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Texas Instruments OPA2205ADT
- Part No.:
- OPA2205ADT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2205ADT.pdf
- Description:
- DUAL, RAIL-TO-RAIL BIPOLAR PRECI
- Quantity:
- Payment:
- Shipping:
Inventory:244
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Product details
Overview
OPA2205ADT from Texas Instruments is a dual-channel, high-precision, bipolar e-trim™ operational amplifier with super-beta inputs. It delivers 25 µV max input offset voltage, ±0.2 µV/°C max offset drift, 7.2 nV/√Hz voltage noise, 3.6 MHz gain bandwidth, and rail-to-rail output - optimized for low-power, high-accuracy signal conditioning in precision analog front-ends of industrial transmitters and data acquisition systems.
For engineers reviewing the OPA2205ADT datasheet, OPA2205ADT pinout, OPA2205ADT application, or OPA2205ADT equivalent, key selection criteria include its high-grade offset performance (±2 µV typical), ultra-low bias current (100 pA typical), EMI-filtered inputs, ±4.5 V to ±18 V dual-supply operation, and SOIC-8 packaging suitable for space-constrained, thermally stable instrumentation designs.
Technical Context
The OPA2205ADT implements TI's proprietary e-trim™ technology on a bipolar process to achieve sub-5 µV typical offset and <0.1 µV/°C typical drift across –40°C to +125°C. Its super-beta input stage enables 100 pA typical input bias current while maintaining 110 fA/√Hz current noise density - critical for high-impedance sensor interfaces.
With 126 dB minimum open-loop gain, CMRR, and PSRR over full temperature range, plus 4 V/µs slew rate and overload power limiting, the device supports stable closed-loop operation in demanding DC-coupled measurement paths without external compensation - especially in low-noise, low-drift applications like source measurement units and pressure transmitters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±2 µV typical, ±15 µV max - enables <1 LSB error in 20-bit ADC systems at room temperature |
| Offset Voltage Drift | ±0.04 µV/°C typical, ±0.2 µV/°C max - ensures <0.5 µV total drift over 100°C span |
| Gain Bandwidth Product | 3.6 MHz - supports stable unity-gain buffering up to ~300 kHz with 67° phase margin |
| Input Voltage Noise | 7.2 nV/√Hz at 1 kHz - preserves SNR in µV-level sensor amplification stages |
| Quiescent Current | 220 µA per amplifier max - allows dual-channel precision amplification within 500 µA total supply budget |
| Supply Range | ±2.25 V to ±18 V - compatible with standard industrial ±5 V, ±12 V, and ±15 V rails |
| Output Swing | Rail-to-rail - delivers full dynamic range into 10 kΩ load, with only 200 mV headroom at each rail |
Pinout & Package
OPA2205ADT is packaged in an 8-pin SOIC (D package) with exposed pad thermal enhancement. The package meets JEDEC MS-012AC, has 1.27 mm pitch, and supports standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 3) | Noninverting input, Channel A | High-impedance node for differential sensing; super-beta input minimizes leakage-induced errors |
| –IN A (Pin 2) | Inverting input, Channel A | Accepts feedback network; EMI filtering reduces RF susceptibility in noisy environments |
| +IN B (Pin 5) | Noninverting input, Channel B | Independent high-Z input for second sensor channel or reference buffer |
| –IN B (Pin 6) | Inverting input, Channel B | Supports independent gain configuration per channel without crosstalk |
| OUT A (Pin 1) | Output, Channel A | Rail-to-rail capable; drives 10 kΩ loads with <200 mV saturation margin |
| OUT B (Pin 7) | Output, Channel B | Electrically isolated output path; channel separation >130 dB at DC prevents inter-channel coupling |
| V+ (Pin 8) | Positive supply | Connects to highest potential rail; internal ESD protection rated to ±2000 V HBM |
| V– (Pin 4) | Negative supply | Connects to lowest potential rail; supports true dual-supply operation down to ±2.25 V |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ offset calibration | Eliminates need for external nulling; achieves ±2 µV typical offset without laser trimming |
| Super-beta input stage | Delivers 100 pA typical input bias current - critical for guarding high-Z pH or piezoresistive sensors |
| EMI/RFI filtered inputs | Rejects >80 dB of 900 MHz cellular interference - essential in field-deployed instrumentation |
| Rail-to-rail output | Maximizes usable dynamic range in single-supply or low-headroom systems (e.g., battery-powered DAQ) |
| Overload power limiter | Prevents thermal runaway during output short-circuit - improves system reliability in unattended operation |
Applications
| Flow Transmitter | Data Acquisition (DAQ) |
|---|---|
Use Scenario: Amplifying low-level differential signals from Coriolis or magnetic flow sensors in hazardous-area loop-powered transmitters. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with ultra-low drift and noise to resolve sub-0.1% flow accuracy. Use Value: ±0.2 µV/°C drift ensures <0.05% FS error over ambient temperature swings - eliminating costly thermal recalibration. | Use Scenario: Signal conditioning for multi-channel, portable 18-bit+ data loggers measuring thermocouples, strain gauges, and RTDs. IC Role / Device Role / Timing Role: Dual-channel programmable gain amplifier (PGA) stage with matched DC specs across channels. Use Value: 25 µV max offset and 126 dB CMRR enable >100 dB effective resolution without auto-zero circuitry. |
| Pressure Transmitter | Source Measurement Unit (SMU) |
Use Scenario: Conditioning bridge outputs from MEMS or silicon piezoresistive pressure sensors in HVAC and industrial control systems. IC Role / Device Role / Timing Role: Low-noise, low-drift difference amplifier with rail-to-rail output driving ADC reference buffers. Use Value: 7.2 nV/√Hz noise and 3.6 MHz GBW support fast settling (<3 µs to 12-bit) for high-throughput pressure scanning. | Use Scenario: Precision current sourcing and voltage sensing in semiconductor parametric test equipment requiring pA-level compliance. IC Role / Device Role / Timing Role: Dual-opamp core for force-sense architecture: one channel sources, the other senses with matched gain/offset. Use Value: Channel-to-channel offset matching <5 µV and drift tracking <0.05 µV/°C minimize forcing errors below 100 pA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2189IDR | Zero-drift auto-zero architecture; 0.003 µV/°C max drift vs OPA2205ADT's ±0.2 µV/°C; higher 5.2 nV/√Hz noise | Better for near-DC, ultra-stable offset; less suitable for wideband sensor excitation due to chopping artifacts | Select OPA2189IDR when long-term DC stability dominates over wideband noise performance |
| ADA4522-2ARZ | Zero-drift design; 0.015 µV/°C max drift; 5.8 nV/√Hz noise; requires external charge dump capacitor | Superior drift spec but larger PCB footprint and added BOM complexity vs OPA2205ADT's monolithic solution | Choose ADA4522-2ARZ only if drift budget demands <0.02 µV/°C and layout area is unconstrained |
Compared with OPA2189IDR and ADA4522-2ARZ, the OPA2205ADT offers the best balance of ultra-low drift, low noise, and simplicity - delivering <0.2 µV/°C drift without chopping artifacts or external components, making it ideal for high-fidelity analog front-ends where signal integrity and layout efficiency are co-priorities.
