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Analog Devices Inc. LT1469AIDF-2#PBF
- Part No.:
- LT1469AIDF-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT1469AIDF-2#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:172
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Product details
Overview
LT1469AIDF-2#PBF from Analog Devices (acquired Linear Technology) is a dual, decompensated precision high-speed operational amplifier optimized for gain ≥ 2 configurations, delivering 200 MHz gain bandwidth, 30 V/µs slew rate, and 16-bit DC accuracy (max 125 µV input offset voltage, 3 µV/°C drift). It serves as a high-fidelity current-to-voltage converter for 16-bit DACs and low-distortion buffer for 16-bit ADCs in ±5 V or ±15 V systems.
For engineers reviewing the LT1469AIDF-2#PBF datasheet, LT1469AIDF-2#PBF pinout, LT1469AIDF-2#PBF application, or LT1469AIDF-2#PBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, 12-lead 4 mm × 4 mm DFN package with exposed ground pad, matched input bias current performance for inverting topologies, and full-specified settling time of 800 ns to 150 µV for 10 V step at AV = –1.
Technical Context
The LT1469AIDF-2#PBF uses a decompensated architecture requiring minimum closed-loop gain of 2 (AV ≥ 2) for stability-enabling higher bandwidth and slew rate than unity-gain-stable counterparts like the LT1469. Its input stage features trimmed inverting-input bias current (±10 nA max) for minimized error in I-to-V applications, while noninverting input bias current remains untrimmed (±40 nA max).
DC precision is maintained across temperature via laser-trimmed offset voltage (125 µV max at ±15 V, –40°C to +85°C) and low drift (3 µV/°C), paired with high open-loop gain (300 V/mV min into 2 kΩ) and 96.5 dB THD at 100 kHz. Total input noise is optimized for source impedances between 1 kΩ and 20 kΩ, balancing voltage and current noise contributions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 200 MHz - enables high loop gain at frequencies up to 100 kHz for low distortion in ADC buffering and active filter design |
| Slew Rate | 30 V/µs - supports full-scale 10 V output steps within <1 µs, critical for fast-settling DAC I-to-V conversion |
| Input Offset Voltage | 125 µV max (±15 V, –40°C to +85°C) - ensures ≤0.5 LSB error in 16-bit systems with 10 V full scale |
| Settling Time | 800 ns to 150 µV (10 V step, AV = –1) - meets timing budgets for high-throughput data acquisition |
| Supply Voltage Range | ±5 V to ±15 V - compatible with legacy industrial rails and modern low-voltage signal chains |
| Input Noise Density | 5 nV/√Hz (voltage), 0.6 pA/√Hz (current) - optimized total noise for 1–20 kΩ source resistances |
| Output Swing | ±12.8 V into 2 kΩ (±15 V supply) - delivers >95% of rail-to-rail swing for maximum dynamic range |
Pinout & Package
LT1469AIDF-2#PBF is housed in a 12-lead (4 mm × 4 mm) plastic DFN package with exposed thermal pad (Pin 13) connected to V–. The package supports high-density PCB layouts and enhanced thermal dissipation (θJA = 37°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 11, 12 | No Connect (N/C) | Unbonded pins; must be left floating or grounded per layout best practice-no internal connection |
| 5, 6 | +IN B / –IN B | Inverting and noninverting inputs of Channel B; trimmed bias current on –IN B minimizes I-to-V error |
| 7, 8 | +IN A / –IN A | Inverting and noninverting inputs of Channel A; identical trimming and matching to Channel B |
| 9, 10 | OUT A / OUT B | Amplified outputs; capable of ±12.8 V swing into 2 kΩ with <0.01% settling fidelity |
| 13 | Exposed Pad (GND) | Internally connected to V–; must be soldered to PCB ground plane for thermal and noise performance |
| V+ | Positive Supply | Accepts +5 V or +15 V; decoupling required within 1 cm using 0.01–0.1 µF ceramic + 1–10 µF tantalum |
