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Analog Devices Inc. LT1468IDD#PBF
- Part No.:
- LT1468IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT1468IDD#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
LT1468IDD#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 to 150 µV for 10 V steps. Its tailored input offset voltage drift (2 µV/°C max) and low inverting input bias current (±10 nA max) make it ideal for DAC current-to-voltage conversion and ADC buffering in industrial instrumentation and precision test equipment.
For engineers reviewing the LT1468IDD#PBF datasheet, LT1468IDD#PBF pinout, LT1468IDD#PBF application, or LT1468IDD#PBF equivalent, key selection criteria include guaranteed ±40°C to +85°C operation, 8-lead 3 mm × 3 mm DFN package with exposed thermal pad, DC accuracy under inverting configurations, and full 16-bit AC/DC performance at 100 kHz without external compensation.
Technical Context
The LT1468IDD#PBF employs a complementary bipolar process to achieve simultaneous high DC precision and wideband AC performance. Its single-stage architecture enables fast settling (900 ns to 150 µV), while internal bias current cancellation minimizes errors in inverting applications like DAC I-to-V conversion.
It features unity-gain stability, operates from ±5 V to ±15 V supplies, and maintains low distortion (–96.5 dB THD at 100 kHz, 10 VP-P) and low noise (5 nV/√Hz input voltage noise, 0.6 pA/√Hz input current noise) across its specified temperature range.
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 low distortion in ADC buffer applications. |
| Slew Rate | 22 V/µs at ±15 V - supports full-scale 10 V step response within 450 ns, critical for active filter and instrumentation amplifier large-signal fidelity. |
| Settling Time | 900 ns to 150 µV (AV = –1, 10 V step) - enables 16-bit settling in high-speed DAC output stages without post-amplifier correction. |
| Input Offset Voltage | 75 µV max (±15 V) - guarantees <1 LSB error in 16-bit DAC I-to-V converters with 6 kΩ feedback resistor. |
| Input Bias Current (–IN) | ±10 nA max - minimized and trimmed for inverting configurations, reducing DC error in precision transimpedance amplifiers. |
| Output Swing | ±12.8 V into 2 kΩ (±15 V supply) - delivers rail-to-rail usable dynamic range for ±12 V signal chains in industrial analog front-ends. |
| Input Noise | 5 nV/√Hz voltage noise + 0.6 pA/√Hz current noise - total input noise optimized for source resistances between 1 kΩ and 20 kΩ. |
Pinout & Package
LT1468IDD#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 | Do not connect; used for inverting input bias current calibration during manufacturing. |
| 2 (–IN) | Inverting input | Low-bias-current node optimized for transimpedance and inverting gain configurations. |
| 3 (+IN) | Noninverting input | Untrimmed input; higher bias current variation - avoid balanced source resistance to preserve DC accuracy. |
| 4 (V–) | Negative supply | Internally connected to exposed thermal pad; requires low-impedance ground plane for thermal and noise performance. |
| 5 (DNC*) | No-connect | Not internally bonded; leave floating per datasheet - no routing or soldering required. |
| 6 (V+) | Positive supply | Accepts ±5 V to ±15 V; bypass with 0.01 µF ceramic + 1 µF tantalum for stable high-frequency operation. |
| 7 (OUT) | Amplifier output | Capable of driving ≥100 pF in unity gain and ≥300 pF in AV = –1; add series R + feedback C for larger loads. |
| 8 (NULL) | Factory trim terminal | Identical function to Pin 1; must remain unconnected to avoid degrading bias current specification. |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit accurate settling | 900 ns to 150 µV ensures full resolution in 100 ksps+ DAC output stages without iterative correction. |
| Inverting input bias current trim | ±10 nA max at ±15 V enables sub-µV error in 6 kΩ-feedback DAC I-to-V converters over temperature. |
| Optimized total input noise | Minimum integrated noise at RS = 1 kΩ–20 kΩ eliminates need for external noise filtering in photodiode and sensor interfaces. |
| Thermally enhanced DFN package | θJA = 43°C/W with exposed V– pad allows sustained 5.2 mA supply current operation at 85°C ambient without derating. |
| Stable with capacitive loads | Drives up to 300 pF at AV = –1 without oscillation - simplifies layout in ADC driver and anti-alias filter applications. |
Applications
| 16-Bit DAC I-to-V Converter | Precision Instrumentation Amplifier |
|---|---|
Use Scenario: Converting 16-bit current-output DAC (e.g., LTC1597) into precise voltage output for calibration-grade signal generation. IC Role / Device Role / Timing Role: Transimpedance amplifier with 6 kΩ feedback and 20 pF compensation, providing 1.7 µs 16-bit settling per AN74 methodology. Use Value: Eliminates need for secondary settling amplifiers; achieves <1 LSB error at 100 kHz with no nulling circuitry. | Use Scenario: Building high-common-mode-rejection (≥96 dB) differential gain stages for strain gauge or bridge sensor readout. IC Role / Device Role / Timing Role: Gain-setting stage in 3-op-amp instrumentation topology, leveraging low VOS drift and matched input bias for DC stability. Use Value: Maintains 16-bit linearity over –40°C to +85°C without recalibration; rejects 60 Hz interference at >100 dB. |
| ADC Buffer (16-Bit SAR) | Low-Distortion Active Filter |
