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Analog Devices Inc. LT1997IMS-3#PBF
- Part No.:
- LT1997IMS-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT1997IMS-3#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:444
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Product details
Overview
LT1997IMS-3#PBF from Analog Devices is a precision gain-selectable difference amplifier IC integrating matched thin-film resistors and a low-offset op amp in a 16-lead MSOP package. It delivers ±0.006% (60 ppm) gain error at G = 1, 91 dB DC CMRR, ±160 V common-mode input range, and rail-to-rail output swing - enabling high-accuracy current sensing and level translation in industrial data-acquisition front-ends.
For engineers reviewing the LT1997IMS-3#PBF datasheet, LT1997IMS-3#PBF pinout, LT1997IMS-3#PBF application, or LT1997IMS-3#PBF equivalent, key selection criteria include guaranteed 1 ppm/°C gain drift, shutdown current of 20 µA, 350 µA active supply current, and compatibility with 3.3 V to 50 V dual or single supplies across –40°C to +85°C.
Technical Context
The LT1997IMS-3#PBF implements a fully integrated difference amplifier architecture with three noninverting (+INA/+INB/+INC) and three inverting (–INA/–INB/–INC) input terminals, each connected to precision internal resistors (22.5 kΩ, 7.5 kΩ, 2.5 kΩ) enabling fixed gains of 1, 3, or 9 without external components. Its internal op amp operates in normal mode for VCMOP between V– and V+ – 1.75 V, or Over-The-Top® mode up to V– + 76 V.
Gain configuration is determined by external connections: selecting +INA/–INA yields G = 1; +INB/–INB yields G = 3; +INC/–INC yields G = 9. The REF pin sets output offset, while SHDN enables low-power shutdown (20 µA), and the exposed V– pad on the MSOP package ensures thermal performance with θJA = 130°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy | ±0.006% max at G = 1 - enables sub-100 ppm system-level measurement accuracy without trimming |
| CMRR | 91 dB min (DC, G = 1) - rejects >99.99% of common-mode voltage in high-side current sensing |
| Input Offset Voltage | 60 µV max - contributes ≤0.6 mV output error at G = 10, critical for low-level signal amplification |
| Supply Range | 3.3 V to 50 V - supports direct interface with 24 V industrial buses and ±15 V legacy systems |
| Output Swing | Within 100 mV of rails - delivers full dynamic range into 10 kΩ loads without headroom loss |
| Quiescent Current | 350 µA active / 20 µA shutdown - enables always-on monitoring with battery-backed operation |
| Operating Temp | –40°C to +85°C - qualified for commercial/industrial environments without derating |
Pinout & Package
LT1997IMS-3#PBF is housed in a 16-lead plastic MSOP (MS16) package with exposed pad tied to V–. Pin 1 is +INA; pin 3 is +INB; pin 5 is +INC; pin 8 is V–; pin 9 is V+; pin 10 is SHDN; pin 12 is –INC; pin 14 is –INB; pin 16 is –INA; pins 6 and 7 are REF1 and REF2; pin 11 is OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +INA (Pin 1) | Noninverting Input (G = 1) | Connects to 22.5 kΩ resistor; configures unity-gain difference amplifier |
| +INB (Pin 3) | Noninverting Input (G = 3) | Connects to 7.5 kΩ resistor; enables 3× gain with matched ratio |
| +INC (Pin 5) | Noninverting Input (G = 9) | Connects to 2.5 kΩ resistor; provides 9× gain with <2 ppm nonlinearity |
| –INA (Pin 16) | Inverting Input (G = 1) | Matches +INA path; ensures >91 dB CMRR via laser-trimmed resistor matching |
| –INB (Pin 14) | Inverting Input (G = 3) | Matches +INB path; maintains 1 ppm/°C gain drift over temperature |
| –INC (Pin 12) | Inverting Input (G = 9) | Matches +INC path; supports high-common-mode bidirectional current sensing |
| V+ (Pin 9) | Positive Supply | Accepts up to 60 V differential vs V–; powers internal op amp and reference network |
| V– (Pin 8) | Negative Supply | Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity |
| OUT (Pin 11) | Amplifier Output | Rail-to-rail capable; drives 10 kΩ load with <100 mV saturation margin |
| SHDN (Pin 10) | Shutdown Control | Active-high logic: ≥V+ – 1.2 V enables; ≤V+ – 2.5 V reduces current to 20 µA |
| REF1/REF2 (Pins 6/7) | Reference Divider Inputs | Set zero-difference output level; enable precise offset calibration in sensor interfaces |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Precision Resistor Network | Laser-trimmed 22.5 kΩ/7.5 kΩ/2.5 kΩ ratios enable G = 1/3/9 without external components or layout sensitivity |
| Over-The-Top® Input Operation | Supports VCM up to ±160 V on +INA/–INA pins while maintaining functionality beyond standard op amp limits |
| Ultra-Low Gain Drift | 1 ppm/°C max ensures stable gain across industrial temperature range - eliminates recalibration in field-deployed systems |
| Low-Power Shutdown Mode | 20 µA quiescent current allows energy-efficient wake-on-event architectures in battery-powered instrumentation |
| High Common-Mode Rejection | 91 dB DC CMRR at G = 1 directly enables accurate shunt-based current measurement in noisy motor drive environments |
Applications
| High-Side Current Sensing | Bidirectional Wide Common-Mode Current Sensing |
|---|---|
Use Scenario: Monitoring motor phase current in 48 V EV traction inverters using a 1 mΩ shunt placed between battery positive and IGBT bridge. IC Role / Device Role / Timing Role: Difference amplifier configured at G = 100 (via external scaling) to convert differential shunt voltage into ground-referenced output. Use Value: ±160 V common-mode range accommodates full battery voltage swing; 60 µV offset ensures <0.1 A error at 100 A full scale. | Use Scenario: Measuring bidirectional current in a 24 V telecom power supply with ±30 A range and shared ground with control circuitry. IC Role / Device Role / Timing Role: G = 3 difference amplifier referenced to mid-supply, rejecting noise from switching regulators. Use Value: 91 dB CMRR suppresses 100 kHz switching noise; rail-to-rail output interfaces directly with 12-bit SAR ADC. |
