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Analog Devices Inc. LT1168AIS8#PBF
- Part No.:
- LT1168AIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1168AIS8#PBF.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,119
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Product details
Overview
LT1168AIS8#PBF from Analog Devices (acquired Linear Technology) is a micropower, precision instrumentation amplifier requiring only one external resistor to set gains from 1 to 10,000. It delivers 10nV/√Hz input voltage noise at 1kHz, 40µV max input offset voltage, and 90dB CMRR at G=1 while operating from ±2.3V to ±18V supplies - ideal for low-power bridge sensor signal conditioning in portable medical devices.
For engineers reviewing the LT1168AIS8#PBF datasheet, LT1168AIS8#PBF pinout, LT1168AIS8#PBF application, or LT1168AIS8#PBF equivalent, key selection criteria include guaranteed 0.4% max gain error at G=10, 20ppm max gain nonlinearity at G=10 with 2kΩ load, laser-trimmed input offset drift of 0.3µV/°C, and IEC 1000-4-2 Level 4 ESD compliance with two external 5kΩ resistors.
Technical Context
The LT1168AIS8#PBF implements a three-op-amp topology with laser-trimmed internal 24.7kΩ resistors and superbeta NPN input transistors, enabling picoampere bias currents (250pA max) and precise gain setting via single external RG. Its transconductance-scaling architecture maintains high open-loop gain across gain settings, minimizing gain-related errors.
It features a dedicated REF pin (Pin 5) establishing output reference level, differential input stage with 300GΩ input resistance, and output capable of driving ≥1000pF capacitive loads in all gain configurations while maintaining stability - critical for direct ADC interface without isolation buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | G = 1 to 10,000 set by single external resistor RG per G = 1 + (49.4kΩ/RG) |
| Input Offset Voltage | 40µV max (RTI) - enables sub-0.01% accuracy in 10mV full-scale strain gauge outputs |
| Gain Error | 0.4% max at G = 10 - eliminates need for system-level gain calibration in industrial DAQ |
| CMRR | 90dB min at G = 1 (1kΩ source imbalance) - rejects common-mode interference from noisy motor drives |
| Supply Current | 530µA max - supports >1-year battery life in handheld diagnostic equipment |
| Input Voltage Noise | 10nV/√Hz at 1kHz - preserves SNR in thermocouple amplifiers with <100µV signals |
| Operating Temp | –40°C to +85°C - qualified for automotive cabin temperature monitoring and industrial field sensors |
Pinout & Package
LT1168AIS8#PBF is housed in an 8-lead plastic SO package (S8), measuring 4.9mm × 3.9mm × 1.45mm, with standard SOIC thermal profile (θJA = 190°C/W) and RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG Connection | Terminals for external gain-setting resistor; parallel connection sets transconductance of preamp stage |
| 2 | Inverting Input (–IN) | Differential input node; 300GΩ input resistance minimizes loading on high-Z bridges |
| 3 | Non-inverting Input (+IN) | Differential input node; matched with Pin 2 for <20ppm gain nonlinearity at G=10 |
| 4 | Negative Supply (–VS) | Return path for internal current sources; must be decoupled within 1cm for PSRR >103dB |
| 5 | Reference (REF) | Output voltage reference point; series resistance >6Ω degrades CMRR to ≤80dB |
| 6 | Output | Single-ended output referenced to REF; drives 1000pF directly without oscillation |
| 7 | Positive Supply (+VS) | Power rail for internal amplifiers; supports wide range ±2.3V to ±18V |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed input offset | 40µV max ensures <0.04% FSR error in 100mV bridge outputs without trimming |
| Single-resistor gain programming | Eliminates matched resistor networks - reduces PCB area by >60% vs discrete op-amp designs |
| IEC 1000-4-2 Level 4 ESD | ±15kV contact discharge survivability with two external 5kΩ resistors - meets industrial EMC requirements |
| Capacitive load drive | Stable with up to 1000pF output capacitance - enables direct connection to SAR ADC inputs |
| Superbeta input stage | 250pA max input bias current allows use with >1MΩ sensor sources without offset degradation |
Applications
| Bridge Amplifiers | Strain Gauge Amplifiers |
|---|---|
Use Scenario: Amplifying mV-level differential output from Wheatstone bridge pressure transducers in HVAC control systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and output referencing. Use Value: 90dB CMRR suppresses supply ripple and ground noise; 0.4% gain error avoids factory calibration per unit. | Use Scenario: Conditioning microvolt-level signals from bonded foil strain gauges in structural health monitoring sensors. IC Role / Device Role / Timing Role: Low-noise, low-drift gain block converting differential strain voltage to single-ended ADC input. Use Value: 10nV/√Hz noise floor preserves resolution in 24-bit sigma-delta measurements; 0.3µV/°C drift limits thermal error to <1 LSB over 40°C range. |
| Thermocouple Amplifiers | Medical Instrumentation |
