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Texas Instruments OPA2328DGKT
- Part No.:
- OPA2328DGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA2328DGKT.pdf
- Description:
- DUAL-CHANNEL, PRECISION, 50-V OF
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
OPA2328DGKT from Texas Instruments is a dual-channel, precision rail-to-rail input/output CMOS operational amplifier with zero-crossover distortion, 40MHz gain-bandwidth, 1pA maximum input bias current, and 6.1nV/√Hz input voltage noise at 10kHz - optimized for high-linearity ADC driving in single-supply, low-voltage systems (2.2V to 5.5V).
For engineers reviewing the OPA2328DGKT datasheet, OPA2328DGKT pinout, OPA2328DGKT application, or OPA2328DGKT equivalent, this page delivers verified specifications, VSSOP-8 package terminal mapping, real-world use cases in medical imaging and optical sensing, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The OPA2328DGKT implements a proprietary e-trim™ architecture enabling ultra-low offset (±50µV max) and near-zero drift (±1µV/°C max) without auto-zero or chopper switching - preserving wideband signal integrity. Its linear PMOS input stage with internal charge pump extends common-mode range 100mV beyond both rails while maintaining 120dB CMRR across full VCM.
It delivers 30V/µs slew rate and 180ns 0.01% settling time into 10kΩ loads, supporting high-fidelity sampling of fast transients. The device is unity-gain stable and drives capacitive loads up to 100pF without external compensation in buffer configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 40MHz - enables stable closed-loop operation up to 10MHz at G = +10 for anti-aliasing filter design. |
| Input bias current | 1pA maximum - supports high-impedance photodiode and sensor interfaces with sub-nA photocurrent accuracy. |
| Input voltage noise | 6.1nV/√Hz at 10kHz - preserves SNR in precision signal chains feeding 16–20-bit ADCs. |
| Offset voltage | ±50µV maximum - reduces DC error in strain gauge, RTD, and bridge sensor front-ends. |
| Common-mode rejection | 120dB typical - maintains accuracy in noisy industrial environments with ground offsets up to ±100mV. |
| Supply voltage range | 2.2V to 5.5V single supply - compatible with Li-ion, USB, and low-power MCU I/O domains without level-shifting. |
| Slew rate | 30V/µs - ensures faithful reproduction of 10Vpp signals up to ~5MHz without slewing-induced distortion. |
Pinout & Package
VSSOP-8 (DGK) package: 2.3mm × 2.0mm body, 0.65mm pitch, exposed thermal pad on underside for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Output | Amplifier A output capable of rail-to-rail swing within 5mV of V+ and V− at light loads. |
| 2 (−IN A) | Input | Inverting input for channel A; accepts common-mode voltages from (V− − 0.1V) to (V+ + 0.1V). |
| 3 (+IN A) | Input | Noninverting input for channel A; same rail-to-rail common-mode range as −IN A. |
| 4 (V−) | Power | Negative supply rail; must be connected to system ground or negative reference in dual-supply configs. |
| 5 (V+) | Power | Positive supply rail; supplies both amplifiers and internal charge pump for rail-to-rail input operation. |
| 6 (−IN B) | Input | Inverting input for channel B; electrically isolated from channel A; identical specs and range. |
| 7 (OUT B) | Output | Amplifier B output; independent of OUT A; supports simultaneous dual-signal conditioning. |
| 8 (+IN B) | Input | Noninverting input for channel B; fully matched to +IN A for differential pair applications. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-crossover distortion topology | Eliminates input-stage transition artifacts across full common-mode range, enabling true linearity in precision instrumentation. |
| e-trim™ offset calibration | Provides factory-trimmed ±50µV max offset without chopper modulation, avoiding 1/f noise and switching artifacts. |
| Rail-to-rail input/output | Supports full-scale signal acquisition from 0V to VDD in single-supply systems, maximizing dynamic range utilization. |
| 1pA input bias current | Enables >1TΩ transimpedance gains in photodiode amplifiers with <100nV input-referred error at 25°C. |
| 40MHz bandwidth + 30V/µs SR | Allows accurate reconstruction of fast pulses (e.g., PET detector outputs) with minimal group delay variation. |
Applications
| Optical Module Signal Conditioning | CT Scanner Front-End Amplification |
|---|---|
Use Scenario: Amplifying low-level photocurrents from edge-emitting lasers and PIN diodes in coherent optical transceivers operating at 10–100Gbps. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) stage with 1pA input bias and 6.1nV/√Hz noise ensuring >65dB SNR at 10kHz. Use Value: Enables detection of sub-nA photocurrents without degrading bit-error-rate (BER) in high-speed fiber links. | Use Scenario: Buffering and gain-setting for scintillation detector outputs in computed tomography (CT) gantry electronics. IC Role / Device Role / Timing Role: High-speed, low-drift gain stage preceding 16-bit SAR ADCs sampling at 1MSPS. Use Value: 180ns 0.01% settling time and 120dB CMRR preserve pulse fidelity and reject EMI from rotating X-ray sources. |
| Multiparameter Patient Monitor | Chemistry Analyzer Sensor Interface |
Use Scenario: Simultaneous amplification of ECG, SpO₂, and NIBP signals in portable clinical monitors powered by 3.3V batteries. IC Role / Device Role / Timing Role: Dual-channel precision amplifier providing rail-to-rail input swing and 2.2V minimum supply operation. Use Value: Single-supply compatibility eliminates need for charge pumps or dual regulators, reducing BOM count and leakage paths. | Use Scenario: Interfacing electrochemical sensors (pH, ion-selective electrodes) requiring ultra-high input impedance and low drift. IC Role / Device Role / Timing Role: Low-bias, low-noise buffer isolating microamp-level sensor currents from ADC input capacitance. Use Value: 1pA max input bias prevents polarization errors in potentiometric measurements over multi-hour assays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2188AIDR | Lower bandwidth (2MHz), higher offset drift (±0.003µV/°C), no rail-to-rail input | Better long-term stability for DC-coupled integrators; unsuitable for fast ADC driving | Select when ultra-low drift dominates over speed and rail-to-rail input requirements. |
| ADA4522-2ARZ | Zero-drift architecture, 3MHz GBW, 5.8nV/√Hz noise, rail-to-rail output only | Superior DC accuracy but limited bandwidth restricts use in >100kHz signal paths | Prefer for µV-level DC measurements where 40MHz bandwidth is unnecessary. |
Compared with OPA2328DGKT, OPA2188AIDR trades 20× bandwidth for 10× lower drift and higher PSRR, while ADA4522-2ARZ offers superior DC precision at the cost of AC performance - making OPA2328DGKT optimal for mixed-signal applications demanding both speed and precision.
