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Analog Devices Inc. LT1468CN8#PBF
- Part No.:
- LT1468CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1468CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:298
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Product details
Overview
LT1468CN8#PBF from Analog Devices (formerly 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, and 900 ns settling time 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 buffer applications requiring simultaneous DC accuracy and AC fidelity.
For engineers reviewing the LT1468CN8#PBF datasheet, LT1468CN8#PBF pinout, LT1468CN8#PBF application, or LT1468CN8#PBF equivalent, this page delivers verified specifications, package-validated pin functions, real-world settling and distortion performance, and direct alternatives for 16-bit I-to-V, ADC buffering, instrumentation, and active filter designs.
Technical Context
The LT1468CN8#PBF employs a complementary bipolar process to achieve unity-gain stability with 90 MHz GBW at ±15 V supply, enabling >100 dB open-loop gain at 100 kHz for distortion reduction. Its single-stage architecture and optimized thermal layout deliver 900 ns settling to 150 µV under AV = –1, critical for fast 16-bit DAC output conditioning.
Input stage bias current cancellation targets inverting configurations: the inverting input is factory-trimmed for near-zero bias current at 0 V common-mode, while the noninverting input exhibits higher variation-making balanced source resistances detrimental to DC accuracy and noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 90 MHz at ±15 V - ensures ≥100 dB loop gain at 100 kHz, reducing harmonic distortion in precision signal chains. |
| Slew Rate | 22 V/µs at ±15 V - enables full-scale 10 V step response within 455 ns, supporting high-fidelity active filters and instrumentation amplifiers. |
| Settling Time | 900 ns to 150 µV (10 V step, AV = –1) - meets 16-bit (150 µV = 1 LSB @ 10 V) settling requirements without post-amplifier correction. |
| Input Offset Voltage | 75 µV max (±15 V, N8 package) - guarantees <0.75 LSB error at 10 V full scale for 16-bit systems. |
| Input Noise Density | 5 nV/√Hz at 10 kHz - dominates total noise for source impedances <1 kΩ, preserving SNR in low-Z sensor interfaces. |
| DC Open-Loop Gain | 1000 V/mV min into 2 kΩ - maintains <0.01% gain error at 100 kHz in noninverting ADC buffers. |
| Total Harmonic Distortion | –96.5 dB at 100 kHz, 10 VP-P - supports clean 16-bit AC performance up to audio band without spectral contamination. |
Pinout & Package
LT1468CN8#PBF uses an 8-lead PDIP (Plastic Dual In-line Package) with 0.300-inch width, rated for 0°C to 70°C operation. The exposed pad is absent; thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NULL) | Factory trim terminal | No connection required; used internally for inverting input bias current calibration - floating or tied to ground degrades DC accuracy. |
| 2 (–IN) | Inverting input | Primary signal input for I-to-V conversion; bias current trimmed to ≤10 nA at 0 V CM, minimizing offset in DAC feedback paths. |
| 3 (+IN) | Noninverting input | Untrimmed input with ±40 nA max bias current; avoid matched source resistors to prevent added offset and noise. |
| 4 (V–) | Negative supply | Accepts –15 V to –5 V; input common-mode extends to V–, enabling rail-to-rail input below ground in single-supply configurations with level shift. |
| 5 (DNC*) | Do-not-connect | Internally unused; must remain unconnected per datasheet - any connection risks parametric shift or instability. |
| 6 (V+) | Positive supply | Accepts +5 V to +15 V; input common-mode extends to within 0.5 V of V+, limiting max undistorted input swing to V+ – 0.5 V. |
| 7 (OUT) | Amplifier output | Drives ≥±12.8 V into 2 kΩ; supports capacitive loads up to 100 pF (unity gain) or 300 pF (AV = –1) with optional series resistor compensation. |
| 8 (NULL) | Factory trim terminal | Identical function to Pin 1 - no external connection; PCB layout must isolate both NULL pins from traces and ground planes. |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit settling performance | 900 ns to 150 µV ensures full 16-bit resolution in DAC I-to-V converters without iterative correction or external settling monitors. |
| Optimized inverting-input bias | ≤10 nA max at VCM = 0 V enables sub-LSB accuracy in 16-bit current-output DAC interfaces with 6 kΩ feedback resistors. |
| Low THD at high frequency | –96.5 dB at 100 kHz allows use in 16-bit, 100 ksps data acquisition front-ends without harmonic folding or post-processing filtering. |
| Unity-gain stable architecture | Eliminates need for external compensation in gain-of-1 ADC buffers, reducing BOM count and layout sensitivity in space-constrained systems. |
| Total input noise optimization | Minimum integrated noise occurs with 1 kΩ < RS < 20 kΩ - matches typical DAC output impedance and photodiode transimpedance ranges. |
Applications
| 16-Bit DAC Current-to-Voltage Converter | Precision Instrumentation Amplifier |
|---|---|
Use Scenario: Converting output current from LTC1597 16-bit parallel DAC into precise voltage with minimal settling error and glitch energy. IC Role / Device Role / Timing Role: Primary I-to-V converter with 6 kΩ feedback and 20 pF compensation capacitor; settles 10 V step in 1.7 µs including DAC capacitance effects. Use Value: Achieves <1 LSB error at 16-bit resolution without post-settling delay, enabling maximum throughput in closed-loop control systems. | Use Scenario: Building a three-op-amp instrumentation amplifier (e.g., LT1167 reference design) where the LT1468CN8#PBF serves as the output stage. IC Role / Device Role / Timing Role: High-speed, low-drift output buffer delivering ±12.8 V swing into 2 kΩ load while maintaining 90 MHz GBW for wideband common-mode rejection. Use Value: Enables >100 dB CMRR at 10 kHz and preserves 16-bit linearity across temperature due to 2 µV/°C VOS drift. |
| ADC Buffer for 16-Bit Sampling | Low-Distortion Active Filter |
