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Analog Devices Inc. LT1468CS8-2#PBF
- Part No.:
- LT1468CS8-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1468CS8-2#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,674
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Product details
Overview
LT1468CS8-2#PBF from Analog Devices (acquired Linear Technology) is a decompensated precision high-speed operational amplifier optimized for gain ≥ 2 configurations, delivering 200MHz gain bandwidth, 30V/µs slew rate, and ≤75µV max input offset voltage at ±15V supplies. It enables 16-bit DC+AC performance in DAC current-to-voltage conversion and ADC buffer circuits across –40°C to 85°C.
For engineers reviewing the LT1468CS8-2#PBF datasheet, LT1468CS8-2#PBF pinout, LT1468CS8-2#PBF application, or LT1468CS8-2#PBF equivalent, key selection criteria include its AV ≥ 2 stability requirement, 800ns settling time to 150µV, low 5nV/√Hz input voltage noise, and SO-8 package compatibility with precision data acquisition layouts.
Technical Context
The LT1468CS8-2#PBF uses a decompensated two-stage transconductance amplifier architecture with bias current cancellation at the inverting input, tailored for inverting applications like DAC I-to-V conversion. Its open-loop gain exceeds 1000 V/mV into 2kΩ at ±15V, and gain-bandwidth remains ≥200MHz at 100kHz test frequency.
Stability requires closed-loop gain ≥2 (AV = –1 or ≥2 noninverting), enforced by reduced internal compensation capacitance. Input stage protection includes 100Ω series resistors and back-to-back diodes per input, with ESD clamps to both supplies-limiting input current to 10mA under overvoltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 200MHz at ±15V - ensures ≥80dB open-loop gain at 100kHz for distortion reduction in 16-bit systems |
| Slew Rate | 30V/µs at ±15V - supports full-scale 10V step settling in <1µs without slewing-induced distortion |
| Input Offset Voltage | ≤75µV max at ±15V - enables <1LSB error in 16-bit DAC I-to-V converters with 6kΩ feedback |
| Settling Time | 800ns to 150µV for 10V step - meets timing budget for 1MSPS+ data acquisition with 16-bit accuracy |
| Input Voltage Noise | 5nV/√Hz at 10kHz - dominates total noise for source impedances <1kΩ, critical for low-noise sensor interfaces |
| Common-Mode Rejection | ≥96dB at ±12.5V CM - maintains DC accuracy when driving from single-ended sources in noisy industrial environments |
| Output Swing | ±12.8V into 2kΩ at ±15V - delivers rail-to-rail usable dynamic range for ±12V signal chains |
| Supply Current | 5.2mA max at ±15V - balances speed and power for battery-sensitive portable instrumentation |
Pinout & Package
LT1468CS8-2#PBF is housed in an 8-lead plastic SO (Small Outline) package, 0.150" wide, with exposed pad not connected internally. Pin 1 is marked by bevel or dimple; Pin 8 is factory-trim only and must remain unconnected in circuit.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NULL) | Null offset adjustment terminal | Unused in standard operation; no external connection required |
| 2 (–IN) | Inverting input | Bias current trimmed near zero at VCM = 0V for minimal error in I-to-V applications |
| 3 (+IN) | Noninverting input | Untrimmed bias current; avoid balanced source resistors to prevent DC accuracy degradation |
| 4 (V–) | Negative supply | Internally connects to exposed pad in DFN variants; ground plane recommended beneath SO-8 thermal pad |
| 5 (DNC*) | Do-not-connect terminal | Factory trim point for inverting input current; must float, not tied to any net |
| 6 (V+) | Positive supply | Accepts ±5V or ±15V dual supplies; bypass with 0.01µF RF + 1µF tantalum per supply pin |
| 7 (OUT) | Amplifier output | Capable of ±12.8V swing into 2kΩ; drives 500Ω loads with <1% THD up to 100kHz |
| 8 (NULL) | Null offset adjustment terminal | Unused; leave unconnected - not a ground or supply tie point |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit DC + AC accuracy | Combines ≤75µV VOS, ≤2µV/°C drift, and –96.5dB THD @100kHz for simultaneous precision and speed |
| Optimized total input noise | Minimum integrated noise achieved with 1kΩ < RS < 20kΩ source resistance - ideal for photodiode and DAC interfaces |
| Gain ≥2 stability | Decompensated design enables 200MHz GBW while maintaining phase margin >60° at AV = –1 |
| Input bias current cancellation | Inverting input IB– trimmed to ±10nA max - reduces offset error in current-sensing applications |
| Robust input protection | 100Ω series resistors + back-to-back diodes + ESD clamps allow safe operation with ±0.7V differential or ±36V total supply stress |
Applications
| 16-Bit DAC I-to-V Converter | Precision Instrumentation |
|---|---|
Use Scenario: Converting 16-bit current-output DAC (e.g., LTC1597) output to precise voltage with <1LSB error. IC Role / Device Role / Timing Role: High-gain, low-drift transimpedance amplifier with 6kΩ feedback resistor and 20pF DAC output capacitance compensation. Use Value: Achieves 1.6µs settling to 150µV via pole-zero cancellation, enabling 1MSPS+ update rates without missing codes. | Use Scenario: Front-end amplification in strain-gauge or RTD measurement bridges requiring µV-level resolution. IC Role / Device Role / Timing Role: Low-noise, high-CMRR inverting amplifier with guarded input traces and matched layout. Use Value: 5nV/√Hz voltage noise and ≥96dB CMRR suppress thermal EMF and common-mode interference in 4-wire sensing. |
| ADC Buffer | Low Distortion Active Filters |
