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Texas Instruments OPA838IDBVT
- Part No.:
- OPA838IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA838IDBVT.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,076
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Product details
Overview
OPA838IDBVT 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, 950µA quiescent current, and rail-to-rail output with negative-rail input - enabling stable 6V/V operation at 90MHz bandwidth on 3V–5.4V single supply.
For engineers reviewing the OPA838IDBVT datasheet, OPA838IDBVT pinout, OPA838IDBVT application, or OPA838IDBVT equivalent, key selection criteria include its ultra-low input noise at high gain, power-down capability (<1µA), DC-coupled 300kHz bandwidth at 1000V/V, and validated performance in SAR ADC driver and ultrasonic flow meter front-ends.
Technical Context
The OPA838IDBVT employs a decompensated architecture requiring minimum noninverting gain of 6V/V for stability, yielding 90MHz –3dB bandwidth and 45MHz large-signal (4VPP) bandwidth. Its input stage features PNP-based negative-rail input with matched differential pair, enabling common-mode range down to VS– and CMRR ≥95dB.
Power-down functionality is implemented via dedicated PD pin (pin 5 in DBV package), with enable threshold >VS–+1.5V and shutdown current ≤1µA. Input offset voltage is trimmed to ±125µV max at 25°C, with drift <±1.6µV/°C over –40°C to +125°C - supporting precision DC-coupled amplification without external nulling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 300MHz - enables stable 6V/V gain with 90MHz bandwidth; supports high closed-loop gain without sacrificing speed. |
| Input voltage noise | 1.8nV/√Hz (>200Hz) - critical for low-noise transimpedance amplifiers and high-gain sensor interfaces. |
| Supply current | 950µA (typical) - allows battery-powered or energy-constrained designs while maintaining RF-grade bandwidth. |
| Input common-mode range | VS– to (VS+ – 1.3V) - supports single-supply operation with ground-referenced inputs and rail-to-rail output swing. |
| Small-signal bandwidth | 90MHz at G = 6V/V - verified under 20mVPP, <4dB peaking condition per datasheet test setup. |
| Power-down current | ≤1µA - reduces system standby power in portable or duty-cycled instrumentation. |
| Input offset voltage | ±125µV (max at 25°C) - ensures minimal DC error in precision gain stages without trimming circuitry. |
Pinout & Package
The OPA838IDBVT is packaged in a 6-pin SOT-23 (DBV) with 2.9mm × 2.8mm footprint and thermal pad exposed on bottom. Pin 1 = VOUT, Pin 2 = VS–, Pin 3 = VIN+, Pin 4 = VIN–, Pin 5 = PD (power-down control), Pin 6 = VS+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Amplifier output | Rail-to-rail capable; drives 2kΩ load with <0.1% settling in 30ns at G=6. |
| VS– (Pin 2) | Negative supply | Reference for input common-mode range down to VS–; must be connected to ground or negative rail. |
| VIN+ (Pin 3) | Noninverting input | Differential input node; high-impedance (30kΩ || 1.3pF) with CMRR ≥95dB. |
| VIN– (Pin 4) | Inverting input | Feedback node; matched to VIN+ for precision closed-loop gain accuracy. |
| PD (Pin 5) | Power-down enable | Active-high digital control: logic high (>VS–+1.5V) enables operation; low disables amplifier. |
| VS+ (Pin 6) | Positive supply | Accepts 2.7V–5.4V single supply; PSRR ≥98dB ensures immunity to supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage noise | 1.8nV/√Hz enables sub-picoamp current measurement in photodiode TIA designs with 100kΩ feedback. |
| Trimmed input offset voltage | ±125µV max at 25°C supports DC-coupled gains up to 1000V/V with ≤±125mV output offset. |
| Single-supply rail-to-rail output | Swings within 100mV of rails at 25°C, simplifying level-shifting in 3V systems interfacing to SAR ADCs. |
| Integrated power-down mode | Reduces quiescent current to <1µA; turn-on delay <3.5µs - suitable for burst-mode sensing applications. |
| Negative-rail input stage | Allows input signals referenced to ground in single-supply configurations, eliminating level-shifters in sensor front-ends. |
Applications
| Low-Power Transimpedance Amplifier | 12–16-Bit SAR ADC Driver |
|---|---|
Use Scenario: Photodiode current amplification in portable gas analyzers or pulse oximeters with <100pF detector capacitance and battery operation. IC Role / Device Role / Timing Role: Primary transimpedance gain stage converting pA-level photocurrent to voltage with minimal added noise and offset. Use Value: 1.8nV/√Hz input noise and 950µA supply current achieve <1.1pA/√Hz total input-referred current noise at 100kΩ gain - preserving SNR in low-light conditions. | Use Scenario: Driving the analog input of 12–16-bit successive-approximation ADCs in industrial data acquisition modules operating from 3V supplies. IC Role / Device Role / Timing Role: High-fidelity buffer and gain stage ensuring full-scale settling within ADC aperture time at 1MSPS sampling rates. Use Value: 90MHz bandwidth and 350V/µs slew rate support 0.01% settling in <40ns for 2VPP steps - meeting timing requirements of fast SAR converters. |
| Ultrasonic Flow Meter Front-End | High-Gain Active Filter Design |
