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Texas Instruments REF6133IDGKR
- Part No.:
- REF6133IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
REF6133IDGKR.pdf
- Description:
- IC VREF SERIES 0.05% 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,539
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Product details
Overview
REF6133IDGKR from Texas Instruments is a high-precision, 3.3 V voltage reference IC with integrated ADC drive buffer, ±0.05% initial accuracy, 8 ppm/°C max temperature drift (–40°C to +125°C), 5 µVRMS total noise (with 47 µF capacitor), and <50 mΩ output impedance (DC–200 kHz). It directly drives the REF pin of precision SAR ADCs like ADS8881 in burst-mode data acquisition systems.
For engineers reviewing the REF6133IDGKR datasheet, REF6133IDGKR pinout, REF6133IDGKR application, or REF6133IDGKR equivalent, this page delivers verified specifications, functional pin definitions, real-world droop performance vs. ADS8881, buffer-enabled 18-bit first-sample precision, and validated alternatives for test & measurement, PLC analog input, and medical DAQ designs.
Technical Context
The REF6133IDGKR integrates a low-output-impedance buffer optimized for dynamic capacitive loads-specifically the switching REF pin of SAR ADCs such as ADS88xx. Its architecture maintains sub-1 LSB (19.07 µV) droop at 1 MSPS with ADS8881, enabling precise first-conversion accuracy without external buffering.
It operates from a 3.55 V minimum supply (VOUT + 0.25 V), draws only 820 µA quiescent current, and features programmable short-circuit current via the SS pin. The dual-ground (GNDF/GNDS) and force/sense (OUTF/OUTS) topology supports high-accuracy remote sensing in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±0.05% - enables direct interface with 3.3 V ADC reference inputs without scaling or trimming. |
| Temp Drift | 8 ppm/°C max (–40°C to +125°C) - ensures ≤±1 LSB error over full industrial temperature range for 18-bit systems. |
| Noise (0.1–10 Hz) | 3 µVPP/V - contributes negligible error in DC-coupled precision measurements and low-frequency sensor interfaces. |
| Output Impedance | <50 mΩ (DC–200 kHz) - sustains stable REF voltage during fast capacitor-switching events in SAR ADC conversion cycles. |
| Supply Current | 0.82–0.90 mA active, 1–3 µA shutdown - supports low-power portable instrumentation and battery-backed monitoring systems. |
| Load Drive | ±4 mA - sufficient to source/sink transient currents from ADS88xx/ADS127xx REF pins without droop-induced nonlinearity. |
| Droop Performance | <1 LSB at 1 MSPS with ADS8881 - guarantees first-sample precision in event-triggered and burst-mode DAQ applications. |
Pinout & Package
REF6133IDGKR is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm), optimized for space-constrained PCB layouts while maintaining thermal and electrical performance in precision analog signal chains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies internal reference and buffer; requires ≥3.55 V (3.3 V + 0.25 V) for full-spec operation. |
| EN | Enable control | Active-high logic input; pulls device into 1 µA shutdown mode when low, enabling power-gating in multi-channel systems. |
| SS | Short-circuit limit | Resistor-programmable output current limit; open-circuit sets default 10.5 mA short-circuit threshold. |
| FILT | Filter capacitor node | Connects ≥1 µF capacitor to GND for stability; decouples high-frequency noise from internal regulator loop. |
| OUT_S | Voltage sense input | Feedback path for remote sensing; connects to ADC REF pin to compensate for trace IR drop. |
| OUT_F | Voltage force output | Low-impedance buffered output; drives load directly when local sensing is used (OUT_S tied to OUT_F). |
| GND_F | Force ground | Return path for OUT_F; separates high-current return from sensitive sense path to minimize ground bounce. |
| GND_S | Sense ground | Return path for OUT_S and internal reference core; routed near ADC REF ground to preserve common-mode integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ADC drive buffer | Eliminates need for external op-amp buffer, reducing BOM count, layout area, and phase-margin risk in REF-driven SAR systems. |
| 18-bit first-sample precision | Validated with ADS8881 at 1 MSPS: reference droop remains <1 LSB, critical for trigger-on-event and variable-rate sampling. |
| Dual-ground (force/sense) architecture | Enables Kelvin-style remote sensing across PCB traces up to 10 cm, maintaining accuracy despite layout IR drops. |
| Programmable short-circuit current | SS pin resistor sets current limit from ~2 mA to 10.5 mA, allowing safe operation into mismatched or faulted ADC REF pins. |
| Ultra-low 1/f noise | 3 µVPP (0.1–10 Hz) supports high-resolution DC measurements in weigh scales, strain gauges, and medical front-ends. |
Applications
| ATE Testers and Oscilloscopes | Test and Measurement Equipment |
|---|---|
Use Scenario: High-speed automated test equipment capturing transient waveforms at 1+ MSPS using ADS8881-based digitizers. IC Role / Device Role / Timing Role: Supplies ultra-stable 3.3 V reference to ADC REF pin, maintaining linearity and SNR during rapid burst acquisitions. Use Value: Enables first-sample accuracy to 18 bits without post-processing correction, reducing calibration overhead and test time. |
Use Scenario: Portable multimeters and handheld analyzers requiring stable DC reference under varying ambient temperatures. IC Role / Device Role / Timing Role: Precision voltage reference core with integrated buffer, delivering low-drift, low-noise 3.3 V for ratiometric ADC measurements. Use Value: Achieves ≤±1 LSB error over –40°C to +125°C, eliminating need for on-board temperature compensation algorithms. |
| Analog Input Modules for PLCs | Medical Equipment |
