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Analog Devices Inc. LT1468AIDD#PBF
- Part No.:
- LT1468AIDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT1468AIDD#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,718
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Product details
Overview
LT1468AIDD#PBF from Analog Devices (formerly Linear Technology) is a precision high-speed operational amplifier optimized for 16-bit data acquisition systems, delivering 90 MHz gain bandwidth, 22 V/µs slew rate, and 900 ns settling time to 150 µV for 10 V steps. Its tailored input offset voltage (max 75 µV), low drift (2 µV/°C), and bias current cancellation make it ideal for inverting DAC current-to-voltage conversion and ADC buffering in industrial instrumentation.
For engineers reviewing the LT1468AIDD#PBF datasheet, LT1468AIDD#PBF pinout, LT1468AIDD#PBF application, or LT1468AIDD#PBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, DFN-8 (3 mm × 3 mm) package with exposed thermal pad, unity-gain stability, and total input noise optimization for source resistances between 1 kΩ and 20 kΩ.
Technical Context
The LT1468AIDD#PBF employs a complementary bipolar process to achieve simultaneous high DC precision and wideband AC performance. Its input stage features factory-trimmed inverting input bias current (IB– ≤ ±10 nA) and low input offset voltage drift (≤2 µV/°C), specifically engineered for inverting configurations like DAC I-to-V converters where common-mode rejection and thermal stability are critical.
Internally compensated for unity-gain stability, the device maintains ≥90 MHz gain bandwidth at ±15 V supplies and delivers full 16-bit accuracy up to 100 kHz - verified by –96.5 dB THD at 100 kHz, 10 VP-P, and 150 µV settling in inverting gain = –1 configuration with 2 kΩ load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 90 MHz at ±15 V - ensures >100 dB open-loop gain at 100 kHz for distortion reduction in ADC buffer applications. |
| Slew Rate | 22 V/µs at ±15 V - enables clean large-signal response in active filters and instrumentation amplifiers without slewing-induced distortion. |
| Settling Time | 900 ns to 150 µV (10 V step, AV = –1) - supports 16-bit settling in high-speed DAC output conditioning with minimal dead time. |
| Input Offset Voltage | Max 75 µV at ±15 V - guarantees <1 LSB error in 16-bit DAC I-to-V conversion with 6 kΩ feedback resistor (VOS + IB·RS < 1 LSB). |
| Input Noise | 5 nV/√Hz voltage noise + 0.6 pA/√Hz current noise - total input noise minimized for RS = 1 kΩ–20 kΩ, matching typical DAC and sensor interface impedances. |
| Supply Range | ±5 V to ±15 V - supports dual-rail operation across industrial and test equipment power domains without performance degradation. |
| Operating Temp | –40°C to +85°C - qualified for extended temperature industrial environments, unlike commercial-grade LT1468C variants. |
Pinout & Package
LT1468AIDD#PBF uses an 8-lead (3 mm × 3 mm) plastic DFN package with exposed thermal pad internally connected to V–. Pin 8 (NULL) is factory-trimmed and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NULL) | Factory trim terminal | Unused; no external connection permitted - internal trimming of inverting input bias current only. |
| 2 (–IN) | Inverting input | High-impedance node with trimmed bias current (≤±10 nA); optimized for I-to-V converter feedback networks. |
| 3 (+IN) | Noninverting input | Untrimmed input with higher bias current variation; avoid balanced source resistors to preserve DC accuracy. |
| 4 (V–) | Negative supply | Connect to system ground or negative rail; exposed pad tied internally to V– for thermal conduction. |
| 5 (DNC*) | No-connect | Do not connect - reserved for internal test or calibration; floating per datasheet. |
| 6 (V+) | Positive supply | Accepts ±5 V to ±15 V; requires local 0.01 µF + 1 µF bypassing for stable high-frequency operation. |
| 7 (OUT) | Amplifier output | Capable of ±12.8 V swing into 2 kΩ; drives capacitive loads up to 300 pF in inverting configuration. |
| 8 (NULL) | Factory trim terminal | Unused; no external connection permitted - internal trimming of inverting input bias current only. |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit accurate settling | 900 ns to 150 µV (0.0023% of 10 V) enables direct interface with 16-bit DACs and ADCs without post-processing correction. |
