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Texas Instruments REF6141IDGKT
- Part No.:
- REF6141IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
REF6141IDGKT.pdf
- Description:
- IC VREF SERIES 0.05% 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:446
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Product details
Overview
REF6141IDGKT from Texas Instruments is a high-precision, 4.096 V voltage reference with integrated ADC drive buffer, ±0.05% initial accuracy, 8 ppm/°C max temperature drift (–40°C to +125°C), and <50 mΩ output impedance (DC–200 kHz). It delivers ±4 mA output current and drives the REF pin of ADS8881 SAR ADC with first-sample precision to 18 bits in burst-mode data acquisition systems.
For engineers reviewing the REF6141IDGKT datasheet, REF6141IDGKT pinout, REF6141IDGKT application, or REF6141IDGKT equivalent, this device is selected for ultra-low droop, low-noise (<5 µVRMS), and verified compatibility with precision SAR and delta-sigma ADCs including ADS88xx and ADS127xx families - critical for test equipment, medical DAQ, and industrial analog input modules.
Technical Context
The REF6141IDGKT integrates a bandgap voltage reference core with a low-output-impedance buffer optimized for dynamic ADC reference loading. Its architecture eliminates external buffering while preserving linearity and noise performance during capacitor-switching events on the ADC's REF pin.
It supports programmable short-circuit current via the SS pin, uses dual ground pins (GND_F/GND_S) for force-sense separation, and requires ≥1 µF CFILT between FILT and GND for stability. The buffer enables direct drive of ADS8881 at 1 MSPS with ≤1 LSB droop - validated by TI's reference droop characterization at full-scale inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V - precisely matches 16-bit full-scale resolution (2¹⁶ = 65536) for seamless scaling with 16/18-bit SAR ADCs like ADS8881. |
| Initial Accuracy | ±0.05% - ensures ≤±2.05 mV absolute error at 25°C, reducing calibration burden in high-end test and measurement systems. |
| Temp Drift | 8 ppm/°C max (–40°C to +125°C) - guarantees ≤±3.3 ppm total drift over industrial temperature range, supporting ATE and PLC applications. |
| Output Impedance | <50 mΩ (DC–200 kHz) - sustains stable REF voltage during fast capacitor switching in SAR ADCs, preventing first-sample nonlinearity. |
| Total Noise | 5 µVRMS (with 47 µF CL) - enables >100 dB SNR in ADC systems (e.g., 100.5 dB with ADS8881), critical for precision signal chain integrity. |
| Supply Current | 0.82–0.90 mA active mode - balances ultra-low noise with power efficiency for battery-backed or thermally constrained DAQ designs. |
| Shutdown Current | 1–3 µA - allows low-power sleep states in portable or event-triggered acquisition without compromising wake-up stability. |
Pinout & Package
VSSOP-8 package (3.00 mm × 3.00 mm), thermally enhanced for industrial ambient operation; pinout designed for low-noise layout with separate force/sense grounds and dedicated filter capacitor connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies reference core and buffer; requires VIN ≥ VOUT + 0.25 V (min 4.346 V) for REF6141 operation. |
| EN | Digital enable input | Active-high logic control: EN ≥ 1.6 V enables device; EN ≤ 0.6 V places REF6141IDGKT in shutdown (1–3 µA ICC). |
| SS | Short-circuit limit programming | Resistor-connected pin sets output current limit; open-circuit configures 10.5 mA max short-circuit current. |
| FILT | Filter capacitor node | Connects ≥1 µF capacitor to GND to stabilize internal regulator; essential for noise and transient performance. |
| OUT_S | Voltage sense input | Feedback path for output voltage regulation; connects to high-impedance point (e.g., ADC REF pin) to minimize loading error. |
| OUT_F | Voltage force output | Low-impedance buffered output driving ADC REF pin directly; maintains regulation under dynamic load transients. |
