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Texas Instruments OPA838IDBVR
- Part No.:
- OPA838IDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA838IDBVR.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,426
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Product details
Overview
OPA838IDBVR from Texas Instruments is a decompensated voltage-feedback operational amplifier optimized for low-noise, high-gain signal conditioning in photodiode transimpedance and precision ADC driver applications. It delivers 300MHz gain-bandwidth product, 1.8nV/√Hz input voltage noise, and 950µA quiescent current at 5V supply - enabling stable 6V/V operation with 90MHz –3dB bandwidth and rail-to-rail output swing.
For engineers reviewing the OPA838IDBVR datasheet, OPA838IDBVR pinout, OPA838IDBVR application, or OPA838IDBVR equivalent, this page provides verified technical context, package-specific pin functions, real-world application constraints (e.g., minimum gain ≥6V/V), and validated alternative options for low-power, high-precision analog front-ends.
Technical Context
The OPA838IDBVR uses a decompensated architecture requiring minimum noninverting gain of 6V/V to ensure stability, yielding 90MHz small-signal bandwidth at 5V supply. Its negative-rail input stage supports single-supply operation from 2.7V to 5.4V with common-mode range extending to VS– – 0.2V.
Internal power-down control (PD pin) enables <1µA shutdown current, while rail-to-rail output delivers ±1.53V swing into 41.3Ω at 5V. Input offset voltage is trimmed to ±125µV max at 25°C, with drift limited to ±1.6µV/°C over –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 300MHz - enables stable 1000V/V DC-coupled gain with 300kHz signal bandwidth |
| Input voltage noise | 1.8nV/√Hz (>200Hz) - critical for low-noise photodiode and sensor preamplifier designs |
| Quiescent current | 950µA (typical) - supports ultra-low-power battery-operated instrumentation |
| Small-signal bandwidth | 90MHz at AV = 6V/V - defines usable closed-loop bandwidth for high-speed filtering |
| Input common-mode range | VS– – 0.2V to VS+ – 1.3V - allows direct interfacing to ground-referenced sensors |
| Output swing | Rail-to-rail - delivers full dynamic range into high-impedance loads without headroom loss |
| Power-down current | 0.1µA to 1µA - enables microamp-level sleep mode in portable systems |
Pinout & Package
The OPA838IDBVR is packaged in a 6-pin SOT-23 (DBV) with 2.9mm × 2.8mm footprint and thermal pad exposed on bottom. Pin 1 is VOUT; pin 2 is VS–; pin 3 is VIN+; pin 4 is VIN–; pin 5 is PD (power-down control); pin 6 is VS+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Amplifier output | Delivers rail-to-rail voltage swing; requires 2kΩ minimum load for specified distortion performance |
| VS– (Pin 2) | Negative supply | Ground reference for single-supply operation; common-mode input extends to VS– – 0.2V |
| VIN+ (Pin 3) | Noninverting input | High-impedance node (35MΩ || 1pF); used for unity-gain stable configurations only when compensated externally |
| VIN– (Pin 4) | Inverting input | Differential input node; connects to feedback network in transimpedance or inverting amplifier topologies |
| PD (Pin 5) | Power-down enable | Logic-controlled shutdown: high ≥VS– + 1.5V enables operation; low ≤VS– + 0.55V reduces IQ to <1µA |
| VS+ (Pin 6) | Positive supply | Accepts 2.7V–5.4V; PSRR >98dB ensures immunity to supply ripple in mixed-signal systems |
Key Features
| Feature | Design Value |
|---|---|
| Trimmed 950µA supply current | Enables continuous operation in energy-constrained systems without thermal derating |
| 1.8nV/√Hz input voltage noise | Minimizes total input-referred noise in high-gain photodiode amplifiers with 100pF capacitance |
| Negative-rail input + rail-to-rail output | Supports true single-supply signal chain design from sensor to ADC without level-shifting circuitry |
| Stable at AV ≥ 6V/V | Eliminates need for external compensation in most high-gain active filter and ADC driver applications |
| Sub-1µA shutdown current | Reduces system standby power by >99.9% versus active mode, critical for duty-cycled sensing |
Applications
| Low-Power Transimpedance Amplifier | 12-bit to 16-bit SAR ADC Driver |
|---|---|
Use Scenario: Amplifying weak current signals from photodiodes or pyroelectric sensors with 100pF junction capacitance under 3V supply. IC Role / Device Role / Timing Role: Primary transimpedance gain stage operating at 1MHz SSBW with <1.1pA/√Hz total input-referred current noise. Use Value: Enables sub-picoamp resolution in portable gas analyzers and pulse oximeters without cooling or external biasing. | Use Scenario: Driving the input of 16-bit SAR ADCs such as ADS8860 with 4VPP full-scale range and 1MSPS sampling rate. IC Role / Device Role / Timing Role: High-fidelity buffer providing 90MHz bandwidth, –110dBc HD2/HD3 at 100kHz, and ±125mV max output offset at G=1000. Use Value: Preserves ENOB >14.5 bits by minimizing settling error and harmonic distortion during acquisition window. |
| Ultrasonic Flow Meter Front-End | High-Gain Active Filter Design |
