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Analog Devices Inc. LT1990AIS8#TRPBF
- Part No.:
- LT1990AIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1990AIS8#TRPBF.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:12,124
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Product details
Overview
LT1990AIS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower precision difference amplifier optimized for high common-mode voltage sensing in industrial and automotive systems. It delivers pin-selectable gains of 1 or 10, supports ±250V input common-mode range on ±15V supplies, achieves ≥70dB CMRR, and draws ≤120µA supply current - enabling accurate current/voltage monitoring in battery cell stacks, motor drives, and isolated power supplies.
For engineers reviewing the LT1990AIS8#TRPBF datasheet, LT1990AIS8#TRPBF pinout, LT1990AIS8#TRPBF application, or LT1990AIS8#TRPBF equivalent, this page provides verified specifications, validated pin functions, real-world use cases in high-side current sensing and noisy signal acquisition, and confirmed alternative options for design flexibility and supply continuity.
Technical Context
The LT1990AIS8#TRPBF implements an integrated thin-film resistor-based difference amplifier with internal 27:1 common-mode voltage division, enabling ±250V operation while powered from ±15V rails. Its rail-to-rail output stage maximizes dynamic range on low-voltage single supplies down to 2.7V.
Gain selection is implemented via external connection of Pins 5 (GAIN2) and 8 (GAIN1) to REF (Pin 1), configuring G = 10; open-circuit pins yield G = 1. Input protection withstands ±350V transients and ±500V differential inputs, supporting fault-protected front-end designs in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Pin-selectable 1 or 10 - enables scalable signal conditioning without external gain-setting resistors. |
| Common-Mode Range | ±250V at ±15V supply - allows direct sensing across high-voltage bus segments without external level-shifting. |
| CMRR | ≥70dB (min) - ensures rejection of noise coupled equally to both inputs in electrically noisy motor or power-conversion systems. |
| Supply Current | ≤120µA - supports always-on battery monitoring and low-power IoT edge nodes. |
| Input Impedance | 2MΩ differential / 500kΩ common-mode - minimizes loading on high-impedance sensor sources and shunt resistors. |
| Bandwidth | 100kHz at G = 1 - sufficient for DC–10kHz current loop feedback and battery cell voltage tracking. |
| Gain Error | ≤0.28% (max) at G = 1 - guarantees accuracy within 2.8mV over full-scale output for precision instrumentation. |
Pinout & Package
LT1990AIS8#TRPBF is housed in an 8-pin SOIC (SO-8) package with standard 1.27mm pitch, RoHS-compliant, and rated for –40°C to +85°C industrial operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (1) | Reference Input | Sets output zero point; connects to system ground, mid-supply, or external reference to shift output baseline. |
| –IN (2) | Inverting Input | High-impedance node (1MΩ internal resistor) for connecting to high-side or low-side shunt voltage. |
| +IN (3) | Noninverting Input | High-impedance node (1MΩ internal resistor); paired with –IN to form differential input pair. |
| V– (4) | Negative Supply | Accepts ground (single-supply) or negative rail (split-supply); defines lower supply boundary. |
| GAIN2 (5) | Gain Configuration | Connected to REF and GAIN1 to select G = 10; left open for G = 1. |
| OUT (6) | Amplified Output | Rail-to-rail output capable of swinging within 30mV of V– and 120mV of V+ on 5V supply. |
| V+ (7) | Positive Supply | Supports 2.7V to 36V above V– - enables wide-input-range operation from 3V logic to 36V industrial rails. |
| GAIN1 (8) | Gain Configuration | Connected to REF and GAIN2 to select G = 10; left open for G = 1. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 120µA max supply current enables multi-year battery life in portable diagnostics and BMS modules. |
| Fault-Protected Inputs | Withstands ±350V common-mode transients and ±500V differential overvoltage - eliminates need for external clamping diodes in EV traction inverters. |
| Pin-Selectable Gain | No external resistors required for G = 1 or G = 10 - reduces BOM count and layout complexity in production designs. |
| Rail-to-Rail Output | Delivers full dynamic range on 2.7V single supply - critical for low-voltage microcontroller ADC interfacing without level-shifting. |
| High Input Impedance | 2MΩ differential input resistance prevents loading of precision shunt resistors (e.g., 1mΩ–10mΩ) used in high-current sensing. |
Applications
| Battery Cell Voltage Monitoring | High Voltage Current Sensing |
|---|---|
Use Scenario: Monitoring individual cell voltages in 48V–800V lithium-ion battery packs for electric vehicles and energy storage systems. IC Role / Device Role / Timing Role: Precision difference amplifier measuring mV-level cell voltage differences against high common-mode bus voltage. Use Value: Enables accurate state-of-charge estimation with ≤0.28% gain error and ±350V transient immunity - reducing risk of thermal runaway due to undetected cell imbalance. | Use Scenario: Measuring motor phase current in industrial servo drives operating from 400V AC mains. IC Role / Device Role / Timing Role: High-side current sense amplifier converting shunt voltage to ground-referenced output for MCU ADC sampling. Use Value: Supports ±250V common-mode range and 100kHz bandwidth - capturing fast current transients during PWM switching without distortion or saturation. |
| Signal Acquisition in Noisy Environments | Fault Protected Front Ends |
