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Analog Devices Inc. LT1990AHS8#PBF
- Part No.:
- LT1990AHS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1990AHS8#PBF.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,637
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Product details
Overview
LT1990AHS8#PBF from Analog Devices (formerly Linear Technology) is a micropower precision difference amplifier optimized for high common-mode voltage monitoring in battery management, industrial power supplies, and motor control. 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 signal extraction from noisy high-voltage nodes.
For engineers reviewing the LT1990AHS8#PBF datasheet, LT1990AHS8#PBF pinout, LT1990AHS8#PBF application, or LT1990AHS8#PBF equivalent, this page provides verified functional context, validated pin-level circuit roles, confirmed high-side/low-side current sensing use cases, and manufacturer-validated alternative options for ±250V CMV monitoring designs.
Technical Context
The LT1990AHS8#PBF implements an integrated thin-film resistor-based modified difference amplifier topology with internal 27:1 common-mode voltage division, enabling ±250V operation on ±15V supplies. Its REF pin allows additive offset injection, while GAIN1/GAIN2 pins configure gain without external components.
It features fault protection to ±350V transient common-mode and ±500V differential inputs, operates from –40°C to +125°C (H-grade), and maintains 70dB CMRR across –250V to +250V VCM at ±15V supply - critical for isolated sensing in automotive and industrial inverters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Pin-selectable 1 or 10 - enables direct scaling of shunt voltage without external resistors |
| Common-Mode Range | ±250V at ±15V supply - supports full-range monitoring of 400V bus systems with local ±15V rails |
| CMRR | 70dB min (RTI) - rejects >90% of common-mode noise in high-dV/dt motor drive environments |
| Supply Current | 120µA max - enables always-on battery cell monitoring with minimal self-heating |
| Input Impedance | 2MΩ differential / 500kΩ common-mode - minimizes loading on high-impedance voltage dividers |
| Bandwidth | 100kHz at G=1 - captures fast transients in overcurrent detection circuits |
| Output Swing | Rail-to-rail - maximizes dynamic range on single 3V–5V supplies for ADC interfacing |
Pinout & Package
LT1990AHS8#PBF is housed in an 8-pin SOIC (S8) package with standard JEDEC MS-012AC footprint, 1.27mm pitch, and 5.0mm × 6.2mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | Reference Input | Sets output DC level when ΔVIN = 0; must be driven from ≤5Ω source to preserve accuracy |
| –IN (Pin 2) | Inverting Input | High-impedance node (1MΩ internal R) for connection to high-side shunt or voltage divider |
| +IN (Pin 3) | Noninverting Input | High-impedance node (1MΩ internal R) for low-side sensing or differential signal acquisition |
| V– (Pin 4) | Negative Supply | Ground in single-supply configs; negative rail in split-supply systems (e.g., –15V) |
| GAIN2 (Pin 5) | Gain Configuration | Connect to REF and GAIN1 for G=10; open for G=1 - no external pull-up/down required |
| OUT (Pin 6) | Amplified Output | Rail-to-rail output driving ADCs, comparators, or isolation interfaces directly |
| V+ (Pin 7) | Positive Supply | Accepts 2.7V–36V above V– - enables wide-input-range operation from 3V logic to 36V industrial rails |
| GAIN1 (Pin 8) | Gain Configuration | Connect to REF and GAIN2 for G=10; open for G=1 - forms matched pair with Pin 5 |
Key Features
| Feature | Design Value |
|---|---|
| ±350V Fault-Protected Inputs | Withstands transient overvoltages beyond system bus rating - eliminates need for external TVS clamping |
| 0.28% Max Gain Error (G=1) | Enables <1% total current measurement error in shunt-based BMS without calibration |
| 120µA Max Supply Current | Supports continuous monitoring in energy-constrained applications like wireless sensor nodes |
| ±250V Common-Mode Range | Directly interfaces to 400V EV battery stacks or 600V industrial DC links without isolation |
| –40°C to +125°C Operation | Validated performance across automotive under-hood and industrial motor drive thermal profiles |
Applications
| Battery Cell Voltage Monitoring | High-Side Current Sensing |
|---|---|
Use Scenario: Monitoring individual cell voltages in a 96-cell lithium-ion EV battery pack with 400V nominal bus. IC Role / Device Role / Timing Role: Precision difference amplifier extracting mV-level cell voltage differentials against ±250V common-mode background. Use Value: Enables accurate state-of-charge estimation without optical isolation, reducing BOM cost by >30% versus isolated amplifier solutions. | Use Scenario: Measuring phase current in a 3-phase IGBT inverter driving a 400V AC induction motor. IC Role / Device Role / Timing Role: High-side shunt amplifier rejecting 400V common-mode switching noise during PWM transitions. Use Value: Delivers 100kHz bandwidth and 70dB CMRR to capture fast overcurrent events before IGBT destruction. |
| Isolated Power Supply Feedback | Noisy Industrial Signal Acquisition |
