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Analog Devices Inc. LT6231IDD#PBF
- Part No.:
- LT6231IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT6231IDD#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,057
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Product details
Overview
LT6231IDD#PBF from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail output, low-noise, unity-gain stable operational amplifier in an 8-lead 3mm × 3mm DFN package. It delivers 1.1nV/√Hz input voltage noise, 3.5mA per amplifier supply current, 215MHz gain-bandwidth product, and ±30mA output drive-optimized for low-voltage signal conditioning in ultrasound amplifiers and A/D driver circuits.
For engineers reviewing the LT6231IDD#PBF datasheet, LT6231IDD#PBF pinout, LT6231IDD#PBF application, or LT6231IDD#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The LT6231IDD#PBF integrates two independent high-speed op amps sharing a common V+ and V– supply, each featuring a dedicated enable pin for independent power gating. Its architecture supports unity-gain stability while maintaining 70V/µs slew rate and full-power bandwidth up to 6.3MHz at 5V supply.
It operates across a 3V to 12.6V total supply range (±1.5V to ±5V), with rail-to-rail output swing within 50mV of either rail and guaranteed performance over –40°C to 85°C. Input common-mode range extends to within 1.5V of V– and 4V of V+ on 5V supplies, enabling wide dynamic range in single-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Voltage Density | 1.1nV/√Hz at 10kHz - enables high-resolution sensor signal amplification without degrading SNR in precision front-ends. |
| Gain-Bandwidth Product | 215MHz at AV ≥ 1 - supports stable closed-loop operation up to ~20MHz with moderate gain, suitable for anti-aliasing filters and wideband buffers. |
| Slew Rate | 70V/µs - ensures faithful reproduction of fast transient signals (e.g., pulse echoes in ultrasound) without slew-induced distortion. |
| Supply Current per Amp | 3.5mA max - allows dual-channel high-speed amplification within tight power budgets (e.g., portable medical or battery-powered instrumentation). |
| Output Drive | ±30mA short-circuit current - directly drives 50Ω transmission lines or ADC input networks without external buffering. |
| Rail-to-Rail Output | Swings within 50mV of V+ and V– - maximizes usable signal swing in 3.3V or 5V systems, improving effective resolution of downstream 12–16-bit ADCs. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and automotive under-hood environments where thermal stability is critical. |
Pinout & Package
LT6231IDD#PBF uses an 8-lead (3mm × 3mm) plastic DFN package with exposed metal pad connected to V–. The package supports high-density PCB layouts and enhanced thermal performance (θJA = 160°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT A | Amplifier A output | Low-impedance buffered output capable of sourcing/sinking ±30mA; connects directly to ADC inputs or filter stages. |
| 2: –IN A | Inverting input A | Differential input node for A channel; matched to +IN A for CMRR >115dB; requires symmetric layout for optimal noise rejection. |
| 3: +IN A | Non-inverting input A | High-impedance input (6.5MΩ common-mode); used for unity-gain buffer or non-inverting gain configurations. |
| 4: V– | Negative supply / ground reference | Power return path and thermal pad connection point; must be solidly connected to PCB ground plane for EMI and thermal control. |
| 5: V+ | Positive supply | Accepts 3V–12.6V total supply; decoupling capacitor (≥1µF ceramic) required within 2mm for high-frequency stability. |
| 6: OUT B | Amplifier B output | Independent output identical in performance to OUT A; enables dual-path signal processing (e.g., I/Q channels or differential driver pairs). |
| 7: –IN B | Inverting input B | Second amplifier's inverting input; channel-to-channel matching (e.g., offset voltage match ≤1000µV) supports precision dual applications. |
| 8: +IN B | Non-inverting input B | Second amplifier's non-inverting input; fully independent-no internal coupling between A and B channels. |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Each amplifier has dedicated ENABLE pin reducing supply current to ≤4.4µA (I-grade), enabling power-gated multi-stage analog chains. |
| Ultra-low noise efficiency | en·√ISUPPLY = 1.9 - among lowest noise-power products for op amps, critical for battery-operated low-amplitude signal detection. |
| Unity-gain stable | No external compensation required - simplifies layout and reduces BOM count in high-speed gain-of-1 or gain-of-2 configurations. |
| High PSRR & CMRR | 115dB PSRR and CMRR (typ) - rejects supply ripple and common-mode interference in noisy mixed-signal environments (e.g., motor-driven medical equipment). |
| Wide supply flexibility | Operates from 3V single supply to ±5V dual supply - eliminates need for separate voltage rails in compact embedded systems. |
Applications
| Ultrasound Signal Amplification | A/D Converter Driver |
|---|---|
|
Use Scenario: Amplifying weak, high-frequency echo signals (1–15MHz) from piezoelectric transducers before digitization. IC Role / Device Role / Timing Role: Low-noise, wideband preamplifier and variable-gain stage with rail-to-rail output swing matching ADC input range. Use Value: 1.1nV/√Hz noise floor preserves small-signal integrity; 70V/µs slew rate avoids distortion on fast echo edges; dual-channel layout minimizes inter-channel crosstalk in beamforming arrays. |
Use Scenario: Driving SAR or pipeline ADC inputs with fast settling, low distortion, and precise DC accuracy. IC Role / Device Role / Timing Role: High-speed buffer and level-shifter ensuring full-scale analog input compliance and <55ns 0.1% settling time. Use Value: 215MHz GBW and 70V/µs slew rate enable clean 10+ MSPS sampling; rail-to-rail output maximizes ADC utilization; low THD (<–80dBc at 1MHz) prevents harmonic aliasing. |
