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Texas Instruments OPA2837IRUNR
- Part No.:
- OPA2837IRUNR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-WFQFN
- Datasheet:
-
OPA2837IRUNR.pdf
- Description:
- IC OPAMP VFB 2 CIRCUIT 10WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,456
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Product details
Overview
OPA2837IRUNR from Texas Instruments is a dual-channel, unity-gain stable, voltage-feedback operational amplifier optimized for precision SAR ADC driving and reference buffering. It delivers 105-MHz small-signal bandwidth at 1 V/V gain, 600 µA per channel quiescent current, ±130 µV max input offset voltage (25°C), rail-to-rail output, and negative-rail input - enabling true ground-referenced signal conditioning in low-power 16-bit data acquisition systems such as ADS8860-based designs.
For engineers reviewing the OPA2837IRUNR datasheet, OPA2837IRUNR pinout, OPA2837IRUNR application, or OPA2837IRUNR equivalent, key selection criteria include its 4.7 nV/√Hz input voltage noise at >100 Hz, 35-ns settling time to 0.1% for 0.5-V step, 50-MHz gain-bandwidth product, and dual-channel WQFN-10 package with independent shutdown pins (PD1/PD2) supporting power-scaling in wearable and battery-powered sensor interfaces.
Technical Context
The OPA2837IRUNR employs a voltage-feedback architecture with fully differential input stage and rail-to-rail output stage, enabling operation from 2.7 V to 5.4 V single supply while maintaining negative-rail input capability down to VS–. Its internal trimming achieves ±130 µV max input offset voltage and < ±2.0 µV/°C max drift over –40°C to +125°C in the RUN package.
Designed specifically for SAR ADC driver applications, it provides low dynamic output impedance (< 0.14 Ω at 1 MHz, G = 1) and fast overdrive recovery (75 ns), critical for charging ADC input capacitance without distortion. Channel-to-channel crosstalk is –126 dBc at 10 kHz, confirming isolation suitable for dual-channel simultaneous sampling systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 105 MHz at G = 1 V/V - enables wideband signal conditioning before 1-MSPS SAR ADCs without phase loss |
| Quiescent current per channel | 600 µA at 5 V - supports ultra-low-power operation in battery-powered instrumentation |
| Input offset voltage (max) | ±130 µV at 25°C - ensures < 0.002% gain error in 16-bit precision signal chains |
| Input voltage noise | 4.7 nV/√Hz (>100 Hz) - preserves SNR in high-resolution sensor front-ends |
| Settling time to 0.1% | 35 ns for 0.5-V step - meets timing budget of fast 1-MSPS SAR converters like ADS8860 |
| Gain-bandwidth product | 50 MHz - guarantees stable unity-gain operation and low output impedance up to 10 MHz |
| Channel crosstalk | –126 dBc at 10 kHz - prevents inter-channel interference in dual-sensor or I/Q signal paths |
Pinout & Package
The OPA2837IRUNR is housed in a 10-pin WQFN package (2.0 mm × 2.0 mm, 0.5-mm pitch) with wettable flanks, optimized for thermal performance (RθJA = 124.9°C/W) and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1– | Amplifier 1 inverting input | Differential input node for first op amp channel; accepts signals down to VS– rail |
| VIN1+ | Amplifier 1 noninverting input | Differential input node for first op amp channel; common-mode range extends to VS+ – 1.2 V |
| VOUT1 | Amplifier 1 output | Rail-to-rail output capable of sourcing/sinking ±45 mA linearly into resistive loads |
| VS+ | Positive power supply | Single-supply input (2.7–5.4 V); powers both amplifiers and internal bias circuitry |
| VS– | Negative power supply / ground | Reference node for single-supply operation; supports true ground-referenced inputs |
| VIN2– | Amplifier 2 inverting input | Independent differential input for second channel; electrically isolated from Channel 1 |
| VIN2+ | Amplifier 2 noninverting input | Independent differential input for second channel; matched DC specs to Channel 1 |
| VOUT2 | Amplifier 2 output | Second rail-to-rail output; crosstalk < –126 dBc ensures signal integrity in dual-channel use |
| PD1 | Channel 1 power-down control | Logic input: high = active, low = shutdown (5-µA quiescent per channel) |
| PD2 | Channel 2 power-down control | Independent shutdown for Channel 2; enables dynamic power management in multi-signal systems |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable voltage feedback | Guarantees stability without external compensation in G = 1 configurations - essential for ADC driver buffer stages |