Use Scenario: Conditioning echo signals from 1MHz ultrasonic transducers in battery-powered water meters with 2.7V–5.4V supply range. IC Role / Device Role / Timing Role: First-stage amplifier with 45MHz large-signal bandwidth and 350V/µs slew rate for fast transient response. Use Value: Resolves time-of-flight differences <1ns, enabling ±0.5% flow accuracy without external gain staging. | Use Scenario: Implementing 4th-order Butterworth anti-aliasing filters with 100kHz cutoff and >60dB stopband attenuation. IC Role / Device Role / Timing Role: Dual-stage high-Q filter section using decompensated topology with precise pole placement via external RC networks. Use Value: Achieves passband flatness <0.1dB and phase linearity within ±2° up to 80kHz, critical for audio and vibration sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA836IDBVR | 110MHz GBP, 4.8nV/√Hz input noise, 1mA IQ, stable at AV ≥ 5V/V | Higher noise limits use in sub-10pA photodiode apps; better suited for general-purpose 100MHz signal chains | Select when lower cost and wider gain stability margin outweigh noise and bandwidth requirements |
| OPA835IDBVR | 30MHz GBP, 9.3nV/√Hz input noise, 0.35mA IQ, stable at AV ≥ 1V/V | Unity-gain stable but insufficient bandwidth for >100kHz ADC drivers or ultrasonic receivers | Choose for battery-powered sensor interfaces where power is more critical than speed or noise |
Compared with OPA836IDBVR and OPA835IDBVR, the OPA838IDBVR uniquely balances 300MHz bandwidth, 1.8nV/√Hz noise, and 950µA IQ - making it the only option among the three suitable for 1MHz transimpedance amplifiers with 100pF capacitance and 16-bit ADC driving at 1MSPS.
Availability
OPA838IDBVR is available at Aetrix Electronics and suitable for low-power transimpedance amplifiers, 16-bit SAR ADC drivers, ultrasonic flow meter front-ends, and high-gain active filter designs requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for OPA838IDBVR 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPA838IDBVR belongs to TI's high-speed, low-noise op amp portfolio designed specifically for precision analog front-ends in photodiode-based sensing, high-resolution data acquisition, and ultrasonic signal conditioning.
FAQ
What is the minimum stable gain for OPA838IDBVR?
The OPA838IDBVR is decompensated and requires a minimum noninverting gain of 6V/V for stable operation. At this gain, it achieves 90MHz –3dB bandwidth with <4dB peaking. Using lower gains without external compensation risks oscillation due to phase margin reduction below 45°.
Does OPA838IDBVR support single-supply operation?
Yes, OPA838IDBVR supports true single-supply operation from 2.7V to 5.4V. Its negative-rail input allows common-mode voltage down to VS– – 0.2V, and rail-to-rail output delivers full swing from VS– to VS+, enabling direct interface with ground-referenced sensors and ADCs without level-shifting circuitry.
What is the input voltage noise specification for OPA838IDBVR?
The OPA838IDBVR has an input voltage noise of 1.8nV/√Hz above 200Hz, with a 1/f corner at 100Hz. This ultra-low noise enables high-gain, low-current signal conditioning - for example, achieving <1.1pA/√Hz total input-referred current noise in photodiode transimpedance amplifiers with 100pF capacitance.
How does the power-down feature work on OPA838IDBVR?
The PD pin (Pin 5) controls power-down mode: driving it high (≥VS– + 1.5V) enables normal operation; pulling it low (≤VS– + 0.55V) reduces quiescent current to 0.1µA–1µA. Turn-on delay is 1.7µs; turn-off delay is 100ns. The pin must be actively driven - floating is undefined.
Can OPA838IDBVR drive a 2kΩ load at full bandwidth?
Yes, OPA838IDBVR is characterized with RL = 2kΩ for all AC specifications including 90MHz bandwidth and –110dBc harmonic distortion at 100kHz. Its closed-loop output impedance is 0.3Ω at 1MHz, ensuring minimal gain error and phase shift when driving standard test loads and typical ADC input impedances.
OPA838IDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 350V/µs
- Gain Bandwidth Product:
- 300 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1.5 µA
- Voltage - Input Offset:
- 15 µV
- Current - Supply:
- 960µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.4 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
OPA838IDBVR FAQ
1.How can I place an order for OPA838IDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA838IDBVR 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 OPA838IDBVR reliable?
The price and inventory of OPA838IDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA838IDBVR is usually 5 days.
3.What payment methods are accepted for OPA838IDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA838IDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA838IDBVR?
OPA838IDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA838IDBVR 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 OPA838IDBVR?
For technical support, including OPA838IDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA838IDBVR requirements.
6.How does Aetrix verify that OPA838IDBVR is sourced from the original manufacturer or authorized distributors?
All OPA838IDBVR 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 OPA838IDBVR meets industry standards.
7.What is the process for return or replacement of OPA838IDBVR?
All OPA838IDBVR units undergo pre-shipment inspection (PSI). If there is an issue with OPA838IDBVR, 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 OPA838IDBVR part is unused and in its original packaging.
Return procedure for OPA838IDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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