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Analog Devices Inc. LT1468IS8
- Part No.:
- LT1468IS8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1468IS8.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,766
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Product details
Overview
LT1468IS8 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 to 150 µV for 10 V steps. It serves as a DAC current-to-voltage converter or ADC buffer in high-accuracy instrumentation, with ±15 V/±5 V dual-supply operation and guaranteed performance over –40°C to +85°C.
For engineers reviewing the LT1468IS8 datasheet, LT1468IS8 pinout, LT1468IS8 application, or LT1468IS8 equivalent, this page provides verified technical context, package-specific pin mapping, real-world application cards, and two validated alternative op amps for precision high-speed signal conditioning designs.
Technical Context
The LT1468IS8 employs a complementary bipolar process to achieve simultaneous high DC accuracy and wide AC bandwidth. Its input stage features trimmed inverting input bias current (≤10 nA max) and low offset voltage drift (≤2 µV/°C), specifically tailored for inverting configurations like DAC I-to-V conversion.
It delivers unity-gain stability, 90 MHz small-signal gain bandwidth at ±15 V, and maintains ≥1000 V/mV open-loop gain into 2 kΩ loads - enabling full 16-bit DC+AC performance in noninverting ADC buffer applications without external compensation.
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 precision filtering. |
| Slew Rate | 22 V/µs at ±15 V - supports clean large-signal transient response in active filters and instrumentation amplifiers. |
| Settling Time | 900 ns to 150 µV for 10 V step (AV = –1) - enables 16-bit settling in <1 µs for high-throughput DAC output buffering. |
| Input Offset Voltage | 75 µV max (±15 V, S8 package) - guarantees ≤0.5 LSB error in 16-bit systems with 10 V full-scale range. |
| Input Noise | 5 nV/√Hz voltage noise + 0.6 pA/√Hz current noise - optimized total input noise for source impedances 1 kΩ–20 kΩ. |
| Output Swing | ±12.8 V into 2 kΩ (±15 V supply) - delivers rail-to-rail usable dynamic range for ±10 V ADC interfaces. |
| THD + N | –96.5 dB at 100 kHz, 10 VP-P - meets 16-bit SFDR requirements up to 100 kHz in bandpass filter applications. |
Pinout & Package
LT1468IS8 is housed in an 8-lead plastic small outline (SO-8, narrow 0.150") package with exposed pad internally connected to V–. Pin 8 is unconnected (DNC) and reserved for factory trimming of inverting input bias current.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NULL) | Offset Null Terminal | Unused in standard operation; no connection required per datasheet. |
| 2 (–IN) | Inverting Input | Primary input node for I-to-V conversion; bias current trimmed to ≤10 nA for inverting accuracy. |
| 3 (+IN) | Noninverting Input | High-impedance input; not trimmed - use only in noninverting configurations where IB+ variation is acceptable. |
| 4 (V–) | Negative Supply | Power rail; exposed pad internally tied to V– - must be soldered to PCB ground plane for thermal and electrical integrity. |
| 5 (DNC*) | Do Not Connect | Factory trim pin; leave floating - connecting risks degrading inverting input bias current specification. |
| 6 (V+) | Positive Supply | Power rail; supports ±5 V to ±15 V operation - decoupling critical for 90 MHz bandwidth stability. |
| 7 (OUT) | Amplifier Output | Capable of driving ≥±12.8 V into 2 kΩ; stable with ≤100 pF capacitive load in unity gain. |
| 8 (NULL) | Offset Null Terminal | Unused; no connection - identical function to Pin 1; both are left unconnected in production designs. |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit accurate settling | 900 ns to 150 µV (0.0015% of 10 V) - eliminates need for post-amplifier digital correction in 16-bit DAC systems. |
| Optimized input bias cancellation | Inverting input bias current ≤10 nA max - minimizes offset error in precision I-to-V converters without matched source resistors. |
| Low-distortion architecture | –96.5 dB THD+N at 100 kHz - enables clean signal reconstruction in 100 kHz bandpass filters and ADC front-ends. |
| Thermally enhanced SO-8 package | θJA = 190°C/W (S8) - allows sustained 5.2 mA supply current operation at +85°C ambient without derating. |
| Wide supply range support | Operates from ±5 V to ±15 V - simplifies integration into legacy ±15 V industrial systems and modern low-voltage ±5 V data acquisition platforms. |
Applications
| 16-Bit DAC Current-to-Voltage Converter | Precision Instrumentation Amplifier Front-End |
|---|---|
|
Use Scenario: Converting 16-bit current-output DAC (e.g., LTC1597) into precise voltage output with minimal settling error. IC Role / Device Role / Timing Role: Primary I-to-V conversion stage; settles to 150 µV in 900 ns for 10 V step, matching DAC update rates up to 1 MSps. Use Value: Eliminates need for external nulling or post-processing - achieves full 16-bit linearity without calibration due to <75 µV VOS and trimmed IB–. |
Use Scenario: Buffering low-level sensor signals (e.g., strain gauge bridges) before programmable gain instrumentation amplifiers. IC Role / Device Role / Timing Role: High-Z input buffer with 5 nV/√Hz noise and 90 MHz bandwidth - preserves signal integrity while isolating sensor from downstream loading. Use Value: Enables sub-µV resolution measurements by minimizing added noise and offset drift (<2 µV/°C) across –40°C to +85°C operating range. |
| 16-Bit ADC Input Buffer | Low-Distortion Active Filter Stage |
|
Use Scenario: Driving the sample-and-hold input of 16-bit ADCs (e.g., LTC1605) with low source impedance and minimal THD. IC Role / Device Role / Timing Role: Noninverting unity-gain buffer; provides ≥1000 V/mV DC gain and –96.5 dB THD+N at 100 kHz to prevent aperture uncertainty. Use Value: Maintains 16-bit ENOB up to 100 kHz by limiting harmonic distortion below –96 dB - avoids SNR degradation in high-fidelity data capture. |
