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Analog Devices Inc. LT1468CDD-2#PBF
- Part No.:
- LT1468CDD-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT1468CDD-2#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
LT1468CDD-2#PBF from Analog Devices (acquired Linear Technology) is a decompensated precision high-speed operational amplifier optimized for gain ≥ 2, delivering 16-bit DC accuracy with 200MHz gain bandwidth, 30V/µs slew rate, and 75µV max input offset voltage at ±15V supply. It serves as a current-to-voltage converter for 16-bit DACs and as an ADC buffer in high-fidelity data acquisition systems.
For engineers reviewing the LT1468CDD-2#PBF datasheet, LT1468CDD-2#PBF pinout, LT1468CDD-2#PBF application, or LT1468CDD-2#PBF equivalent, key selection criteria include its AV ≥ 2 stability requirement, DFN-8 (3mm × 3mm) package thermal performance, low 0.7–2.0µV/°C VOS drift, and verified settling time of 800ns to 150µV for 10V steps in inverting configuration.
Technical Context
The LT1468CDD-2#PBF uses a decompensated two-stage transconductance amplifier architecture with trimmed inverting input bias current (±10nA max), enabling stable operation only at closed-loop gains ≥ 2. Its input stage integrates 100Ω series resistors and back-to-back diodes for ESD protection and overvoltage clamping.
DC precision is achieved via laser-trimmed input offset voltage (75µV max) and matched transistor pairs that minimize common-mode-induced drift; AC performance relies on high open-loop gain (>1000 V/mV into 2kΩ) maintained up to 100kHz and optimized total input noise (5nV/√Hz voltage noise, 0.6pA/√Hz current noise) for source impedances between 1kΩ and 20kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 200MHz - ensures ≥60dB open-loop gain at 100kHz for distortion reduction in 16-bit signal chains |
| Slew Rate | 30V/µs - supports full-scale 10V step response within 333ns, critical for fast-settling DAC I-to-V conversion |
| Input Offset Voltage | 75µV max (±15V, 0°C to 70°C) - enables <1LSB error in 16-bit systems with 6kΩ feedback resistor |
| Settling Time | 800ns to 150µV (10V step, AV = –1) - meets timing budget for 1MSPS+ data acquisition with 16-bit accuracy |
| Input Noise Density | 5nV/√Hz + 0.6pA/√Hz - total input noise minimized for 1kΩ–20kΩ source impedances, matching photodiode and DAC output Z |
| Supply Voltage Range | ±5V to ±15V - supports dual-rail industrial and test equipment power domains without level-shifting |
| Operating Temperature | 0°C to 70°C - specified performance guaranteed across commercial temperature range for embedded instrumentation |
Pinout & Package
LT1468CDD-2#PBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with exposed pad internally connected to V–. Thermal resistance θJA = 43°C/W enables high-power-density PCB layouts without external heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NULL) | Factory trim terminal | No connection required; used during production for inverting input bias current calibration |
| 2 (–IN) | Inverting input | Laser-trimmed for minimal IB– (±10nA max); bias current cancellation optimized for I-to-V applications |
| 3 (+IN) | Noninverting input | Untrimmed; higher IB+ variation (±40nA max); avoid balanced source resistors to preserve DC accuracy |
| 4 (V–) | Negative supply | Internally tied to exposed thermal pad; must be soldered to PCB ground plane for thermal and electrical integrity |
| 5 (DNC*) | Do not connect | Reserved internal node; floating connection prevents instability or parametric shift |
| 6 (V+) | Positive supply | Accepts ±5V to ±15V; PSRR >98dB minimizes supply ripple coupling into high-gain signal paths |
| 7 (OUT) | Output | Drives ≥±12.8V into 2kΩ; RO = 0.02Ω at 100kHz enables low-impedance active filter feedback networks |
| 8 (NULL) | Factory trim terminal | No connection required; used for final VOS trimming; open circuit preserves specified offset performance |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit DC accuracy | 75µV max VOS + 2.0µV/°C drift ensures <1LSB error over 0°C–70°C in 16-bit (65,536-step) systems |
| Gain ≥ 2 stability | Decompensated design delivers 200MHz GBW only when closed-loop gain ≥ 2; prevents oscillation in DAC I-to-V buffers |
| Low-distortion AC performance | –96.5dB THD at 100kHz/10VP-P enables clean spectral purity in active filters and ADC front-ends |
| Optimized input noise | Total input noise minimized for RS = 1kΩ–20kΩ - matches typical DAC output impedance and photodiode transimpedance ranges |
| Robust input protection | 100Ω series resistors + back-to-back diodes per input limit fault current to <10mA under ±36V abs max stress |
Applications
| 16-Bit DAC Current-to-Voltage Converter | Precision Instrumentation Amplifier Front-End |
|---|---|
Use Scenario: Converting output current from LTC1597 16-bit parallel multiplying DAC into precise unipolar/bipolar voltage for analog control loops. IC Role / Device Role / Timing Role: Primary I-to-V conversion stage with gain = –RF, where RF = 6kΩ sets full-scale output and compensates DAC output capacitance. Use Value: 800ns settling to 150µV eliminates hold-time bottlenecks in 1MSPS+ closed-loop systems while maintaining <1LSB linearity via trimmed IB–. |
Use Scenario: Buffering differential sensor outputs (e.g., load cell, RTD bridge) into programmable-gain instrumentation amplifier inputs. IC Role / Device Role / Timing Role: Low-noise, high-Z noninverting buffer isolating sensitive bridge nodes from PGA input capacitance and digital switching noise. Use Value: 5nV/√Hz input voltage noise + 0.6pA/√Hz current noise preserves µV-level signal integrity; 200MHz GBW maintains phase margin in multi-stage gain blocks. |
| High-Speed ADC Driver | Low-Distortion Active Filter Stage |