Use Scenario: Driving LTC1605 16-bit, 100 ksps ADC input with ±10 V analog signals while isolating sample-and-hold from high source impedance. IC Role / Device Role / Timing Role: Noninverting unity-gain buffer with 100% DC accuracy and –96.5 dB THD at 100 kHz, ensuring SINAD > 90 dB at full scale. Use Value: Eliminates sampling-rate degradation caused by source impedance loading, sustaining 100 ksps sustained throughput with 16-bit fidelity. | Use Scenario: Implementing a 100 kHz bandpass filter (e.g., TA05 schematic) for cleaning signal generator outputs prior to precision test equipment. IC Role / Device Role / Timing Role: Core gain stage in second-order topology with Q = 7 and fO = 100 kHz; delivers –96.5 dB third-harmonic distortion at 3.5 VRMS. Use Value: Maintains <0.0015% THD across full 100 kHz passband, enabling metrology-grade spectral purity without external notch filtering. |
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; 8 mA supply current vs 5.2 mA for LT1468CN8#PBF. | Required when two synchronized 16-bit I-to-V channels are needed (e.g., differential DAC outputs); not suitable for single-channel space-constrained layouts. | Select LT1469CN8#PBF only when dual-channel functionality justifies 60% higher quiescent power and larger PCB footprint. |
| LTC6090CS8#PBF | Higher supply range (±13.5 V), lower input bias current (±3 pA), but slower GBW (27 MHz) and longer settling (1.8 µs to 0.01%). | Better for ultra-high-impedance photodiode amps (>1 GΩ feedback); unsuitable for 100 kHz DAC settling or 16-bit ADC buffering due to bandwidth limitation. | Choose LTC6090CS8#PBF for femtoamp-level sensor interfaces where speed is secondary to input leakage; avoid for time-critical 16-bit acquisition. |
Compared with LT1469CN8#PBF and LTC6090CS8#PBF, the LT1468CN8#PBF uniquely balances 90 MHz bandwidth, 900 ns 16-bit settling, and 75 µV VOS in a single-channel PDIP package-making it the only option that satisfies simultaneous 100 kHz distortion, 16-bit settling, and cost-sensitive prototyping requirements.
Availability
LT1468CN8#PBF is available at Aetrix Electronics and suitable for 16-bit DAC current-to-voltage conversion, precision ADC buffering, and low-distortion active filter designs requiring stable component supply across industrial, test & measurement, and medical instrumentation programs.
Supply support for LT1468CN8#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 ICs, serving precision instrumentation, communications, and industrial markets.
The LT1468CN8#PBF belongs to Linear Technology's precision high-speed op amp product line, engineered specifically to bridge the gap between traditional precision op amps and high-speed amplifiers-enabling true 16-bit DC + AC performance in data acquisition, automated test equipment, and medical imaging front-ends.
FAQ
What is the maximum operating temperature range for the LT1468CN8#PBF?
The LT1468CN8#PBF is specified for 0°C to 70°C operation. It is part of the 'C' grade variant, which is characterized and guaranteed over this commercial temperature range. For extended industrial operation (–40°C to 85°C), the LT1468IN8#PBF should be selected instead.
Does the LT1468CN8#PBF require external nulling circuitry?
No, the LT1468CN8#PBF does not require external nulling. Its input offset voltage is trimmed at the factory, and the NULL pins (1 and 8) are reserved for internal inverting-input bias current calibration. Connecting them externally degrades performance-both pins must remain unconnected per the datasheet.
Can the LT1468CN8#PBF drive a 1000 pF capacitive load?
No, the LT1468CN8#PBF cannot directly drive 1000 pF. It supports up to 100 pF in unity gain and 300 pF in inverting gain (AV = –1). To drive larger loads like 1000 pF, a small series resistor (e.g., 20–50 Ω) must be placed between the LT1468CN8#PBF output and the load, along with a feedback capacitor (CF) calculated per the formula CF = (2RO/RF)CL.
How does the LT1468CN8#PBF compare to the LT1468ACDD#PBF in terms of input offset voltage?
The LT1468CN8#PBF has a maximum input offset voltage of 75 µV at ±15 V, while the LT1468ACDD#PBF ('A' grade, DFN package) specifies 75 µV max under identical conditions. Both meet the same precision threshold, but the LT1468CN8#PBF offers through-hole PDIP compatibility for prototyping, whereas the LT1468ACDD#PBF provides 3 mm × 3 mm DFN for space-constrained PCBs.
Is the LT1468CN8#PBF unity-gain stable?
Yes, the LT1468CN8#PBF is unity-gain stable. Its internal compensation ensures stable operation with closed-loop gains ≥1, eliminating the need for external compensation components in noninverting buffer or gain-of-1 configurations-critical for reliable ADC input buffering and reference voltage followers.
LT1468CN8#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:
- -
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1468CN8#PBF FAQ
1.How can I place an order for LT1468CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1468CN8#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 LT1468CN8#PBF reliable?
The price and inventory of LT1468CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1468CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1468CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1468CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1468CN8#PBF?
LT1468CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1468CN8#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 LT1468CN8#PBF?
For technical support, including LT1468CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1468CN8#PBF requirements.
6.How does Aetrix verify that LT1468CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1468CN8#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 LT1468CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1468CN8#PBF?
All LT1468CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1468CN8#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 LT1468CN8#PBF part is unused and in its original packaging.
Return procedure for LT1468CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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