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Analog Devices Inc. LT1468IDD-2#PBF
- Part No.:
- LT1468IDD-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT1468IDD-2#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
LT1468IDD-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. It serves as a current-to-voltage converter for 16-bit DACs and as an ADC buffer in high-fidelity data acquisition systems operating from ±5V or ±15V supplies across –40°C to 85°C.
For engineers reviewing the LT1468IDD-2#PBF datasheet, LT1468IDD-2#PBF pinout, LT1468IDD-2#PBF application, or LT1468IDD-2#PBF equivalent, this page provides verified package mapping (8-lead 3mm × 3mm DFN), confirmed pin functions, real-world settling time (800ns to 150µV), noise performance (5nV/√Hz), and validated alternatives for inverting and noninverting precision signal conditioning.
Technical Context
The LT1468IDD-2#PBF uses a decompensated architecture requiring minimum closed-loop gain of 2 (AV = –1 or ≥ +2) for stability, enabling higher open-loop gain at frequency than unity-gain-stable counterparts. Its input stage features trimmed inverting input bias current (≤10nA) and tailored offset drift (≤2µV/°C) for inverting applications like DAC I-to-V conversion.
DC precision is maintained via matched input transistor pairs and factory-trimmed nulling; AC performance leverages high slew rate and wide bandwidth to achieve <0.01% settling in 800ns for 10V steps while maintaining –96.5dB THD at 100kHz with 10VP-P output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 200MHz - Ensures ≥80dB open-loop gain at 100kHz for low distortion in ADC buffering. |
| Slew Rate | 30V/µs - Supports full-scale 10V step response within 333ns, critical for fast-settling active filters. |
| Input Offset Voltage (max) | 75µV - Enables ≤1LSB error in 16-bit DAC I-to-V conversion with 6kΩ feedback resistor. |
| Settling Time | 800ns to 150µV - Measured at AV = –1, 10V step; meets timing budget for 1MSPS+ data acquisition. |
| Input Noise Voltage | 5nV/√Hz - Dominates total noise for source impedances 1k–20kΩ, optimal for photodiode amplifiers. |
| Supply Voltage Range | ±5V to ±15V - Compatible with industrial and test equipment rails; specified over full –40°C to 85°C range. |
| Common-Mode Rejection | 110dB - Maintains DC accuracy despite supply ripple or ground shifts in instrumentation front-ends. |
Pinout & Package
LT1468IDD-2#PBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with exposed pad internally connected to V–. Pin 8 is unconnected (factory trim only) and must remain floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NULL) | Null offset adjustment terminal | Unused in standard operation; no external connection required. |
| 2 (–IN) | Inverting input | Factory-trimmed for minimal bias current (≤10nA); primary node for DAC current injection. |
| 3 (+IN) | Noninverting input | Untrimmed; higher bias current variation; used for reference or feedback in noninverting configurations. |
| 4 (V–) | Negative supply | Internally connects to exposed thermal pad; requires low-impedance PCB ground plane for thermal management. |
| 5 (DNC*) | Do not connect | Reserved pin; no internal connection; must be left unconnected per datasheet. |
| 6 (V+) | Positive supply | Accepts ±5V or ±15V; bypass with 0.01µF ceramic + 1µF tantalum for stable high-frequency operation. |
| 7 (OUT) | Output | Drives ≥±12.8V into 2kΩ load; supports 22mA short-circuit current with thermal protection. |
| 8 (NULL) | Factory inverting input bias trim | No user connection; solder mask must cover to prevent accidental contact. |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit DC accuracy | 75µV max VOS and 2µV/°C max drift enable sub-LSB error in precision DAC interfaces without calibration. |
| Gain ≥ 2 stability | Decompensated design achieves 200MHz GBW while remaining stable at AV = –1 or AV ≥ +2, outperforming unity-gain op amps in speed-critical buffers. |
| Optimized total input noise | Minimum integrated noise achieved with source resistors between 1kΩ and 20kΩ-ideal for photodiode and sensor front-ends. |
| Low distortion at high frequency | –96.5dB THD at 100kHz/10VP-P ensures fidelity in active filter and instrumentation amplifier stages. |
| Robust input protection | 100Ω series resistors + back-to-back diodes on both inputs limit fault current to ≤10mA, enhancing system reliability. |
Applications
| 16-Bit DAC I-to-V Converter | Precision Instrumentation |
|---|---|
|
Use Scenario: Converting output current from LTC1597 16-bit parallel DAC into precise voltage for downstream processing. IC Role / Device Role / Timing Role: Inverting op amp with 6kΩ feedback resistor; compensates DAC output capacitance using 20pF capacitor. Use Value: Achieves <1LSB error (VOS + IB·6kΩ < 150µV) and 1.6µs settling to 150µV, meeting 16-bit monotonicity requirements. |
Use Scenario: Front-end gain stage in portable multimeter or calibration source requiring ultra-low drift. IC Role / Device Role / Timing Role: Noninverting buffer with gain ≥ 2; rejects common-mode noise from transducer leads. Use Value: 110dB CMRR and 2µV/°C VOS drift maintain 16-bit linearity over temperature without recalibration. |
| ADC Buffer | Low Distortion Active Filters |
|
Use Scenario: Driving LTC1605 16-bit, 100ksps ADC with ±10V input range in automated test equipment. IC Role / Device Role / Timing Role: Unity-gain follower (AV = +1 not supported; configured as AV = +2 with feedback network). Use Value: 800ns settling to 150µV enables full 16-bit resolution at 100ksps sampling without aperture uncertainty penalty. |
