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Analog Devices Inc. LT1920CS8#TRPBF
- Part No.:
- LT1920CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1920CS8#TRPBF.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,019
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Product details
Overview
LT1920CS8#TRPBF from Analog Devices (formerly Linear Technology) is a single-resistor-programmable, precision instrumentation amplifier optimized for low-power, high-accuracy signal conditioning of bridge, thermocouple, and strain gauge sensors. It delivers 7.5nV/√Hz input voltage noise at 1kHz, 0.3% max gain error at G=10, 30ppm max nonlinearity at G=10, and operates from ±2.3V to ±18V supplies with 1.3mA max supply current.
For engineers reviewing the LT1920CS8#TRPBF datasheet, LT1920CS8#TRPBF pinout, LT1920CS8#TRPBF application, or LT1920CS8#TRPBF equivalent, this page provides verified specifications, SO-8 package pin mapping, real-world use cases in medical and industrial sensing, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The LT1920CS8#TRPBF implements a modified three-op-amp architecture with laser-trimmed 24.7kΩ internal resistors and superbeta NPN input transistors, enabling picoampere-level input bias current (2nA max) and stable gain accuracy across temperature. Its gain equation G = 1 + (49.4kΩ/RG) supports precise programmability from 1 to 10,000 using only one external resistor.
It features integrated ESD protection (13kV HBM), drives capacitive loads up to 1000pF without instability, and maintains 75dB CMRR at G=1 and 80dB PSRR at G=1 - all while achieving 125µV max input offset voltage and 1µV/°C drift. The REF pin enables flexible single-ended output referencing with minimal series impedance impact on CMRR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 10,000 set by single external resistor RG - eliminates need for matched resistor networks and simplifies layout. |
| Input Voltage Noise | 7.5nV/√Hz at 1kHz - enables high-resolution measurement of µV-level sensor outputs without added noise floor. |
| Gain Error | 0.3% max at G=10 - ensures accurate scaling in precision data acquisition systems without post-calibration trimming. |
| Input Offset Voltage | 125µV max (RTI) - supports DC-coupled applications like thermocouple amplification with minimal zero-error drift. |
| Supply Current | 1.3mA max over ±2.3V to ±18V - allows operation from low-voltage rails (e.g., ±3V) while maintaining full performance. |
| CMRR | 75dB min at G=1 - rejects common-mode interference in noisy industrial environments with unshielded sensor wiring. |
| ESD Rating | 13kV HBM - withstands handling and board-level ESD events without latch-up or parameter shift. |
Pinout & Package
LT1920CS8#TRPBF is housed in an 8-lead plastic SO (SO-8, narrow 0.150") package compliant with JEDEC MS-012, with thermal resistance θJA = 190°C/W. Pin 1 is marked with a dot or beveled corner; the package is RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RG) | External Gain Set Resistor Connection | Connects to one end of RG; sets gain via G = 1 + (49.4kΩ/RG); open-circuit disables amplifier. |
| 2 (–IN) | Inverting Input | Differential input node; requires bias current return path (e.g., matched 10kΩ to ground) for proper DC operating point. |
| 3 (+IN) | Noninverting Input | Differential input node; same bias requirements as Pin 2; high-impedance (200GΩ) minimizes loading on high-Z sensors. |
| 4 (–VS) | Negative Supply Rail | Accepts –2.3V to –18V; must be decoupled locally with ≥0.1µF ceramic capacitor to reduce PSRR degradation. |
| 5 (REF) | Reference Input | Sets output common-mode level; series resistance >2Ω degrades CMRR and gain accuracy - buffer recommended for level-shifting. |
| 6 (OUTPUT) | Amplified Single-Ended Output | Drives loads down to 2kΩ; stable with ≤1000pF capacitance; swing limited to –VS+1.6V / +VS–1.5V at G≥10. |
| 7 (+VS) | Positive Supply Rail | Accepts +2.3V to +18V; independent of –VS rail - supports split or single-supply configurations. |
| 8 (RG) | External Gain Set Resistor Connection | Second terminal of RG; completes gain-setting network; must be tied directly to Pin 1 through resistor only. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-Trimmed Precision | 125µV max input offset voltage and 1µV/°C drift achieved via monolithic trimming - eliminates manual calibration in production test. |
| Single-Resistor Gain Programming | G = 1 + (49.4kΩ/RG) enables rapid gain changes across 4 decades without redesigning feedback networks or layout. |
| High CMRR Across Frequency | 95dB min at G=10 up to 100Hz - preserves signal integrity when amplifying low-level differential signals in presence of 50/60Hz line noise. |
| Robust Input Protection | ±20mA input fault current rating and 13kV HBM ESD tolerance - survives transient overvoltage events in field-deployed sensor interfaces. |
| Wide Supply Range Compatibility | Operates from ±2.3V to ±18V - supports battery-powered portable instruments (±3V) and industrial PLC analog inputs (±15V) with identical part number. |
Applications
| Bridge Amplifiers | Strain Gauge Amplifiers |
|---|---|
|
Use Scenario: Amplifying mV-level differential output from Wheatstone bridge pressure transducers in HVAC and industrial control systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and rail-to-rail output swing referenced to system ground. Use Value: 30ppm nonlinearity at G=10 ensures <0.003% full-scale error in 16-bit ADC systems; 1.3mA supply current enables long-life battery operation. |
Use Scenario: Signal conditioning for metallic foil strain gauges mounted on load cells and structural monitoring sensors. IC Role / Device Role / Timing Role: Low-noise, low-drift amplifier converting microstrain-induced resistance changes into clean voltage outputs. Use Value: 7.5nV/√Hz input noise preserves resolution of sub-1µε measurements; 2nA input bias current avoids errors from high-impedance gauge elements. |
| Thermocouple Amplifiers | Medical Instrumentation |
|
Use Scenario: Cold-junction-compensated amplification of Type K/J thermocouple outputs in furnace and environmental monitoring equipment. IC Role / Device Role / Timing Role: DC-coupled instrumentation amplifier rejecting millivolt-level common-mode noise while preserving thermoelectric EMF accuracy. Use Value: 125µV max input offset and 1µV/°C drift minimize temperature measurement error; REF pin enables direct connection to cold-junction sensor. |
