buffered output force | Low-Z drive pin delivering 2.5 V; connects directly to ADC REF pin with minimal series resistance. |
| GND_F | Force ground return | Carries output current return path-must be routed separately from signal ground to avoid ground bounce. |
| GND_S | Sense ground reference | Provides quiet reference for OUT_S-ties to clean analog ground near ADC to preserve common-mode rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ADC drive buffer | Eliminates need for external op-amp; preserves 18-bit linearity and THD (–125 dB) when driving ADS8881 REF pin. |
| Ultra-low reference droop | ≤1 LSB droop at 1 MSPS with ADS8881-enables accurate first-sample capture in event-triggered DAQ systems. |
| Dual-ground architecture | Separates force (GND_F) and sense (GND_S) grounds-reduces layout sensitivity and improves PSRR by >20 dB. |
| Programmable short-circuit protection | SS pin allows resistor-based current limit tuning-supports system-level fault tolerance without sacrificing drive strength. |
| Low 1/f noise | 3 µVPP/V (0.1 Hz–10 Hz)-minimizes low-frequency drift in DC-coupled sensor front-ends and weigh-scale applications. |
Applications
| ATE Testers and Oscilloscopes | Test and Measurement Equipment |
|---|---|
Use Scenario: High-speed automated test equipment capturing transient waveforms at 1 MSPS with 18-bit resolution. IC Role / Device Role / Timing Role: Supplies stable 2.5-V reference to ADS8881 REF pin during rapid burst sampling triggered by external events. Use Value: Guarantees first-sample accuracy within 1 LSB-eliminates post-acquisition correction and enables real-time pass/fail decisions. |
Use Scenario: Portable multimeters and handheld analyzers requiring calibrated DC voltage measurement across –40°C to +125°C. IC Role / Device Role / Timing Role: Precision voltage source for ratiometric ADC conversions, referenced against internal 2.5-V standard. Use Value: Delivers ±0.05% initial accuracy and 8 ppm/°C drift-meets Class A metrology requirements without factory recalibration. |
| Analog Input Modules for PLCs | Medical Equipment |
Use Scenario: Industrial PLC I/O modules digitizing 4–20 mA sensor signals with 16+ bit resolution in noisy factory environments. IC Role / Device Role / Timing Role: Low-noise, high-PSRR reference for isolated sigma-delta ADCs (e.g., ADS127L01) in channel-dense backplanes. Use Value: 106 dB SNR and –120 dB THD ensure >100 dB effective number of bits (ENOB)-critical for detecting sub-millivolt process anomalies. |
Use Scenario: Patient monitoring devices (ECG, EEG) acquiring low-amplitude bio-signals with DC coupling and long-term stability. IC Role / Device Role / Timing Role: Ultra-stable excitation source for instrumentation amplifiers and anti-aliasing filters in analog front-end chains. Use Value: 80 ppm long-term stability (0–1000 h) and 33 ppm thermal hysteresis support FDA-compliant 5-year calibration intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5025AIDR | No integrated buffer; higher 10 ppm/°C drift; requires external op-amp for ADC drive. | Lacks verified droop performance with ADS88xx; suitable only where buffer is added externally and layout allows. | Select REF5025AIDR only if board area permits discrete buffer design and thermal budget allows higher drift. |
| ADR4525BRZ | 2.5 V, ±0.02% initial accuracy, but no programmable current limit or FILT pin; 3 ppm/°C drift. | Superior accuracy and drift, yet unverified for burst-mode first-sample precision with ADS8881. | Choose ADR4525BRZ for ultra-stable DC references where dynamic ADC loading is absent or mitigated by external circuitry. |
Compared with REF5025AIDR and ADR4525BRZ, REF6125IDGKT uniquely combines integrated buffering, guaranteed 1-LSB droop, and industrial temperature drift in a single 8-pin VSSOP-making it the only solution that eliminates external components while ensuring first-sample 18-bit fidelity in event-triggered DAQ.
Availability
REF6125IDGKT is available at Aetrix Electronics and suitable for precision data acquisition systems, automated test equipment, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for REF6125IDGKT 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 data converter ecosystems.
The REF61xx family-including REF6125IDGKT-is designed specifically to solve dynamic reference droop in high-resolution SAR and delta-sigma ADC systems, targeting test & measurement, industrial automation, and medical DAQ applications.
FAQ
What is the output voltage and tolerance of REF6125IDGKT?
The REF6125IDGKT provides a precise 2.5-V nominal output voltage with ±0.05% initial accuracy at 25°C. This corresponds to a maximum deviation of ±1.25 mV before calibration, and its 8 ppm/°C temperature coefficient ensures drift remains within ±2.4 mV across –40°C to +125°C-critical for maintaining 18-bit accuracy in wide-temperature deployments.
How does REF6125IDGKT reduce reference droop when driving ADCs like ADS8881?
REF6125IDGKT reduces reference droop through an integrated low-output-impedance buffer (<50 mΩ up to 200 kHz) and dual-ground architecture (GND_F/GND_S). When driving the ADS8881 REF pin at 1 MSPS, it limits droop to ≤1 LSB (19.07 µV), enabling first-sample 18-bit precision without external compensation-verified in TI's SBOS747B datasheet Figure 32–34.
What is the purpose of the FILT and SS pins on REF6125IDGKT?
The FILT pin requires a ≥1 µF capacitor to ground to stabilize the internal regulator loop and prevent oscillation. The SS (short-circuit) pin sets output current limit via an external resistor; leaving it open configures REF6125IDGKT for 10.5 mA short-circuit protection-safeguarding both the reference and downstream ADC during fault conditions.
Can REF6125IDGKT operate from a 3.3-V supply?
Yes-REF6125IDGKT supports VIN from 3 V to 5.5 V. At 3.3 V input, its dropout voltage is ≤600 mV at 4 mA load, ensuring reliable 2.5-V output regulation. This makes it compatible with common 3.3-V system rails while maintaining full specification compliance across –40°C to +125°C.
Is REF6125IDGKT pin-compatible with other REF61xx variants?
Yes-REF6125IDGKT shares identical 8-pin VSSOP (DGK) packaging and pinout with REF6130IDGKT, REF6133IDGKT, REF6141IDGKT, REF6145IDGKT, and REF6150IDGKT. Only the output voltage differs (2.5 V, 3.0 V, 3.3 V, 4.096 V, 4.5 V, 5.0 V); all share the same buffer architecture, EN/FILT/SS functionality, and thermal specifications.
REF6125IDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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:
- 4 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 8ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3V ~ 5.5V
- Current - Supply:
- 1.1mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
REF6125IDGKT FAQ
1.How can I place an order for REF6125IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for REF6125IDGKT 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 REF6125IDGKT reliable?
The price and inventory of REF6125IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF6125IDGKT is usually 5 days.
3.What payment methods are accepted for REF6125IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF6125IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF6125IDGKT?
REF6125IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF6125IDGKT 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 REF6125IDGKT?
For technical support, including REF6125IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF6125IDGKT requirements.
6.How does Aetrix verify that REF6125IDGKT is sourced from the original manufacturer or authorized distributors?
All REF6125IDGKT 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 REF6125IDGKT meets industry standards.
7.What is the process for return or replacement of REF6125IDGKT?
All REF6125IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with REF6125IDGKT, 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 REF6125IDGKT part is unused and in its original packaging.
Return procedure for REF6125IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF6125IDGKT Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
