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Analog Devices Inc. LT1997HMS-1#PBF
- Part No.:
- LT1997HMS-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT1997HMS-1#PBF.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
LT1997HMS-1#PBF from Analog Devices is a precision, high-voltage, gain-selectable difference amplifier optimized for bidirectional current sensing in industrial power systems. It integrates a matched resistor network and precision op amp to deliver 0.012% gain error (G=10), 109dB CMRR, and operation with input common-mode voltages up to V– + 76V - enabling robust high-side sensing in ±15V or single-supply 3.3V–50V systems.
For engineers reviewing the LT1997HMS-1#PBF datasheet, LT1997HMS-1#PBF pinout, LT1997HMS-1#PBF application, or LT1997HMS-1#PBF equivalent, key selection criteria include guaranteed –40°C to +125°C operation, pin-selectable gains of 10/20/50, rail-to-rail output swing, 350µA supply current, and MSOP-16 package compatibility with high-density PCB layouts.
Technical Context
The LT1997HMS-1#PBF implements a fully integrated difference amplifier architecture with three dedicated noninverting and inverting input pairs (+INA/–INA, +INB/–INB, +INC/–INC) that connect to internal precision resistors (15kΩ, 7.5kΩ, 3kΩ) to set gains of 10, 20, and 50 respectively. Its internal op amp operates in both normal and Over-The-Top® modes, supporting common-mode inputs up to V– + 76V independent of V+.
Gain configuration is achieved by connecting signal sources to specific input pins - no external components required. The device includes a shutdown pin (SHDN) referenced to V+, enabling 20µA low-power mode, and dual reference inputs (REF1/REF2 in MSOP package) for precise output level translation during zero-differential conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | Pin-selectable 10, 20, 50 - enables accurate current sense scaling without external resistors |
| CMRR (G=10) | ≥109dB - rejects >99.99999% of common-mode noise in high-noise motor drives or inverters |
| Input CM Range | V– to V– + 76V - supports direct high-side sensing in 48V, 60V, or telecom power rails |
| Gain Error (G=10) | ±0.012% max - ensures <1.2mV error at 10V output for precision shunt-based measurements |
| Supply Voltage | 3.3V to 50V - operates from low-voltage microcontrollers to high-voltage industrial supplies |
| Quiescent Current | 350µA active / 20µA shutdown - enables always-on monitoring with ultra-low standby power |
| Bandwidth (G=10) | 650kHz - supports fast transient detection in overcurrent protection circuits |
| Temp Range | –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and solar inverter use |
Pinout & Package
LT1997HMS-1#PBF is housed in a 16-lead plastic MSOP package (MS16 variation), 4.0mm × 3.0mm footprint, 0.65mm pitch, with exposed pad connected to V– for thermal performance. Pin 15 is not present; V– is on Pin 8.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| +INA | Noninverting input (G=10) | Connects to 15kΩ resistor; used for 10× differential amplification |
| +INB | Noninverting input (G=20) | Connects to 7.5kΩ resistor; enables 20× gain with same layout |
| +INC | Noninverting input (G=50) | Connects to 3kΩ resistor; provides highest sensitivity for low-current sensing |
| –INA, –INB, –INC | Inverting inputs (G=10/20/50) | Matched counterparts to noninverting pins; define differential pair for each gain |
| REF1 / REF2 | Reference divider inputs | Set output DC level when differential input = 0; enable offset calibration |
| SHDN | Shutdown control | Active-high logic (referred to V+); pulls ≥2.5V below V+ to enter 20µA sleep mode |
| OUT | Analog output | Rail-to-rail swing; drives 10kΩ load with <150mV headroom at V– and V+ |
| V+ / V– | Power supply terminals | Support asymmetric supplies (e.g., +15V/–5V); V– connects to exposed pad for thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| Matched resistor network | Guaranteed <1ppm/°C gain drift and <2ppm nonlinearity - eliminates external trimming in production |
| Over-The-Top® input stage | Operates with VCM up to V– + 76V even when V+ is low - enables high-side sensing with 3.3V MCU interface |
| Three-gain flexibility | Single footprint supports 10/20/50× via input pin routing - reduces BOM count and layout variants |
| Low-noise precision core | 65µV max offset, 31nV/√Hz input noise at G=10 - preserves SNR in µΩ shunt applications |
| Industrial temperature grade | Full specifications guaranteed from –40°C to +125°C - no derating needed for harsh environments |
| RoHS-compliant packaging | Lead-free MSOP-16 with JEDEC-standard moisture sensitivity level (MSL 1) |
Applications
| High-Side Current Monitoring | Bidirectional Motor Control |
|---|---|
Use Scenario: Real-time phase current measurement in 3-phase BLDC inverter stacks using 1mΩ shunts at 48V bus. IC Role / Device Role / Timing Role: Difference amplifier conditioning shunt voltage with 76V common-mode rejection and 10× gain before ADC sampling. Use Value: Enables accurate torque control and overcurrent shutdown within 6.3µs settling time at 0.1% accuracy. | Use Scenario: Bidirectional current feedback in H-bridge servo drivers for robotics and CNC axes. IC Role / Device Role / Timing Role: Amplifies differential voltage across bidirectional shunt with polarity-preserving output referenced to system ground. Use Value: Delivers <±2ppm gain nonlinearity and 109dB CMRR to maintain closed-loop stability under EMI-rich motor commutation. |
| Industrial Data-Acquisition Front-End | High-Voltage Level Translation |
