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Texas Instruments OPA728AIDGKT
- Part No.:
- OPA728AIDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA728AIDGKT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:610
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Product details
Overview
OPA728AIDGKT from Texas Instruments is a single-channel, e-trim™ high-precision CMOS operational amplifier with shutdown functionality in an MSOP-8 package. It delivers 20MHz gain-bandwidth, 30V/µs slew rate, 150µV max input offset voltage, 1.5µV/°C max drift, and 6nV/√Hz noise at 100kHz - optimized for transimpedance amplifiers in optical networking and precision active filters.
For engineers reviewing the OPA728AIDGKT datasheet, OPA728AIDGKT pinout, OPA728AIDGKT application, or OPA728AIDGKT equivalent, key selection criteria include its rail-to-rail output swing (150mV from rails), 4.3mA quiescent current (reduced to 6µA in shutdown), ±2V to ±6V or +4V to +12V supply range, and enable/reference pin architecture for dual-supply logic interfacing.
Technical Context
The OPA728AIDGKT implements e-trim™ digital post-package trimming to stabilize dc performance against packaging-induced stress shifts, achieving 150µV max offset and 1.5µV/°C max drift over –40°C to +125°C. Its CMOS input stage provides 500pA max bias current and 10¹¹Ω||5pF input impedance.
It features a Class AB rail-to-rail output stage capable of 40mA drive into 1kΩ loads, stable in unity-gain configuration, with 94dB min CMRR and 120dB open-loop gain at 25°C. The ENABLE/REF pin architecture supports logic-level shutdown control referenced to V– or ground in dual-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 20MHz - enables stable unity-gain operation and supports >100kHz closed-loop bandwidth in precision filter designs. |
| Input Offset Voltage (max) | 150µV - ensures <0.003% error in 1V full-scale instrumentation signal paths without external calibration. |
| Offset Drift (max) | 1.5µV/°C - maintains sub-180µV total offset shift across –40°C to +125°C industrial temperature range. |
| Slew Rate | 30V/µs - supports clean 5V step response within 350ns (0.1%) for ADC driver applications like ADS8342. |
| Quiescent Current | 4.3mA per channel - balances low power with high-speed performance; drops to 6µA in shutdown mode. |
| Supply Range | +4V to +12V or ±2V to ±6V - compatible with single-supply 5V/12V systems and dual-supply ±5V instrumentation rails. |
| Output Swing | Within 150mV of rails (RL ≥100kΩ) - maximizes dynamic range in low-voltage data acquisition front-ends. |
| THD+N | 0.0003% at 1kHz - meets high-fidelity audio and spectral purity requirements in active filter and DAC output stages. |
Pinout & Package
OPA728AIDGKT is housed in an 8-pin MSOP (VSSOP) package with exposed thermal die pad connected to V–. Pin 1 is Enable, Pin 2 is V+, Pin 3 is OUT, Pin 4 is NC, Pin 5 is REF, Pin 6 is IN–, Pin 7 is IN+, Pin 8 is V–.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Enable) | Shutdown control input | Active-high logic input referenced to REF pin; enables amplifier when > VREF + 2V, disables when < VREF + 0.8V. |
| 2 (V+) | Positive supply rail | Accepts +4V to +12V or +6V in dual-supply; bypass with 1nF ceramic + 1µF tantalum for stability. |
| 3 (OUT) | Amplifier output | Rail-to-rail output stage drives up to 40mA; swings within 150mV of V+ or V– under light load. |
| 4 (NC) | No internal connection | Not bonded; must be left unconnected or grounded per layout guidelines. |
| 5 (REF) | Enable reference voltage | Reference point for Enable pin; connect to V– (single-supply) or DGND (dual-supply) for proper logic threshold. |
| 6 (IN–) | Inverting input | High-impedance CMOS node (10¹¹Ω); accepts common-mode voltages from V– to (V+) – 2.5V. |
| 7 (IN+) | Non-inverting input | Same CMOS input structure as IN–; used for precision differential or single-ended sensing. |
| 8 (V–) | Negative supply rail | Connect exposed thermal pad to this pin; serves as ground reference in single-supply configurations. |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ post-package digital trimming | Eliminates packaging-induced offset shift, enabling 150µV max offset and 1.5µV/°C max drift over full temperature range. |
| Shutdown mode with logic-compatible enable | Reduces quiescent current from 4.3mA to 6µA; REF pin allows direct interface with standard CMOS logic in dual-supply systems. |
| Rail-to-rail output stage | Delivers 150mV output swing from rails with >110dB open-loop gain, preserving dynamic range in low-voltage signal chains. |
| Ultra-low input bias current | 500pA max enables high-impedance transimpedance amplifier designs for photodiode current-to-voltage conversion. |
| High PSRR and CMRR | 150µV/V PSRR and 94dB CMRR minimize errors from supply ripple and common-mode interference in precision measurement. |
| Stable in unity-gain configuration | Internally compensated for G = +1; no external compensation required for broadband buffer or gain-of-one applications. |
Applications
| Optical Power Monitoring | High-Speed ADC Driver |
|---|---|
Use Scenario: Converting photocurrent from PIN photodiodes in ONET modules to precise voltage signals for digital processing. IC Role / Device Role / Timing Role: Transimpedance amplifier (I/V converter) with 10MΩ feedback resistor and optional CF compensation. Use Value: 500pA max bias current prevents signal loss; 6nV/√Hz noise preserves SNR; 20MHz GBW supports >100kHz optical modulation bandwidth. | Use Scenario: Driving the input of 16-bit SAR ADCs such as ADS8342 with 600ns acquisition window and ±2.5V input range. IC Role / Device Role / Timing Role: Precision buffer/gain stage isolating ADC input capacitance and charge injection effects. Use Value: 350ns 0.1% settling time meets timing budget; rail-to-rail output ensures full-scale utilization; low THD+N avoids harmonic distortion in digitized waveform. |