| GND_F | Force ground | Return path for OUT_F current; must be routed separately from signal ground to avoid ground bounce coupling. |
| GND_S | Sense ground | Reference ground for OUT_S feedback; ties to clean analog ground near ADC REF pin to close regulation loop accurately. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ADC drive buffer | Eliminates need for external op-amp; enables direct, low-noise REF pin drive for ADS88xx/ADS127xx ADCs without layout complexity or stability risk. |
| First-sample 18-bit precision | Guarantees ≤1 LSB droop with ADS8881 at 1 MSPS - verified across full-scale positive/negative inputs - enabling true burst-mode DAQ. |
| Ultra-low 1/f noise | 3 µVPP/V (0.1 Hz–10 Hz) - minimizes low-frequency drift in DC-coupled medical and sensor front-ends where baseline stability is critical. |
| Programmable short-circuit protection | SS pin resistor sets current limit from ~2 mA to 10.5 mA - protects REF6141IDGKT and downstream circuitry during fault conditions. |
| Dual ground architecture | GND_F/GND_S separation reduces ground-loop errors and improves PSRR by isolating high-current buffer return from sensitive feedback path. |
Applications
| Burst-Mode Data Acquisition | High-Accuracy Test Equipment |
|---|---|
Use Scenario: Event-triggered sampling in oscilloscopes or ATE systems capturing short-duration signals with minimal dead time. IC Role / Device Role / Timing Role: Provides stable, low-droop reference voltage to ADS8881 REF pin during first conversion cycle after trigger. Use Value: Ensures 18-bit effective resolution on initial sample without averaging or delay - critical for transient capture fidelity. |
Use Scenario: Precision voltage sourcing and measurement in benchtop multimeters and calibration standards. IC Role / Device Role / Timing Role: Serves as primary reference for DAC-based output stages and ADC-based input digitization. Use Value: ±0.05% initial accuracy and 8 ppm/°C drift support Class I metrology-grade specifications over extended temperature ranges. |
| Industrial Analog Input Modules | Medical Signal Conditioning |
Use Scenario: 16-/18-bit isolated analog inputs in PLCs and distributed I/O systems operating in harsh factory environments. IC Role / Device Role / Timing Role: Supplies reference for multi-channel SAR ADCs sharing common REF bus with minimal crosstalk. Use Value: Low output impedance (<50 mΩ) prevents channel-to-channel gain error caused by REF pin loading variations. |
Use Scenario: ECG, EEG, and patient monitor front-ends requiring ultra-stable, low-noise excitation and digitization. IC Role / Device Role / Timing Role: References precision instrumentation amplifiers and sigma-delta ADCs (e.g., ADS127L01) in biopotential chains. Use Value: 5 µVRMS total noise and 106 dB SNR (with ADS127L01) meet IEC 60601-2-27 low-noise requirements for diagnostic-grade devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF6145IDGKT | 4.5 V output, same 8 ppm/°C drift and ±0.05% accuracy, but lower output current (±3.5 mA) and higher dropout voltage. | Preferred when system supply rails support 4.5 V reference scaling (e.g., 18-bit systems with 2⁶⁵× full-scale), not 4.096 V. | Select REF6145IDGKT only if 4.5 V output aligns with ADC full-scale range and system headroom permits higher dropout. |
| REF6041IDGKT | No integrated buffer; 4.096 V output, 5 ppm/°C drift, ±0.02% accuracy, but requires external op-amp for ADC drive and exhibits higher droop. | Suitable for static or low-throughput applications where buffer integration is unnecessary and tighter drift is prioritized. | Choose REF6041IDGKT only when lowest possible drift (5 ppm/°C) outweighs need for integrated buffer and first-sample precision. |
Compared with REF6145IDGKT and REF6041IDGKT, REF6141IDGKT uniquely combines 4.096 V output, integrated buffer, and guaranteed ≤1 LSB droop with ADS8881 - making it the optimal choice for burst-mode, 16/18-bit SAR-based DAQ where timing-critical reference stability is non-negotiable.
