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Texas Instruments OPA838IDCKR
- Part No.:
- OPA838IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA838IDCKR.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:162
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Product details
Overview
OPA838IDCKR 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 swing on a 2.7V–5.4V single supply.
For engineers reviewing the OPA838IDCKR datasheet, OPA838IDCKR pinout, OPA838IDCKR application, or OPA838IDCKR equivalent, this page provides verified package mapping (5-pin SC70), confirmed DC/AC performance at 3V/5V supplies, validated shutdown functionality, and real-world design context for transimpedance amplifiers, SAR ADC drivers, and active filters requiring sub-2nV/√Hz noise and <1mW power.
Technical Context
The OPA838IDCKR uses a decompensated architecture requiring minimum noninverting gain of 6V/V to ensure stability, yielding 90MHz –3dB bandwidth at 5V supply. Its negative-rail input stage enables true single-supply operation with common-mode range extending to VS–, while rail-to-rail output supports full dynamic range utilization in low-voltage systems.
Internal power-down control (PD pin) reduces quiescent current to <1µA, enabling duty-cycled sensing. Input offset voltage is trimmed to ±125µV max at 25°C with drift <±1.6µV/°C, supporting dc-coupled gains up to 1000V/V while maintaining ±125mV max output offset - critical for precision photodiode and sensor front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 300MHz - enables stable 6V/V gain with 90MHz bandwidth, suitable for high-speed photodiode amplification and filter stages. |
| Input voltage noise | 1.8nV/√Hz (>200Hz) - lowest in its power class, essential for preserving SNR in low-level current-to-voltage conversion. |
| Quiescent current | 950µA (typical) - allows battery-powered or energy-constrained designs to maintain high analog performance without thermal penalty. |
| Supply range | 2.7V to 5.4V - supports direct interface with Li-ion, USB, and logic-supply rails without LDO overhead. |
| Input offset voltage | ±125µV (max, 25°C) - enables accurate dc-coupled amplification at gains ≥1000V/V with predictable output offset ≤±125mV. |
| Power-down current | <1µA - reduces system standby power by >99.9% during idle periods in ultrasonic flow meters or portable instrumentation. |
| Small-signal bandwidth | 90MHz @ G=6V/V, 5V supply - sufficient for 12–16-bit SAR ADC sampling at ≥10MSPS with minimal settling error. |
Pinout & Package
The OPA838IDCKR is packaged in a 5-pin SC70 (DCK) measuring 2.0mm × 1.25mm, optimized for space-constrained PCB layouts in portable and medical sensors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Noninverting input | Accepts reference or signal source; supports common-mode down to VS– for true single-supply dc coupling. |
| VIN− | Inverting input | Primary feedback node; used for transimpedance configuration with photodiode anode connection. |
| VOUT | Amplifier output | Rail-to-rail swing (VS– + 0.05V to VS+ − 0.05V) preserves full-scale resolution into ADC or downstream stages. |
| VS+ | Positive supply | Operates from 2.7V–5.4V; PSRR >95dB minimizes supply ripple injection into sensitive analog paths. |
| VS− | Negative supply / ground | Reference for single-supply operation; input common-mode extends to VS−, enabling ground-referenced sensor interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage noise | 1.8nV/√Hz enables sub-picoamp photodiode current detection with >100dB SNR at 1kHz. |
| Trimmed input offset | ±125µV max ensures dc accuracy in high-gain transimpedance stages without external nulling circuitry. |
| Single-supply rail-to-rail output | Delivers full dynamic range into 12–16-bit SAR ADCs without level-shifting or dual supplies. |
| Integrated power-down control | PD pin reduces supply current to <1µA, enabling microsecond-scale wake-up for burst-mode sensing. |
| Stable at G ≥ 6V/V | Decompensated design achieves 300MHz GBW while minimizing die area and quiescent power vs unity-gain stable alternatives. |
Applications
| Photodiode Transimpedance Amplifier | Low-Power SAR ADC Driver |
|---|---|
Use Scenario: Amplifying weak current signals from large-area photodetectors (e.g., 100pF capacitance) in optical smoke detectors or pulse oximeters. IC Role / Device Role / Timing Role: Primary transimpedance stage converting pA-level photocurrent to clean voltage with minimal added noise and offset. Use Value: 1.8nV/√Hz input noise and <1.1pA/√Hz total input-referred current noise preserve signal integrity at 1MHz SSBW under 3V supply. | Use Scenario: Driving 12–16-bit successive-approximation register (SAR) ADC inputs in portable data loggers or handheld test equipment. IC Role / Device Role / Timing Role: High-fidelity buffer and gain stage ensuring fast settling (<40ns to 0.01%) and low distortion into ADC sample-and-hold capacitor. Use Value: 90MHz bandwidth and –120dBc HD3 at 100kHz enable accurate digitization of multi-kHz sensor waveforms with no gain-dependent distortion penalty. |
| Ultrasonic Flow Meter Front-End | High-Gain Active Filter |
Use Scenario: Conditioning echo signals in time-of-flight ultrasonic flow meters operating from 3V coin-cell batteries. IC Role / Device Role / Timing Role: Low-power, low-noise preamplifier stage capturing µV-level return pulses after acoustic propagation through fluid. Use Value: 45MHz large-signal bandwidth supports clean amplification of 2VPP pulses, while 950µA IQ extends battery life beyond 1 year in intermittent-read architectures. | Use Scenario: Implementing 4th-order high-pass or band-pass filters in ECG front-ends or vibration monitoring systems. IC Role / Device Role / Timing Role: Precision gain block in multiple-feedback or state-variable topologies requiring stable high-Q response. Use Value: 300MHz GBW and <±1.6µV/°C offset drift maintain filter cutoff accuracy across temperature, eliminating recalibration in industrial environments. |
