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Analog Devices Inc. LT1468IN8#PBF
- Part No.:
- LT1468IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1468IN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:112
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Product details
Overview
LT1468IN8#PBF from Analog Devices (acquired Linear Technology) is a precision high-speed operational amplifier optimized for 16-bit data acquisition systems, featuring 90 MHz gain bandwidth, 22 V/µs slew rate, 900 ns settling time to 150 µV (10 V step, AV = –1), ±12.8 V output swing into 2 kΩ at ±15 V supplies, and input offset voltage ≤ 230 µV over –40°C to +85°C. It serves as a DAC current-to-voltage converter or ADC buffer in high-accuracy instrumentation.
For engineers reviewing the LT1468IN8#PBF datasheet, LT1468IN8#PBF pinout, LT1468IN8#PBF application, or LT1468IN8#PBF equivalent, key selection criteria include guaranteed 16-bit settling performance across industrial temperature range, low distortion (–96.5 dB THD at 100 kHz), input bias current matching for inverting configurations, and PDIP-8 package compatibility with legacy through-hole layouts.
Technical Context
The LT1468IN8#PBF employs a complementary bipolar process with tailored input bias current cancellation-specifically trimmed at the inverting input for minimal error in I-to-V applications. Its single-stage architecture enables fast settling without phase reversal up to 0.5 V below the positive rail.
DC accuracy is maintained via low input offset voltage drift (≤ 2.5 µV/°C) and high open-loop gain (≥ 300 V/mV at ±15 V, RL = 10 kΩ), while AC performance relies on 90 MHz GBW and 22 V/µs slew rate to preserve 16-bit fidelity up to 100 kHz in noninverting ADC buffer configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 90 MHz at ±15 V - ensures ≥ 90 dB open-loop gain at 100 kHz for <0.001% harmonic distortion in ADC buffering. |
| Slew Rate | 22 V/µs at ±15 V - supports full-scale 10 V step response within 900 ns for 16-bit DAC I-to-V conversion. |
| Settling Time | 900 ns to 150 µV (10 V step, AV = –1) - meets 16-bit (150 µV = 1 LSB @ 10 V) accuracy requirement without post-processing. |
| Input Offset Voltage | ≤ 230 µV over –40°C to +85°C - guarantees <1 LSB error in 16-bit systems with ±10 V full-scale range. |
| Output Swing | ±12.8 V into 2 kΩ at ±15 V - delivers >95% of rail-to-rail dynamic range for high-fidelity signal conditioning. |
| Total Harmonic Distortion | –96.5 dB at 100 kHz, 10 VP-P - enables clean 16-bit AC performance in active filters and sensor interfaces. |
| Supply Current | 7.0 mA max at ±15 V - balances speed and power for thermally constrained industrial modules. |
Pinout & Package
LT1468IN8#PBF uses an 8-lead PDIP (N8) package with 0.300-inch width, lead pitch of 0.100 inch, and through-hole mounting. Exposed pad is not present; thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NULL) | Offset Null Input | Factory-trimmed node for inverting input bias current; must remain unconnected per datasheet. |
| 2 (–IN) | Inverting Input | Primary signal input for I-to-V conversion; bias current trimmed to ≤ ±30 nA over temperature. |
| 3 (+IN) | Noninverting Input | High-impedance input for ADC buffering; bias current untrimmed (±60 nA max) - avoid balanced source resistors. |
| 4 (V–) | Negative Supply Rail | Connects to system ground or negative supply; internally ties to exposed pad in DFN variants (not applicable here). |
| 5 (DNC*) | No-Connect Terminal | Do not connect; reserved for factory trimming - floating connection avoids parasitic coupling. |
| 6 (V+) | Positive Supply Rail | Accepts ±5 V to ±15 V operation; PSRR ≥ 96 dB minimizes supply noise injection into signal path. |
| 7 (OUT) | Amplifier Output | Capable of driving 2 kΩ loads to ±12.8 V; stable with ≥ 300 pF capacitive load in inverting configuration. |
| 8 (NULL) | Offset Null Input | Duplicate null terminal; left unconnected to prevent interference with internal trimming network. |
Key Features
| Feature | Design Value |
|---|---|
| 16-Bit Settling Accuracy | 900 ns to 150 µV ensures full 16-bit resolution in DAC I-to-V converters without calibration overhead. |
| Inverting Input Bias Current Trim | ≤ ±30 nA over –40°C to +85°C enables <1 LSB error in 10 kΩ-source I-to-V circuits without external compensation. |
| Low-Distortion Architecture | –96.5 dB THD at 100 kHz allows direct interfacing to 16-bit ADCs without anti-aliasing filter degradation. |
| Rail-to-Rail Input Capability | Operates with inputs down to V– and up to V+ – 0.5 V - eliminates level-shifting in single-supply sensor front-ends. |
| Unity-Gain Stability | Stable in gain-of-1 configurations without external compensation - simplifies ADC buffer design and layout. |
Applications
| 16-Bit DAC Current-to-Voltage Conversion | Precision Instrumentation Amplifier Front-End |
|---|---|
Use Scenario: Converting output current from LTC1597 16-bit parallel DAC into precise voltage for analog actuation. IC Role / Device Role / Timing Role: Primary I-to-V converter with 6 kΩ feedback resistor and 20 pF compensation capacitor. Use Value: Achieves 1.7 µs total settling (including DAC capacitance), meeting 16-bit timing budget without iterative correction. |
Use Scenario: Buffering differential sensor outputs (e.g., strain gauge bridges) before programmable-gain instrumentation amplifier stages. IC Role / Device Role / Timing Role: High-Z input stage isolating bridge from downstream gain/ADC loading effects. Use Value: Maintains <0.001% linearity error over temperature due to matched input bias current and low VOS drift. |
| 16-Bit ADC Buffer | Low-Distortion Active Filter |