Use Scenario: Driving SAR or sigma-delta ADC inputs (e.g., LTC1605) with full-scale ±12V signals. IC Role / Device Role / Timing Role: Noninverting unity-gain follower with 2kΩ feedback and 22pF noise filter capacitor. Use Value: Delivers 16-bit AC+DC linearity via 800ns settling and –96.5dB THD, eliminating aperture uncertainty in sampling. | Use Scenario: Implementing 4th-order Butterworth anti-aliasing filters before 16-bit ADCs in data loggers. IC Role / Device Role / Timing Role: High-slew-rate gain stage in multiple-feedback topology with 2kΩ/22pF network. Use Value: Maintains <0.01% passband flatness to 100kHz due to 200MHz GBW, preventing aliasing-induced SNR loss. |
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 |
|---|---|---|---|
| LT1468IS8-2#PBF | Identical electrical specs; rated for –40°C to 85°C industrial temp range vs. LT1468CS8-2#PBF's 0°C to 70°C | Required for extended temperature deployments (e.g., outdoor instrumentation, automotive under-hood) | Select LT1468IS8-2#PBF when operating outside 0°C–70°C ambient; same PCB layout and schematic |
| LT1469-2#PBF | Dual-channel version with identical per-amplifier specs (200MHz GBW, 30V/µs, 75µV VOS), 14-lead SO package | Reduces board space and BOM count in multi-channel systems (e.g., multi-sensor DAQ, stereo audio) | Choose LT1469-2#PBF for dual-channel needs; verify layout clearance for 14-pin SO footprint |
Compared with LT1468IS8-2#PBF and LT1469-2#PBF, the LT1468CS8-2#PBF offers cost-optimized single-channel performance for commercial-temperature 16-bit data acquisition, with identical AC/DC specs but narrower thermal qualification and no channel duplication.
Availability
LT1468CS8-2#PBF is available at Aetrix Electronics and suitable for 16-bit DAC I-to-V conversion, precision instrumentation front-ends, and ADC buffering requiring stable component supply across industrial and test equipment programs.
Supply support for LT1468CS8-2#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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1468-2 product line was designed by Linear Technology specifically for high-accuracy, high-speed signal conditioning in 16-bit data conversion systems-prioritizing simultaneous DC precision, AC fidelity, and gain-stable operation.
FAQ
What is the minimum stable gain for LT1468CS8-2#PBF?
The LT1468CS8-2#PBF is decompensated and requires a closed-loop gain of ≥2 (AV = –1 or AV ≥ 2 noninverting) for stability. This is enforced by reduced internal compensation capacitance. Attempting unity-gain operation may cause peaking or oscillation. For unity-gain stable alternatives, refer to the LT1468 datasheet.
Can LT1468CS8-2#PBF drive heavy capacitive loads?
The LT1468CS8-2#PBF is not optimized for direct capacitive loading >100pF. For DAC output capacitance (e.g., 20pF), use feedback compensation (CF = RG × CIN / RF). Driving >500pF loads requires isolation resistors or external buffer stages to maintain phase margin and prevent ringing.
What is the purpose of Pin 5 (DNC*) on LT1468CS8-2#PBF?
Pin 5 on LT1468CS8-2#PBF is labeled DNC* (Do Not Connect) and serves as a factory trim point for inverting input bias current. It must remain unconnected in all circuit designs-no grounding, pulling, or routing is permitted, as it is not electrically functional in end-user applications.
How does LT1468CS8-2#PBF achieve 16-bit accuracy in DAC I-to-V applications?
The LT1468CS8-2#PBF achieves 16-bit accuracy in DAC I-to-V applications via ≤75µV max input offset voltage, ≤2µV/°C drift, and inverting-input bias current trimmed to ±10nA. With a 6kΩ feedback resistor, total offset error stays below 1LSB (≈150µV) across temperature, as confirmed in the typical application circuit (TA01).
Is LT1468CS8-2#PBF compatible with ±5V supplies?
Yes, LT1468CS8-2#PBF is fully specified for ±5V operation: slew rate is 22V/µs (min), gain bandwidth is 190MHz (typ), and output swing reaches ±2.8V into 2kΩ. All key DC parameters-including input offset voltage and CMRR-are guaranteed across ±5V to ±15V supply ranges per the datasheet.
LT1468CS8-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 30V/µs
- Gain Bandwidth Product:
- 200 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1468CS8-2#PBF FAQ
1.How can I place an order for LT1468CS8-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1468CS8-2#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 LT1468CS8-2#PBF reliable?
The price and inventory of LT1468CS8-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1468CS8-2#PBF is usually 5 days.
3.What payment methods are accepted for LT1468CS8-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1468CS8-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1468CS8-2#PBF?
LT1468CS8-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1468CS8-2#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 LT1468CS8-2#PBF?
For technical support, including LT1468CS8-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1468CS8-2#PBF requirements.
6.How does Aetrix verify that LT1468CS8-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT1468CS8-2#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 LT1468CS8-2#PBF meets industry standards.
7.What is the process for return or replacement of LT1468CS8-2#PBF?
All LT1468CS8-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1468CS8-2#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 LT1468CS8-2#PBF part is unused and in its original packaging.
Return procedure for LT1468CS8-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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