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Analog Devices Inc. LT1468IDD#TRPBF
- Part No.:
- LT1468IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT1468IDD#TRPBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,472
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Product details
Overview
LT1468IDD#TRPBF from Analog Devices (formerly Linear Technology) is a precision high-speed operational amplifier optimized for 16-bit data acquisition systems. It delivers 90 MHz gain bandwidth, 22 V/µs slew rate, and 900 ns settling time to ±150 µV for 10 V steps - enabling high-fidelity DAC current-to-voltage conversion and ADC buffering in demanding instrumentation applications.
For engineers reviewing the LT1468IDD#TRPBF datasheet, LT1468IDD#TRPBF pinout, LT1468IDD#TRPBF application, or LT1468IDD#TRPBF equivalent, this page provides verified technical context, package-specific pin mapping, DC/AC performance trade-offs, and real-world design guidance for precision inverting and noninverting configurations at ±5 V and ±15 V supplies.
Technical Context
The LT1468IDD#TRPBF employs a complementary bipolar process with tailored input offset voltage drift (≤2 µV/°C) and inverting input bias current cancellation - specifically engineered for low-error I-to-V conversion where source impedance imbalance would degrade accuracy. Its single-stage architecture enables fast settling without phase reversal up to 0.5 V below the positive rail.
It achieves unity-gain stability while maintaining >90 dB PSRR and CMRR across 100 kHz, supports capacitive loads up to 100 pF (unity gain) or 300 pF (gain = –1), and features factory-trimmed nulling on Pin 8 (DNC) to minimize inverting input current error in precision inverting topologies.
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 <0.001% harmonic distortion in ADC buffer applications. |
| Slew Rate | 22 V/µs at ±15 V - enables full-scale 10 V step response within 450 ns, critical for active filter and instrumentation amplifier large-signal fidelity. |
| Settling Time | 900 ns to ±150 µV (10 V step, AV = –1) - meets 16-bit (150 µV = 1 LSB @ ±10 V) settling requirement without post-amplifier correction. |
| Input Offset Voltage | Max 200 µV (±15 V, –40°C to 85°C, DD package) - guarantees ≤0.33 LSB error in ±10 V full-scale 16-bit systems. |
| Input Noise Density | 5 nV/√Hz (voltage), 0.6 pA/√Hz (current) - optimally balanced for 1 kΩ < RS < 20 kΩ sources, minimizing total input-referred noise in photodiode and DAC I-to-V designs. |
| Output Swing | ±12.8 V into 2 kΩ (±15 V supply) - delivers 25.6 VPP dynamic range, supporting ±12 V signal chains without rail clipping. |
| Supply Current | 7.0 mA max (±15 V, –40°C to 85°C) - enables high-speed precision without excessive thermal load in space-constrained DFN layouts. |
Pinout & Package
LT1468IDD#TRPBF uses an 8-lead (3 mm × 3 mm) plastic DFN (DD package) with exposed pad internally connected to V–. Thermal resistance θJA = 43°C/W enables stable operation at full rated output current without external heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NULL | Offset Null Terminal | Connects to internal trimming network; unused in standard configurations - leave unconnected per datasheet. |
| 2 - –IN | Inverting Input | Factory-trimmed for minimal bias current (±10 nA max); primary node for precision I-to-V and inverting amplifier configurations. |
| 3 - +IN | Noninverting Input | Untrimmed input with higher bias current variation (±40 nA max); used in ADC buffer and noninverting gain stages. |
| 4 - V– | Negative Supply | Internally bonded to exposed thermal pad; must be soldered to PCB ground plane for thermal and electrical integrity. |
| 5 - DNC* | Factory Trim Terminal | No connection required - reserved for production calibration of inverting input bias current; floating per design. |
| 6 - V+ | Positive Supply | Accepts ±5 V or ±15 V dual supplies; PSRR >96 dB ensures immunity to supply ripple in mixed-signal systems. |
| 7 - OUT | Amplifier Output | Capable of driving 2 kΩ loads to ±12.8 V; supports up to 300 pF capacitive load in gain = –1 configuration. |
| 8 - NULL | Offset Null Terminal | Duplicate null pin; electrically identical to Pin 1 - leave unconnected unless external nulling is implemented. |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit accurate settling | 900 ns to ±150 µV ensures no missing codes in 16-bit DAC/ADC interfaces without post-processing correction. |
| Optimized input bias cancellation | Inverting input trimmed to ±10 nA max minimizes offset error in current-input applications like photodiode amps. |
| Total input noise optimization | 5 nV/√Hz + 0.6 pA/√Hz balances voltage/current noise for 1–20 kΩ source impedances - reduces integrated noise floor by 3× vs generic op amps. |
| Thermally enhanced DFN package | θJA = 43°C/W (vs 130°C/W for SO-8) allows sustained 7 mA supply current at 85°C ambient without derating. |
| Input stage protection | 100 Ω series resistors + back-to-back diodes enable ±15 V overvoltage tolerance on inputs with external current limiting. |
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 settling error and glitch energy. IC Role / Device Role / Timing Role: Primary I-to-V transimpedance amplifier with 6 kΩ feedback resistor and 20 pF compensation capacitor. Use Value: Achieves 1.7 µs settling to 16-bit accuracy - 30% faster than prior-generation precision op amps in same configuration. |
Use Scenario: Building 3-op-amp instrumentation amplifiers requiring matched gain, low THD, and rail-to-rail input common-mode range. IC Role / Device Role / Timing Role: Output stage amplifier in three-op-amp topology, handling high closed-loop gain and driving low-impedance loads. Use Value: Delivers –96.5 dB THD at 100 kHz while maintaining DC accuracy - enables clean signal conditioning for sensor front-ends. |
| ADC Buffer for 16-Bit Sampling | Low-Distortion Active Filter |
|
