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Texas Instruments REF6145IDGKT
- Part No.:
- REF6145IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
REF6145IDGKT.pdf
- Description:
- IC VREF SERIES 0.05% 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,035
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Product details
Overview
REF6145IDGKT from Texas Instruments is a high-precision, 4.5 V voltage reference with integrated ADC drive buffer, designed to directly drive the REF pin of SAR and delta-sigma ADCs such as ADS8881 and ADS127L01. It delivers ±0.05% initial accuracy, 8 ppm/°C max temperature drift (–40°C to +125°C), <50 mΩ output impedance (DC–200 kHz), and supports ±3.5 mA output current - enabling first-sample 18-bit precision in burst-mode data acquisition systems.
For engineers reviewing the REF6145IDGKT datasheet, REF6145IDGKT pinout, REF6145IDGKT application, or REF6145IDGKT equivalent, this page provides verified specifications, validated ADC interface performance with ADS88xx/ADS127xx families, droop-limited timing behavior under dynamic load, and real-world thermal stability metrics for precision analog signal chains.
Technical Context
The REF6145IDGKT integrates a low-drift bandgap core with a high-bandwidth, low-output-impedance buffer optimized for transient REF-pin loading during ADC conversion cycles. Its architecture maintains output stability within 1 LSB (19.07 µV at 1 MSPS with ADS8881) during the first sample, eliminating need for external buffering in high-resolution DAQ systems.
It features programmable short-circuit current via SS pin, dual ground pins (GND_F/GND_S) for force-sense separation, FILT pin for ≥1 µF stabilization capacitor, and EN-controlled shutdown with 1 µA quiescent current - all implemented in an 8-pin VSSOP package with 3.00 mm × 3.00 mm footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.5 V nominal - precisely matches common ADC full-scale reference requirements (e.g., ADS8881 at 18-bit resolution). |
| Initial Accuracy | ±0.05% - ensures ≤1 LSB error at 18-bit (262,144 codes) without calibration. |
| Temp Drift | 8 ppm/°C max (–40°C to +125°C) - guarantees ≤±1 LSB drift over industrial temperature range. |
| Output Impedance | <50 mΩ (DC–200 kHz) - sustains fast settling and minimal droop during ADC capacitor switching transients. |
| Total Noise | 5 µVRMS (with 47 µF CL) - enables >100 dB SNR in precision ADC systems (e.g., 100.5 dB with ADS8881). |
| Supply Current | 0.83–0.95 mA active mode - balances low power with high drive capability for portable and thermally constrained designs. |
| Short-Circuit Limit | Programmable via SS pin; 10.5 mA default - protects against fault conditions while preserving ADC interface integrity. |
Pinout & Package
REF6145IDGKT is housed in an 8-pin VSSOP (DGK) package, 3.00 mm × 3.00 mm body size, with exposed pad for thermal enhancement and standard JEDEC moisture sensitivity level (MSL) 2a handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies reference core and buffer; requires VIN ≥ VOUT + 0.25 V (min 4.75 V for 4.5 V output). |
| EN | Digital enable input | Active-high logic control; pulls device into 1 µA shutdown when low; threshold 1.6 V (active), 0.6 V (shutdown). |
| SS | Short-circuit current limit | Resistor-connected pin sets output current limit; open = 10.5 mA default; connects to VIN for max limit. |
| FILT | Filter capacitor node | Requires ≥1 µF capacitor to GND for internal compensation and stability; decouples high-frequency noise. |
| OUT_S | Sense input | Feedback path for output voltage regulation; connects to external load or ADC REF pin for Kelvin sensing. |
| OUT_F | Force output | Low-impedance buffered output; drives dynamic REF-pin load of SAR/ΔΣ ADCs without droop degradation. |
| GND_F | Force ground | Return path for OUT_F; separates high-current return from sense path to minimize IR drop errors. |
| GND_S | Sense ground | Return path for OUT_S and internal reference core; maintains accurate feedback under varying load currents. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ADC drive buffer | Eliminates need for external op-amp; preserves linearity and noise performance when driving ADS88xx/ADS127xx REF pins. |
| First-sample 18-bit precision | Guarantees ≤1 LSB droop at 1 MSPS with ADS8881 - critical for burst-mode, event-triggered, and variable-rate DAQ. |
| Low 1/f noise | 3 µVPP/V (0.1 Hz–10 Hz) - minimizes low-frequency drift in DC-coupled precision measurement applications. |
| Force-sense output architecture | Separates high-current force path (OUT_F/GND_F) from precision sense path (OUT_S/GND_S) to reject PCB trace resistance errors. |
| Stable with wide capacitive load | Operates reliably with 10–47 µF output capacitance - accommodates typical ADC REF-pin decoupling and layout constraints. |
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 4.5 V reference to ADS8881 SAR ADC REF pin during first-sample acquisition after trigger. Use Value: Enables guaranteed ≤1 LSB droop at startup - eliminates post-trigger settling delay and improves test throughput. |
Use Scenario: Portable multimeters and calibrated data loggers requiring long-term DC voltage accuracy. IC Role / Device Role / Timing Role: Precision voltage reference for ratiometric sensor excitation and ADC conversion in battery-powered instruments. Use Value: 8 ppm/°C drift and 80 ppm long-term stability ensure calibration validity over extended field deployment. |
| Analog Input Modules for PLCs | Medical Equipment |
|
Use Scenario: Industrial I/O modules digitizing 4–20 mA and ±10 V sensor signals across wide ambient temperatures. IC Role / Device Role / Timing Role: Reference source for isolated sigma-delta ADCs (e.g., ADS127L01) in DIN-rail mounted controllers. Use Value: Robust operation from –40°C to +125°C with <50 mΩ output impedance ensures consistent 24-bit linearity in harsh environments. |
