LT1990HS8#PBF Analog Devices Integrated Circuit (Small Outline Packages) In Stock
Analog Devices LT1990 precision difference amplifier in 8-pin SOIC package, rated for ±250V common-mode input voltages. Delivers 7.4 µV maximum input offset voltage and 68 dB typical CMRR for high-voltage differential signal measurement. Available in lead-free version with worldwide distribution for industrial and test applications.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LT1990HS8#PBF Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- ±250V common-mode input voltage rating for direct high-voltage rail differential measurement
- 7.4 µV maximum input offset voltage ensuring precision in millivolt-level signal conditioning
- 68 dB typical CMRR (60 dB minimum) for effective common-mode noise rejection
- 8-pin SOIC package enabling space-efficient high-voltage difference amplifier PCB integration
Applications
The LT1990HS8 is designed for high-voltage differential measurement applications where the common-mode voltage may swing from -250V to +250V relative to circuit ground, such as motor drive current sensing, power supply output monitoring, and high-side current measurement on 100V to 200V industrial bus systems. Its precision 7.4 µV offset enables accurate measurement of small differential signals superimposed on large common-mode voltages without requiring a separate isolation amplifier. It is also used in automated test equipment and battery formation systems where cell voltages must be measured relative to a high-voltage stack reference.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1610 (S8) |
| YTEOL | 10 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | VOLTAGE-FEEDBACK |
| Common-mode Reject Ratio-Min | 60dB |
| Common-mode Reject Ratio-Nom | 68dB |
| Frequency Compensation | YES |
| Input Offset Voltage-Max | 7.4 µV |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e3 |
| Low-Offset | YES |
| Micropower | YES |
| Neg Supply Voltage Limit-Max | -18 V |
| Neg Supply Voltage-Nom (Vsup) | -15 V |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Power | NO |
| Programmable Power | YES |
| Qualification Status | Not Qualified |
| Slew Rate-Min | 0.3V/us |
| Slew Rate-Nom | 0.55V/us |
| Supply Current-Max | 0.18mA |
| Supply Voltage Limit-Max | 18V |
| Supply Voltage-Nom (Vsup) | 15V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Unity Gain BW-Nom | 105 |
| Wideband | NO |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What common-mode voltage range does LT1990HS8 support and why is this critical for motor drive current sensing?
The LT1990HS8 supports common-mode input voltages from -250V to +250V, allowing it to measure shunt resistor voltage drops directly on high-voltage DC bus rails without isolation. In a 150V DC motor drive, the shunt sits at bus potential while the amplifier output references low-voltage control ground, eliminating the need for an optocoupler or transformer-based isolation stage and reducing BOM cost by several components in high-side current feedback loops.
How does the 7.4 µV maximum offset voltage of LT1990HS8 affect measurement accuracy in a 1mΩ shunt current sensor?
With a maximum offset of 7.4 µV and a 1mΩ shunt, the LT1990HS8 introduces a worst-case current measurement error of 7.4 mA, regardless of the common-mode voltage across the full ±250V range. For a 10A full-scale current sensor this represents less than 0.1% error, enabling 12-bit accurate current measurement directly at the power device without additional error correction firmware or trimming in production.
In what industrial applications is LT1990HS8 more practical than a galvanically isolated amplifier for high-side sensing?
LT1990HS8 replaces galvanic isolation in applications where the bus voltage stays within ±250V and input-to-output creepage requirements do not mandate full galvanic isolation per IEC 61010. Industrial power supplies up to 200V output, 3-phase inverter DC link sensing, and battery management systems with cell stacks up to 200V benefit from LT1990's direct high-voltage difference amplifier approach, which provides single-pole settling below 10 µs rather than the hundreds of microseconds typical for magnetically isolated solutions.
What PCB layout considerations are important when using the LT1990HS8 8-pin SOIC package at ±250V common-mode inputs?
At ±250V common mode, the LT1990HS8 requires PCB creepage and clearance of at least 4mm between the high-voltage input pins and any low-voltage signal or ground traces to meet IEC 60950 and IEC 61010 basic insulation requirements. The 8-pin SOIC body is approximately 5mm x 4mm, so input resistor networks should be placed with conformal coating in mind. A 100 nF ceramic bypass capacitor on the 5V supply pin within 5mm of the IC is sufficient for stable operation in noisy motor drive environments.
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