Use Scenario: Cold-junction compensated amplification of Type-K thermocouple outputs (−5mV to +60mV) in industrial ovens. IC Role / Device Role / Timing Role: High-input-impedance, low-drift amplifier rejecting millivolt-level common-mode noise from heating elements. Use Value: 300GΩ input resistance prevents thermocouple wire leakage errors; 20ppm nonlinearity ensures ±0.5°C accuracy over full scale. | Use Scenario: Front-end amplification of ECG electrode signals in portable patient monitors. IC Role / Device Role / Timing Role: Micropower instrumentation amplifier providing gain and DC-coupled output referencing for analog front-end. Use Value: 530µA supply current extends battery life; ESD-hardened inputs withstand 13kV HBM - critical for clinical handling safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD620ARZ | Higher supply current (1.3mA typ), wider gain error (0.1% typ at G=10), no IEC 1000-4-2 certification | Less suitable for battery-powered designs; requires external ESD protection for industrial environments | Select when legacy AD620 footprint compatibility is mandatory and power budget allows >2× LT1168AIS8#PBF consumption |
| INA128UA | Lower CMRR (110dB typ at G=100), higher input bias current (500pA typ), no laser-trimmed offset drift spec | Acceptable for lower-precision industrial sensors but not for medical-grade drift-critical applications | Select when cost sensitivity outweighs long-term stability requirements and 0.3µV/°C drift is not required |
Compared with AD620ARZ and INA128UA, LT1168AIS8#PBF provides superior micropower operation (530µA vs >1mA), guaranteed low-drift performance (0.3µV/°C), and built-in IEC 1000-4-2 compliance - making it optimal for portable, high-reliability sensor interfaces where calibration stability and EMC robustness are critical.
Availability
LT1168AIS8#PBF is available at Aetrix Electronics and suitable for bridge amplifiers, strain gauge signal chains, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1168AIS8#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LT1168AIS8#PBF belongs to ADI's precision instrumentation amplifier product line, engineered specifically for low-power, high-accuracy sensor signal conditioning in battery-operated and harsh-environment applications.
FAQ
What is the maximum gain error specification for LT1168AIS8#PBF at G = 10?
The LT1168AIS8#PBF has a maximum gain error of 0.4% at G = 10 under specified conditions (TA = –40°C to +85°C, VS = ±15V). This value is guaranteed across the full operating temperature range and does not include tolerance of the external gain resistor RG, which must be selected separately for target accuracy.
Can LT1168AIS8#PBF drive a 1000pF capacitive load without instability?
Yes, the LT1168AIS8#PBF is explicitly characterized to remain stable with capacitive loads up to 1000pF in any gain configuration. This capability allows direct interfacing with sampling capacitors of SAR ADCs without requiring isolation buffers or compensation networks - verified in the manufacturer's Typical Performance Characteristics (Figure 1168 G22).
What is the input voltage range for LT1168AIS8#PBF when operating at ±15V supplies and G = 1?
At ±15V supplies and G = 1, the LT1168AIS8#PBF input voltage range is specified as –VS + 1.9V to +VS – 1.2V, i.e., –13.1V to +13.8V. This range is reduced at higher gains due to internal IR drops, as detailed in the Theory of Operation section and visualized in Figures 1168 F02 and F03.
Does LT1168AIS8#PBF meet IEC 1000-4-2 Level 4 ESD requirements?
Yes, the LT1168AIS8#PBF meets IEC 1000-4-2 Level 4 (±15kV contact discharge) when used with two external 5kΩ resistors connected between each input and the REF pin, as documented in the Features list and Absolute Maximum Ratings table of the official datasheet.
What is the guaranteed input offset voltage drift for LT1168AIS8#PBF over temperature?
The LT1168AIS8#PBF guarantees a maximum input offset voltage drift of 0.3µV/°C over the full –40°C to +85°C operating temperature range. This laser-trimmed specification ensures minimal thermal-induced error in precision measurement systems, such as laboratory-grade data acquisition and medical diagnostics equipment.
LT1168AIS8#PBF 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:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 400 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 40 pA
- Voltage - Input Offset:
- 15 µV
- Current - Supply:
- 350µA
- Current - Output / Channel:
- 32 mA
- Voltage - Supply Span (Min):
- 4.6 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1168AIS8#PBF FAQ
1.How can I place an order for LT1168AIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1168AIS8#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 LT1168AIS8#PBF reliable?
The price and inventory of LT1168AIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1168AIS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1168AIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1168AIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1168AIS8#PBF?
LT1168AIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1168AIS8#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 LT1168AIS8#PBF?
For technical support, including LT1168AIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1168AIS8#PBF requirements.
6.How does Aetrix verify that LT1168AIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1168AIS8#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 LT1168AIS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1168AIS8#PBF?
All LT1168AIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1168AIS8#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 LT1168AIS8#PBF part is unused and in its original packaging.
Return procedure for LT1168AIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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