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Analog Devices Inc. LT1168IS8#TRPBF
- Part No.:
- LT1168IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1168IS8#TRPBF.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,777
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Product details
Overview
LT1168IS8#TRPBF 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 0.4% max gain error at G=10 - all while consuming just 530µA max supply current across ±2.3V to ±18V supplies. It is widely deployed in strain gauge and thermocouple amplification within industrial sensor signal chains.
For engineers reviewing the LT1168IS8#TRPBF datasheet, LT1168IS8#TRPBF pinout, LT1168IS8#TRPBF application, or LT1168IS8#TRPBF equivalent, key selection criteria include its laser-trimmed 0.3µV/°C input offset drift, 90dB CMRR at G=1, 103dB PSRR at G=1, and guaranteed operation from –40°C to +85°C in the SO-8 package.
Technical Context
The LT1168IS8#TRPBF implements a three-op-amp instrumentation architecture with laser-trimmed internal 24.7kΩ resistors (R1/R2) and superbeta NPN input transistors (Q1/Q2), enabling picoampere input bias current (250pA max) and precise gain setting via single external RG. Its transconductance-scaling preamp stage maintains bandwidth stability across gain settings - delivering 400kHz BW at G=1 and 1kHz at G=1000.
It features ESD-protected inputs (13kV HBM), drives capacitive loads up to 1000pF without instability, and supports reference-based single-ended output with 1±0.0001 reference gain accuracy. The REF pin connects to an internal 30kΩ resistor network; series resistance >6Ω degrades CMRR to ≤80dB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 10,000 set by single external resistor RG per G = 1 + (49.4kΩ/RG); enables compact, low-component-count precision gain programming |
| Input Offset Voltage | 40µV max (RTI, G=1000); laser-trimmed for high DC accuracy without external nulling circuitry |
| Supply Current | 530µA max across ±2.3V to ±18V; enables battery-powered operation with minimal quiescent power impact |
| CMRR | 90dB min at G=1 (1kΩ source imbalance); ensures rejection of common-mode interference in noisy industrial environments |
| PSRR | 103dB min at G=1; maintains output stability against supply rail ripple in mixed-signal systems |
| Input Voltage Noise | 10nV/√Hz at 1kHz; preserves signal integrity in low-level sensor interfaces such as bridge-based transducers |
| Operating Temp | –40°C to +85°C; qualified for industrial and automotive under-hood sensor conditioning applications |
Pinout & Package
LT1168IS8#TRPBF is housed in an 8-lead plastic SO (S8) package, 3.9mm × 4.9mm, with standard SOIC footprint and gull-wing leads. Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG Connection | External gain-setting resistor terminals; parallel connection determines transconductance of preamp stage |
| 2 | Inverting Input (–IN) | Differential input node; superbeta NPN input stage enables 250pA max bias current and 200GΩ input resistance |
| 3 | Non-inverting Input (+IN) | Differential input node; matched to Pin 2 for <20ppm gain nonlinearity at G=10 |
| 4 | Negative Supply (–VS) | Power rail connection; supports operation down to ±2.3V; input common-mode range extends to –VS + 1.9V |
| 5 | Reference (REF) | Output voltage reference point; internal 30kΩ resistor network; series impedance must be minimized to preserve CMRR |
| 6 | Output | Single-ended amplified output; capable of ±10V swing into 10kΩ load; stable with up to 1000pF capacitive load |
| 7 | Positive Supply (+VS) | Power rail connection; supports operation up to ±18V; input common-mode range extends to +VS – 1.4V |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain programming | Eliminates need for matched resistor networks or trimming pots - reduces BOM count and layout area vs discrete designs |
| Laser-trimmed input offset drift | 0.3µV/°C max ensures stable DC performance over temperature without recalibration in field-deployed sensors |
| IEC 1000-4-2 Level 4 ESD compliance | Passes ±15kV contact discharge when used with two external 5kΩ resistors - meets industrial EMC requirements |
| Low 1/f noise corner | 2Hz at G=1 (per typical curve); enables accurate measurement of slow-varying signals like pressure or weight without 0.1–10Hz noise corruption |
| Capacitive load drive capability | Stable with 1000pF output load across all gains - simplifies anti-aliasing filter integration without isolation buffers |
Applications
| Strain Gauge Amplifier | Thermocouple Amplifier |
|---|---|
|
Use Scenario: Amplifying µV-level differential output from full-bridge strain gauges in load cells and structural monitoring systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing programmable gain, high CMRR, and low drift to resolve sub-10µV signals amid millivolt-level common-mode noise. Use Value: Enables 16-bit+ effective resolution in 24-bit ADC systems without chopper stabilization or auto-zero circuitry. |
Use Scenario: Conditioning Type K/J thermocouple outputs in industrial process controllers and HVAC sensors. IC Role / Device Role / Timing Role: Cold-junction compensated signal conditioner with RTI noise <0.3µVP-P (0.1–10Hz) and input range supporting ±10V output swing. Use Value: Delivers ±0.5°C accuracy over –40°C to +85°C ambient without external cold-junction compensation ICs. |
| Differential-to-SE Converter | Battery-Powered Data Acquisition |
|
