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Analog Devices Inc. LT1468ACDD#PBF
- Part No.:
- LT1468ACDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT1468ACDD#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:242
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Product details
Overview
LT1468ACDD#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 time to 150 µV for 10 V steps. Its complementary bipolar process enables low distortion (–96.5 dB THD at 100 kHz), 5 nV/√Hz input voltage noise, and tailored input bias current matching for inverting DAC I-to-V conversion.
For engineers reviewing the LT1468ACDD#PBF datasheet, LT1468ACDD#PBF pinout, LT1468ACDD#PBF application, or LT1468ACDD#PBF equivalent, key selection criteria include guaranteed 75 µV max input offset voltage at ±15 V over 0°C to 70°C, DFN-8 (3 mm × 3 mm) package thermal performance (θJA = 43°C/W), and unity-gain stability with capacitive load drive up to 100 pF.
Technical Context
The LT1468ACDD#PBF employs a single-stage complementary bipolar architecture enabling fast settling without phase reversal up to 0.5 V below V+, with input stage protection via 100 Ω series resistors and back-to-back diodes. Its bias current cancellation targets the inverting input for minimal error in current-input applications.
DC accuracy is maintained by trimming input offset voltage and inverting input bias current at zero common-mode voltage; noninverting input bias current remains untrimmed, making balanced source resistance counterproductive. Total input noise is optimized for source impedances between 1 kΩ and 20 kΩ.
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 in active filters without large-signal distortion |
| Settling Time | 900 ns to 150 µV (AV = –1, 10 V step) - enables 16-bit accuracy in DAC I-to-V converters with <1.7 µs total system settling |
| Input Offset Voltage | Max 75 µV at ±15 V, 0°C to 70°C - guarantees ≤0.5 LSB error in 16-bit systems with ±12.8 V output swing |
| THD + Noise | –96.5 dB at 100 kHz, 10 VP-P - meets 16-bit AC performance requirements up to 100 kHz in precision instrumentation |
| Input Noise Density | 5 nV/√Hz voltage noise + 0.6 pA/√Hz current noise - minimizes total noise in 1 kΩ–20 kΩ source impedance range |
| Supply Current | 5.2 mA typical at ±15 V - balances speed and power for high-accuracy signal chains requiring low thermal drift |
Pinout & Package
LT1468ACDD#PBF uses an 8-lead (3 mm × 3 mm) plastic DFN package with exposed pad internally connected to V–. Thermal resistance is θJA = 43°C/W. Pin 8 (NULL) is factory-trimmed and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NULL | Factory-trim connection for inverting input bias current; no external connection permitted |
| 2 | –IN | Inverting input terminal; bias current trimmed to minimize error in I-to-V configurations |
| 3 | +IN | Noninverting input terminal; untrimmed bias current requires asymmetric source design |
| 4 | V– | Negative supply rail; exposed pad internally tied to this pin for thermal and electrical grounding |
| 5 | DNC* | No-connect terminal; internal test node - must be left floating per datasheet |
| 6 | V+ | Positive supply rail; supports ±5 V to ±15 V operation with specified AC/DC performance |
| 7 | OUT | Amplifier output; drives ≥±12.8 V into 2 kΩ load with <0.01% settling to 150 µV |
| 8 | NULL | Second factory-trim node for offset voltage; must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit DC + AC accuracy | Guaranteed 75 µV VOS max and –96.5 dB THD at 100 kHz enable full 16-bit resolution in both static and dynamic operation |
| Tailored inverting input bias | Inverting input bias current trimmed to ±10 nA max eliminates need for matched source resistors in DAC I-to-V designs |
| Optimized total input noise | Minimum integrated noise achieved with 1 kΩ–20 kΩ source resistance - avoids noise degradation from current-noise dominance |
| Capacitive load drive | Stable with up to 100 pF in unity gain and 300 pF in AV = –1 - simplifies anti-alias filter integration without isolation resistors |
| Input voltage range | Operates with inputs to V– and within 0.5 V of V+ - supports rail-to-rail input sensing without phase reversal artifacts |
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 with minimal glitch-induced settling error. IC Role / Device Role / Timing Role: Primary I-to-V conversion stage with 900 ns settling to 150 µV, compensating DAC output capacitance via 6 kΩ/20 pF feedback network. Use Value: Enables 1.7 µs total system settling for 16-bit accuracy - fastest Linear Technology op amp for this function per AN74 validation. | Use Scenario: Building high-CMRR, low-drift instrumentation front-end for sensor signal conditioning in industrial monitoring. IC Role / Device Role / Timing Role: Precision gain stage with 96 dB CMRR and 2 µV/°C VOS drift, configured as difference amplifier with matched resistor networks. Use Value: Maintains 16-bit linearity over temperature while rejecting common-mode noise from long sensor leads. |
| ADC Buffer | Low Distortion Active Filter |
Use Scenario: Driving 16-bit SAR or sigma-delta ADC (e.g., LTC1605) with low source impedance and minimal THD-induced quantization error. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-Z sample-and-hold input from driving circuitry, preserving 100 kHz bandwidth and 16-bit SNR. Use Value: Delivers –96.5 dB THD at 100 kHz and ±12.8 V swing into 2 kΩ - prevents AC performance degradation in high-resolution data acquisition. | Use Scenario: Implementing 100 kHz bandpass filter for signal generator cleanup or spectral analysis front-end. IC Role / Device Role / Timing Role: High-linearity gain block in multi-op-amp filter topology (e.g., 1468 TA05), operating at AV = –1 with 300 pF capacitive load tolerance. Use Value: Achieves –103 dB second-harmonic distortion at 100 kHz with 3.5 VRMS signal - exceeds 16-bit SFDR requirements. |