Use Scenario: Extracting analog sensor signals (e.g., pressure, temperature) in proximity to variable-frequency drives and arc welders. IC Role / Device Role / Timing Role: Differential front-end amplifier rejecting EMI/RFI coupled equally onto signal lines. Use Value: 70dB minimum CMRR suppresses 99.7% of common-mode noise - improving SNR by >20dB compared to op-amp-based discrete solutions. | Use Scenario: Protecting downstream ADCs and controllers in photovoltaic string monitors exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Robust input stage absorbing ±350V transients before they reach sensitive circuitry. Use Value: Eliminates need for external TVS diodes and series resistors - reducing component count, PCB area, and failure points in outdoor-rated equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | Fixed G = 20, higher bandwidth (400kHz), higher supply current (2.4mA), AEC-Q100 qualified | Better suited for automotive motor control requiring faster response; not pin-compatible | Select when automotive qualification and higher speed outweigh micropower requirements. |
| AD8479ARZ | Fixed G = 1, wider CM range (±600V), higher offset (±200µV), higher supply current (700µA) | Preferred for ultra-high-voltage isolation (e.g., grid-tied inverters); requires external gain stage for scaling | Select when ±600V common-mode capability is mandatory and power budget permits. |
Compared with INA240A1QDRQ1 and AD8479ARZ, the LT1990AIS8#TRPBF uniquely balances micropower operation (120µA), pin-selectable gain, and ±250V capability - making it optimal for cost-sensitive, battery-powered, and industrial BMS designs where moderate bandwidth suffices.
Availability
LT1990AIS8#TRPBF is available at Aetrix Electronics and suitable for battery management systems, industrial motor drives, and photovoltaic monitoring requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for LT1990AIS8#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 LT1990 product line was developed by Linear Technology (acquired by ADI in 2017) to address precision high-common-mode-voltage signal conditioning - specifically targeting current sensing, battery monitoring, and isolated measurement in space- and power-constrained systems.
FAQ
What is the maximum common-mode input voltage supported by the LT1990AIS8#TRPBF?
The LT1990AIS8#TRPBF supports a guaranteed ±250V common-mode input voltage range when operated from ±15V supplies. On single 5V supplies, its common-mode range is adjustable up to 85V depending on reference voltage configuration - verified per datasheet Section "Input Voltage Range vs Single Supply Voltage" and Absolute Maximum Ratings table.
Does the LT1990AIS8#TRPBF require external resistors to set gain?
No, the LT1990AIS8#TRPBF does not require external resistors to set gain. It features internal thin-film resistors and pin-strappable gain selection: leaving Pins 5 (GAIN2) and 8 (GAIN1) open yields G = 1; connecting both to Pin 1 (REF) configures G = 10 - confirmed in the "Features" and "Applications Information" sections of the LT1990 datasheet.
What is the operating temperature range for the LT1990AIS8#TRPBF?
The LT1990AIS8#TRPBF is specified for industrial operation from –40°C to +85°C. This is indicated by the "I" suffix in the part number (LT1990AIS8) and confirmed in the "Order Information" and "Electrical Characteristics" tables of the official datasheet.
Can the LT1990AIS8#TRPBF be used with a single 3.3V supply?
Yes, the LT1990AIS8#TRPBF operates from a single 3.3V supply (V+ = 3.3V, V– = 0V), delivering rail-to-rail output swing and ≤120µA supply current. Its minimum supply voltage is 2.7V, and input common-mode range is configurable down to –5V to 25V using VREF = 1.25V - validated in the "3V/5V Electrical Characteristics" section.
How does the LT1990AIS8#TRPBF handle input overvoltage conditions?
The LT1990AIS8#TRPBF incorporates robust input protection rated for ±350V common-mode transients and ±500V differential overvoltage. This is achieved via internal clamping structures and high-voltage input resistors - eliminating need for external protection components in most industrial and automotive applications, as documented in the "Absolute Maximum Ratings" and "Features" sections.
LT1990AIS8#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:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.55V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 105 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 900 µV
- Current - Supply:
- 140µA
- Current - Output / Channel:
- 22 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1990AIS8#TRPBF FAQ
1.How can I place an order for LT1990AIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1990AIS8#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 LT1990AIS8#TRPBF reliable?
The price and inventory of LT1990AIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1990AIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1990AIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1990AIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1990AIS8#TRPBF?
LT1990AIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1990AIS8#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 LT1990AIS8#TRPBF?
For technical support, including LT1990AIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1990AIS8#TRPBF requirements.
6.How does Aetrix verify that LT1990AIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1990AIS8#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 LT1990AIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1990AIS8#TRPBF?
All LT1990AIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1990AIS8#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 LT1990AIS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1990AIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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