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Analog Devices Inc. LT1990AIS8#PBF
- Part No.:
- LT1990AIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1990AIS8#PBF.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:10,992
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Product details
Overview
LT1990AIS8#PBF from Analog Devices (formerly Linear Technology) is a micropower precision difference amplifier optimized for high common-mode voltage sensing in battery monitoring, current sensing, and industrial signal acquisition. It delivers pin-selectable gain of 1 or 10, ±250V input common-mode range (±15V supply), 70dB min CMRR, 0.28% max gain error (G=1), and rail-to-rail output swing - enabling accurate low-side/high-side voltage and current measurement in noisy, high-voltage systems.
For engineers reviewing the LT1990AIS8#PBF datasheet, LT1990AIS8#PBF pinout, LT1990AIS8#PBF application, or LT1990AIS8#PBF equivalent, this page provides verified technical context, validated pin functions, real-world use cases in battery management and motor control, and two confirmed alternative parts with documented performance trade-offs.
Technical Context
The LT1990AIS8#PBF implements an integrated thin-film resistor-based difference amplifier architecture with internal 27:1 common-mode voltage division, enabling ±250V input range while operating from ±15V supplies. Its reference input (REF) allows additive offset injection, and gain selection is achieved by strapping GAIN1/GAIN2 pins to REF (G=10) or leaving them open (G=1).
Input protection includes ±350V transient tolerance on common-mode inputs and ±500V differential tolerance. The device maintains 100kHz –3dB bandwidth at G=1 and draws ≤120µA supply current at 5V, supporting micropower operation across 2.7V–36V single or ±1.35V–±18V split supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Pin-selectable: 1 (GAIN1/GAIN2 open) or 10 (GAIN1/GAIN2 tied to REF) - enables flexible signal scaling without external resistors. |
| Common-Mode Range | ±250V at ±15V supply - supports direct sensing across high-voltage bus rails without external level-shifting. |
| CMRR | 70dB minimum (LT1990A grade) - ensures rejection of noise-coupled common-mode interference in motor drives and power converters. |
| Gain Error | 0.28% maximum at G=1, 25°C - guarantees accuracy in precision current shunt monitoring where <0.5% total error is required. |
| Supply Current | 120µA maximum at 5V - enables always-on battery cell voltage monitoring in multi-cell packs with minimal self-discharge impact. |
| Input Impedance | 2MΩ differential, 500kΩ common-mode - minimizes loading on high-impedance sensor nodes and legacy analog front-ends. |
| Bandwidth | 100kHz at G=1 - sufficient for DC–10kHz current/voltage transients in motor phase current sensing and UPS monitoring. |
Pinout & Package
LT1990AIS8#PBF is housed in an 8-pin SOIC (S8) package with standard JEDEC MS-012AC dimensions (4.9mm × 3.9mm, 1.27mm pitch). The package is RoHS-compliant and lead-free (PBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | Reference Input | Sets output zero-point offset; connects to stable voltage source (e.g., 1.25V or 2.5V reference) to shift output baseline - critical for unipolar ADC interfacing. |
| –IN (Pin 2) | Inverting Input | High-impedance node (1MΩ internal series resistor) for connecting to high-side or low-side shunt monitor points - withstands ±350V transients. |
| +IN (Pin 3) | Noninverting Input | High-impedance node (1MΩ internal series resistor) for complementary shunt connection - matched to –IN for CMRR preservation. |
| V– (Pin 4) | Negative Supply | Ground (single-supply) or negative rail (split-supply); defines lower bound of output swing and common-mode compliance. |
| GAIN2 (Pin 5) | Gain Configuration | Used with GAIN1 to select G=10 when tied to REF; left open for G=1 - no external components needed for basic gain setup. |
| OUT (Pin 6) | Amplified Output | Rail-to-rail output capable of driving 10kΩ loads directly into ADCs or comparators - eliminates need for output buffer stages. |
| V+ (Pin 7) | Positive Supply | Accepts 2.7V–36V single supply or +1.35V–+18V positive rail in split-supply mode - supports wide-range industrial power domains. |
| GAIN1 (Pin 8) | Gain Configuration | Paired with GAIN2 to enable G=10; open for G=1 - identical function to Pin 5; both must be strapped together and to REF for gain selection. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 120µA max supply current enables continuous battery cell monitoring in energy-constrained BMS applications without compromising runtime. |
| Fault-Protected Inputs | Withstands ±350V common-mode transients and ±500V differential overvoltage - eliminates need for external TVS or clamping diodes in harsh EMI environments. |
| Adjustable Common-Mode Range | VREF selection tailors input window (e.g., –5V to 80V at 5V supply with VREF = 1.25V) - supports automotive 42V and telecom –77V to +8V signaling. |
| Precision Thin-Film Resistors | On-chip laser-trimmed network achieves 0.28% gain error and <10ppm/°C gain drift - replaces discrete resistor networks requiring manual matching and calibration. |
| Rail-to-Rail Output | Delivers full dynamic range down to 30mV above V– and within 120mV of V+ at 5V - maximizes resolution when interfacing with 12-bit+ SAR ADCs. |
Applications
| Battery Cell Voltage Monitoring | High-Side Current Sensing |
|---|---|
Use Scenario: Monitoring individual cell voltages in 12–24S 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 potential (up to ±250V). Use Value: Enables accurate state-of-charge estimation using only one LT1990AIS8#PBF per cell, reducing component count vs. isolated amplifiers or optocoupler-based solutions. | Use Scenario: Measuring motor phase current in industrial inverters using shunt resistors placed between IGBTs and DC bus. IC Role / Device Role / Timing Role: High-common-mode difference amplifier capturing fast current transients (≤100kHz) while rejecting switching noise from adjacent power stages. Use Value: Delivers 70dB CMRR and 100kHz bandwidth to resolve true RMS current under PWM commutation, improving torque control fidelity. |
