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Texas Instruments OPA2837IRUNT
- Part No.:
- OPA2837IRUNT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-WFQFN
- Datasheet:
-
OPA2837IRUNT.pdf
- Description:
- IC OPAMP VFB 2 CIRCUIT 10WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:326
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Product details
Overview
OPA2837IRUNT 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 OPA2837IRUNT datasheet, OPA2837IRUNT pinout, OPA2837IRUNT application, or OPA2837IRUNT 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 fast 300 ns turn-on / 100 ns turn-off recovery from shutdown - all critical for high-resolution, low-power analog front-ends.
Technical Context
The OPA2837IRUNT employs a voltage-feedback architecture with fully differential input stage and rail-to-rail output stage, supporting single-supply operation from 2.7 V to 5.4 V. Its trimmed input offset voltage (±130 µV max) and ultra-low drift (< ±2.0 µV/°C over –40°C to +125°C in WQFN package) enable precision DC-coupled signal paths without trimming.
Designed specifically for SAR ADC driver applications, it features low dynamic output impedance (0.14 Ω at 1 MHz, G = 1), high channel isolation (–126 dBc crosstalk at 10 kHz), and fast overdrive recovery (75 ns at 2× overdrive), ensuring minimal acquisition-time penalty and accurate sampling of fast-settling inputs like REF5040-buffered references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 105 MHz at G = 1 V/V - enables stable closed-loop response up to ~70 MHz for anti-alias filtering before 1 MSPS SAR ADCs. |
| Quiescent current per channel | 600 µA at 5 V - supports battery-powered wearable and portable instrumentation with dual-channel signal conditioning. |
| Input offset voltage (max) | ±130 µV at 25°C - ensures < 0.002% gain error in 16-bit (±4.096 V full-scale) systems using ADS8860. |
| Input voltage noise | 4.7 nV/√Hz (>100 Hz) - contributes < 0.5 LSB RMS noise in 16-bit, 100-kHz bandwidth systems. |
| Settling time to 0.1% | 35 ns for 0.5-V step - meets timing budget for 1 MSPS sampling with >100 ns acquisition window. |
| Shutdown current | 5 µA total (dual-channel) - reduces system standby power in intermittent-sampling architectures. |
| Gain-bandwidth product | 50 MHz - provides sufficient loop gain margin for stable G ≥ 2 configurations with low output impedance. |
Pinout & Package
The OPA2837IRUNT is housed in a 10-pin WQFN package (RUN) with 2.0 mm × 2.0 mm body size and 0.5-mm pitch, optimized for thermal performance (RθJA = 124.9°C/W) and PCB space efficiency in compact sensor nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1− | Inverting input, Channel 1 | Differential input node for first op amp; accepts signals down to VS− (0 V) in single-supply mode. |
| VIN1+ | Noninverting input, Channel 1 | High-impedance input (180 kΩ || 0.5 pF) for precision signal routing; common-mode range extends to 0 V. |
| VOUT1 | Output, Channel 1 | Rail-to-rail output capable of sourcing/sinking ±45 mA linearly; drives ADC input capacitance directly. |
| VIN2− | Inverting input, Channel 2 | Independent second channel input; matched offset and noise performance to Channel 1. |
| VIN2+ | Noninverting input, Channel 2 | Enables dual-path signal conditioning (e.g., differential input buffer + reference buffer) on one die. |
| VOUT2 | Output, Channel 2 | Isolated output with –126 dBc crosstalk - prevents coupling between signal and reference paths. |
| VS+ | Positive supply | Accepts 2.7 V to 5.4 V; PSRR > 95 dB minimizes supply ripple injection into analog signal path. |
| VS− | Negative supply / Ground | Reference for both inputs and outputs; supports true ground-referenced input and output swing. |
| PD1 | Power-down control, Channel 1 | Logic-level input (enable > 1.5 V, disable < 0.55 V); allows independent shutdown of Channel 1 to save power. |
| PD2 | Power-down control, Channel 2 | Independent control enables asymmetric power management - e.g., keep reference buffer active while disabling signal path. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power precision | 600 µA/channel quiescent current with ±130 µV max input offset - achieves 16-bit accuracy without calibration in portable systems. |
| True ground-input capability | Negative-rail input extends common-mode range to VS− (0 V) - eliminates need for level-shifting in single-ended sensor interfaces. |
| Fast shutdown recovery | 300 ns turn-on / 100 ns turn-off - enables dynamic power gating synchronized to ADC conversion cycles. |
| Low-noise SAR driver | 4.7 nV/√Hz input voltage noise + 50 MHz GBW - supplies fast charging current to ADC input capacitors with minimal settling error. |
| High channel isolation | –126 dBc crosstalk at 10 kHz - preserves signal integrity when sharing supply and layout between signal and reference amplifiers. |
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 sensor output referenced to ground. IC Role / Device Role / Timing Role: Signal-conditioning amplifier providing gain, filtering, and drive strength; settles within 35 ns to meet 1-MSPS acquisition timing. Use Value: Eliminates external RC filter and discrete buffer stages, reducing BOM count and board area while maintaining < 0.5 LSB noise floor. | Use Scenario: Buffering a precision voltage reference (e.g., REF5040) to supply clean, low-impedance bias to multiple ADCs or DACs. IC Role / Device Role / Timing Role: Low-noise, high-PSRR reference follower with rail-to-rail output swing to maximize reference utilization. Use Value: Maintains < ±10 µV output deviation under load transients, preserving 16-bit linearity across temperature and supply variation. |
| Low-Power Active Filter | Wearable Sensor Signal Chain |