Use Scenario: Amplifying weak echo signals (100kHz–1MHz) from piezoelectric transducers in clamp-on flow meters with low-power constraints. IC Role / Device Role / Timing Role: First-stage low-noise amplifier before programmable gain and anti-alias filtering. Use Value: 300MHz GBP and 1.8nV/√Hz noise allow high closed-loop gain (≥50V/V) while maintaining >1MHz small-signal bandwidth - resolving time-of-flight differences with sub-nanosecond jitter. | Use Scenario: Implementing 4th-order Butterworth or Chebyshev filters in medical ECG monitors requiring low distortion and DC stability. IC Role / Device Role / Timing Role: Active filter section (e.g., biquad stage) providing precise pole placement and gain control. Use Value: ±125µV max input offset and <±1.6µV/°C drift minimize baseline wander; –120dBc HD3 at 100kHz ensures clean spectral response for diagnostic signal fidelity. |
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 |
|---|---|---|---|
| OPA837IDCKR | 50MHz GBP, 0.625mA IQ, 4.7nV/√Hz noise - lower speed and higher noise than OPA838IDBVT. | Suitable for lower-bandwidth, cost-sensitive TIA or filter designs where 90MHz is unnecessary. | Select when power budget is tighter (<650µA) and noise floor >4nV/√Hz is acceptable. |
| OPA836IDBVR | 110MHz GBP, 1mA IQ, 4.8nV/√Hz noise - moderate speed/noise trade-off vs. OPA838IDBVT. | Better suited for general-purpose high-speed buffering where ultra-low noise is secondary to ease of use. | Choose for non-critical gain stages needing simpler compensation (unity-gain stable) and relaxed noise specs. |
Compared with OPA838IDBVT, OPA837IDCKR offers lower power but sacrifices 6× bandwidth and 2.6× noise performance; OPA836IDBVR provides unity-gain stability and broader application flexibility at the cost of 3.7× higher input noise - making OPA838IDBVT the optimal choice for noise-limited, high-gain, bandwidth-critical signal chains.
Availability
OPA838IDBVT is available at Aetrix Electronics and suitable for low-noise transimpedance amplifiers, SAR ADC drivers, and ultrasonic flow meter front-ends requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for OPA838IDBVT 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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The OPA838 belongs to TI's high-speed precision op amp portfolio, engineered specifically for low-noise, low-power, high-gain signal conditioning in photodiode interfaces, precision data acquisition, and ultrasound signal chains.
FAQ
What is the minimum stable gain for OPA838IDBVT?
The OPA838IDBVT is decompensated and requires a minimum noninverting gain of 6V/V for stable operation. At this gain, it achieves 90MHz small-signal bandwidth and 45MHz large-signal (4VPP) bandwidth. Using lower gains risks oscillation and is not supported by the datasheet.
Does OPA838IDBVT support true single-supply operation with ground-referenced inputs?
Yes. The OPA838IDBVT features a negative-rail input stage, allowing the input common-mode range to extend to VS– (typically ground in single-supply configurations). Its rail-to-rail output further enables full dynamic range utilization from 0V to VS+ in 3V or 5V systems.
How does the power-down feature of OPA838IDBVT function electrically?
The PD pin (Pin 5) is a CMOS-compatible digital input. Driving it above VS–+1.5V enables normal operation; pulling it below VS–+0.55V places the amplifier in shutdown, reducing quiescent current to ≤1µA. The pin draws <50nA bias current and exhibits 100ns turn-off and 3.5µs turn-on delays.
What is the maximum usable closed-loop gain for DC-coupled applications using OPA838IDBVT?
At dc-coupled gain of 1000V/V, the OPA838IDBVT maintains a 300kHz signal bandwidth with ≤±125mV output offset voltage (based on ±125µV max input offset). This makes it viable for precision DC-coupled amplification without external offset correction, provided bandwidth requirements stay within this limit.
Can OPA838IDBVT drive a 50Ω load directly?
No. The OPA838IDBVT is not designed for direct 50Ω driving. Its typical closed-loop output impedance is 0.3Ω at 1MHz, but continuous output current is rated ±20mA. Driving 50Ω at ±2.5V would require ±50mA - exceeding safe limits. A dedicated line driver or buffer stage is required for 50Ω termination.
OPA838IDBVT 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
OPA838IDBVT FAQ
1.How can I place an order for OPA838IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA838IDBVT 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 OPA838IDBVT reliable?
The price and inventory of OPA838IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA838IDBVT is usually 5 days.
3.What payment methods are accepted for OPA838IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA838IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA838IDBVT?
OPA838IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA838IDBVT 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 OPA838IDBVT?
For technical support, including OPA838IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA838IDBVT requirements.
6.How does Aetrix verify that OPA838IDBVT is sourced from the original manufacturer or authorized distributors?
All OPA838IDBVT 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 OPA838IDBVT meets industry standards.
7.What is the process for return or replacement of OPA838IDBVT?
All OPA838IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with OPA838IDBVT, 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 OPA838IDBVT part is unused and in its original packaging.
Return procedure for OPA838IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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