Use Scenario: Patient monitoring devices measuring ECG, EEG, or blood oxygen with sub-microvolt resolution. IC Role / Device Role / Timing Role: Low-noise 4.5 V reference for high-SNR front-end ADCs in battery-operated diagnostic tools. Use Value: 5 µVRMS total noise and 100.5 dB SNR with ADS8881 support clinical-grade signal fidelity and FDA-compliant accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF6141IDGKT | 4.096 V output (vs. 4.5 V); identical drift (8 ppm/°C), noise, and buffer specs. | Optimized for 16-bit+ systems using 4.096 V full-scale (e.g., many microcontroller ADCs); not suitable where 4.5 V rail alignment is required. | Select REF6141IDGKT only if system ADC reference range is 4.096 V and no gain scaling is used. |
| REF6245IDGKT | 3 ppm/°C max drift (0°C–70°C only); same 4.5 V output but narrower temp range and higher cost. | Targeted at commercial-grade lab equipment; lacks extended industrial temperature support (–40°C to +125°C). | Choose REF6245IDGKT only when ultra-low drift is mandatory and operating environment stays within 0°C–70°C. |
Compared with REF6145IDGKT, REF6141IDGKT offers matching performance at 4.096 V for legacy 16-bit systems, while REF6245IDGKT trades industrial temperature range for lower drift in controlled environments - making REF6145IDGKT the optimal balance of precision, robustness, and 4.5 V compatibility for industrial DAQ.
Availability
REF6145IDGKT is available at Aetrix Electronics and suitable for precision data acquisition systems, industrial PLC analog input modules, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for REF6145IDGKT 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 REF-pin loading challenges in high-resolution SAR and delta-sigma ADCs - delivering integrated buffering, ultra-low drift, and guaranteed first-sample accuracy for next-generation test, industrial, and medical instrumentation.
FAQ
What is the output voltage tolerance and temperature coefficient of REF6145IDGKT?
The REF6145IDGKT has a nominal output voltage of 4.5 V with ±0.05% initial accuracy and a maximum temperature coefficient of 8 ppm/°C over –40°C to +125°C. This ensures output variation remains within ±1 LSB of an 18-bit system (262,144 codes) across its full industrial operating range, directly supporting uncalibrated high-resolution data acquisition.
Can REF6145IDGKT drive the REF pin of ADS8881 without external components?
Yes - REF6145IDGKT is explicitly verified to drive the REF pin of the ADS8881 SAR ADC without external buffering. Its integrated low-output-impedance buffer (<50 mΩ, DC–200 kHz) and optimized transient response limit reference droop to <1 LSB at 1 MSPS, enabling precise first-sample acquisition in burst-mode systems as confirmed in TI's SBOS747B datasheet.
What is the purpose of the separate OUT_F, OUT_S, GND_F, and GND_S pins on REF6145IDGKT?
REF6145IDGKT uses a force-sense architecture: OUT_F and GND_F deliver high-current output to the load, while OUT_S and GND_S provide Kelvin-sense feedback to the internal regulator. This separation rejects voltage drops across PCB traces and connectors, maintaining output accuracy even under dynamic load conditions - essential for precision ADC reference applications.
How does the FILT pin function, and what capacitor value is required?
The FILT pin on REF6145IDGKT requires a minimum 1 µF capacitor to ground for internal loop compensation and stability. This capacitor reduces high-frequency noise and ensures robust operation with capacitive loads up to 47 µF - accommodating typical ADC REF-pin decoupling networks without oscillation or settling issues.
What is the short-circuit current limit behavior of REF6145IDGKT, and how is it configured?
REF6145IDGKT features a programmable short-circuit current limit set via the SS pin. With SS open, the default limit is 10.5 mA. Connecting a resistor between SS and GND adjusts the limit downward; connecting SS to VIN selects the highest available limit. This protects both the REF6145IDGKT and downstream circuitry during fault conditions while preserving normal operation.
REF6145IDGKT 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):
- 4.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3.5 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 8ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.75V ~ 5.5V
- Current - Supply:
- 1.15mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
REF6145IDGKT FAQ
1.How can I place an order for REF6145IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for REF6145IDGKT 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 REF6145IDGKT reliable?
The price and inventory of REF6145IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF6145IDGKT is usually 5 days.
3.What payment methods are accepted for REF6145IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF6145IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF6145IDGKT?
REF6145IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF6145IDGKT 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 REF6145IDGKT?
For technical support, including REF6145IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF6145IDGKT requirements.
6.How does Aetrix verify that REF6145IDGKT is sourced from the original manufacturer or authorized distributors?
All REF6145IDGKT 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 REF6145IDGKT meets industry standards.
7.What is the process for return or replacement of REF6145IDGKT?
All REF6145IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with REF6145IDGKT, 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 REF6145IDGKT part is unused and in its original packaging.
Return procedure for REF6145IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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