| True ground-input capability | Common-mode input range includes VS– (0 V in single-supply), enabling direct connection to ground-referenced sensors |
| Independent per-channel shutdown | PD1 and PD2 pins allow selective disabling of either amplifier - reduces system power by >99% per idle channel |
| Low 1/f noise corner | 35-Hz voltage noise corner frequency - preserves accuracy in DC-coupled, low-frequency sensor signal paths |
| High PSRR | +PSRR = 95 dB, –PSRR = 92 dB - rejects supply ripple in noisy embedded environments without additional filtering |
Applications
| 12-Bit to 16-Bit SAR ADC Driver | Precision ADC Reference Buffer |
|---|---|
Use Scenario: Driving the analog input of a 16-bit, 1-MSPS SAR ADC (e.g., ADS8860) with single-ended, ground-referenced sensor signals. IC Role / Device Role / Timing Role: Precision gain-stage amplifier providing fast settling, low noise, and low output impedance to charge ADC input capacitance within conversion window. Use Value: 35-ns 0.1% settling time and 4.7-nV/√Hz noise ensure full 16-bit ENOB is maintained at 1 MSPS without aperture jitter or thermal tailing. | Use Scenario: Buffering a precision voltage reference (e.g., REF5040) to supply stable bias to multiple ADCs or DACs in a data acquisition module. IC Role / Device Role / Timing Role: Low-drift, low-noise unity-gain follower isolating reference source from load variations and PCB trace impedance. Use Value: ±130-µV max offset and < ±2.0 µV/°C drift preserve reference accuracy across –40°C to +125°C industrial temperature range. |
| Low-Power Transimpedance Amplifier | Wearable Device Front-End |
Use Scenario: Converting photodiode current to voltage in portable optical sensing, using low supply voltage and minimal power. IC Role / Device Role / Timing Role: High-speed, low-noise transimpedance amplifier with rail-to-rail output swing and shutdown control for duty-cycled operation. Use Value: 600-µA per channel quiescent current and 5-µA shutdown mode extend battery life; 105-MHz bandwidth supports fast pulse detection. | Use Scenario: Signal conditioning for ECG, PPG, or inertial sensors in compact, battery-powered wearables requiring long runtime and small form factor. IC Role / Device Role / Timing Role: Dual-channel analog front-end amplifier handling two independent biosignals with independent power gating. Use Value: 2.0 mm × 2.0 mm WQFN package saves board area; dual PD pins enable adaptive channel activation synchronized with sensor sampling schedule. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2836IRUGR | Same dual-channel architecture but in 16-pin QFN; higher 1.2-mA per channel supply current; no shutdown pins | Lacks independent power-down control; better suited for always-on, higher-performance systems where power is not constrained | Select OPA2836IRUGR only if higher bandwidth (130 MHz) and drive strength are required and shutdown functionality is unnecessary |
| ADA4807-2ARMZ | Lower 1-mA per channel supply current; 180-MHz bandwidth; no rail-to-rail input; input common-mode limited to VS– + 0.1 V | Cannot accept true ground-referenced inputs; requires level-shifting for single-ended sensor interfaces | Choose ADA4807-2ARMZ when maximum speed is critical and input signal range allows positive-only common-mode operation |
Compared with OPA2837IRUNR, OPA2836IRUGR trades shutdown flexibility for higher speed and output drive, while ADA4807-2ARMZ offers greater bandwidth but sacrifices ground-input capability - making OPA2837IRUNR uniquely suited for low-power, ground-referenced SAR ADC driver applications in space- and energy-constrained designs.
Availability
OPA2837IRUNR is available at Aetrix Electronics and suitable for 16-bit SAR ADC drivers, precision reference buffers, and wearable sensor front-ends requiring stable component supply, extended temperature support (–40°C to +125°C), and consistent WQFN-10 packaging.
Supply support for OPA2837IRUNR 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The OPAx837 family was designed to address the growing need for ultra-low-power, high-precision op amps in battery-operated, high-resolution data acquisition systems - particularly SAR ADC driver and reference buffer roles in medical, industrial, and portable instrumentation.