| Input bias current cancellation | Inverting input bias current trimmed to ≤±10 nA at 0 V common mode - minimizes offset error in I-to-V converters with high-value feedback resistors. |
| Total input noise optimization | Minimum integrated noise achieved with source resistance 1 kΩ–20 kΩ - matches standard DAC output impedances and photodiode transimpedance ranges. |
| Low distortion at high frequency | –96.5 dB THD at 100 kHz, 10 VP-P - preserves signal fidelity in bandpass filtering and precision waveform generation up to audio frequencies. |
| Thermally enhanced DFN package | 3 mm × 3 mm DFN with exposed V– pad (θJA = 43°C/W) - sustains continuous operation at full output swing under industrial ambient conditions. |
Applications
| 16-Bit DAC I-to-V Conversion | Precision Instrumentation Amplifier |
|---|---|
Use Scenario: Converting current output from LTC1597 16-bit parallel DAC into precise voltage with minimal settling error and glitch energy. IC Role / Device Role / Timing Role: Primary current-to-voltage converter with gain-setting feedback network; settles within 900 ns to 150 µV ensuring monotonic 16-bit code transitions. Use Value: Eliminates need for external nulling circuitry while maintaining <1 LSB error over temperature due to 2 µV/°C VOS drift and trimmed IB–. | Use Scenario: Front-end gain stage in strain gauge or bridge sensor measurement system requiring high CMRR and low 1/f noise. IC Role / Device Role / Timing Role: First-stage in-amp driver with matched input impedance and low input bias current to prevent bridge imbalance errors. Use Value: 96 dB CMRR at ±12.5 V common mode and 0.3 µVP-P 0.1 Hz–10 Hz noise enable sub-µV-level DC resolution in static force measurement. |
| ADC Buffer for 16-Bit Sampling | Low-Distortion Active Filter |
Use Scenario: Driving sample-and-hold input of LTC1605 16-bit, 100 ksps ADC in high-precision data loggers. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-Z ADC input from driving source; provides fast settling (<1 µs) before acquisition window. Use Value: 22 V/µs slew rate and 90 MHz GBW ensure full-scale step response settles within ADC aperture time, preventing sampling error. | Use Scenario: 100 kHz bandpass filter stage in signal generator output cleanup circuits (e.g., HP3326A). IC Role / Device Role / Timing Role: High-linearity gain block in multiple-feedback topology; operates at AV = –1 with 5.1 kΩ resistors and 5 pF compensation. Use Value: –96.5 dB THD at 100 kHz enables clean spectral purity for metrology-grade sine wave generation without harmonic contamination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1469CS8#PBF | Dual-channel version; same 90 MHz GBW and 22 V/µs slew but higher supply current (6.5 mA/channel vs 5.2 mA). | Requires PCB redesign for dual-amplifier functions (e.g., differential driver + reference buffer); not pin-compatible. | Select when two matched 16-bit channels are needed in same footprint; verify thermal derating for dual-channel dissipation. |
| LTC6228IDC#PBF | Rail-to-rail output; lower slew rate (14 V/µs); wider supply range (2.8 V to 11.75 V single-ended); higher input bias current (±200 pA). | Optimized for low-voltage, battery-powered 16-bit systems; unsuitable for ±15 V industrial rails or DAC I-to-V with 6 kΩ feedback. | Prefer for portable instrumentation with 5 V or lower supplies; avoid where bipolar ±15 V operation or sub-µV offset is mandatory. |
Compared with LT1468AIDD#PBF, LT1469CS8#PBF offers channel density at the cost of layout complexity and power, while LTC6228IDC#PBF trades high-voltage capability and ultra-low offset for rail-to-rail flexibility and lower supply voltage support - neither is pin-compatible, and both require schematic and layout revision.
Availability
LT1468AIDD#PBF is available at Aetrix Electronics and suitable for industrial instrumentation, precision data acquisition, and high-fidelity signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for LT1468AIDD#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) designs high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement, industrial automation, and communications infrastructure.