Use Scenario: Driving the sample-and-hold input of 16-bit ADCs (e.g., LTC1605) with minimal charge kickback and wide bandwidth. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-impedance signal sources from ADC input capacitance. Use Value: 90 MHz GBW and 22 V/µs slew rate preserve 16-bit AC/DC linearity up to 100 kHz input signals. |
Use Scenario: Implementing high-Q bandpass filters (e.g., 100 kHz center frequency, Q = 7) for signal generator cleanup or spectral analysis. IC Role / Device Role / Timing Role: Core gain block in multiple-feedback or state-variable filter topologies with precise pole placement. Use Value: –103 dB third-harmonic distortion at 100 kHz enables measurement-grade filtering without harmonic contamination. |
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#TRPBF | Dual-channel version with identical specs per amplifier; 14 mA total supply current vs 7 mA for single LT1468IDD#TRPBF. | Preferred when two matched 16-bit channels needed (e.g., differential ADC driver), but occupies larger SO-8 footprint. | Select LT1469 for space-tolerant dual-channel designs; avoid if board area or power budget is constrained. |
| LTC6228IDC#TRPBF | Rail-to-rail input/output, lower 3.2 V/µs slew rate, 105 MHz GBW, 1.25 mA supply current - optimized for low-voltage (±2.5 V) operation. | Better suited for battery-powered 16-bit systems with <5 V supplies; cannot achieve ±12.8 V swing or 22 V/µs slew of LT1468IDD#TRPBF. | Choose LTC6228 for ±2.5 V or single-supply 5 V systems requiring RRO; retain LT1468IDD#TRPBF for ±15 V industrial signal chains. |
Compared with LT1469CS8#TRPBF and LTC6228IDC#TRPBF, the LT1468IDD#TRPBF uniquely combines 22 V/µs slew rate, 900 ns 16-bit settling, and 3 mm × 3 mm DFN packaging - making it the only option that satisfies high-voltage, high-speed, space-constrained 16-bit DAQ requirements without compromise.
Availability
LT1468IDD#TRPBF is available at Aetrix Electronics and suitable for high-accuracy data acquisition systems, precision instrumentation front-ends, and 16-bit DAC/ADC interface circuits requiring stable component supply across extended temperature ranges.
Supply support for LT1468IDD#TRPBF 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 full product continuity, documentation, and manufacturing control for all Linear op amp families including the LT1468 series.
The LT1468 product line was designed specifically for 16-bit precision analog signal chains - bridging the gap between traditional precision op amps and high-speed amplifiers by delivering both sub-200 µV offset and 90 MHz bandwidth in a single device.
FAQ
What is the maximum operating temperature range for LT1468IDD#TRPBF?
The LT1468IDD#TRPBF is specified for operation from –40°C to +85°C. This extended industrial temperature range is guaranteed per datasheet testing, unlike the C-grade (0°C to 70°C) variants. The DD package's low θJA of 43°C/W ensures reliable thermal performance even at maximum ambient temperature with typical load conditions.
Can LT1468IDD#TRPBF drive a 100 pF capacitive load in unity-gain configuration?
Yes, the LT1468IDD#TRPBF is characterized to drive up to 100 pF in unity-gain (AV = +1) configuration without oscillation or excessive peaking. For loads exceeding 100 pF, a small series resistor (e.g., 10–50 Ω) should be added between the output and the load, along with optional feedback compensation as described in the Applications Information section of the LT1468IDD#TRPBF datasheet.
Why is Pin 5 labeled "DNC" and what happens if it is connected?
Pin 5 on the LT1468IDD#TRPBF is designated "DNC" (Do Not Connect) because it is used exclusively for factory trimming of the inverting input bias current during production. Connecting it externally may disrupt the calibrated bias cancellation, increasing IB– error beyond the guaranteed ±10 nA maximum and degrading DC accuracy in I-to-V applications. The datasheet explicitly requires this pin to remain unconnected in all circuit designs.
How does LT1468IDD#TRPBF achieve 16-bit settling performance with only 900 ns settling time?
The LT1468IDD#TRPBF achieves 900 ns to ±150 µV (16-bit at ±10 V) through a combination of single-stage architecture, optimized thermal layout, and minimized internal parasitics. Its 22 V/µs slew rate ensures rapid large-signal recovery, while high open-loop gain (>9000 V/mV) suppresses residual errors after slewing - eliminating the multi-stage settling tails that plague conventional precision op amps.
Is LT1468IDD#TRPBF pin-compatible with other LT1468 package variants like LT1468IS8#TRPBF?
No, the LT1468IDD#TRPBF (8-lead 3 mm × 3 mm DFN) is not pin-compatible with LT1468IS8#TRPBF (8-lead SOIC) or LT1468IN8#PBF (8-lead PDIP). While all share identical electrical functionality and pin functions, the DFN package has different mechanical layout, thermal pad grounding requirements, and solder reflow profile - requiring dedicated PCB footprint and layout validation.
LT1468IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 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#TRPBF FAQ
1.How can I place an order for LT1468IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1468IDD#TRPBF 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#TRPBF reliable?
The price and inventory of LT1468IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1468IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1468IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1468IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1468IDD#TRPBF?
LT1468IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1468IDD#TRPBF 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#TRPBF?
For technical support, including LT1468IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1468IDD#TRPBF requirements.
6.How does Aetrix verify that LT1468IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1468IDD#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1468IDD#TRPBF?
All LT1468IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1468IDD#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1468IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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