Availability
REF6141IDGKT is available at Aetrix Electronics and suitable for precision data acquisition systems, automated test equipment, and industrial analog input modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for REF6141IDGKT 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 was engineered specifically to solve dynamic reference loading challenges in high-resolution SAR and delta-sigma ADCs - delivering integrated buffering, ultra-low noise, and guaranteed first-sample accuracy for demanding DAQ applications.
FAQ
What is the output voltage tolerance and temperature coefficient of REF6141IDGKT?
The REF6141IDGKT has an initial output voltage accuracy of ±0.05% at 25°C and a maximum temperature coefficient of 8 ppm/°C over –40°C to +125°C. This means its output remains within ±0.05% at room temperature and drifts no more than ±0.0008% per °C across the full industrial range - ensuring predictable performance in uncontrolled thermal environments. REF6141IDGKT is specified and tested to meet these limits per TI SBOS747B.
Can REF6141IDGKT directly drive the REF pin of ADS8881 without external components?
Yes, REF6141IDGKT is explicitly verified to drive the REF pin of ADS8881 SAR ADCs directly, with no external buffer required. Its integrated low-output-impedance buffer (<50 mΩ up to 200 kHz) maintains ≤1 LSB droop at 1 MSPS, even during first-sample acquisition with full-scale inputs. REF6141IDGKT achieves this using its OUT_F/OUT_S force-sense architecture and mandatory ≥1 µF CFILT on the FILT pin.
What is the purpose of the SS pin on REF6141IDGKT?
The SS (short-circuit) pin on REF6141IDGKT allows programmable output current limiting by connecting an external resistor. When left open, REF6141IDGKT defaults to a 10.5 mA short-circuit current limit. This feature protects both the device and downstream circuitry during faults while maintaining design flexibility - unlike fixed-limit references. REF6141IDGKT datasheet Section 6 defines resistor values for custom current thresholds.
How does REF6141IDGKT achieve low noise performance?
REF6141IDGKT achieves 5 µVRMS total integrated noise (0.1 Hz–10 kHz) using a combination of low-noise bandgap core design, integrated buffer isolation, and mandatory external filtering: a ≥1 µF capacitor on FILT suppresses internal regulator noise, while ≥22 µF output capacitance (CL) further attenuates broadband noise. Its 3 µVPP/V 1/f noise (0.1–10 Hz) is optimized for DC-coupled precision applications. REF6141IDGKT specifies these values under defined test conditions in Section 7.5.
What are the recommended power supply conditions for REF6141IDGKT?
REF6141IDGKT requires VIN ≥ VOUT + 0.25 V (i.e., ≥4.346 V) and ≤5.5 V, with typical operation at 5 V. Supply current is 0.82–0.90 mA in active mode and 1–3 µA in shutdown. Line regulation is 4–20 ppm/V at 25°C, degrading to 30 ppm/V over temperature. REF6141IDGKT must be decoupled with ≥1 µF at FILT and ≥22 µF at OUT_F per TI layout guidelines to ensure stability and noise performance.
REF6141IDGKT 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):
- 4.096V
- 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:
- 4.35V ~ 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
REF6141IDGKT FAQ
1.How can I place an order for REF6141IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for REF6141IDGKT 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 REF6141IDGKT reliable?
The price and inventory of REF6141IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF6141IDGKT is usually 5 days.
3.What payment methods are accepted for REF6141IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF6141IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF6141IDGKT?
REF6141IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF6141IDGKT 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 REF6141IDGKT?
For technical support, including REF6141IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF6141IDGKT requirements.
6.How does Aetrix verify that REF6141IDGKT is sourced from the original manufacturer or authorized distributors?
All REF6141IDGKT 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 REF6141IDGKT meets industry standards.
7.What is the process for return or replacement of REF6141IDGKT?
All REF6141IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with REF6141IDGKT, 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 REF6141IDGKT part is unused and in its original packaging.
Return procedure for REF6141IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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