| Active Filter Stage | Rail-to-Rail Sensor Interface |
|
Use Scenario: Implementing 4th-order low-pass or band-pass filters in portable diagnostic equipment. IC Role / Device Role / Timing Role: Dual op amp configured as cascaded Sallen-Key or MFB stages with precise component matching. Use Value: Unity-gain stability allows direct use in filter feedback paths; 215MHz GBW supports filter cutoffs up to ~5MHz; low input bias current (≤12µA) avoids RC time constant drift. |
Use Scenario: Conditioning outputs from MEMS accelerometers, bridge sensors, or current-sense amplifiers operating near supply rails. IC Role / Device Role / Timing Role: Rail-to-rail input/output instrumentation buffer that preserves full dynamic range of low-voltage sensors. Use Value: Input CM range includes V– and V+, allowing direct connection to grounded sensors; output swings to within 50mV of rails, maximizing SNR in 3.3V systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4898-2ARMZ | Higher noise (1.0nV/√Hz), higher supply current (10.5mA/amp), wider GBW (290MHz), no enable pin. | Better for ultra-wideband (>50MHz) applications but less suitable for power-constrained portable designs. | Choose ADA4898-2ARMZ when bandwidth >250MHz is required and shutdown functionality is unnecessary. |
| OPA2837IRUGR | Lower noise (0.95nV/√Hz), lower supply current (2.2mA/amp), lower GBW (110MHz), no enable pin, different pinout. | Optimized for ultra-low-power, medium-bandwidth applications (e.g., handheld test gear), not for >10MHz signal chains. | Choose OPA2837IRUGR when sub-3mA power budget is mandatory and bandwidth ≤8MHz suffices. |
Compared with LT6231IDD#PBF, ADA4898-2ARMZ trades 3× higher quiescent power for +75MHz GBW and slightly better noise, while OPA2837IRUGR reduces power by 37% but sacrifices 52% bandwidth and lacks enable control-making LT6231IDD#PBF the balanced choice for dual-channel, low-noise, medium-high speed, and power-gatable designs.
Availability
LT6231IDD#PBF is available at Aetrix Electronics and suitable for ultrasound imaging systems, high-speed data acquisition modules, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT6231IDD#PBF 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
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT6231 belongs to Linear Technology's precision, high-speed op amp family designed specifically for low-noise, low-power, rail-to-rail signal conditioning in medical, test & measurement, and communications infrastructure.
FAQ
What is the operating temperature range for LT6231IDD#PBF?
The LT6231IDD#PBF is specified for continuous operation from –40°C to +85°C. This industrial-grade temperature range is verified per the "I" grade marking in the part number and confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables across all supply conditions (3.3V, 5V, ±5V). The DFN package's thermal design supports reliable junction temperatures under sustained load.
Does LT6231IDD#PBF include an enable function for power management?
Yes, LT6231IDD#PBF features two independent ENABLE pins-one per amplifier-allowing selective shutdown. When ENABLE is pulled to V+ – 0.2V, supply current drops to ≤4.4µA per amplifier (I-grade), enabling dynamic power scaling in multi-stage analog signal chains without disabling the entire device.
What is the maximum supply voltage rating for LT6231IDD#PBF?
The absolute maximum total supply voltage (V+ to V–) for LT6231IDD#PBF is 12.6V. This allows operation from ±5V (10V total), +12V single supply, or any combination within that limit. Exceeding 12.6V risks permanent damage, as stated in the Absolute Maximum Ratings table.
Can LT6231IDD#PBF drive a 50Ω load directly?
Yes, LT6231IDD#PBF can drive a 50Ω load directly: its ±30mA short-circuit current and 70V/µs slew rate support full-scale 2VP-P output into 50Ω at frequencies up to ~5MHz. For sustained 50Ω driving, ensure adequate PCB copper area under the exposed V– pad for thermal dissipation.
Is LT6231IDD#PBF unity-gain stable?
Yes, LT6231IDD#PBF is explicitly unity-gain stable per the datasheet description and electrical specifications. No external compensation is required for closed-loop gains ≥1, making it suitable for buffer, follower, and low-gain active filter configurations without risk of oscillation.
LT6231IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 70V/µs
- Gain Bandwidth Product:
- 215 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 450 µV
- Current - Supply:
- 3.3mA (x2 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT6231IDD#PBF FAQ
1.How can I place an order for LT6231IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6231IDD#PBF 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 LT6231IDD#PBF reliable?
The price and inventory of LT6231IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6231IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT6231IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6231IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6231IDD#PBF?
LT6231IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6231IDD#PBF 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 LT6231IDD#PBF?
For technical support, including LT6231IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6231IDD#PBF requirements.
6.How does Aetrix verify that LT6231IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT6231IDD#PBF 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 LT6231IDD#PBF meets industry standards.
7.What is the process for return or replacement of LT6231IDD#PBF?
All LT6231IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6231IDD#PBF, 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 LT6231IDD#PBF part is unused and in its original packaging.
Return procedure for LT6231IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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