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 |
|---|---|---|---|
| OPA837 | 50MHz GBW, 4.7nV/√Hz input noise, 0.625mA IQ - lower speed/noise trade-off for ultra-low-power use cases. | Limited to ≤10MHz signal bandwidth; insufficient for >10MSPS ADC driving or wideband photodiode amplification. | Select OPA837 only when bandwidth <50MHz and noise <5nV/√Hz are acceptable - e.g., battery-powered environmental sensors. |
| OPA836 | 110MHz GBW, 4.8nV/√Hz input noise, 1mA IQ - higher power than OPA838IDCKR but unity-gain stable. | Supports G=1 configurations without external compensation; lacks decompensated efficiency for fixed-G≥6 designs. | Choose OPA836 when flexibility across gain settings (including unity) outweighs need for lowest noise and highest GBW at G≥6. |
Compared with OPA837 and OPA836, the OPA838IDCKR delivers the highest GBW-to-noise ratio (300MHz / 1.8nV/√Hz) and lowest quiescent current per MHz of bandwidth - making it optimal for fixed-gain, high-fidelity, low-power signal chains where stability at G≥6 is acceptable.
Availability
OPA838IDCKR is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, 12–16-bit SAR ADC drivers, and ultrasonic flow meter front-ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for OPA838IDCKR 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 over 90 years of innovation in precision amplifiers and signal chain solutions.
The OPA838IDCKR belongs to TI's high-speed, low-noise operational amplifier product line, engineered specifically for power-constrained, noise-sensitive applications including optical sensing, portable medical instrumentation, and precision data acquisition.
FAQ
What is the minimum stable gain for OPA838IDCKR?
The OPA838IDCKR is decompensated and requires a minimum noninverting gain of 6V/V for stable operation. At this gain, it achieves 90MHz –3dB bandwidth with 5V supply. Attempting unity-gain or G<6 configurations may cause peaking or oscillation unless external compensation is applied - always verify phase margin in final layout using TI's TINA-TI simulation models for OPA838IDCKR.
Does OPA838IDCKR support true single-supply operation with ground-referenced inputs?
Yes. The OPA838IDCKR features a negative-rail input stage, allowing the common-mode input range to extend to VS– (typically ground in single-supply configurations). This enables direct connection of grounded sensors like photodiodes or bridge elements without level-shifting circuitry - a key enabler for the OPA838IDCKR's use in low-voltage, dc-coupled transimpedance designs.
How does the power-down feature of OPA838IDCKR function?
The OPA838IDCKR's PD pin disables the amplifier core when driven below VS– + 0.55V, reducing quiescent current to <1µA. When pulled above VS– + 1.5V, normal operation resumes with 3.5µs typical turn-on delay. This pin must be actively driven - floating or resistor-biased configurations are not recommended. The OPA838IDCKR's fast wake-up supports burst-mode sensing in battery-powered ultrasonic or optical systems.
What is the maximum usable gain for dc-coupled applications using OPA838IDCKR?
At dc-coupled gain of 1000V/V, the OPA838IDCKR maintains a 300kHz signal bandwidth with maximum output offset voltage of ±125mV - directly enabled by its ±125µV max input offset and <±1.6µV/°C drift. This makes the OPA838IDCKR suitable for precision photodiode amplifiers and strain gauge interfaces where high gain and dc accuracy are simultaneously required without external trimming.
Which package variant does OPA838IDCKR correspond to?
OPA838IDCKR uses the 5-pin SC70 (DCK) package, measuring 2.0mm × 1.25mm. This variant omits the power-down (PD) pin found in the 6-pin SOT-23 and 6-pin SC70 versions, simplifying layout in space-constrained applications where continuous operation is preferred. Pinout is VIN+, VIN−, VOUT, VS+, and VS− - no NC or PD pins.
OPA838IDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- SC-70-5
OPA838IDCKR FAQ
1.How can I place an order for OPA838IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA838IDCKR 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 OPA838IDCKR reliable?
The price and inventory of OPA838IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA838IDCKR is usually 5 days.
3.What payment methods are accepted for OPA838IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA838IDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA838IDCKR?
OPA838IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA838IDCKR 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 OPA838IDCKR?
For technical support, including OPA838IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA838IDCKR requirements.
6.How does Aetrix verify that OPA838IDCKR is sourced from the original manufacturer or authorized distributors?
All OPA838IDCKR 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 OPA838IDCKR meets industry standards.
7.What is the process for return or replacement of OPA838IDCKR?
All OPA838IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA838IDCKR, 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 OPA838IDCKR part is unused and in its original packaging.
Return procedure for OPA838IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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