| V– | Negative Supply | Accepts –5 V or –15 V; tied directly to exposed pad for lowest impedance return path |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit DC accuracy | Laser-trimmed input offset voltage (125 µV max) and drift (3 µV/°C) ensure sub-LSB error over temperature in precision data paths |
| Gain ≥ 2 stability | Decompensated design enables 200 MHz GBW and 30 V/µs slew rate-unattainable in unity-gain-stable equivalents |
| Inverting-input bias current trim | ±10 nA max at –IN pins reduces I-to-V conversion error in DAC output stages without requiring matched source resistors |
| Optimized total input noise | Minimum integrated noise at RS = 1–20 kΩ avoids trade-off penalties when selecting feedback networks for DAC buffers |
| High channel separation | 130 dB (±15 V) prevents crosstalk-induced distortion in dual-channel simultaneous sampling systems |
Applications
| 16-Bit DAC Current-to-Voltage Converter | ADC Buffer for High-Speed Data Acquisition |
|---|---|
Use Scenario: Converting output current from a 16-bit multiplying DAC (e.g., LTC1597) into a precise, low-noise voltage signal for analog processing. IC Role / Device Role / Timing Role: Precision I-to-V transimpedance amplifier operating at AV = –1 with external 2 kΩ feedback resistor and 22 pF compensation capacitor. Use Value: Achieves <150 µV settling error in 800 ns for 10 V step, preserving full 16-bit linearity and minimizing glitch energy at DAC major carry transitions. | Use Scenario: Driving the input of a 16-bit, 333 ksps SAR ADC (e.g., LTC1604) in a sensor signal chain requiring wide bandwidth and low THD. IC Role / Device Role / Timing Role: Noninverting unity-gain buffer with 100 pF load capacitance, leveraging high open-loop gain (>300 V/mV) to maintain DC accuracy and low distortion. Use Value: Delivers –96.5 dB THD at 100 kHz and full 16-bit AC/DC performance-enabling 90 dB SINAD in the ADC without external calibration. |
| Low-Distortion Active Filter | Photodiode Amplifier for Precision Sensing |
Use Scenario: Implementing a 4th-order 100 kHz low-pass filter in medical instrumentation where phase linearity and harmonic suppression are critical. IC Role / Device Role / Timing Role: Dual-channel op amp configured as two cascaded 2nd-order Sallen-Key stages, each operating at AV = 2 for stability and bandwidth. Use Value: 200 MHz GBW ensures >60 dB open-loop gain at 100 kHz, suppressing filter passband ripple and group delay variation caused by finite gain error. | Use Scenario: Amplifying low-level current from a photodiode in analytical spectrometry, where dark current and input bias errors dominate SNR. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1 MΩ feedback resistor, leveraging trimmed –IN bias current to minimize offset drift vs. temperature. Use Value: ±10 nA max inverting input bias current and 0.3 µVP-P 0.1–10 Hz noise enable sub-picoamp resolution without active bias cancellation circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1469IS8-2#PBF | Same core specs but in 8-lead SOIC package; higher θJA (190°C/W); no exposed thermal pad | Better suited for prototyping or lower-power applications where thermal density is not limiting | Select when board space allows SOIC and thermal load is <100 mW per amplifier |
| LT1468CS8#PBF | Single-channel version; 90 MHz GBW, 22 V/µs slew rate; 75 µV max VOS; unity-gain stable | Applicable where gain <2 is required or single-channel operation suffices | Choose for unity-gain buffer roles or space-constrained single-channel designs needing tighter VOS |
Compared with LT1469IS8-2#PBF, the LT1469AIDF-2#PBF offers superior thermal performance and smaller footprint; versus LT1468CS8#PBF, it provides dual-channel integration and higher speed at the cost of gain constraint-making it optimal for matched, high-bandwidth, gain ≥ 2 signal paths.
Availability
LT1469AIDF-2#PBF is available at Aetrix Electronics and suitable for high-accuracy data acquisition systems, 16-bit DAC interface modules, and low-distortion active filter designs requiring stable component supply across extended temperature ranges.
