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Analog Devices Inc. LT1997IDF-3#TRPBF
- Part No.:
- LT1997IDF-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-WFDFN Exposed Pad, 12 Leads
- Datasheet:
-
LT1997IDF-3#TRPBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,618
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Product details
Overview
LT1997IDF-3#TRPBF from Analog Devices is a precision gain-selectable difference amplifier IC integrating matched thin-film resistors and a low-offset op amp in a 14-lead DFN 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 power monitoring systems.
For engineers reviewing the LT1997IDF-3#TRPBF datasheet, LT1997IDF-3#TRPBF pinout, LT1997IDF-3#TRPBF application, or LT1997IDF-3#TRPBF equivalent, this page provides verified specifications, validated pin functions, real-world use cases for bidirectional current sensing and high-voltage front-ends, and two confirmed alternative parts with documented performance trade-offs.
Technical Context
The LT1997IDF-3#TRPBF implements a fully integrated difference amplifier architecture with three noninverting and three inverting input pairs (+INA/–INA, +INB/–INB, +INC/–INC), each connected to precision internal resistors (22.5 kΩ, 7.5 kΩ, 2.5 kΩ) enabling fixed gains of 1, 3, and 9 without external components. Its internal op amp operates over –40°C to +85°C and supports dual supplies from ±1.65 V to ±25 V or single supply from 3.3 V to 50 V.
Gain configuration is determined by external connections to input pins and REF/REF1/REF2 terminals; resistor matching is guaranteed to <1 ppm/°C drift and <2 ppm nonlinearity. The device includes active shutdown (20 µA quiescent) and maintains >81 dB CMRR even at ±160 V common-mode voltage when configured for G = 1 in DF14 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy (G = 1) | ±0.006% max - enables sub-0.1 mV error in 10 V full-scale measurements |
| DC CMRR (G = 1) | ≥91 dB - rejects >10⁴× common-mode interference in high-side current sensing |
| Input Offset Voltage | ±60 µV max - contributes ≤0.6 mV error at 10 V output with G = 1 |
| Supply Range | 3.3 V to 50 V - supports direct interface with 24 V, 48 V, and HV industrial rails |
| Common-Mode Input Range | ±160 V on +INA/–INA - allows direct connection to motor phase or battery terminals |
| Output Swing | Within 100 mV of either rail - delivers full dynamic range into 10 kΩ loads |
| Quiescent Current | 350 µA active / 20 µA shutdown - suitable for always-on and low-power wake-up systems |
Pinout & Package
LT1997IDF-3#TRPBF uses a 14-lead (4 mm × 4 mm) plastic DFN package with exposed thermal pad (Pin 15 = V–). Pin numbering follows top-view orientation per datasheet Rev A; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +INA (Pin 1) | Noninverting Gain-1 Input | Connects internally to 22.5 kΩ resistor; used with –INA for unity-gain difference amplification |
| +INB (Pin 3) | Noninverting Gain-3 Input | Connects to 7.5 kΩ resistor; paired with –INB for 3× differential gain |
| +INC (Pin 5) | Noninverting Gain-9 Input | Connects to 2.5 kΩ resistor; used with –INC for 9× differential gain |
| –INA (Pin 14) | Inverting Gain-1 Input | Internal 22.5 kΩ path; completes G = 1 difference amplifier with +INA |
| –INB (Pin 12) | Inverting Gain-3 Input | Internal 7.5 kΩ path; forms G = 3 stage with +INB |
| –INC (Pin 10) | Inverting Gain-9 Input | Internal 2.5 kΩ path; enables high-gain differential measurement |
| REF (Pin 7) | Reference Input | Sets output DC level when differential input = 0 V; defines common-mode output offset |
| SHDN (Pin 6) | Shutdown Control | Active-low logic input; pulls >2.5 V below V+ to enter 20 µA shutdown mode |
| V+ (Pin 11) | Positive Supply | Accepts up to +50 V; powers internal op amp and resistor network |
| V– (Pin 15, Exposed Pad) | Negative Supply / Thermal Pad | Must be connected to system ground or negative rail; primary thermal path |
| OUT (Pin 8) | Analog Output | Rail-to-rail capable; drives ≥10 kΩ load with <100 mV headroom at ±5 mA |
Key Features
| Feature | Design Value |
|---|---|
| Pin-configurable gain options | Gains of 1, 3, and 9 selected via input pin wiring - eliminates external resistor networks and layout sensitivity |
| Matched resistor network | Thin-film resistors with <1 ppm/°C TC and <2 ppm nonlinearity - ensures stable gain across temperature and signal amplitude |
| High common-mode rejection | 91 dB minimum DC CMRR at G = 1 - enables accurate small-signal extraction from noisy high-voltage buses |
| Rail-to-rail output stage | Swings within 100 mV of V+ and V– - maximizes usable dynamic range in single-supply systems |
| Low-power shutdown mode | Reduces supply current to 20 µA - preserves battery life in portable or intermittent-monitoring applications |
Applications
| High-Side Current Sensing | Bidirectional Wide Common-Mode Current Sensing |
|---|---|
|
Use Scenario: Monitoring motor phase current in a 48 V BLDC inverter where shunt is placed between high-side switch and bus voltage. IC Role / Device Role / Timing Role: Difference amplifier configured at G = 1, referenced to mid-rail, measuring differential voltage across 1 mΩ shunt while rejecting 48 V common-mode. Use Value: ±0.006% gain error ensures ≤60 µV absolute error at 1 V output, enabling ±0.06 A resolution on 10 A full-scale range. |
Use Scenario: Bidirectional battery current monitoring in an EV charging module with ±100 V common-mode range and ±50 A measurement range. IC Role / Device Role / Timing Role: G = 1 difference amplifier using +INA/–INA inputs, REF tied to mid-supply, operating from ±25 V supplies. Use Value: 91 dB CMRR suppresses >10⁴× bus ripple, and ±160 V input range accommodates transient overvoltages without clamping or saturation. |
| Industrial Data-Acquisition Front-End | High-Voltage to Low-Voltage Level Translation |
|