Use Scenario: Implementing a 2nd-order Sallen-Key low-pass filter in battery-powered medical monitoring equipment. IC Role / Device Role / Timing Role: Dual-channel op amp used as unity-gain buffer and filter integrator; one channel filters, the other buffers reference. Use Value: Achieves < –60 dB stopband attenuation at 100 kHz with only 1.2 mW total quiescent power - extends wearable device runtime. | Use Scenario: Conditioning ECG or PPG sensor outputs in compact, coin-cell–powered wearables requiring 16-bit resolution. IC Role / Device Role / Timing Role: Dual-channel front-end: Channel 1 amplifies sensor signal; Channel 2 buffers reference or provides PGA gain switching. Use Value: Enables simultaneous signal and reference processing in 4 mm² WQFN footprint, meeting stringent size and power constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2836IRUNT | Lower 50 MHz bandwidth, 400 µA/ch quiescent current, no shutdown pins - lacks PD1/PD2 functionality and 105 MHz speed. | Suitable for lower-speed (< 500 kSPS) SAR drivers where power is more critical than bandwidth. | Select OPA2836IRUNT only if 105 MHz bandwidth and independent shutdown are unnecessary; not drop-in compatible due to missing PD pins. |
| ADA4807-2ARMZ | Higher 180 MHz bandwidth but 1.3 mA/ch supply current; ±125 µV max offset; no integrated shutdown control. | Better for high-speed, AC-coupled applications where power is secondary to slew rate (225 V/µs). | Choose ADA4807-2ARMZ when >100 MHz bandwidth and faster slew are required, accepting 2.2× higher power and no shutdown capability. |
Compared with OPA2837IRUNT, OPA2836IRUNT trades bandwidth and shutdown flexibility for lower power, while ADA4807-2ARMZ offers higher speed and slew at significantly increased quiescent current - making OPA2837IRUNT optimal for power-constrained, precision 1-MSPS data acquisition where both speed and shutdown control matter.
Availability
OPA2837IRUNT is available at Aetrix Electronics and suitable for 16-bit SAR ADC driver, precision reference buffering, and low-power active filter applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for OPA2837IRUNT 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 demand for low-power, high-accuracy signal conditioning in portable and battery-operated 12–16-bit data acquisition systems - balancing bandwidth, noise, offset, and quiescent current in a single platform.
FAQ
What is the maximum operating supply voltage for OPA2837IRUNT?
The OPA2837IRUNT supports a recommended single-supply operating range of 2.7 V to 5.4 V. Absolute maximum supply voltage (VS+ to VS−) is 5.5 V. Exceeding 5.4 V may degrade long-term reliability or cause parametric shift outside guaranteed specifications, especially at elevated temperatures.
Does OPA2837IRUNT support true ground-referenced input signals?
Yes, OPA2837IRUNT features negative-rail input capability, allowing the common-mode input range to extend down to VS− (0 V in single-supply configurations). This enables direct interfacing with ground-referenced sensors and eliminates the need for level-shifting circuitry in applications like single-ended ECG front-ends.
How does the power-down feature work on OPA2837IRUNT?
OPA2837IRUNT has two independent power-down pins: PD1 controls Channel 1 and PD2 controls Channel 2. Driving either pin below 0.55 V disables its respective amplifier (quiescent current drops to ≤5 µA), while driving above 1.5 V enables normal operation. Turn-on delay is 300 ns; turn-off delay is 100 ns - enabling cycle-synchronized power gating.
What is the typical input voltage noise of OPA2837IRUNT and at what frequency is it specified?
The OPA2837IRUNT has a typical input voltage noise of 4.7 nV/√Hz at frequencies above 100 Hz. This value is measured and specified in the Electrical Characteristics tables for both 3-V and 5-V supplies, and remains stable across the 100 Hz–10 MHz band - critical for preserving SNR in 16-bit, wideband sensor signal chains.
Can OPA2837IRUNT drive the input capacitance of a 16-bit SAR ADC like the ADS8860 without external isolation?
Yes, OPA2837IRUNT is explicitly characterized for SAR ADC driver applications and delivers low dynamic output impedance (0.14 Ω at 1 MHz, G = 1), enabling direct connection to ADS8860's input capacitance. Its 35 ns 0.1% settling time for a 0.5-V step ensures full settling within the ADC's acquisition window at 1 MSPS, eliminating the need for series isolation resistors.
OPA2837IRUNT 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)
OPA2837IRUNT FAQ
1.How can I place an order for OPA2837IRUNT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2837IRUNT 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 OPA2837IRUNT reliable?
The price and inventory of OPA2837IRUNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2837IRUNT is usually 5 days.
3.What payment methods are accepted for OPA2837IRUNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2837IRUNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2837IRUNT?
OPA2837IRUNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2837IRUNT 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 OPA2837IRUNT?
For technical support, including OPA2837IRUNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2837IRUNT requirements.
6.How does Aetrix verify that OPA2837IRUNT is sourced from the original manufacturer or authorized distributors?
All OPA2837IRUNT 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 OPA2837IRUNT meets industry standards.
7.What is the process for return or replacement of OPA2837IRUNT?
All OPA2837IRUNT units undergo pre-shipment inspection (PSI). If there is an issue with OPA2837IRUNT, 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 OPA2837IRUNT part is unused and in its original packaging.
Return procedure for OPA2837IRUNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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