Supply support for LT1469AIDF-2#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, formed through the acquisition of Linear Technology in 2017.
The LT1469 family was developed by Linear Technology specifically for precision, high-speed signal conditioning in 16-bit data converter interfaces-balancing laser-trimmed DC accuracy with RF-grade AC performance in compact packages.
FAQ
What is the minimum stable gain for LT1469AIDF-2#PBF?
The LT1469AIDF-2#PBF is decompensated and requires a minimum closed-loop gain of 2 (AV ≥ 2) for stability. This includes both inverting (AV = –2) and noninverting (AV = +2) configurations. Attempting unity-gain operation may cause peaking or oscillation. For AV = 1 applications, use the unity-gain-stable LT1469 instead. The LT1469AIDF-2#PBF datasheet specifies stability under AV ≥ 2 across –40°C to +85°C.
Does LT1469AIDF-2#PBF support ±5 V operation?
Yes, LT1469AIDF-2#PBF is fully specified for ±5 V operation across all key parameters-including input offset voltage (200 µV max), slew rate (22 V/µs min), and output swing (±2.8 V into 2 kΩ). Electrical characteristics tables explicitly list ±5 V test conditions, and the device maintains 16-bit accuracy and 800 ns settling performance at this supply level.
How is the exposed pad (Pin 13) of LT1469AIDF-2#PBF used?
The exposed pad (Pin 13) of LT1469AIDF-2#PBF is internally connected to V– and must be soldered to a PCB ground plane for optimal thermal dissipation (θJA = 37°C/W) and low-noise performance. Leaving it unconnected degrades thermal resistance by >5× and increases susceptibility to ground bounce. The pad occupies the center-bottom area of the 4 mm × 4 mm DFN footprint and requires appropriate stencil aperture and solder paste volume.
Can LT1469AIDF-2#PBF drive heavy capacitive loads?
LT1469AIDF-2#PBF is not optimized for direct driving of large capacitive loads (>100 pF) without isolation. Its output impedance rises above 100 kHz, risking instability with pure capacitive loads. For DAC output buffering (e.g., LTC1597 with ~20 pF capacitance), a series resistor (e.g., 22 Ω) between amplifier output and load is recommended. For >100 pF loads, add a small isolation resistor (10–50 Ω) and consider external compensation per Figure 1 in the LT1469-2 datasheet.
What distinguishes LT1469AIDF-2#PBF from LT1469IDF-2#PBF?
The LT1469AIDF-2#PBF features tighter initial input offset voltage (125 µV max vs. 300 µV max for LT1469IDF-2#PBF at ±15 V) and lower drift (3 µV/°C vs. 5 µV/°C), reflecting enhanced laser trimming. Both share the same –40°C to +85°C temperature grade, 12-lead DFN package, and electrical specifications otherwise. The "A" grade is selected for highest-accuracy 16-bit systems where sub-LSB error is mandatory across temperature.
LT1469AIDF-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 30V/µs
- Gain Bandwidth Product:
- 200 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 3 nA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 4.1mA (x2 Channels)
- Current - Output / Channel:
- 22 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x4)
LT1469AIDF-2#PBF FAQ
1.How can I place an order for LT1469AIDF-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1469AIDF-2#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 LT1469AIDF-2#PBF reliable?
The price and inventory of LT1469AIDF-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1469AIDF-2#PBF is usually 5 days.
3.What payment methods are accepted for LT1469AIDF-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1469AIDF-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1469AIDF-2#PBF?
LT1469AIDF-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1469AIDF-2#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 LT1469AIDF-2#PBF?
For technical support, including LT1469AIDF-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1469AIDF-2#PBF requirements.
6.How does Aetrix verify that LT1469AIDF-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT1469AIDF-2#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 LT1469AIDF-2#PBF meets industry standards.
7.What is the process for return or replacement of LT1469AIDF-2#PBF?
All LT1469AIDF-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1469AIDF-2#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 LT1469AIDF-2#PBF part is unused and in its original packaging.
Return procedure for LT1469AIDF-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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