The LT1468 product line was developed to bridge the gap between precision op amps and high-speed amplifiers, targeting 16-bit DAC/ADC interfaces where both nanovolt-level DC accuracy and sub-microsecond AC settling are simultaneously required.
FAQ
What is the maximum input offset voltage specification for LT1468AIDD#PBF over its full operating temperature range?
The LT1468AIDD#PBF has a maximum input offset voltage of 75 µV at ±15 V supply, tested and guaranteed over the full –40°C to +85°C temperature range. This value is confirmed in the "ELECTRICAL CHARACTERISTICS" table on page 3 of the datasheet under "LT1468A, DD Package" conditions, making it tighter than the standard LT1468DD variant (200 µV max) and suitable for 16-bit applications where offset drift must be minimized.
Can LT1468AIDD#PBF drive a 300 pF capacitive load in inverting configuration without oscillation?
Yes, the LT1468AIDD#PBF is specified to drive up to 300 pF in inverting configuration (AV = –1) without instability, as stated in the "Capacitive Loading" section on page 11. For reliable operation, use RF ≥ 10·RO and add a feedback capacitor CF = (2RO/RF)·CL; typical values are RF = 5.1 kΩ, CF = 5 pF, and CL = 300 pF. The LT1468AIDD#PBF's internal compensation and robust phase margin ensure stability under these conditions.
Why is Pin 8 (NULL) on LT1468AIDD#PBF required to remain unconnected?
Pin 8 on the LT1468AIDD#PBF is a factory-trim terminal used exclusively during production to null the inverting input bias current (IB–). It is not intended for user access or external circuitry. Connecting Pin 8 risks disrupting the calibrated bias cancellation, degrading DC accuracy and increasing offset drift. The datasheet explicitly states "DO NOT CONNECT" for this pin, and the LT1468AIDD#PBF's guaranteed IB– ≤ ±10 nA depends on leaving Pin 8 floating.
How does the LT1468AIDD#PBF achieve 16-bit settling performance in DAC I-to-V applications?
The LT1468AIDD#PBF achieves 16-bit settling via a combination of 22 V/µs slew rate, 90 MHz gain bandwidth, and optimized internal architecture that minimizes settling tail artifacts. In a typical LTC1597 DAC interface with 6 kΩ feedback and 20 pF compensation, the LT1468AIDD#PBF settles to 150 µV (0.0023% of 10 V) in 900 ns - well within the 1.33 µs theoretical RC limit for 16-bit resolution. This performance is validated using AN74 methodology and is intrinsic to the LT1468AIDD#PBF's single-stage design and thermal layout.
Is LT1468AIDD#PBF pin-compatible with other LT1468 variants in the DFN-8 package?
Yes, the LT1468AIDD#PBF shares identical pinout and footprint with all other LT1468xIDD variants (e.g., LT1468CIDD#PBF, LT1468IDD#PBF) in the 8-lead DFN package, as confirmed in the "PIN CONFIGURATION" diagram on page 2. All DFN versions use the same top-view pin numbering (1=NULL, 2=–IN, 3=+IN, 4=V–, 5=DNC, 6=V+, 7=OUT, 8=NULL) and mechanical outline (LTC DWG #05-08-1698 Rev C), enabling drop-in replacement within the same temperature grade family.
LT1468AIDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 22V/µs
- Gain Bandwidth Product:
- 90 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 3.9mA
- Current - Output / Channel:
- 22 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT1468AIDD#PBF FAQ
1.How can I place an order for LT1468AIDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1468AIDD#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 LT1468AIDD#PBF reliable?
The price and inventory of LT1468AIDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1468AIDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1468AIDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1468AIDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1468AIDD#PBF?
LT1468AIDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1468AIDD#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 LT1468AIDD#PBF?
For technical support, including LT1468AIDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1468AIDD#PBF requirements.
6.How does Aetrix verify that LT1468AIDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1468AIDD#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 LT1468AIDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1468AIDD#PBF?
All LT1468AIDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1468AIDD#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 LT1468AIDD#PBF part is unused and in its original packaging.
Return procedure for LT1468AIDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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