| Industrial Power Supply Monitoring | Noise-Immune Signal Acquisition |
Use Scenario: Real-time monitoring of output voltage and current in programmable DC power supplies and lab bench instruments. IC Role / Device Role / Timing Role: Dual-role amplifier: G=1 for voltage sense (high-Z), G=10 for current sense (low-Vshunt), sharing same VREF and supply rails. Use Value: Single-chip solution reduces PCB area and inter-stage errors versus separate op-amp + instrumentation amp designs. | Use Scenario: Acquiring analog sensor signals (e.g., strain gauges, RTDs) in factory automation equipment exposed to variable-frequency drive noise. IC Role / Device Role / Timing Role: Front-end difference amplifier rejecting common-mode EMI coupled onto long sensor cables via shielded twisted-pair wiring. Use Value: 2MΩ input impedance prevents signal attenuation on high-Z sensors, while 70dB CMRR suppresses >60dB of conducted noise without external filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA149IDR | Fixed G=100, ±200V common-mode range, 125µA supply current, 200kHz bandwidth | Higher gain but narrower input range; better for low-Vshunt (<10mV) sensing; less flexible for dual-gain system design | Select when fixed high gain and higher bandwidth outweigh need for G=1 flexibility and extended ±250V range. |
| AD8479ARZ | Fixed G=1, ±600V common-mode range, 700µA supply current, 200kHz bandwidth, 100dB CMRR | Superior CMRR and voltage range but 6× higher quiescent current; requires external VREF buffering | Select when ultra-high CMRR (>90dB) and >±250V range are mandatory, and micropower operation is secondary. |
Compared with INA149IDR and AD8479ARZ, the LT1990AIS8#PBF uniquely balances pin-selectable gain, ±250V capability, and 120µA micropower consumption - making it optimal for cost-sensitive, space-constrained, and battery-backed high-voltage monitoring where gain adaptability matters.
Availability
LT1990AIS8#PBF is available at Aetrix Electronics and suitable for battery management systems, industrial motor control, and programmable power supply monitoring requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance (–40°C to 85°C).
Supply support for LT1990AIS8#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 LT1990AIS8#PBF belongs to ADI's precision signal conditioning portfolio, designed specifically for high-common-mode-voltage measurement in safety-critical and energy-efficient systems where accuracy, robustness, and low power are non-negotiable.
FAQ
What is the guaranteed common-mode input voltage range for LT1990AIS8#PBF at ±15V supply?
The LT1990AIS8#PBF guarantees ±250V common-mode input voltage range when operated from ±15V supplies, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This range is enabled by its internal 27:1 common-mode divider architecture and is validated across the full –40°C to 85°C industrial temperature range.
How does LT1990AIS8#PBF achieve pin-selectable gain of 1 or 10?
The LT1990AIS8#PBF uses internal thin-film resistor networks controlled by Pins 5 (GAIN2) and 8 (GAIN1). When both pins are left open, the device operates at G=1. When both pins are connected to the REF pin (Pin 1), gain is set to G=10. No external resistors are required - the configuration is purely strapping-based and fully specified in the datasheet.
What is the maximum supply voltage for LT1990AIS8#PBF, and how does it affect input range?
The LT1990AIS8#PBF supports total supply voltage up to 36V (single supply) or ±18V (split supply). At ±15V, the full ±250V common-mode range is achievable. At lower supplies (e.g., +5V/0V), the input range becomes adjustable via VREF selection - for example, –5V to +80V with VREF = 1.25V - allowing optimization for automotive or telecom applications.
Does LT1990AIS8#PBF require external input protection components?
No, the LT1990AIS8#PBF integrates robust input protection: ±350V common-mode and ±500V differential transient tolerance are built-in. External TVS diodes or series resistors are unnecessary for standard overvoltage conditions, simplifying layout and improving reliability in high-noise industrial environments.
What is the typical supply current of LT1990AIS8#PBF at 5V single supply and 25°C?
The LT1990AIS8#PBF draws ≤120µA supply current at 5V single supply and 25°C, with typical value around 105µA. This micropower characteristic is maintained across the full –40°C to 85°C operating range, making it ideal for always-on battery monitoring and low-duty-cycle sensing applications.
LT1990AIS8#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:
- 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#PBF FAQ
1.How can I place an order for LT1990AIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1990AIS8#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 LT1990AIS8#PBF reliable?
The price and inventory of LT1990AIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1990AIS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1990AIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1990AIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1990AIS8#PBF?
LT1990AIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1990AIS8#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 LT1990AIS8#PBF?
For technical support, including LT1990AIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1990AIS8#PBF requirements.
6.How does Aetrix verify that LT1990AIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1990AIS8#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 LT1990AIS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1990AIS8#PBF?
All LT1990AIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1990AIS8#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 LT1990AIS8#PBF part is unused and in its original packaging.
Return procedure for LT1990AIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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