FAQ
What is the maximum operating supply voltage for OPA2837IRUNR?
The OPA2837IRUNR supports a single-supply operating range of 2.7 V to 5.4 V. Absolute maximum ratings specify VS+ to VS– must not exceed 5.5 V. Operation beyond 5.4 V risks parametric degradation or permanent damage, and the device is characterized only up to 5.4 V under recommended conditions. For 5-V systems, OPA2837IRUNR delivers optimal AC performance including 105-MHz bandwidth and 600-µA quiescent current per channel.
Does OPA2837IRUNR support true ground-referenced input signals?
Yes, OPA2837IRUNR supports true ground-referenced input signals. Its input common-mode range extends to VS– (0 V in single-supply configuration), allowing VIN– and VIN+ to operate at 0 V. This is confirmed in the Electrical Characteristics tables: common-mode input range low is specified as –0.2 V to 0 V at 25°C, meaning the device accepts inputs at or slightly below ground. This capability makes OPA2837IRUNR ideal for interfacing with ground-referenced sensors and single-ended sources in systems like ADS8860-based data loggers.
What is the function of the PD1 and PD2 pins on OPA2837IRUNR?
The PD1 and PD2 pins on OPA2837IRUNR provide independent power-down control for each amplifier channel. When driven high (≥ VS– + 1.5 V), the respective channel operates normally; when pulled low (≤ VS– + 0.55 V), it enters shutdown mode with quiescent current reduced to ≤ 8 µA per channel over temperature. This feature enables dynamic power scaling - for example, disabling Channel 2 during single-channel acquisition cycles in a dual-sensor wearable device. The OPA2837IRUNR datasheet specifies turn-on delay of 300 ns and turn-off delay of 100 ns, ensuring rapid state transitions without disrupting timing-critical signal paths.
How does OPA2837IRUNR perform as a reference buffer for REF5040?
OPA2837IRUNR performs exceptionally as a reference buffer for REF5040 due to its low input offset voltage (±130 µV max), low drift (< ±2.0 µV/°C), and rail-to-rail output swing. In unity-gain follower configuration, it maintains REF5040's 4.096-V output accuracy across load variations and temperature. Its 0.14-Ω closed-loop output impedance at 1 MHz ensures minimal droop during transient current demands from multiple downstream ADCs. Combined with 4.7-nV/√Hz input voltage noise, OPA2837IRUNR preserves the REF5040's 16-bit precision without introducing measurable noise or offset error in the signal chain.
Is OPA2837IRUNR pin-compatible with other OPA2837 package variants?
No, OPA2837IRUNR is not pin-compatible with other OPA2837 package variants. The RUN (WQFN-10) package has 10 pins arranged in a 2×5 layout with PD1 and PD2 on pins 4 and 6 respectively, whereas the DGK (VSSOP-8) variant has only 8 pins and no dedicated shutdown pins. Pin functions differ: for example, VOUT1 is pin 1 in RUN but pin 1 in DGK; VS+ is pin 10 in RUN but pin 8 in DGK. Engineers must consult the Pin Configuration and Functions section of the SBOS673D datasheet to confirm routing - migration between packages requires PCB redesign and layout validation.
OPA2837IRUNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 105V/µs
- Gain Bandwidth Product:
- 50 MHz
- -3db Bandwidth:
- 105 MHz
- Current - Input Bias:
- 340 nA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 592µA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.4 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WQFN (2x2)
OPA2837IRUNR FAQ
1.How can I place an order for OPA2837IRUNR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2837IRUNR 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 OPA2837IRUNR reliable?
The price and inventory of OPA2837IRUNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2837IRUNR is usually 5 days.
3.What payment methods are accepted for OPA2837IRUNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2837IRUNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2837IRUNR?
OPA2837IRUNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2837IRUNR 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 OPA2837IRUNR?
For technical support, including OPA2837IRUNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2837IRUNR requirements.
6.How does Aetrix verify that OPA2837IRUNR is sourced from the original manufacturer or authorized distributors?
All OPA2837IRUNR 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 OPA2837IRUNR meets industry standards.
7.What is the process for return or replacement of OPA2837IRUNR?
All OPA2837IRUNR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2837IRUNR, 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 OPA2837IRUNR part is unused and in its original packaging.
Return procedure for OPA2837IRUNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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