Use Scenario: Industrial PLC I/O modules digitizing 4–20 mA or ±10 V sensor signals with 16–18 bit resolution. IC Role / Device Role / Timing Role: Buffered reference source driving multiple SAR ADCs' REF pins in shared backplane architectures. Use Value: Dual-ground topology rejects common-mode noise from motor drives and long field wiring, preserving ENOB. |
Use Scenario: Patient-monitoring devices (ECG, EEG) acquiring low-amplitude bio-signals with high DC fidelity. IC Role / Device Role / Timing Role: Low-noise, low-drift reference for sigma-delta or SAR ADCs in isolated front-end signal chains. Use Value: 3 µVPP (0.1–10 Hz) noise floor prevents obscuring microvolt-level physiological signals during baseline analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF6130IDGKR | 3.0 V output, identical drift (8 ppm/°C), noise, and buffer specs; same package and pinout. | Used where system ADC requires 3.0 V REF (e.g., certain TI ADS12xx or ADI AD76xx families). | Select when matching 3.0 V ADC reference voltage eliminates level-shifting and improves PSRR. |
| REF6233IDGKT | 3.3 V output, lower 3 ppm/°C drift (0°C to 70°C only), higher 1.2 mA supply current, same VSSOP-8 package. | Targeted at commercial-temperature lab instruments where ultra-low drift outweighs power budget constraints. | Choose for metrology-grade benchtop equipment needing tighter drift spec within limited temperature range. |
Compared with REF6133IDGKR, REF6130IDGKR offers identical performance at 3.0 V for compatible ADCs, while REF6233IDGKT trades wider temperature coverage for superior 3 ppm/°C drift in 0°C–70°C environments-making it suitable for calibrated lab gear but not extended industrial use.
Availability
REF6133IDGKR 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, long-term parametric consistency, and guaranteed manufacturability through 2030.
Supply support for REF6133IDGKR 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 designed specifically to solve dynamic REF pin loading in high-resolution SAR and delta-sigma ADCs-enabling first-sample accuracy, simplified layout, and reduced system-level noise in test, industrial, and medical DAQ applications.
FAQ
What is the output voltage tolerance and temperature coefficient of REF6133IDGKR?
The REF6133IDGKR has an initial output voltage tolerance of ±0.05% and a maximum temperature coefficient of 8 ppm/°C over –40°C to +125°C. These values are specified for the combined voltage reference and integrated buffer circuitry, ensuring end-to-end accuracy without external calibration. This performance is validated per the box method defined in TI's SBOS747B datasheet.
Can REF6133IDGKR drive the REF pin of ADS8881 without external buffering?
Yes, REF6133IDGKR 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) maintains <1 LSB droop at 1 MSPS, enabling 18-bit first-sample precision in burst-mode acquisition. This capability is confirmed in TI's typical application circuits and droop characterization plots (Figures 32–34, SBOS747B).
What is the purpose of the separate OUT_F and OUT_S pins on REF6133IDGKR?
The OUT_F (force) and OUT_S (sense) pins implement a Kelvin connection for remote voltage regulation. OUT_F delivers buffered current to the load, while OUT_S provides feedback to the internal amplifier-enabling accurate regulation at the ADC REF pin despite PCB trace resistance. This dual-path design minimizes errors from IR drop, especially critical in multi-board or long-trace industrial signal chains.
How does the SS pin function in REF6133IDGKR?
The SS (short-circuit) pin on REF6133IDGKR allows programmable output current limiting. Connecting a resistor between SS and GND sets the short-circuit current threshold from ~2 mA to 10.5 mA; leaving SS open configures the default 10.5 mA limit. This protects both REF6133IDGKR and connected ADCs during fault conditions or REF pin miswiring, without requiring external current-limiting components.
What are the recommended operating conditions for REF6133IDGKR supply voltage?
REF6133IDGKR requires a minimum supply voltage of VOUT + 0.25 V = 3.55 V under all operating conditions, with an absolute maximum of 5.5 V. At 25°C, VIN must be ≥3.55 V for full specification compliance; at temperature extremes (–40°C to +125°C), headroom requirements remain unchanged. Supply ripple should be ≤10 mVPP to avoid degrading PSRR and noise performance.
REF6133IDGKR 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):
- 3.3V
- 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:
- 3.55V ~ 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
REF6133IDGKR FAQ
1.How can I place an order for REF6133IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF6133IDGKR 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 REF6133IDGKR reliable?
The price and inventory of REF6133IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF6133IDGKR is usually 5 days.
3.What payment methods are accepted for REF6133IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF6133IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF6133IDGKR?
REF6133IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF6133IDGKR 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 REF6133IDGKR?
For technical support, including REF6133IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF6133IDGKR requirements.
6.How does Aetrix verify that REF6133IDGKR is sourced from the original manufacturer or authorized distributors?
All REF6133IDGKR 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 REF6133IDGKR meets industry standards.
7.What is the process for return or replacement of REF6133IDGKR?
All REF6133IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with REF6133IDGKR, 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 REF6133IDGKR part is unused and in its original packaging.
Return procedure for REF6133IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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