Use Scenario: Converting differential sensor outputs (e.g., MEMS accelerometers, current shunts) to single-ended signals for SAR ADC input. IC Role / Device Role / Timing Role: High-impedance, low-noise differential receiver with REF pin allowing flexible output level shifting relative to ADC reference. Use Value: Eliminates need for additional op-amp level-shifting stages, reducing power and board space in portable DAQ modules. |
Use Scenario: Signal conditioning front-end in handheld multimeters, portable environmental monitors, and wireless sensor nodes. IC Role / Device Role / Timing Role: Micropower instrumentation amplifier operating from 3.3V or dual ±5V rails with 350µA typical supply current. Use Value: Extends battery life beyond 1 year in continuous-sampling 10ksps systems using CR2032 or AA cells. |
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), higher input offset (50µV max), no IEC 1000-4-2 certification; pin-compatible but not drop-in due to different RG configuration (single-pin vs dual-pin) | Less suitable for ultra-low-power or high-EMC industrial environments; requires external ESD protection for Level 4 compliance | Select AD620ARZ only if legacy design reuse or cost sensitivity outweighs power and EMC advantages of LT1168IS8#TRPBF |
| INA128UA | Wider gain range (1–10,000), but higher noise (12nV/√Hz), lower CMRR (110dB typ at G=100), and no specified IEC 1000-4-2 performance | Acceptable for lab-grade instrumentation where EMC robustness is secondary; lacks guaranteed –40°C to +85°C performance across full spec | Choose INA128UA for general-purpose bench equipment; avoid in field-deployed or safety-critical systems requiring validated ESD immunity |
Compared with AD620ARZ and INA128UA, the LT1168IS8#TRPBF offers superior micropower efficiency (530µA vs ≥1.3mA), lower 0.1–10Hz noise (0.28µVP-P), and factory-verified IEC 1000-4-2 Level 4 compliance - making it the preferred choice for battery-operated, high-reliability industrial sensing.
Availability
LT1168IS8#TRPBF is available at Aetrix Electronics and suitable for industrial sensor conditioning, portable medical devices, and precision data acquisition systems requiring stable component supply and long-term lifecycle support.
Supply support for LT1168IS8#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, 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 LT1168IS8#TRPBF belongs to ADI's precision instrumentation amplifier product line, designed specifically for low-power, high-accuracy sensor signal conditioning in harsh electromagnetic and thermal environments.
FAQ
What is the maximum gain error specification for LT1168IS8#TRPBF at G = 10?
The LT1168IS8#TRPBF has a maximum gain error of 0.4% at G = 10, as specified in the Electrical Characteristics table under the LT1168I grade (–40°C to +85°C). This value excludes tolerance contributions from the external gain resistor RG, which must be selected separately for system-level accuracy.
Does LT1168IS8#TRPBF support single-supply operation?
Yes, the LT1168IS8#TRPBF supports single-supply operation when the REF pin is biased above the negative rail (e.g., to VCC/2) and at least one input remains ≥2.5V above ground. The datasheet includes a verified barometer application demonstrating stable 3.3V single-supply use with full input common-mode range utilization.
What is the input voltage noise density of LT1168IS8#TRPBF at 1kHz?
The LT1168IS8#TRPBF exhibits an input voltage noise density of 10nV/√Hz at 1kHz, measured RTI (referred-to-input) under standard conditions (TA = 25°C, VS = ±15V, RL = 10kΩ). This value is consistent across all gain configurations and forms the basis for its suitability in low-level sensor interfaces.
How does LT1168IS8#TRPBF achieve ESD robustness to 13kV HBM?
The LT1168IS8#TRPBF integrates on-chip ESD protection diodes on both inputs rated to 13kV per Human Body Model (HBM), verified during wafer sort. When configured with two external 5kΩ resistors per the IEC 1000-4-2 test setup, it passes ±15kV contact discharge - exceeding Level 4 requirements without external TVS devices.
Can LT1168IS8#TRPBF drive a 1000pF capacitive load stably?
Yes, the LT1168IS8#TRPBF is explicitly characterized for stable operation with up to 1000pF capacitive load across all gain settings (G = 1 to 1000), as confirmed in Figure 16 of the datasheet. No external isolation resistor or compensation network is required, simplifying anti-aliasing filter implementation.
LT1168IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 80 pA
- Voltage - Input Offset:
- 20 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
LT1168IS8#TRPBF FAQ
1.How can I place an order for LT1168IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1168IS8#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 LT1168IS8#TRPBF reliable?
The price and inventory of LT1168IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1168IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1168IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1168IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1168IS8#TRPBF?
LT1168IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1168IS8#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 LT1168IS8#TRPBF?
For technical support, including LT1168IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1168IS8#TRPBF requirements.
6.How does Aetrix verify that LT1168IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1168IS8#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 LT1168IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1168IS8#TRPBF?
All LT1168IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1168IS8#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 LT1168IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1168IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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