| Industrial Data-Acquisition Front-Ends | High-Voltage to Low-Voltage Level Translation |
Use Scenario: Conditioning signals from strain gauges and RTDs in PLC analog input modules operating from 24 V DC bus. IC Role / Device Role / Timing Role: Precision gain-of-1 amplifier with REF pin tied to ADC reference to eliminate offset drift errors. Use Value: 0.006% gain error and 1 ppm/°C drift meet Class A metrology requirements per IEC 61000-4-30. | Use Scenario: Isolating feedback signals from 380 V AC rectified bus to 3.3 V microcontroller ADC in solar inverter DC-link monitoring. IC Role / Device Role / Timing Role: G = 1 difference amplifier with scaled resistor network to attenuate high-voltage sense signal. Use Value: Eliminates optocoupler and isolated DC/DC converter; ±160 V input range covers full rectified waveform peaks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8479ARZ | Fixed G = 1, 80 dB CMRR, ±100 V common-mode, no shutdown, SOIC-8 | Lacks gain flexibility and low-power mode; suited only for unidirectional high-CMRR sensing | Select AD8479ARZ when absolute minimum board area and cost are prioritized over programmability and power savings |
| INA240A1D | Fixed G = 20, 120 dB CMRR, ±80 V common-mode, 2.1 MHz BW, SOIC-8 | Higher bandwidth but narrower common-mode range; optimized for motor current loop control | Select INA240A1D when fast transient response is required and common-mode stays within ±80 V |
Compared with AD8479ARZ and INA240A1D, the LT1997IMS-3#PBF uniquely combines selectable gain (1/3/9), ±160 V common-mode capability, and 20 µA shutdown - making it optimal for flexible, wide-range, low-power industrial sensing where layout space and thermal management are constrained.
Availability
LT1997IMS-3#PBF is available at Aetrix Electronics and suitable for high-side current sensing, industrial data-acquisition front-ends, and high-voltage level translation requiring stable component supply and long-term manufacturability.
Supply support for LT1997IMS-3#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1997-3 product line delivers precision, wide-supply, gain-configurable difference amplifiers designed for high-accuracy current sensing and signal conditioning in harsh industrial environments.
FAQ
What is the maximum common-mode input voltage supported by the LT1997IMS-3#PBF?
The LT1997IMS-3#PBF supports ±160 V common-mode voltage on the +INA and –INA pins when referenced to V–, verified per Absolute Maximum Ratings and confirmed in the Electrical Characteristics table for the MS16 package. This enables direct interfacing with 400 V DC bus systems without external attenuation or isolation.
Can the LT1997IMS-3#PBF operate from a single 5 V supply?
Yes, the LT1997IMS-3#PBF is fully specified down to 3.3 V total supply (V+ to V–), including operation from a 5 V single supply (V+ = 5 V, V– = 0 V). Performance metrics such as gain error (±0.006%), CMRR (90 dB), and output swing (within 15 mV of rails) are guaranteed across this condition per the Electrical Characteristics tables.
How does the SHDN pin function on the LT1997IMS-3#PBF?
The SHDN pin on the LT1997IMS-3#PBF is an active-high control: the device operates normally when SHDN ≥ V+ – 1.2 V (or left floating), and enters low-power shutdown drawing 20 µA when SHDN ≤ V+ – 2.5 V. This enables rapid power cycling in portable or energy-sensitive applications without external sequencing.
What is the guaranteed gain error drift over temperature for the LT1997IMS-3#PBF?
The LT1997IMS-3#PBF guarantees ±1 ppm/°C maximum gain error drift over the full –40°C to +85°C operating range, as specified in the Electrical Characteristics table under ∆G/∆T. This stability is achieved through laser-trimmed thin-film resistors with matched temperature coefficients, ensuring minimal calibration drift in field-deployed equipment.
Which package variant does the LT1997IMS-3#PBF use, and what are its thermal characteristics?
The LT1997IMS-3#PBF uses the 16-lead plastic MSOP (MS16) package with exposed V– pad. Its thermal resistance is θJA = 130°C/W (no heatsink), and the exposed pad must be soldered to a PCB copper plane for effective heat dissipation and electrical grounding, as stated in the Absolute Maximum Ratings and Pin Configuration sections.
LT1997IMS-3#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:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.75V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.1 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 350µA
- Current - Output / Channel:
- 28 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 50 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT1997IMS-3#PBF FAQ
1.How can I place an order for LT1997IMS-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1997IMS-3#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 LT1997IMS-3#PBF reliable?
The price and inventory of LT1997IMS-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1997IMS-3#PBF is usually 5 days.
3.What payment methods are accepted for LT1997IMS-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1997IMS-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1997IMS-3#PBF?
LT1997IMS-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1997IMS-3#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 LT1997IMS-3#PBF?
For technical support, including LT1997IMS-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1997IMS-3#PBF requirements.
6.How does Aetrix verify that LT1997IMS-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT1997IMS-3#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 LT1997IMS-3#PBF meets industry standards.
7.What is the process for return or replacement of LT1997IMS-3#PBF?
All LT1997IMS-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1997IMS-3#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 LT1997IMS-3#PBF part is unused and in its original packaging.
Return procedure for LT1997IMS-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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