Availability
OPA2205ADT is available at Aetrix Electronics and suitable for flow transmitters, pressure transmitters, and portable data acquisition systems requiring stable component supply, long-term calibration retention, and industrial temperature range operation.
Supply support for OPA2205ADT 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 decades of heritage in precision op amps and signal chain solutions.
The OPA2205ADT belongs to TI's OPAx205 family - engineered specifically for high-accuracy, low-power industrial measurement systems where offset drift, input bias, and noise must be minimized without sacrificing bandwidth or robustness.
FAQ
What is the maximum operating temperature range for the OPA2205ADT?
The OPA2205ADT is specified for continuous operation from –40°C to +125°C ambient temperature. This extended industrial range is validated across all key parameters including offset voltage drift (±0.2 µV/°C max), open-loop gain (>126 dB), and quiescent current (≤310 µA per amplifier), ensuring reliable performance in harsh environments such as factory-floor transmitters and outdoor instrumentation.
Does the OPA2205ADT require external compensation for unity-gain stability?
No, the OPA2205ADT is internally compensated for unity-gain stability. With a phase margin of 67° at 10 kΩ load and 25 pF capacitance, it drives capacitive loads up to 30 pF without oscillation. Its 3.6 MHz gain-bandwidth product and optimized internal compensation allow direct use in buffer, inverter, and follower configurations without external components - simplifying layout and reducing BOM count.
How does the e-trim™ technology in the OPA2205ADT differ from traditional laser trimming?
The OPA2205ADT uses TI's monolithic e-trim™ process - a post-package electrical trimming method that adjusts offset voltage using on-chip EEPROM-like memory elements. Unlike laser trimming, e-trim™ avoids mechanical stress-induced drift and achieves tighter initial tolerance (±2 µV typical) with superior long-term stability. This eliminates the need for external nulling circuits while maintaining performance across temperature and time.
Can the OPA2205ADT drive a 2-kΩ load while maintaining rail-to-rail output swing?
Yes, the OPA2205ADT maintains rail-to-rail output swing into 2 kΩ loads: output voltage reaches within 350 mV of each rail at ±15 V supply (per Electrical Characteristics Table 6.8). At lower supplies (e.g., ±5 V), the swing degrades to within 200 mV of rails under same load - enabling full-scale utilization of ADC input ranges in both high- and low-voltage industrial systems.
Is the OPA2205ADT pin-compatible with legacy OPA227 or OPA277 devices?
No, the OPA2205ADT is not pin-compatible with OPA227 or OPA277. While functionally similar as precision bipolar op amps, the OPA2205ADT uses an 8-pin SOIC pinout with dedicated dual-channel inputs/outputs (Pins 2,3,5,6,1,7), whereas OPA227/OPA277 use different pin assignments (e.g., Pin 1 = offset null). Migration requires PCB layout revision, though the OPA2205ADT's improved specs justify redesign in new precision measurement platforms.
OPA2205ADT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- e-trim™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- 3.6 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 pA
- Voltage - Input Offset:
- 4 µV
- Current - Supply:
- 220µA (x2 Channels)
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2205ADT FAQ
1.How can I place an order for OPA2205ADT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2205ADT 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 OPA2205ADT reliable?
The price and inventory of OPA2205ADT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2205ADT is usually 5 days.
3.What payment methods are accepted for OPA2205ADT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2205ADT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2205ADT?
OPA2205ADT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2205ADT 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 OPA2205ADT?
For technical support, including OPA2205ADT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2205ADT requirements.
6.How does Aetrix verify that OPA2205ADT is sourced from the original manufacturer or authorized distributors?
All OPA2205ADT 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 OPA2205ADT meets industry standards.
7.What is the process for return or replacement of OPA2205ADT?
All OPA2205ADT units undergo pre-shipment inspection (PSI). If there is an issue with OPA2205ADT, 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 OPA2205ADT part is unused and in its original packaging.
Return procedure for OPA2205ADT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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