Availability
OPA2328DGKT is available at Aetrix Electronics and suitable for optical module design, CT scanner front-ends, multiparameter patient monitoring, and chemistry analyzer sensor interfaces requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for OPA2328DGKT 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 with deep expertise in precision signal chain design.
The OPAx328 family was engineered specifically for high-fidelity, single-supply data acquisition systems - targeting applications where rail-to-rail input linearity, low noise, and fast settling are critical to ADC performance.
FAQ
What is the maximum capacitive load the OPA2328DGKT can drive stably in unity-gain configuration?
The OPA2328DGKT remains unity-gain stable with pure capacitive loads up to 100pF, as confirmed in TI's SBOS957G datasheet Figure 5-28. For loads exceeding 100pF, a series output resistor (10Ω–50Ω) is recommended to restore phase margin. This capability makes the OPA2328DGKT suitable for direct connection to ADC input capacitors and PCB trace capacitance without external compensation networks.
Does the OPA2328DGKT include shutdown functionality?
No, the OPA2328DGKT does not include shutdown functionality. Per TI's device information table, only the "S" suffix variants (e.g., OPA2328S) feature a shutdown pin. The OPA2328DGKT is a dual-channel, non-shutdown version in VSSOP-8 packaging. If power gating is required, external enable circuitry or selection of OPA2328S variants is necessary.
What is the guaranteed input offset voltage specification for OPA2328DGKT over temperature?
The OPA2328DGKT guarantees ±50µV maximum input offset voltage at TA = 25°C, with ±1µV/°C maximum drift over –40°C to +125°C (per SBOS957G Section 5.7). This tight drift spec, enabled by e-trim™ technology, ensures minimal calibration burden in systems operating across wide ambient ranges like medical imaging equipment and outdoor industrial sensors.
Can the OPA2328DGKT operate from a 2.2V single supply?
Yes, the OPA2328DGKT is fully specified for operation from 2.2V to 5.5V single supply (Section 5.3). Its rail-to-rail input stage extends 100mV beyond both rails, and output swings within 5mV of each rail under light loads - enabling full-scale signal capture in battery-powered and energy-harvesting systems where supply headroom is constrained.
How does the e-trim™ technology in OPA2328DGKT differ from traditional chopper-stabilized op amps?
The OPA2328DGKT uses e-trim™ laser-trimming of input offset during wafer test - not chopper modulation. This avoids 1/f noise folding, clock feedthrough, and switching-induced transients. As a result, the OPA2328DGKT delivers broadband low-noise performance (6.1nV/√Hz at 10kHz) alongside DC precision, unlike chopper op amps which exhibit noise peaks at chopping frequency and harmonics.
OPA2328DGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- OPAx328
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 30V/µs
- Gain Bandwidth Product:
- 40 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 3 µV
- Current - Supply:
- 3.8mA (x2 Channels)
- Current - Output / Channel:
- 65 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA2328DGKT FAQ
1.How can I place an order for OPA2328DGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2328DGKT 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 OPA2328DGKT reliable?
The price and inventory of OPA2328DGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2328DGKT is usually 5 days.
3.What payment methods are accepted for OPA2328DGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2328DGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2328DGKT?
OPA2328DGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2328DGKT 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 OPA2328DGKT?
For technical support, including OPA2328DGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2328DGKT requirements.
6.How does Aetrix verify that OPA2328DGKT is sourced from the original manufacturer or authorized distributors?
All OPA2328DGKT 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 OPA2328DGKT meets industry standards.
7.What is the process for return or replacement of OPA2328DGKT?
All OPA2328DGKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA2328DGKT, 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 OPA2328DGKT part is unused and in its original packaging.
Return procedure for OPA2328DGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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