Use Scenario: Providing precise secondary-side voltage feedback to primary-side controller in a 1kW telecom PSU. IC Role / Device Role / Timing Role: Difference amplifier referenced to isolated ground, rejecting ground loop noise between primary and secondary domains. Use Value: Eliminates optocoupler drift and aging issues while maintaining <0.5% regulation accuracy over temperature. | Use Scenario: Acquiring analog sensor signals (e.g., pressure, temperature) near variable-frequency drives in factory automation. IC Role / Device Role / Timing Role: Front-end signal conditioner rejecting >100V/µs dV/dt noise coupled onto sensor cables. Use Value: Maintains 2MΩ input impedance and 70dB CMRR to prevent false triggers in safety-critical PLC inputs. |
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, ±270V CMV, 100dB CMRR, 1.2mA supply current | Higher gain and CMRR but 10× higher power - suited for precision lab equipment, not battery-powered systems | Select when ultra-high CMRR and fixed high gain outweigh micropower requirements |
| AD8479ARZ | Fixed G=1, ±600V CMV, 86dB CMRR, 1.5mA supply current, wider –40°C to +125°C spec | Higher voltage rating and better CMRR, but lacks pin-selectable gain and rail-to-rail output | Select when monitoring >400V systems where G=1 suffices and output headroom is less critical |
Compared with INA149IDR and AD8479ARZ, the LT1990AHS8#PBF uniquely balances ±250V capability, dual-gain flexibility, 120µA micropower operation, and rail-to-rail output - making it optimal for space- and energy-constrained high-voltage monitoring where configurability matters.
Availability
LT1990AHS8#PBF is available at Aetrix Electronics and suitable for battery management systems, industrial motor drives, and telecom power supplies requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT1990AHS8#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1990 product line delivers precision, high-voltage difference amplifiers for current and voltage monitoring in harsh electrical environments - designed specifically for reliability in automotive battery packs and industrial power conversion.
FAQ
What is the maximum common-mode voltage the LT1990AHS8#PBF supports?
The LT1990AHS8#PBF supports a guaranteed ±250V input common-mode voltage range when operated on ±15V supplies. This is validated across the full –40°C to +125°C temperature range per its H-grade specification. At single 5V supply, the usable common-mode window is reduced to 85V (e.g., –5V to +80V), as defined by CMRR performance limits.
How do I configure the LT1990AHS8#PBF for gain of 10?
To configure the LT1990AHS8#PBF for gain of 10, connect both GAIN1 (Pin 8) and GAIN2 (Pin 5) to the REF pin (Pin 1). No external resistors or pull-ups are needed. For gain of 1, leave both GAIN1 and GAIN2 pins unconnected (open). The LT1990AHS8#PBF internally routes these pins to set the resistor network ratio.
Does the LT1990AHS8#PBF require external protection diodes?
No, the LT1990AHS8#PBF does not require external protection diodes. Its inputs are fault-protected to ±350V common-mode transients and ±500V differential voltage, as specified in the Absolute Maximum Ratings. This internal protection eliminates the need for discrete TVS or series current-limiting resistors in most high-voltage monitoring applications.
What is the typical supply current of the LT1990AHS8#PBF at 25°C?
The typical supply current of the LT1990AHS8#PBF is 120µA at 25°C and ±15V supply, with a maximum of 120µA across the full operating temperature range. At single 5V supply, typical current remains ≤120µA, supporting ultra-low-power always-on monitoring in battery-backed systems.
Can the LT1990AHS8#PBF operate from a single 3V supply?
Yes, the LT1990AHS8#PBF operates from a single 3V supply (V+ = 3V, V– = 0V), delivering rail-to-rail output swing and maintaining 70dB CMRR within its specified common-mode input range (e.g., –5V to +25V with VREF = 1.25V). Its minimum supply voltage is 2.7V, making it compatible with modern low-voltage microcontroller domains.
LT1990AHS8#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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1990AHS8#PBF FAQ
1.How can I place an order for LT1990AHS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1990AHS8#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 LT1990AHS8#PBF reliable?
The price and inventory of LT1990AHS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1990AHS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1990AHS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1990AHS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1990AHS8#PBF?
LT1990AHS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1990AHS8#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 LT1990AHS8#PBF?
For technical support, including LT1990AHS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1990AHS8#PBF requirements.
6.How does Aetrix verify that LT1990AHS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1990AHS8#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 LT1990AHS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1990AHS8#PBF?
All LT1990AHS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1990AHS8#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 LT1990AHS8#PBF part is unused and in its original packaging.
Return procedure for LT1990AHS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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