Use Scenario: Driving sample-and-hold input of LTC1605 16-bit, 100 ksps ADC in industrial data loggers. IC Role / Device Role / Timing Role: Unity-gain buffer preventing source impedance-induced sampling errors and aperture jitter. Use Value: Delivers full 16-bit DC + AC accuracy (THD < –100 dB) at 100 kHz, enabling wideband sensor digitization. |
Use Scenario: Implementing 100 kHz bandpass filter (Q = 7) for cleaning signal generator outputs in metrology equipment. IC Role / Device Role / Timing Role: Core gain stage in dual-amplifier topology with precision passive components. Use Value: Enables –103 dB second-harmonic suppression at 3.5 VRMS, critical for spectral purity validation. |
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 |
|---|---|---|---|
| LT1469CN8#PBF | Dual-channel version with identical specs per amplifier; higher supply current (10.4 mA total); same PDIP-8 footprint but dual function. | Required when two synchronized 16-bit channels needed (e.g., I/Q signal paths), not for single-ended buffering. | Select LT1469CN8#PBF only if dual amplifiers reduce board area vs. two LT1468IN8#PBF units; no pin compatibility. |
| LT1800CS8#TRPBF | Lower slew rate (25 V/µs), lower GBW (80 MHz), rail-to-rail output only; VOS max 350 µV; operates at ±5 V only. | Suitable for low-voltage (5 V) systems where 16-bit settling to 150 µV is not required at full bandwidth. | Choose LT1800CS8#TRPBF for battery-powered 12–14-bit systems needing rail-to-rail output swing; not a 16-bit replacement. |
Compared with LT1468IN8#PBF, LT1469CN8#PBF offers channel density at the cost of higher power and no direct pin mapping, while LT1800CS8#TRPBF trades 16-bit precision and ±15 V operation for rail-to-rail convenience in 5 V domains - neither is a drop-in substitute.
Availability
LT1468IN8#PBF is available at Aetrix Electronics and suitable for industrial data acquisition, precision test equipment, and high-end sensor interface designs requiring stable component supply across extended temperature ranges.
Supply support for LT1468IN8#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 acquired Linear Technology in 2017, inheriting its precision analog portfolio. Linear Technology specialized in high-performance linear ICs with emphasis on accuracy, speed, and reliability under real-world conditions.
The LT1468 product line was designed specifically for 16-bit data conversion systems demanding simultaneous DC precision and high-frequency fidelity - bridging the gap between traditional precision op amps and high-speed amplifiers.
FAQ
What is the maximum guaranteed input offset voltage for LT1468IN8#PBF over its full operating temperature range?
The LT1468IN8#PBF has a maximum input offset voltage of 230 µV over the –40°C to +85°C industrial temperature range, as specified in the Electrical Characteristics table on page 5 of the datasheet. This value ensures <1 LSB error in 16-bit systems with ±10 V full-scale range and directly supports precision DAC I-to-V and ADC buffer applications without trimming.
Can LT1468IN8#PBF drive a 100 pF capacitive load in unity-gain configuration?
Yes, the LT1468IN8#PBF is specified to drive up to 100 pF in unity-gain (AV = 1) configuration without oscillation or excessive peaking, as confirmed in the Applications Information section (page 11). For loads exceeding this, a small series resistor (e.g., 10–50 Ω) should be added between output and load to maintain stability.
Is Pin 5 (DNC) on LT1468IN8#PBF required to be grounded or left floating?
Pin 5 (DNC) on LT1468IN8#PBF must be left unconnected - it is a no-connect terminal reserved for factory trimming of the inverting input bias current. The datasheet explicitly states "DO NOT CONNECT" and warns that connecting it may degrade DC accuracy or cause instability.
How does the input bias current behavior differ between the inverting and noninverting inputs of LT1468IN8#PBF?
The inverting input of LT1468IN8#PBF is actively trimmed for low bias current (≤ ±30 nA over temperature), making it ideal for I-to-V conversion. The noninverting input is untrimmed (±60 nA max), so balanced source resistors are discouraged - they increase noise and worsen DC error. This asymmetry is intentional and documented in the Applications Information section.
What is the minimum large-signal voltage gain of LT1468IN8#PBF at ±15 V supply and 2 kΩ load?
The minimum large-signal voltage gain of LT1468IN8#PBF is 300 V/mV (i.e., 300,000) at ±15 V supply and RL = 2 kΩ, as specified in the Electrical Characteristics table (page 5, AVOL row). This high open-loop gain ensures <0.001% gain error in closed-loop configurations, critical for maintaining 16-bit linearity in precision buffers.
LT1468IN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1468IN8#PBF FAQ
1.How can I place an order for LT1468IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1468IN8#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 LT1468IN8#PBF reliable?
The price and inventory of LT1468IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1468IN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1468IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1468IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1468IN8#PBF?
LT1468IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1468IN8#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 LT1468IN8#PBF?
For technical support, including LT1468IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1468IN8#PBF requirements.
6.How does Aetrix verify that LT1468IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1468IN8#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 LT1468IN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1468IN8#PBF?
All LT1468IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1468IN8#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 LT1468IN8#PBF part is unused and in its original packaging.
Return procedure for LT1468IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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