| Single-Supply Active Filters | Process Control Signal Conditioning |
Use Scenario: Implementing 4-pole Butterworth low-pass filters in portable test equipment with +5V supply and ground-referenced inputs. IC Role / Device Role / Timing Role: High-linearity op amp in Sallen-Key topology with DC-coupled input and output. Use Value: Input common-mode range extends to GND; output swings to within 150mV of rails; 0.0003% THD+N maintains filter passband fidelity. | Use Scenario: Amplifying low-level sensor outputs (e.g., RTD, strain gauge bridges) in industrial PLC analog input modules operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with programmable gain and offset correction. Use Value: 1.5µV/°C max drift minimizes temperature-induced calibration drift; 120dB AOL ensures <0.001% gain error at G = 100. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA727AIDGKT | No shutdown function; identical pinout and dc/ac specs except missing ENABLE/REF pins. | Used where continuous operation is required and power cycling is unnecessary. | Select OPA727AIDGKT if shutdown capability is not needed and board layout must remain unchanged. |
| OPA2727AIDRBT | Dual-channel version in same DFN-8 package; shares 20MHz GBW, 150µV offset, but lacks shutdown and has different pinout. | Preferred for space-constrained dual-amplifier functions (e.g., differential driver + reference buffer). | Choose OPA2727AIDRBT only when two matched amplifiers are required and shutdown is not needed. |
Compared with OPA727AIDGKT and OPA2727AIDRBT, the OPA728AIDGKT uniquely integrates logic-controllable shutdown while maintaining identical precision performance and MSOP-8 footprint - making it optimal for battery-powered or thermally managed systems requiring on-demand power gating.
Availability
OPA728AIDGKT is available at Aetrix Electronics and suitable for optical networking transimpedance amplifiers, high-speed ADC drivers, single-supply active filters, and industrial process control signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for OPA728AIDGKT 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 communications markets.
The OPA728AIDGKT belongs to TI's e-trim™ precision op amp product line, engineered specifically for applications demanding ultra-low offset, minimal drift, and high-speed ac performance in compact packages.
FAQ
What is the maximum allowable supply voltage for OPA728AIDGKT?
The absolute maximum supply voltage for OPA728AIDGKT is +13.2V on V+ and –0.5V on V–, but the recommended operating range is +4V to +12V (single-supply) or ±2V to ±6V (dual-supply). Exceeding +12V or –6V risks permanent damage and voids warranty compliance per TI SBOS314H specifications.
How does the REF pin function in OPA728AIDGKT shutdown operation?
The REF pin on OPA728AIDGKT sets the reference voltage for the ENABLE input. When connected to V– (single-supply) or DGND (dual-supply), the amplifier enables when ENABLE > REF + 2V and disables when ENABLE < REF + 0.8V. This architecture allows direct interface with standard CMOS logic without level-shifting circuitry.
Can OPA728AIDGKT drive capacitive loads without oscillation?
OPA728AIDGKT is unity-gain stable but exhibits increasing overshoot with capacitive loads >20pF. For loads >30pF, TI recommends adding a 10Ω–20Ω series resistor inside the feedback loop (between output and feedback network) to damp ringing while preserving DC accuracy - as validated in Figure 30 of SBOS314H.
What is the thermal resistance (θJA) of the MSOP-8 package used by OPA728AIDGKT?
The MSOP-8 (DGK) package of OPA728AIDGKT has a junction-to-ambient thermal resistance (θJA) of 150°C/W under standard JEDEC conditions. With the exposed thermal die pad properly soldered to a PCB copper plane, effective θJA can be reduced significantly - TI recommends minimum 4 thermal vias under the pad for optimal heat dissipation.
Does OPA728AIDGKT require external compensation for unity-gain stability?
No, OPA728AIDGKT is internally compensated and fully stable in unity-gain (G = +1) configurations without external components. Its phase margin exceeds 60° at unity gain, as confirmed by the Gain/Phase vs Frequency plot (Figure 1) in SBOS314H - eliminating need for compensation networks in buffer or gain-of-one applications.
OPA728AIDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- e-trim™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 30V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 85 pA
- Voltage - Input Offset:
- 15 µV
- Current - Supply:
- 4.3mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA728AIDGKT FAQ
1.How can I place an order for OPA728AIDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA728AIDGKT 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 OPA728AIDGKT reliable?
The price and inventory of OPA728AIDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA728AIDGKT is usually 5 days.
3.What payment methods are accepted for OPA728AIDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA728AIDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA728AIDGKT?
OPA728AIDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA728AIDGKT 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 OPA728AIDGKT?
For technical support, including OPA728AIDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA728AIDGKT requirements.
6.How does Aetrix verify that OPA728AIDGKT is sourced from the original manufacturer or authorized distributors?
All OPA728AIDGKT 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 OPA728AIDGKT meets industry standards.
7.What is the process for return or replacement of OPA728AIDGKT?
All OPA728AIDGKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA728AIDGKT, 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 OPA728AIDGKT part is unused and in its original packaging.
Return procedure for OPA728AIDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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