Use Scenario: Implementing 100 kHz bandpass filters (e.g., B&K 1051 signal generator cleanup) requiring ultra-low distortion. IC Role / Device Role / Timing Role: Gain stage in multiple-feedback topology; leverages 90 MHz GBW and 22 V/µs slew rate for flat group delay and minimal phase shift. Use Value: Achieves –103 dB second-harmonic suppression at 3.5 VRMS output - exceeds 16-bit SFDR requirements for test equipment signal conditioning. |
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 |
|---|---|---|---|
| LT1469CS8#TRPBF | Dual-channel version with identical specs per amplifier; 8 mA supply current vs 5.2 mA for single LT1468IS8. | Used when two matched 16-bit buffers or I-to-V stages are needed on one board - saves space vs two discrete LT1468IS8s. | Select LT1469CS8 if dual-channel functionality is required and board area is constrained; verify thermal dissipation with 8 mA/channel. |
| LTC6228IMS8E#TRPBF | Higher 145 MHz GBW but lower 12 V/µs slew rate; 0.95 nV/√Hz noise vs 5 nV/√Hz; specified for ±2.5 V to ±5.5 V only. | Better suited for low-voltage, high-bandwidth applications (e.g., 3.3 V ADC buffers); not rated for ±15 V operation. | Choose LTC6228IMS8E only for 5 V or lower supply systems needing >100 MHz bandwidth; avoid for ±15 V industrial DAC/ADC interfaces. |
Compared with LT1468IS8, LT1469CS8 offers channel density at higher quiescent power, while LTC6228IMS8E trades supply voltage range and slew rate for lower noise and higher bandwidth - making LT1468IS8 uniquely balanced for ±15 V, 16-bit, sub-µs settling applications.
Availability
LT1468IS8 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 LT1468IS8 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 support, manufacturing, and documentation for the LT1468 family. Linear Technology pioneered high-precision analog ICs with emphasis on metrology-grade performance.
The LT1468 product line was designed specifically for 16-bit data conversion systems - combining precision DC parameters (low VOS, trimmed IB–) with high-speed AC performance (90 MHz GBW, 22 V/µs SR) to eliminate system-level trade-offs.
FAQ
What is the maximum operating temperature range for the LT1468IS8?
The LT1468IS8 is specified and guaranteed over –40°C to +85°C ambient temperature. This extended industrial temperature range is confirmed in the Order Information table for the IS8 grade, distinguishing it from the commercial-grade CS8 variant (0°C to 70°C). The device's junction temperature limit remains 150°C, and its θJA of 190°C/W ensures reliable operation within this range when properly mounted on a PCB with adequate copper area.
Does the LT1468IS8 require external nulling components?
No, the LT1468IS8 does not require external nulling components in standard operation. Pins 1 and 8 are labeled NULL and are unused - the device uses internal factory trimming to achieve ≤75 µV input offset voltage and ≤10 nA inverting input bias current. Adding external nulling circuitry may degrade performance or violate the specified operating conditions outlined in the Applications Information section.
Can the LT1468IS8 drive capacitive loads, and what is the limit?
Yes, the LT1468IS8 can drive capacitive loads up to 100 pF in unity-gain configuration and up to 300 pF in inverting gain-of–1 configuration. For larger loads, the datasheet recommends adding a small series resistor (RO) between the output and load, plus a feedback capacitor (CF) from output to inverting input, with values calculated per the formula CF = (2RO/RF)CL. This preserves stability without sacrificing bandwidth.
How does the LT1468IS8 differ from the LT1468IDD variant?
The LT1468IS8 uses an 8-lead SOIC package (S8) with θJA = 190°C/W and operates from –40°C to +85°C, while the LT1468IDD uses a 3 mm × 3 mm DFN package (DD) with θJA = 43°C/W and identical temperature range. The DD variant offers superior thermal performance and smaller footprint but requires different PCB layout and reflow profiles. Electrical specifications are identical across packages for the same grade (I-grade).
Is the LT1468IS8 unity-gain stable, and what compensation is needed?
Yes, the LT1468IS8 is unity-gain stable and requires no external compensation for standard configurations. It maintains phase margin >60° at unity gain per Typical Performance curves. However, when using feedback resistors >2 kΩ in inverting mode, the datasheet recommends adding a feedback capacitor (CF > RG × CIN/RF) to cancel the pole formed by input capacitance and feedback network - preventing peaking or oscillation in high-precision I-to-V applications.
LT1468IS8 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:
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1468IS8 FAQ
1.How can I place an order for LT1468IS8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1468IS8 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 LT1468IS8 reliable?
The price and inventory of LT1468IS8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1468IS8 is usually 5 days.
3.What payment methods are accepted for LT1468IS8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1468IS8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1468IS8?
LT1468IS8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1468IS8 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 LT1468IS8?
For technical support, including LT1468IS8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1468IS8 requirements.
6.How does Aetrix verify that LT1468IS8 is sourced from the original manufacturer or authorized distributors?
All LT1468IS8 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 LT1468IS8 meets industry standards.
7.What is the process for return or replacement of LT1468IS8?
All LT1468IS8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1468IS8, 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 LT1468IS8 part is unused and in its original packaging.
Return procedure for LT1468IS8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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