Use Scenario: Driving LTC1605 16-bit, 100ksps sampling ADC with ±10V input range in automated test equipment. IC Role / Device Role / Timing Role: Noninverting unity-gain buffer (AV = 1) - not supported; instead used at AV = 2+ to maintain stability and full 16-bit AC/DC performance. Use Value: 30V/µs slew rate and 800ns settling enable accurate capture of fast transient events without aperture uncertainty degradation. |
Use Scenario: Implementing 4th-order Butterworth anti-aliasing filter with 100kHz cutoff before 16-bit SAR ADC sampling. IC Role / Device Role / Timing Role: High-slew-rate gain stage (AV = 2–10) in multiple-feedback or state-variable topology requiring wide bandwidth and low harmonic distortion. Use Value: –96.5dB THD at 100kHz ensures filter passband introduces <0.0015% distortion, preserving ENOB in high-resolution measurement channels. |
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 |
|---|---|---|---|
| LT1468CS8-2#PBF | Same core die, SO-8 package; θJA = 190°C/W vs 43°C/W; no exposed thermal pad | Better suited for low-power, space-constrained boards where thermal dissipation <150mW is sufficient | Select LT1468CDD-2#PBF for high-output-drive applications (>±12V into 2kΩ) requiring lower junction temperature rise. |
| LT1469-2#PBF | Dual-channel version; identical specs per channel but 14-lead SO package; higher supply current (7.0mA/ch) | Reduces component count in multi-channel data acquisition systems needing matched pair performance | Choose LT1468CDD-2#PBF for single-channel, thermally demanding designs where board area and thermal management are prioritized. |
Compared with LT1468CS8-2#PBF, LT1468CDD-2#PBF offers 4.4× lower thermal resistance for sustained high-output-current operation; versus LT1469-2#PBF, it provides superior power efficiency and smaller footprint in single-amplifier signal chains.
Availability
LT1468CDD-2#PBF is available at Aetrix Electronics and suitable for 16-bit DAC current-to-voltage conversion, precision instrumentation front-ends, and high-speed ADC driver applications requiring stable component supply across commercial temperature range.
Supply support for LT1468CDD-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) acquired Linear Technology in 2017 and continues its legacy of high-performance analog ICs for precision signal conditioning and power management.
The LT1468 family was designed specifically for 16-bit data acquisition systems requiring simultaneous high DC accuracy and wide small-signal bandwidth, targeting DAC I-to-V conversion, ADC buffering, and low-distortion active filtering.
FAQ
What is the minimum stable gain for LT1468CDD-2#PBF?
The LT1468CDD-2#PBF is decompensated and requires a minimum closed-loop gain of 2 (AV ≥ 2) for stability. This applies to both inverting (AV = –2) and noninverting (AV = +2) configurations. Attempting unity-gain operation may cause peaking or oscillation due to reduced phase margin.
Can LT1468CDD-2#PBF drive a 2kΩ load to ±12.8V with ±15V supplies?
Yes. The LT1468CDD-2#PBF guarantees a minimum output swing of ±12.8V into 2kΩ with ±15V supplies at 25°C, as specified in the Electrical Characteristics table. This capability supports full-scale operation in 16-bit systems with 2.5V LSB resolution.
What is the purpose of Pin 1 and Pin 8 on LT1468CDD-2#PBF?
Pin 1 and Pin 8 are factory trim terminals for inverting input bias current and input offset voltage, respectively. Neither pin requires external connection; leaving them unconnected preserves the specified 75µV VOS max and ±10nA IB– max performance.
How does LT1468CDD-2#PBF achieve low input bias current in inverting applications?
The LT1468CDD-2#PBF employs laser-trimmed input circuitry that nulls inverting input bias current (IB–) at zero common-mode voltage, achieving ±10nA max. This minimizes offset errors in DAC I-to-V converters where feedback resistor current directly contributes to output error.
Is LT1468CDD-2#PBF compatible with ±5V supplies?
Yes. The LT1468CDD-2#PBF is fully specified for ±5V operation, delivering 190MHz gain bandwidth, 22V/µs slew rate, and ±2.8V output swing into 2kΩ. Its PSRR >98dB ensures robust rejection of ±5V rail noise in mixed-signal systems.
LT1468CDD-2#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:
- 30V/µs
- Gain Bandwidth Product:
- 200 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT1468CDD-2#PBF FAQ
1.How can I place an order for LT1468CDD-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1468CDD-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 LT1468CDD-2#PBF reliable?
The price and inventory of LT1468CDD-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 LT1468CDD-2#PBF is usually 5 days.
3.What payment methods are accepted for LT1468CDD-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1468CDD-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1468CDD-2#PBF?
LT1468CDD-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1468CDD-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 LT1468CDD-2#PBF?
For technical support, including LT1468CDD-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1468CDD-2#PBF requirements.
6.How does Aetrix verify that LT1468CDD-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT1468CDD-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 LT1468CDD-2#PBF meets industry standards.
7.What is the process for return or replacement of LT1468CDD-2#PBF?
All LT1468CDD-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1468CDD-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 LT1468CDD-2#PBF part is unused and in its original packaging.
Return procedure for LT1468CDD-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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