Use Scenario: Driving the sample-and-hold input of 16-bit ADCs (e.g., LTC1605) with ±10 V full-scale range and 100 ksps sampling. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-Z ADC input from driving source impedance, preserving AC/DC accuracy. Use Value: Delivers –96.5 dB THD at 100 kHz, 10 VP-P, enabling full 16-bit SINAD without aperture jitter degradation. | Use Scenario: Implementing 100 kHz bandpass filters for signal generator cleanup or spectral analysis front-ends. IC Role / Device Role / Timing Role: High-Q active filter core (e.g., 1468 TA05) with Q = 7 and fO = 100 kHz, operating at ±15 V. Use Value: Achieves –103 dB second-harmonic distortion at 2 VRMS, supporting metrology-grade waveform purity. |
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; identical AC/DC specs per amplifier but higher supply current (6.5 mA per amp vs. 5.2 mA). | Requires PCB redesign for dual-channel use; unsuitable for space-constrained single-amplifier layouts. | Select when two matched 16-bit amplifiers are needed on one die - reduces inter-channel skew in synchronized acquisition. |
| LTC6228IDC#PBF | Higher GBW (410 MHz), lower noise (2.1 nV/√Hz), but only 12-bit settling (1.2 µs to 1 mV); not rated for 16-bit accuracy. | Cannot guarantee 150 µV settling; insufficient DC precision for DAC I-to-V or metrology ADC buffering. | Prefer for >10 MSPS signal chain front-ends where speed outweighs DC accuracy - not a drop-in replacement. |
Compared with LT1468IDD#PBF, LT1469CS8#PBF offers channel pairing at the cost of layout area and power, while LTC6228IDC#PBF trades verified 16-bit settling for raw bandwidth and noise - neither matches LT1468IDD#PBF's unique blend of guaranteed 16-bit settling, low bias current trim, and industrial temperature range in a 3 mm × 3 mm DFN.
Availability
LT1468IDD#PBF is available at Aetrix Electronics and suitable for precision data acquisition systems, industrial sensor signal conditioning, and high-fidelity test equipment requiring stable component supply across extended temperature ranges.
Supply support for LT1468IDD#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 specifically for 16-bit data converter interface applications, combining precision DC parameters with high-speed settling to eliminate system-level calibration and improve throughput in automated test equipment.
FAQ
What is the maximum operating temperature range for LT1468IDD#PBF?
The LT1468IDD#PBF is specified for continuous operation from –40°C to +85°C, with junction temperature limited to 150°C. This industrial temperature grade is confirmed in the Order Information table for the DD package variant and validated across all electrical characteristics in the –40°C to +85°C column of the Electrical Characteristics tables.
Does LT1468IDD#PBF require external nulling circuitry?
No, LT1468IDD#PBF does not require external nulling circuitry. Its input offset voltage and inverting input bias current are factory-trimmed, and the datasheet explicitly states "Make no connection to Pin 8" and advises removing nulling circuitry when replacing older op amps. External trimming would degrade the specified 75 µV VOS max.
Can LT1468IDD#PBF drive a 1000 pF capacitive load?
No, LT1468IDD#PBF cannot directly drive a 1000 pF load stably. It supports up to 100 pF in unity gain and 300 pF in AV = –1. For 1000 pF, the datasheet mandates adding a series resistor (RO ≥ (1 + RF/RG)/(2π·CL·5 MHz)) and a feedback capacitor (CF = (2RO/RF)·CL) per Figure 1468 AI04.
Is LT1468IDD#PBF pin-compatible with LT1468CS8#PBF?
No, LT1468IDD#PBF is not pin-compatible with LT1468CS8#PBF. The former uses an 8-lead 3 mm × 3 mm DFN (DD) package with exposed pad and specific pin 1 location, while the latter uses an 8-lead SOIC (S8) package with gull-wing leads and different mechanical footprint - requiring separate PCB layouts and rework tooling.
What is the typical supply current for LT1468IDD#PBF at ±15 V?
The typical supply current for LT1468IDD#PBF at ±15 V is 5.2 mA, as stated in the Electrical Characteristics table on page 4 of the datasheet under "IS Supply Current" at ±15 V. This value is measured across temperature and applies to the DD package variant including LT1468IDD#PBF.
LT1468IDD#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:
- 100 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)
LT1468IDD#PBF FAQ
1.How can I place an order for LT1468IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1468IDD#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 LT1468IDD#PBF reliable?
The price and inventory of LT1468IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1468IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1468IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1468IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1468IDD#PBF?
LT1468IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1468IDD#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 LT1468IDD#PBF?
For technical support, including LT1468IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1468IDD#PBF requirements.
6.How does Aetrix verify that LT1468IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1468IDD#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 LT1468IDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1468IDD#PBF?
All LT1468IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1468IDD#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 LT1468IDD#PBF part is unused and in its original packaging.
Return procedure for LT1468IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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