Use Scenario: Isolation-free analog input module for programmable logic controllers measuring 0–10A across 24–60V DC distribution lines. IC Role / Device Role / Timing Role: Precision difference amplifier with REF1/REF2 biasing to shift output into 0–5V ADC range. Use Value: Eliminates optocoupler or isolated amplifier cost while maintaining 0.012% gain accuracy over full temperature range. | Use Scenario: Converting ±15V sensor outputs (e.g., strain gauges, RTDs) to 0–3.3V for low-voltage SAR ADCs. IC Role / Device Role / Timing Role: High-CMRR difference amplifier acting as level-shifting buffer with user-defined output offset. Use Value: Achieves 114dB PSRR and rail-to-rail output swing to maximize dynamic range without external op amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | Fixed gain (20V/V), lower CMRR (120dB typ), 2.7–5.5V supply only, SOIC-8 package | Optimized for low-voltage battery-powered current sensing; lacks 76V CM range and multi-gain flexibility | Select for cost-sensitive, single-gain, low-voltage designs where extended common-mode range is unnecessary |
| AD8479ARZ | Fixed gain (1V/V), higher CMRR (120dB min), ±500V isolation rating, SOIC-8, no shutdown | Designed for ultra-high common-mode rejection in medical/safety-critical systems; no gain selectability or low-power mode | Select when absolute CMRR >115dB and safety-rated isolation are mandatory, and gain of unity suffices |
Compared with INA240A1IDR and AD8479ARZ, LT1997HMS-1#PBF uniquely combines pin-selectable gains, 76V common-mode capability, –40°C to +125°C operation, and 20µA shutdown - making it optimal for flexible, high-reliability industrial current sensing where layout reuse and thermal resilience are critical.
Availability
LT1997HMS-1#PBF is available at Aetrix Electronics and suitable for industrial motor drives, solar microinverters, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1997HMS-1#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1997 family was designed specifically for precision, high-voltage current sensing in space-constrained industrial power systems - emphasizing resistor matching integrity, wide common-mode operation, and seamless integration with microcontroller ADCs.
FAQ
What is the maximum common-mode input voltage supported by the LT1997HMS-1#PBF?
The LT1997HMS-1#PBF supports input common-mode voltages from V– to V– + 76V, independent of the V+ supply voltage. This allows direct high-side sensing in 48V, 60V, or telecom power rails without level-shifting circuitry. Operation at V– + 76V is guaranteed with V+ ≥ 3.3V and junction temperature ≤150°C.
How do I configure the LT1997HMS-1#PBF for a gain of 20?
To configure the LT1997HMS-1#PBF for gain = 20, apply the differential input signal between +INB and –INB pins. These pins connect internally to 7.5kΩ resistors, establishing the 20× transfer function. No external components are required. Ensure REF1 and REF2 are properly biased to set the output common-mode level.
Does the LT1997HMS-1#PBF require external resistors for basic operation?
No, the LT1997HMS-1#PBF does not require external resistors for standard difference amplifier operation. All gain-setting resistors (15kΩ, 7.5kΩ, 3kΩ) are monolithically integrated with <1ppm/°C matching. External components are only needed for optional filtering, ESD protection, or reference biasing - not for gain definition or basic functionality.
What is the purpose of the REF1 and REF2 pins on the LT1997HMS-1#PBF?
The REF1 and REF2 pins on the LT1997HMS-1#PBF form a precision reference divider that sets the output DC level when the differential input is zero. By applying appropriate voltages (e.g., mid-supply or ground), they enable output level shifting - critical for interfacing with unipolar ADCs or eliminating output offset in closed-loop systems. This feature is exclusive to the MSOP package (LT1997HMS-1#PBF).
Can the LT1997HMS-1#PBF operate from a single 3.3V supply?
Yes, the LT1997HMS-1#PBF operates from a single 3.3V supply (V+ = 3.3V, V– = 0V), delivering rail-to-rail output swing and specified performance including 650kHz bandwidth (G=10) and 0.012% gain error. Input common-mode range is 0V to 3.325V in this configuration, validated per the datasheet's electrical characteristics table.
LT1997HMS-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 300 kHz
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 350µA
- Current - Output / Channel:
- 34 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 50 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT1997HMS-1#PBF FAQ
1.How can I place an order for LT1997HMS-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1997HMS-1#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 LT1997HMS-1#PBF reliable?
The price and inventory of LT1997HMS-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1997HMS-1#PBF is usually 5 days.
3.What payment methods are accepted for LT1997HMS-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1997HMS-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1997HMS-1#PBF?
LT1997HMS-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1997HMS-1#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 LT1997HMS-1#PBF?
For technical support, including LT1997HMS-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1997HMS-1#PBF requirements.
6.How does Aetrix verify that LT1997HMS-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT1997HMS-1#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 LT1997HMS-1#PBF meets industry standards.
7.What is the process for return or replacement of LT1997HMS-1#PBF?
All LT1997HMS-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1997HMS-1#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 LT1997HMS-1#PBF part is unused and in its original packaging.
Return procedure for LT1997HMS-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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