Use Scenario: Signal conditioning for a PLC analog input module accepting ±10 V field signals referenced to chassis ground with ±25 V isolation barrier. IC Role / Device Role / Timing Role: G = 1 difference amplifier isolating field signal common-mode from ADC reference domain; REF set to ADC mid-scale. Use Value: 60 µV max input offset adds <0.0006% FS error; 1.1 MHz bandwidth supports >100 kHz anti-aliasing filter design. |
Use Scenario: Converting ±80 V sensor output (e.g., piezoelectric transducer) to 0–5 V range for microcontroller ADC with 3.3 V supply. IC Role / Device Role / Timing Role: G = 1 difference amplifier with REF biased at 2.5 V, powered from 5 V single supply, using +INA/–INA inputs. Use Value: ±160 V input range safely handles 80 V signals; rail-to-rail output delivers full 0–5 V span without external level-shifting circuitry. |
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 min CMRR, ±320 V input range, 1.5 mA IQ | Higher input voltage rating but lower CMRR and higher power; no gain flexibility | Choose AD8479ARZ only when ±320 V operation is required and 80 dB CMRR suffices |
| INA149AIDR | Fixed G = 1, 100 dB min CMRR, ±270 V input range, 1.2 mA IQ | Superior CMRR and wider input range, but no multi-gain option and larger SOIC-8 footprint | Prefer INA149AIDR for ultra-high CMRR needs in space-tolerant designs; not pin-compatible |
Compared with LT1997IDF-3#TRPBF, AD8479ARZ trades gain configurability and low power for extended input voltage range, while INA149AIDR offers higher CMRR and voltage rating at the cost of fixed gain and larger package - making LT1997IDF-3#TRPBF optimal for compact, multi-gain, low-power industrial front-ends.
Availability
LT1997IDF-3#TRPBF is available at Aetrix Electronics and suitable for industrial data-acquisition front-ends, high-side current sensing in motor drives, and high-voltage level translation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1997IDF-3#TRPBF 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 since 1965.
The LT1997-3 product line delivers precision, wide common-mode difference amplifiers with integrated resistor networks - designed specifically for high-accuracy current sensing, isolated signal conditioning, and robust industrial measurement front-ends.
FAQ
What is the maximum common-mode input voltage supported by the LT1997IDF-3#TRPBF?
The LT1997IDF-3#TRPBF supports ±160 V common-mode voltage on the +INA and –INA pins, verified per Absolute Maximum Ratings and Electrical Characteristics tables. This applies when configured as a difference amplifier at G = 1 with appropriate supply voltages (e.g., ±25 V). Operation beyond ±160 V risks permanent damage and is not guaranteed.
Can the LT1997IDF-3#TRPBF be used with a single 5 V supply?
Yes, the LT1997IDF-3#TRPBF operates from a single 5 V supply (V+ = 5 V, V– = 0 V), as confirmed in the Electrical Characteristics tables (TA = 25°C and –40°C to +85°C). Output swings to within 100 mV of each rail, and REF can be biased at 2.5 V to enable true bipolar input measurement relative to mid-supply.
How does gain selection work on the LT1997IDF-3#TRPBF without external resistors?
Gain selection on the LT1997IDF-3#TRPBF is achieved by connecting specific input pins: +INA/–INA for G = 1 (22.5 kΩ internal resistors), +INB/–INB for G = 3 (7.5 kΩ), or +INC/–INC for G = 9 (2.5 kΩ). No external resistors are needed - the matched thin-film network is monolithically integrated and laser-trimmed during manufacturing.
What is the shutdown current of the LT1997IDF-3#TRPBF and how is it activated?
The LT1997IDF-3#TRPBF draws 20 µA in shutdown mode, activated when the SHDN pin is pulled >2.5 V below V+. In active mode (SHDN ≥ V+ – 1.2 V), supply current is 350 µA typical. The shutdown function is fully specified across –40°C to +85°C and requires no external timing components.
Is the LT1997IDF-3#TRPBF pin-compatible with other packages in the LT1997-3 family?
No - the LT1997IDF-3#TRPBF uses a 14-lead DFN package with exposed thermal pad (Pin 15 = V–), while the MSOP variant (e.g., LT1997IMS-3#TRPBF) uses a 16-lead MSOP with different pin count and layout. Pin functions differ between packages; for example, REF1/REF2 appear only in MSOP, and DFN lacks dedicated REF1/REF2 pins. Board redesign is required for package interchange.
LT1997IDF-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad, 12 Leads
- Packaging:
- Tape & Reel (TR)
- 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:
- -
- 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:
- 14-DFN (4x4)
LT1997IDF-3#TRPBF FAQ
1.How can I place an order for LT1997IDF-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1997IDF-3#TRPBF 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 LT1997IDF-3#TRPBF reliable?
The price and inventory of LT1997IDF-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1997IDF-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1997IDF-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1997IDF-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1997IDF-3#TRPBF?
LT1997IDF-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1997IDF-3#TRPBF 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 LT1997IDF-3#TRPBF?
For technical support, including LT1997IDF-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1997IDF-3#TRPBF requirements.
6.How does Aetrix verify that LT1997IDF-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1997IDF-3#TRPBF 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 LT1997IDF-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1997IDF-3#TRPBF?
All LT1997IDF-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1997IDF-3#TRPBF, 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 LT1997IDF-3#TRPBF part is unused and in its original packaging.
Return procedure for LT1997IDF-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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