Use Scenario: Biopotential signal acquisition in ECG/EMG front-ends where patient safety and signal fidelity are critical. IC Role / Device Role / Timing Role: Isolated-sensor interface amplifier providing high CMRR, low leakage, and ESD-hardened inputs per IEC 60601-1. Use Value: 13kV HBM ESD rating meets IEC 1000-4-2 Level 4; 200GΩ input resistance prevents loading of dry-electrode interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1167CN8#PBF | Lower input offset (50µV max), higher CMRR (100dB min at G=1), but 2.5mA supply current - 92% higher quiescent power. | Better DC accuracy for lab-grade instruments; less suitable for battery-powered devices due to higher current draw. | Select LT1167CN8#PBF when absolute DC precision outweighs power budget constraints. |
| AD8421ARZ | Higher bandwidth (12MHz vs 12kHz at G=1000), lower noise (3.5nV/√Hz), but requires dual external resistors for gain setting. | Preferred for high-speed dynamic measurements (e.g., vibration analysis); not drop-in compatible due to different pinout and gain architecture. | Choose AD8421ARZ for wideband applications requiring >100kHz bandwidth, accepting added component count and layout revision. |
Compared with LT1920CS8#TRPBF, LT1167CN8#PBF trades power efficiency for superior DC specs, while AD8421ARZ offers bandwidth and noise advantages at the cost of programmability simplicity and pin compatibility - making LT1920CS8#TRPBF optimal for cost-sensitive, low-power, single-resistor-gain industrial sensor nodes.
Availability
LT1920CS8#TRPBF is available at Aetrix Electronics and suitable for bridge amplifiers, strain gauge interfaces, and thermocouple signal conditioning requiring stable component supply across automotive Tier-1, industrial automation, and medical device manufacturing programs.
Supply support for LT1920CS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1920CS8#TRPBF belongs to Linear's precision instrumentation amplifier product line, engineered specifically for low-power, high-accuracy sensor signal conditioning in harsh electromagnetic environments with minimal external components.
FAQ
What is the maximum capacitive load the LT1920CS8#TRPBF can drive without oscillation?
The LT1920CS8#TRPBF is specified to remain stable with capacitive loads up to 1000pF in any gain configuration, as confirmed in the datasheet's Overshoot vs Capacitive Load plot (Figure 1920 G25). This capability eliminates the need for external isolation resistors in most sensor interface designs, simplifying layout and preserving signal integrity for slow-moving industrial signals.
Does the LT1920CS8#TRPBF support single-supply operation, and how is the reference configured?
Yes, the LT1920CS8#TRPBF supports true single-supply operation: the REF pin (Pin 5) can be tied to the negative rail (Pin 4) if the output remains within its specified swing range and one input stays ≥2.5V above ground. In the barometer reference design, RSET sets bridge current and lifts the common-mode voltage, keeping the LT1920CS8#TRPBF output safely within bounds without external level-shifting circuitry.
How does the LT1920CS8#TRPBF achieve low input bias current while maintaining high input impedance?
The LT1920CS8#TRPBF achieves 2nA max input bias current and 200GΩ input resistance using superbeta NPN input transistors fabricated in Linear's proprietary bipolar process. This structure minimizes base current injection while preserving excellent matching - critical for low-offset, high-CMRR performance in precision sensor interfaces where source impedances exceed 100kΩ.
Can the LT1920CS8#TRPBF meet IEC 1000-4-2 Level 4 ESD immunity without external components?
No - the LT1920CS8#TRPBF alone meets 13kV HBM ESD rating, but passing IEC 1000-4-2 Level 4 (8kV contact / 15kV air) requires two external 5kΩ resistors in series with each input (as documented in the datasheet's "Meets IEC 1000-4-2 Level 4" feature bullet and Figure 4). These resistors limit peak current during ESD events and improve coupling immunity without degrading DC accuracy.
What is the gain error temperature coefficient of the LT1920CS8#TRPBF, and how is it specified?
The LT1920CS8#TRPBF has a gain vs temperature coefficient of 20ppm/°C max for G < 1000 (per Electrical Characteristics table, Note 2). This value reflects the combined drift of internal laser-trimmed resistors and transistor parameters - measured over the full –40°C to 85°C industrial temperature range and guaranteed in the I-grade version (LT1920IS8), which LT1920CS8#TRPBF shares core die characteristics with.
LT1920CS8#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:
- 1.2V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 900µA
- Current - Output / Channel:
- 27 mA
- Voltage - Supply Span (Min):
- 4.6 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1920CS8#TRPBF FAQ
1.How can I place an order for LT1920CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1920CS8#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 LT1920CS8#TRPBF reliable?
The price and inventory of LT1920CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1920CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1920CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1920CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1920CS8#TRPBF?
LT1920CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1920CS8#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 LT1920CS8#TRPBF?
For technical support, including LT1920CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1920CS8#TRPBF requirements.
6.How does Aetrix verify that LT1920CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1920CS8#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 LT1920CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1920CS8#TRPBF?
All LT1920CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1920CS8#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 LT1920CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1920CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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