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 with identical specs per amplifier; higher supply current (2 × 5.2 mA); SO-8 package | Requires PCB redesign for dual-channel use; not drop-in for single-channel layouts | Select when space-constrained designs need two matched 16-bit amplifiers in one package |
| LTC6228IDC#PBF | Faster slew rate (40 V/µs), lower noise (4.2 nV/√Hz), but higher VOS (125 µV max) and no factory-trimmed inverting input bias | Better for wideband active filters; less suitable for precision I-to-V where bias current matching is critical | Choose for >100 kHz signal paths where speed/noise dominate over DC matching requirements |
Compared with LT1468ACDD#PBF, LT1469CS8#PBF offers channel density at the cost of layout compatibility, while LTC6228IDC#PBF trades DC precision for enhanced AC performance - neither is pin-compatible, and LT1468ACDD#PBF remains optimal for 16-bit DAC buffering where inverting input bias matching is essential.
Availability
LT1468ACDD#PBF is available at Aetrix Electronics and suitable for 16-bit data acquisition systems, precision instrumentation front-ends, and high-fidelity active filter designs requiring stable component supply across industrial temperature ranges.
Supply support for LT1468ACDD#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 and maintains its legacy of high-performance analog ICs for precision signal conditioning.
The LT1468 product line was designed specifically for 16-bit mixed-signal systems demanding simultaneous high DC accuracy and wideband AC performance - targeting DAC I-to-V conversion, ADC buffering, and low-distortion filtering.
FAQ
What is the maximum input offset voltage specification for LT1468ACDD#PBF over its operating temperature range?
The LT1468ACDD#PBF has a maximum input offset voltage of 75 µV at ±15 V supply, specified over 0°C to 70°C. This value is guaranteed for the 'A' grade in the DD package and ensures ≤0.5 LSB error in 16-bit systems with ±12.8 V output swing. The datasheet confirms this limit applies across the full 0°C to 70°C range, not just at 25°C.
Can LT1468ACDD#PBF drive a 100 pF capacitive load in unity-gain configuration without instability?
Yes, LT1468ACDD#PBF is characterized to drive up to 100 pF in unity-gain configuration while maintaining stability and specified settling performance. The datasheet explicitly states this capability in the Capacitive Loading section and shows frequency response curves (G24/G25) confirming flat gain and adequate phase margin with 100 pF loads at ±15 V supply.
Why is Pin 8 (NULL) on LT1468ACDD#PBF required to be left unconnected?
Pin 8 on LT1468ACDD#PBF is a factory-trim node for input offset voltage calibration and must remain unconnected in all applications. The datasheet warns that any external connection will disrupt the internal trimming, degrading VOS performance beyond the guaranteed 75 µV maximum. This applies identically to Pin 1, both labeled NULL in the DD package pinout.
How does the inverting input bias current trimming in LT1468ACDD#PBF improve DAC I-to-V converter accuracy?
The LT1468ACDD#PBF trims the inverting input bias current to ±10 nA maximum, eliminating the need for matched source resistors that would otherwise convert bias current mismatch into offset errors. In DAC I-to-V applications, this directly reduces DC error contribution - for example, with a 6 kΩ feedback resistor, untrimmed bias current could induce >60 µV offset, exceeding the 75 µV VOS budget.
What thermal performance advantage does the DFN package provide for LT1468ACDD#PBF compared to SO-8 or PDIP options?
The LT1468ACDD#PBF's 3 mm × 3 mm DFN package achieves θJA = 43°C/W, significantly lower than SO-8 (190°C/W) and PDIP (130°C/W) variants. This 3× better thermal resistance allows higher continuous output current and improved long-term DC stability in compact layouts - critical for 16-bit systems where thermal EMFs and drift degrade accuracy.
LT1468ACDD#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:
- 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-DFN (3x3)
LT1468ACDD#PBF FAQ
1.How can I place an order for LT1468ACDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1468ACDD#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 LT1468ACDD#PBF reliable?
The price and inventory of LT1468ACDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1468ACDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1468ACDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1468ACDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1468ACDD#PBF?
LT1468ACDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1468ACDD#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 LT1468ACDD#PBF?
For technical support, including LT1468ACDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1468ACDD#PBF requirements.
6.How does Aetrix verify that LT1468ACDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1468ACDD#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 LT1468ACDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1468ACDD#PBF?
All LT1468ACDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1468ACDD#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 LT1468ACDD#PBF part is unused and in its original packaging.
Return procedure for LT1468ACDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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