Use Scenario: Second-order Sallen-Key low-pass filter in audio or spectrum analyzer signal chain. IC Role / Device Role / Timing Role: Gain-of-2 amplifier with 22pF feedback capacitor; compensates for input pole induced by 33.2kΩ/1kΩ network. Use Value: 30V/µs slew rate prevents slew-induced distortion on 10VP-P signals up to 475kHz full-power bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision high-speed operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6090IS8#PBF | Unity-gain stable; 28MHz GBW; 2.5µV/°C VOS drift; SO-8 package | Better DC drift but lower bandwidth; suited for gain < 2 or space-constrained SO-8 layouts | Select when unity-gain stability or lower drift is prioritized over 200MHz bandwidth |
| ADA4898-1ARMZ | Unity-gain stable; 275MHz GBW; 120µV max VOS; 8-lead MSOP package | Higher bandwidth but looser DC specs; better for wideband non-precision filtering | Select when >200MHz bandwidth is needed and 16-bit DC accuracy is secondary |
Compared with LTC6090IS8#PBF and ADA4898-1ARMZ, the LT1468IDD-2#PBF uniquely balances 16-bit DC precision (75µV VOS), 200MHz bandwidth, and gain ≥2 stability-making it irreplaceable in DAC I-to-V and high-resolution ADC buffer roles where both speed and sub-LSB error are mandatory.
Availability
LT1468IDD-2#PBF is available at Aetrix Electronics and suitable for high-accuracy data acquisition systems, precision instrumentation front-ends, and 16-bit DAC interface circuits requiring stable component supply across extended temperature ranges.
Supply support for LT1468IDD-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, serving industrial, automotive, communications, and healthcare markets.
The LT1468-2 belongs to Linear Technology's precision high-speed op amp product line, engineered specifically for 16-bit data converter interfacing where simultaneous DC accuracy and AC performance are non-negotiable.
FAQ
What is the minimum stable gain for LT1468IDD-2#PBF?
The LT1468IDD-2#PBF is decompensated and requires a minimum closed-loop gain of 2 (AV ≥ +2 or AV = –1) for stability. Configurations with gain < 2-such as unity-gain followers-are unstable and may oscillate. The LT1468 (unity-gain stable version) should be used instead for AV = 1 applications.
Does LT1468IDD-2#PBF support ±5V operation?
Yes, the LT1468IDD-2#PBF is fully specified for ±5V and ±15V dual supplies across its entire operating temperature range (–40°C to 85°C). Electrical characteristics-including 75µV max input offset voltage, 30V/µs slew rate, and 200MHz gain bandwidth-are guaranteed under ±5V conditions per the datasheet's "Electrical Characteristics" tables.
What is the function of Pin 8 on LT1468IDD-2#PBF?
Pin 8 on the LT1468IDD-2#PBF is reserved for factory trimming of the inverting input bias current and has no user functionality. It must remain unconnected (floating) in all circuit designs. Solder mask should cover this pad to prevent accidental shorts or leakage paths that could degrade DC performance.
Can LT1468IDD-2#PBF drive heavy capacitive loads?
The LT1468IDD-2#PBF is not optimized for direct capacitive loading >100pF. For DAC outputs with tens of pF capacitance-as shown in the typical application-the recommended solution is to add a feedback capacitor (e.g., 22pF) to cancel the pole formed by feedback resistor and input capacitance. Direct driving of >200pF loads risks peaking or instability without external compensation.
How does LT1468IDD-2#PBF achieve 16-bit accuracy in DAC I-to-V conversion?
The LT1468IDD-2#PBF achieves 16-bit accuracy in DAC I-to-V conversion through 75µV max input offset voltage, ≤10nA max inverting input bias current (trimmed at VCM = 0V), and 2µV/°C max offset drift. With a 6kΩ feedback resistor, total error remains below 150µV (<1LSB of 10V full-scale), satisfying 16-bit monotonicity and linearity requirements without calibration.
LT1468IDD-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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT1468IDD-2#PBF FAQ
1.How can I place an order for LT1468IDD-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1468IDD-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 LT1468IDD-2#PBF reliable?
The price and inventory of LT1468IDD-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 LT1468IDD-2#PBF is usually 5 days.
3.What payment methods are accepted for LT1468IDD-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1468IDD-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1468IDD-2#PBF?
LT1468IDD-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1468IDD-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 LT1468IDD-2#PBF?
For technical support, including LT1468IDD-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1468IDD-2#PBF requirements.
6.How does Aetrix verify that LT1468IDD-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT1468IDD-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 LT1468IDD-2#PBF meets industry standards.
7.What is the process for return or replacement of LT1468IDD-2#PBF?
All LT1468IDD-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1468IDD-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 LT1468IDD-2#PBF part is unused and in its original packaging.
Return procedure for LT1468IDD-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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